/**
* libcoopgamma -- Library for interfacing with cooperative gamma servers
* Copyright (C) 2016 Mattias Andrée (maandree@kth.se)
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "libcoopgamma.h"
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if defined(__clang__)
# pragma GCC diagnostic ignored "-Wdocumentation"
# pragma GCC diagnostic ignored "-Wcovered-switch-default"
# pragma GCC diagnostic ignored "-Wcast-align"
#endif
#if defined(__GNUC__)
# define NAME_OF_THE_PROCESS (argv0)
extern const char* argv0;
const char* argv0 __attribute__((weak)) = "libcoopgamma";
#else
# define NAME_OF_THE_PROCESS ("libcoopgamma")
#endif
#define SUBBUF \
(buf ? buf + off : NULL)
#define NNSUBBUF \
(buf + off)
#define MARSHAL_PROLOGUE \
char* restrict buf = vbuf; \
size_t off = 0;
#define UNMARSHAL_PROLOGUE \
const char* restrict buf = vbuf; \
size_t off = 0;
#define MARSHAL_EPILOGUE \
return off
#define UNMARSHAL_EPILOGUE \
return *np = off, LIBCOOPGAMMA_SUCCESS
#define marshal_prim(datum, type) \
((buf != NULL ? *(type*)(buf + off) = (datum) : 0), off += sizeof(type))
#define unmarshal_prim(datum, type) \
((datum) = *(const type*)(buf + off), off += sizeof(type))
#define marshal_version(version) \
marshal_prim(version, int)
#define unmarshal_version(version) \
do \
{ \
int version__; \
unmarshal_prim(version__, int); \
if (version__ < version) \
return LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE; \
if (version__ > version) \
return LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE; \
} \
while (0)
#define marshal_buffer(data, n) \
((buf != NULL ? (memcpy(buf + off, (data), (n)), 0) : 0), off += (n))
#define unmarshal_buffer(data, n) \
do \
{ \
(data) = malloc(n); \
if ((data) == NULL) \
return LIBCOOPGAMMA_ERRNO_SET; \
memcpy((data), buf + off, (n)); \
off += (n); \
} \
while (0)
#define marshal_string(datum) \
((datum) == NULL ? marshal_prim(1, char) : \
(marshal_prim(0, char), marshal_buffer(datum, strlen(datum) + 1)))
#define unmarshal_string(datum) \
do \
{ \
char nonnull__; \
unmarshal_prim(nonnull__, char); \
if (nonnull__) \
unmarshal_buffer((datum), strlen(buf + off) + 1); \
else \
(datum) = NULL; \
} \
while (0)
#define copy_errno(ctx) \
((errno == 0) ? NULL : \
((ctx)->error.number = (uint64_t)errno, \
(ctx)->error.custom = 0, \
(ctx)->error.server_side = 0, \
free((ctx)->error.description), \
(ctx)->error.description = NULL))
#define SYNC_CALL(send_call, recv_call, fail_return) \
libcoopgamma_async_context_t async; \
size_t _selected; \
if (send_call < 0) \
{ \
reflush: \
if (errno != EINTR) \
return fail_return; \
if (libcoopgamma_flush(ctx) < 0) \
goto reflush; \
} \
resync: \
switch (libcoopgamma_synchronise(ctx, &async, (size_t)1, &_selected)) \
{ \
default: \
break; \
case -1: \
if (errno != EINTR) \
return fail_return; \
/* Fall through */ \
case -2: \
goto resync; \
} \
return recv_call
#define INTEGRAL_DEPTHS \
case LIBCOOPGAMMA_UINT8: \
case LIBCOOPGAMMA_UINT16: \
case LIBCOOPGAMMA_UINT32: \
case LIBCOOPGAMMA_UINT64:
/**
* Initialise a `libcoopgamma_ramps8_t`, `libcoopgamma_ramps16_t`, `libcoopgamma_ramps32_t`,
* `libcoopgamma_ramps64_t`, `libcoopgamma_rampsf_t`, or `libcoopgamma_rampsd_t`
*
* `this->red_size`, `this->green_size`, and `this->blue_size` must already be set
*
* @param this The record to initialise
* @param width The `sizeof(*(this->red))`
* @return Zero on success, -1 on error
*/
int libcoopgamma_ramps_initialise_(void* restrict this, size_t width)
{
libcoopgamma_ramps8_t* restrict this8 = (libcoopgamma_ramps8_t* restrict)this;
this8->red = this8->green = this8->blue = NULL;
this8->red = malloc((this8->red_size + this8->green_size + this8->blue_size) * width);
if (this8->red == NULL)
return -1;
this8->green = this8->red + this8->red_size * width;
this8->blue = this8->green + this8->green_size * width;
return 0;
}
/**
* Release all resources allocated to a `libcoopgamma_ramps8_t`, `libcoopgamma_ramps16_t`,
* `libcoopgamma_ramps32_t`, `libcoopgamma_ramps64_t`, `libcoopgamma_rampsf_t`,
* `libcoopgamma_rampsd_t`, or `libcoopgamma_ramps_t`, the allocation of the record
* itself is not freed
*
* Always call this function after failed call to `libcoopgamma_ramps_initialise`
* or failed call to `libcoopgamma_ramps_unmarshal`
*
* @param this The record to destroy
*/
void libcoopgamma_ramps_destroy(void* restrict this)
{
libcoopgamma_ramps8_t* restrict this8 = (libcoopgamma_ramps8_t* restrict)this;
free(this8->red);
this8->red = this8->green = this8->blue = NULL;
}
/**
* Marshal a `libcoopgamma_ramps8_t`, `libcoopgamma_ramps16_t`, `libcoopgamma_ramps32_t`,
* `libcoopgamma_ramps64_t`, `libcoopgamma_rampsf_t`, or `libcoopgamma_rampsd_t` into a buffer
*
* @param this The record to marshal
* @param vbuf The output buffer, `NULL` to only measure
* how large this buffer has to be
* @param width The `sizeof(*(this->red))`
* @return The number of marshalled bytes, or if `buf == NULL`,
* how many bytes would be marshalled if `buf != NULL`
*/
size_t libcoopgamma_ramps_marshal_(const void* restrict this, void* restrict vbuf, size_t width)
{
const libcoopgamma_ramps8_t* restrict this8 = (const libcoopgamma_ramps8_t* restrict)this;
MARSHAL_PROLOGUE;
marshal_version(LIBCOOPGAMMA_RAMPS_VERSION);
marshal_prim(this8->red_size, size_t);
marshal_prim(this8->green_size, size_t);
marshal_prim(this8->blue_size, size_t);
marshal_buffer(this8->red, (this8->red_size + this8->green_size + this8->blue_size) * width);
MARSHAL_EPILOGUE;
}
/**
* Unmarshal a `libcoopgamma_ramps8_t`, `libcoopgamma_ramps16_t`, `libcoopgamma_ramps32_t`,
* `libcoopgamma_ramps64_t`, `libcoopgamma_rampsf_t`, or `libcoopgamma_rampsd_t` from a buffer
*
* @param this The output paramater for unmarshalled record
* @param vbuf The buffer with the marshalled record
* @param np Output parameter for the number of unmarshalled bytes, undefined on failure
* @param width The `sizeof(*(this->red))`
* @return `LIBCOOPGAMMA_SUCCESS` (0), `LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE`,
* `LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE`, or `LIBCOOPGAMMA_ERRNO_SET`
*/
int libcoopgamma_ramps_unmarshal_(void* restrict this, const void* restrict vbuf,
size_t* restrict np, size_t width)
{
libcoopgamma_ramps8_t* restrict this8 = (libcoopgamma_ramps8_t* restrict)this;
UNMARSHAL_PROLOGUE;
unmarshal_version(LIBCOOPGAMMA_RAMPS_VERSION);
unmarshal_prim(this8->red_size, size_t);
unmarshal_prim(this8->green_size, size_t);
unmarshal_prim(this8->blue_size, size_t);
unmarshal_buffer(this8->red, (this8->red_size + this8->green_size + this8->blue_size) * width);
UNMARSHAL_EPILOGUE;
}
/**
* Initialise a `libcoopgamma_filter_t`
*
* @param this The record to initialise
* @return Zero on success, -1 on error
*/
int libcoopgamma_filter_initialise(libcoopgamma_filter_t* restrict this)
{
memset(this, 0, sizeof(*this));
return 0;
}
/**
* Release all resources allocated to a `libcoopgamma_filter_t`,
* the allocation of the record itself is not freed
*
* Always call this function after failed call to `libcoopgamma_filter_initialise`
* or failed call to `libcoopgamma_filter_unmarshal`
*
* @param this The record to destroy
*/
void libcoopgamma_filter_destroy(libcoopgamma_filter_t* restrict this)
{
free(this->crtc);
free(this->class);
free(this->ramps.u8.red);
memset(this, 0, sizeof(*this));
}
/**
* Marshal a `libcoopgamma_filter_t` into a buffer
*
* @param this The record to marshal
* @param vbuf The output buffer, `NULL` to only measure
* how large this buffer has to be
* @return The number of marshalled bytes, or if `buf == NULL`,
* how many bytes would be marshalled if `buf != NULL`
*/
size_t libcoopgamma_filter_marshal(const libcoopgamma_filter_t* restrict this, void* restrict vbuf)
{
MARSHAL_PROLOGUE;
marshal_version(LIBCOOPGAMMA_FILTER_VERSION);
marshal_version(LIBCOOPGAMMA_DEPTH_VERSION);
marshal_version(LIBCOOPGAMMA_LIFESPAN_VERSION);
marshal_prim(this->depth, libcoopgamma_depth_t);
marshal_prim(this->priority, int64_t);
marshal_string(this->crtc);
marshal_string(this->class);
marshal_prim(this->lifespan, libcoopgamma_lifespan_t);
switch (this->depth)
{
case LIBCOOPGAMMA_UINT8: off += libcoopgamma_ramps_marshal(&(this->ramps.u8), SUBBUF); break;
case LIBCOOPGAMMA_UINT16: off += libcoopgamma_ramps_marshal(&(this->ramps.u16), SUBBUF); break;
case LIBCOOPGAMMA_UINT32: off += libcoopgamma_ramps_marshal(&(this->ramps.u32), SUBBUF); break;
case LIBCOOPGAMMA_UINT64: off += libcoopgamma_ramps_marshal(&(this->ramps.u64), SUBBUF); break;
case LIBCOOPGAMMA_FLOAT: off += libcoopgamma_ramps_marshal(&(this->ramps.f), SUBBUF); break;
case LIBCOOPGAMMA_DOUBLE: off += libcoopgamma_ramps_marshal(&(this->ramps.d), SUBBUF); break;
default:
break;
}
MARSHAL_EPILOGUE;
}
/**
* Unmarshal a `libcoopgamma_filter_t` from a buffer
*
* @param this The output paramater for unmarshalled record
* @param vbuf The buffer with the marshalled record
* @param np Output parameter for the number of unmarshalled bytes, undefined on failure
* @return `LIBCOOPGAMMA_SUCCESS` (0), `LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE`,
* `LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE`, or `LIBCOOPGAMMA_ERRNO_SET`
*/
int libcoopgamma_filter_unmarshal(libcoopgamma_filter_t* restrict this,
const void* restrict vbuf, size_t* restrict np)
{
int r = LIBCOOPGAMMA_SUCCESS;
size_t n = 0;
UNMARSHAL_PROLOGUE;
memset(this, 0, sizeof(*this));
unmarshal_version(LIBCOOPGAMMA_FILTER_VERSION);
unmarshal_version(LIBCOOPGAMMA_DEPTH_VERSION);
unmarshal_version(LIBCOOPGAMMA_LIFESPAN_VERSION);
unmarshal_prim(this->depth, libcoopgamma_depth_t);
unmarshal_prim(this->priority, int64_t);
unmarshal_string(this->crtc);
unmarshal_string(this->class);
unmarshal_prim(this->lifespan, libcoopgamma_lifespan_t);
switch (this->depth)
{
case LIBCOOPGAMMA_UINT8: r = libcoopgamma_ramps_unmarshal(&(this->ramps.u8), NNSUBBUF, &n); break;
case LIBCOOPGAMMA_UINT16: r = libcoopgamma_ramps_unmarshal(&(this->ramps.u16), NNSUBBUF, &n); break;
case LIBCOOPGAMMA_UINT32: r = libcoopgamma_ramps_unmarshal(&(this->ramps.u32), NNSUBBUF, &n); break;
case LIBCOOPGAMMA_UINT64: r = libcoopgamma_ramps_unmarshal(&(this->ramps.u64), NNSUBBUF, &n); break;
case LIBCOOPGAMMA_FLOAT: r = libcoopgamma_ramps_unmarshal(&(this->ramps.f), NNSUBBUF, &n); break;
case LIBCOOPGAMMA_DOUBLE: r = libcoopgamma_ramps_unmarshal(&(this->ramps.d), NNSUBBUF, &n); break;
default:
break;
}
if (r != LIBCOOPGAMMA_SUCCESS)
return r;
off += n;
UNMARSHAL_EPILOGUE;
}
/**
* Initialise a `libcoopgamma_crtc_info_t`
*
* @param this The record to initialise
* @return Zero on success, -1 on error
*/
int libcoopgamma_crtc_info_initialise(libcoopgamma_crtc_info_t* restrict this)
{
memset(this, 0, sizeof(*this));
return 0;
}
/**
* Release all resources allocated to a `libcoopgamma_crtc_info_t`,
* the allocation of the record itself is not freed
*
* Always call this function after failed call to `libcoopgamma_crtc_info_initialise`
* or failed call to `libcoopgamma_crtc_info_unmarshal`
*
* @param this The record to destroy
*/
#if defined(__GNUC__)
__attribute__((__const__))
#endif
void libcoopgamma_crtc_info_destroy(libcoopgamma_crtc_info_t* restrict this)
{
(void) this;
}
/**
* Marshal a `libcoopgamma_crtc_info_t` into a buffer
*
* @param this The record to marshal
* @param vbuf The output buffer, `NULL` to only measure
* how large this buffer has to be
* @return The number of marshalled bytes, or if `buf == NULL`,
* how many bytes would be marshalled if `buf != NULL`
*/
size_t libcoopgamma_crtc_info_marshal(const libcoopgamma_crtc_info_t* restrict this, void* restrict vbuf)
{
MARSHAL_PROLOGUE;
marshal_version(LIBCOOPGAMMA_CRTC_INFO_VERSION);
marshal_version(LIBCOOPGAMMA_DEPTH_VERSION);
marshal_version(LIBCOOPGAMMA_SUPPORT_VERSION);
marshal_prim(this->cooperative, int);
marshal_prim(this->depth, libcoopgamma_depth_t);
marshal_prim(this->red_size, size_t);
marshal_prim(this->green_size, size_t);
marshal_prim(this->blue_size, size_t);
marshal_prim(this->supported, libcoopgamma_support_t);
MARSHAL_EPILOGUE;
}
/**
* Unmarshal a `libcoopgamma_crtc_info_t` from a buffer
*
* @param this The output paramater for unmarshalled record
* @param vbuf The buffer with the marshalled record
* @param np Output parameter for the number of unmarshalled bytes, undefined on failure
* @return `LIBCOOPGAMMA_SUCCESS` (0), `LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE`,
* `LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE`, or `LIBCOOPGAMMA_ERRNO_SET`
*/
int libcoopgamma_crtc_info_unmarshal(libcoopgamma_crtc_info_t* restrict this,
const void* restrict vbuf, size_t* restrict np)
{
UNMARSHAL_PROLOGUE;
unmarshal_version(LIBCOOPGAMMA_CRTC_INFO_VERSION);
unmarshal_version(LIBCOOPGAMMA_DEPTH_VERSION);
unmarshal_version(LIBCOOPGAMMA_SUPPORT_VERSION);
unmarshal_prim(this->cooperative, int);
unmarshal_prim(this->depth, libcoopgamma_depth_t);
unmarshal_prim(this->red_size, size_t);
unmarshal_prim(this->green_size, size_t);
unmarshal_prim(this->blue_size, size_t);
unmarshal_prim(this->supported, libcoopgamma_support_t);
UNMARSHAL_EPILOGUE;
}
/**
* Initialise a `libcoopgamma_filter_query_t`
*
* @param this The record to initialise
* @return Zero on success, -1 on error
*/
int libcoopgamma_filter_query_initialise(libcoopgamma_filter_query_t* restrict this)
{
this->crtc = NULL;
this->coalesce = 0;
this->high_priority = INT64_MAX;
this->low_priority = INT64_MIN;
return 0;
}
/**
* Release all resources allocated to a `libcoopgamma_filter_query_t`,
* the allocation of the record itself is not freed
*
* Always call this function after failed call to `libcoopgamma_filter_query_initialise`
* or failed call to `libcoopgamma_filter_query_unmarshal`
*
* @param this The record to destroy
*/
void libcoopgamma_filter_query_destroy(libcoopgamma_filter_query_t* restrict this)
{
free(this->crtc), this->crtc = NULL;
}
/**
* Marshal a `libcoopgamma_filter_query_t` into a buffer
*
* @param this The record to marshal
* @param vbuf The output buffer, `NULL` to only measure
* how large this buffer has to be
* @return The number of marshalled bytes, or if `buf == NULL`,
* how many bytes would be marshalled if `buf != NULL`
*/
size_t libcoopgamma_filter_query_marshal(const libcoopgamma_filter_query_t* restrict this, void* restrict vbuf)
{
MARSHAL_PROLOGUE;
marshal_version(LIBCOOPGAMMA_FILTER_QUERY_VERSION);
marshal_string(this->crtc);
marshal_prim(this->coalesce, int);
marshal_prim(this->high_priority, int64_t);
marshal_prim(this->low_priority, int64_t);
MARSHAL_EPILOGUE;
}
/**
* Unmarshal a `libcoopgamma_filter_query_t` from a buffer
*
* @param this The output paramater for unmarshalled record
* @param vbuf The buffer with the marshalled record
* @param np Output parameter for the number of unmarshalled bytes, undefined on failure
* @return `LIBCOOPGAMMA_SUCCESS` (0), `LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE`,
* `LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE`, or `LIBCOOPGAMMA_ERRNO_SET`
*/
int libcoopgamma_filter_query_unmarshal(libcoopgamma_filter_query_t* restrict this,
const void* restrict vbuf, size_t* restrict np)
{
UNMARSHAL_PROLOGUE;
this->crtc = NULL;
unmarshal_version(LIBCOOPGAMMA_FILTER_QUERY_VERSION);
unmarshal_string(this->crtc);
unmarshal_prim(this->coalesce, int);
unmarshal_prim(this->high_priority, int64_t);
unmarshal_prim(this->low_priority, int64_t);
UNMARSHAL_EPILOGUE;
}
/**
* Initialise a `libcoopgamma_queried_filter_t`
*
* @param this The record to initialise
* @return Zero on success, -1 on error
*/
int libcoopgamma_queried_filter_initialise(libcoopgamma_queried_filter_t* restrict this)
{
memset(this, 0, sizeof(*this));
return 0;
}
/**
* Release all resources allocated to a `libcoopgamma_queried_filter_t`,
* the allocation of the record itself is not freed
*
* Always call this function after failed call to `libcoopgamma_queried_filter_initialise`
* or failed call to `libcoopgamma_queried_filter_unmarshal`
*
* @param this The record to destroy
*/
void libcoopgamma_queried_filter_destroy(libcoopgamma_queried_filter_t* restrict this)
{
free(this->class), this->class = NULL;
libcoopgamma_ramps_destroy(&(this->ramps.u8));
}
/**
* Marshal a `libcoopgamma_queried_filter_t` into a buffer
*
* @param this The record to marshal
* @param vbuf The output buffer, `NULL` to only measure
* how large this buffer has to be
* @param depth The type used of ramp stops
* @return The number of marshalled bytes, or if `buf == NULL`,
* how many bytes would be marshalled if `buf != NULL`
*/
size_t libcoopgamma_queried_filter_marshal(const libcoopgamma_queried_filter_t* restrict this,
void* restrict vbuf, libcoopgamma_depth_t depth)
{
MARSHAL_PROLOGUE;
marshal_version(LIBCOOPGAMMA_QUERIED_FILTER_VERSION);
marshal_prim(this->priority, int64_t);
marshal_string(this->class);
switch (depth)
{
case LIBCOOPGAMMA_UINT8: off += libcoopgamma_ramps_marshal(&(this->ramps.u8), SUBBUF); break;
case LIBCOOPGAMMA_UINT16: off += libcoopgamma_ramps_marshal(&(this->ramps.u16), SUBBUF); break;
case LIBCOOPGAMMA_UINT32: off += libcoopgamma_ramps_marshal(&(this->ramps.u32), SUBBUF); break;
case LIBCOOPGAMMA_UINT64: off += libcoopgamma_ramps_marshal(&(this->ramps.u64), SUBBUF); break;
case LIBCOOPGAMMA_FLOAT: off += libcoopgamma_ramps_marshal(&(this->ramps.f), SUBBUF); break;
case LIBCOOPGAMMA_DOUBLE: off += libcoopgamma_ramps_marshal(&(this->ramps.d), SUBBUF); break;
default:
break;
}
MARSHAL_EPILOGUE;
}
/**
* Unmarshal a `libcoopgamma_queried_filter_t` from a buffer
*
* @param this The output paramater for unmarshalled record
* @param vbuf The buffer with the marshalled record
* @param np Output parameter for the number of unmarshalled bytes, undefined on failure
* @param depth The type used of ramp stops
* @return `LIBCOOPGAMMA_SUCCESS` (0), `LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE`,
* `LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE`, or `LIBCOOPGAMMA_ERRNO_SET`
*/
int libcoopgamma_queried_filter_unmarshal(libcoopgamma_queried_filter_t* restrict this,
const void* restrict vbuf, size_t* restrict np,
libcoopgamma_depth_t depth)
{
int r = LIBCOOPGAMMA_SUCCESS;
size_t n = 0;
UNMARSHAL_PROLOGUE;
memset(this, 0, sizeof(*this));
unmarshal_version(LIBCOOPGAMMA_QUERIED_FILTER_VERSION);
unmarshal_prim(this->priority, int64_t);
unmarshal_string(this->class);
switch (depth)
{
case LIBCOOPGAMMA_UINT8: r = libcoopgamma_ramps_unmarshal(&(this->ramps.u8), NNSUBBUF, &n); break;
case LIBCOOPGAMMA_UINT16: r = libcoopgamma_ramps_unmarshal(&(this->ramps.u16), NNSUBBUF, &n); break;
case LIBCOOPGAMMA_UINT32: r = libcoopgamma_ramps_unmarshal(&(this->ramps.u32), NNSUBBUF, &n); break;
case LIBCOOPGAMMA_UINT64: r = libcoopgamma_ramps_unmarshal(&(this->ramps.u64), NNSUBBUF, &n); break;
case LIBCOOPGAMMA_FLOAT: r = libcoopgamma_ramps_unmarshal(&(this->ramps.f), NNSUBBUF, &n); break;
case LIBCOOPGAMMA_DOUBLE: r = libcoopgamma_ramps_unmarshal(&(this->ramps.d), NNSUBBUF, &n); break;
default:
break;
}
if (r != LIBCOOPGAMMA_SUCCESS)
return r;
off += n;
UNMARSHAL_EPILOGUE;
}
/**
* Initialise a `libcoopgamma_filter_table_t`
*
* @param this The record to initialise
* @return Zero on success, -1 on error
*/
int libcoopgamma_filter_table_initialise(libcoopgamma_filter_table_t* restrict this)
{
memset(this, 0, sizeof(*this));
return 0;
}
/**
* Release all resources allocated to a `libcoopgamma_filter_table_t`,
* the allocation of the record itself is not freed
*
* Always call this function after failed call to `libcoopgamma_filter_table_initialise`
* or failed call to `libcoopgamma_filter_table_unmarshal`
*
* @param this The record to destroy
*/
void libcoopgamma_filter_table_destroy(libcoopgamma_filter_table_t* restrict this)
{
while (this->filter_count)
libcoopgamma_queried_filter_destroy(this->filters + --(this->filter_count));
free(this->filters), this->filters = NULL;
}
/**
* Marshal a `libcoopgamma_filter_table_t` into a buffer
*
* @param this The record to marshal
* @param vbuf The output buffer, `NULL` to only measure
* how large this buffer has to be
* @return The number of marshalled bytes, or if `buf == NULL`,
* how many bytes would be marshalled if `buf != NULL`
*/
size_t libcoopgamma_filter_table_marshal(const libcoopgamma_filter_table_t* restrict this, void* restrict vbuf)
{
size_t i;
MARSHAL_PROLOGUE;
marshal_version(LIBCOOPGAMMA_FILTER_TABLE_VERSION);
marshal_version(LIBCOOPGAMMA_DEPTH_VERSION);
marshal_prim(this->depth, libcoopgamma_depth_t);
marshal_prim(this->red_size, size_t);
marshal_prim(this->green_size, size_t);
marshal_prim(this->blue_size, size_t);
marshal_prim(this->filter_count, size_t);
for (i = 0; i < this->filter_count; i++)
off += libcoopgamma_queried_filter_marshal(this->filters + i, SUBBUF, this->depth);
MARSHAL_EPILOGUE;
}
/**
* Unmarshal a `libcoopgamma_filter_table_t` from a buffer
*
* @param this The output paramater for unmarshalled record
* @param vbuf The buffer with the marshalled record
* @param np Output parameter for the number of unmarshalled bytes, undefined on failure
* @return `LIBCOOPGAMMA_SUCCESS` (0), `LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE`,
* `LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE`, or `LIBCOOPGAMMA_ERRNO_SET`
*/
int libcoopgamma_filter_table_unmarshal(libcoopgamma_filter_table_t* restrict this,
const void* restrict vbuf, size_t* restrict np)
{
size_t i, n, fn;
int r;
UNMARSHAL_PROLOGUE;
this->filter_count = 0;
this->filters = NULL;
unmarshal_version(LIBCOOPGAMMA_FILTER_TABLE_VERSION);
unmarshal_version(LIBCOOPGAMMA_DEPTH_VERSION);
unmarshal_prim(this->depth, libcoopgamma_depth_t);
unmarshal_prim(this->red_size, size_t);
unmarshal_prim(this->green_size, size_t);
unmarshal_prim(this->blue_size, size_t);
unmarshal_prim(fn, size_t);
this->filters = malloc(fn * sizeof(*(this->filters)));
if (this->filters == NULL)
return LIBCOOPGAMMA_ERRNO_SET;
for (i = 0; i < fn; i++)
{
r = libcoopgamma_queried_filter_unmarshal(this->filters + i, NNSUBBUF, &n, this->depth);
if (r != LIBCOOPGAMMA_SUCCESS)
return r;
off += n;
this->filter_count += 1;
}
UNMARSHAL_EPILOGUE;
}
/**
* Initialise a `libcoopgamma_error_t`
*
* @param this The record to initialise
* @return Zero on success, -1 on error
*/
int libcoopgamma_error_initialise(libcoopgamma_error_t* restrict this)
{
this->number = 0;
this->custom = 0;
this->description = NULL;
return 0;
}
/**
* Release all resources allocated to a `libcoopgamma_error_t`,
* the allocation of the record itself is not freed
*
* Always call this function after failed call to `libcoopgamma_error_initialise`
* or failed call to `libcoopgamma_error_unmarshal`
*
* @param this The record to destroy
*/
void libcoopgamma_error_destroy(libcoopgamma_error_t* restrict this)
{
free(this->description), this->description = NULL;
}
/**
* Marshal a `libcoopgamma_error_t` into a buffer
*
* @param this The record to marshal
* @param vbuf The output buffer, `NULL` to only measure
* how large this buffer has to be
* @return The number of marshalled bytes, or if `buf == NULL`,
* how many bytes would be marshalled if `buf != NULL`
*/
size_t libcoopgamma_error_marshal(const libcoopgamma_error_t* restrict this, void* restrict vbuf)
{
MARSHAL_PROLOGUE;
marshal_version(LIBCOOPGAMMA_ERROR_VERSION);
marshal_prim(this->number, uint64_t);
marshal_prim(this->custom, int);
marshal_prim(this->server_side, int);
marshal_string(this->description);
MARSHAL_EPILOGUE;
}
/**
* Unmarshal a `libcoopgamma_error_t` from a buffer
*
* @param this The output paramater for unmarshalled record
* @param vbuf The buffer with the marshalled record
* @param np Output parameter for the number of unmarshalled bytes, undefined on failure
* @return `LIBCOOPGAMMA_SUCCESS` (0), `LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE`,
* `LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE`, or `LIBCOOPGAMMA_ERRNO_SET`
*/
int libcoopgamma_error_unmarshal(libcoopgamma_error_t* restrict this,
const void* restrict vbuf, size_t* restrict np)
{
UNMARSHAL_PROLOGUE;
this->description = NULL;
unmarshal_version(LIBCOOPGAMMA_ERROR_VERSION);
unmarshal_prim(this->number, uint64_t);
unmarshal_prim(this->custom, int);
unmarshal_string(this->description);
UNMARSHAL_EPILOGUE;
}
/**
* Initialise a `libcoopgamma_context_t`
*
* @param this The record to initialise
* @return Zero on success, -1 on error
*/
int libcoopgamma_context_initialise(libcoopgamma_context_t* restrict this)
{
memset(this, 0, sizeof(*this));
this->fd = -1;
return 0;
}
/**
* Release all resources allocated to a `libcoopgamma_context_t`,
* the allocation of the record itself is not freed
*
* Always call this function after failed call to `libcoopgamma_context_initialise`
* or failed call to `libcoopgamma_context_unmarshal`
*
* @param this The record to destroy
* @param disconnect Disconnect from the server?
*/
void libcoopgamma_context_destroy(libcoopgamma_context_t* restrict this, int disconnect)
{
if (disconnect && (this->fd >= 0))
{
shutdown(this->fd, SHUT_RDWR);
close(this->fd);
}
this->fd = -1;
libcoopgamma_error_destroy(&(this->error));
free(this->outbound), this->outbound = NULL;
free(this->inbound), this->inbound = NULL;
}
/**
* Marshal a `libcoopgamma_context_t` into a buffer
*
* @param this The record to marshal
* @param vbuf The output buffer, `NULL` to only measure
* how large this buffer has to be
* @return The number of marshalled bytes, or if `buf == NULL`,
* how many bytes would be marshalled if `buf != NULL`
*/
size_t libcoopgamma_context_marshal(const libcoopgamma_context_t* restrict this, void* restrict vbuf)
{
MARSHAL_PROLOGUE;
marshal_version(LIBCOOPGAMMA_CONTEXT_VERSION);
marshal_prim(this->fd, int);
off += libcoopgamma_error_marshal(&(this->error), SUBBUF);
marshal_prim(this->message_id, uint32_t);
marshal_prim(this->outbound_head - this->outbound_tail, size_t);
marshal_buffer(this->outbound + this->outbound_head, this->outbound_head - this->outbound_tail);
marshal_prim(this->inbound_head - this->inbound_tail, size_t);
marshal_buffer(this->inbound + this->inbound_head, this->inbound_head - this->inbound_tail);
marshal_prim(this->length, size_t);
marshal_prim(this->curline, size_t);
marshal_prim(this->in_response_to, uint32_t);
marshal_prim(this->have_all_headers, int);
marshal_prim(this->bad_message, int);
MARSHAL_EPILOGUE;
}
/**
* Unmarshal a `libcoopgamma_context_t` from a buffer
*
* @param this The output paramater for unmarshalled record
* @param vbuf The buffer with the marshalled record
* @param np Output parameter for the number of unmarshalled bytes, undefined on failure
* @return `LIBCOOPGAMMA_SUCCESS` (0), `LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE`,
* `LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE`, or `LIBCOOPGAMMA_ERRNO_SET`
*/
int libcoopgamma_context_unmarshal(libcoopgamma_context_t* restrict this,
const void* restrict vbuf, size_t* restrict np)
{
size_t n;
int r;
UNMARSHAL_PROLOGUE;
memset(this, 0, sizeof(*this));
unmarshal_version(LIBCOOPGAMMA_CONTEXT_VERSION);
unmarshal_prim(this->fd, int);
r = libcoopgamma_error_unmarshal(&(this->error), NNSUBBUF, &n);
if (r != LIBCOOPGAMMA_SUCCESS)
return r;
off += n;
unmarshal_prim(this->message_id, uint32_t);
unmarshal_prim(this->inbound_head, size_t);
this->outbound_size = this->outbound_head;
unmarshal_buffer(this->outbound, this->outbound_head);
this->inbound_size = this->inbound_head;
unmarshal_buffer(this->inbound, this->inbound_head);
unmarshal_prim(this->length, size_t);
unmarshal_prim(this->curline, size_t);
unmarshal_prim(this->in_response_to, uint32_t);
unmarshal_prim(this->have_all_headers, int);
unmarshal_prim(this->bad_message, int);
UNMARSHAL_EPILOGUE;
}
/**
* Initialise a `libcoopgamma_async_context_t`
*
* @param this The record to initialise
* @return Zero on success, -1 on error
*/
int libcoopgamma_async_context_initialise(libcoopgamma_async_context_t* restrict this)
{
this->message_id = 0;
this->coalesce = 0;
return 0;
}
/**
* Release all resources allocated to a `libcoopgamma_async_context_t`,
* the allocation of the record itself is not freed
*
* Always call this function after failed call to `libcoopgamma_async_context_initialise`
* or failed call to `libcoopgamma_async_context_unmarshal`
*
* @param this The record to destroy
*/
#if defined(__GNUC__)
__attribute__((__const__))
#endif
void libcoopgamma_async_context_destroy(libcoopgamma_async_context_t* restrict this)
{
(void) this;
}
/**
* Marshal a `libcoopgamma_async_context_t` into a buffer
*
* @param this The record to marshal
* @param vbuf The output buffer, `NULL` to only measure
* how large this buffer has to be
* @return The number of marshalled bytes, or if `buf == NULL`,
* how many bytes would be marshalled if `buf != NULL`
*/
size_t libcoopgamma_async_context_marshal(const libcoopgamma_async_context_t* restrict this,
void* restrict vbuf)
{
MARSHAL_PROLOGUE;
marshal_version(LIBCOOPGAMMA_ASYNC_CONTEXT_VERSION);
marshal_prim(this->message_id, uint32_t);
marshal_prim(this->coalesce, int);
MARSHAL_EPILOGUE;
}
/**
* Unmarshal a `libcoopgamma_async_context_t` from a buffer
*
* @param this The output paramater for unmarshalled record
* @param vbuf The buffer with the marshalled record
* @param np Output parameter for the number of unmarshalled bytes, undefined on failure
* @return `LIBCOOPGAMMA_SUCCESS` (0), `LIBCOOPGAMMA_INCOMPATIBLE_DOWNGRADE`,
* `LIBCOOPGAMMA_INCOMPATIBLE_UPGRADE`, or `LIBCOOPGAMMA_ERRNO_SET`
*/
int libcoopgamma_async_context_unmarshal(libcoopgamma_async_context_t* restrict this,
const void* restrict vbuf, size_t* restrict np)
{
UNMARSHAL_PROLOGUE;
unmarshal_version(LIBCOOPGAMMA_ASYNC_CONTEXT_VERSION);
unmarshal_prim(this->message_id, uint32_t);
unmarshal_prim(this->coalesce, int);
UNMARSHAL_EPILOGUE;
}
/**
* List all recognised adjustment method
*
* SIGCHLD must not be ignored or blocked
*
* @return A `NULL`-terminated list of names. You should only free
* the outer pointer, inner pointers are subpointers of the
* outer pointer and cannot be freed. `NULL` on error.
*/
char** libcoopgamma_get_methods(void)
{
char num[5]; /* The size is base on the fact that we have limited `n` in the loop below */
char** methods = NULL;
char** rc;
char* buffer;
int n = 0, saved_errno;
size_t size = 0;
methods = malloc(4 * sizeof(*methods));
if (methods == NULL)
goto fail;
for (n = 0; n < 10000 /* just to be safe */; n++)
{
char* method;
if ((n >= 4) && ((n & -n) == n))
{
void* new = realloc(methods, (size_t)(n << 1) * sizeof(*methods));
if (new == NULL)
goto fail;
methods = new;
}
sprintf(num, "%i", n);
if (libcoopgamma_get_method_and_site(num, NULL, &method, NULL))
goto fail;
if (!strcmp(method, num))
{
free(method);
break;
}
methods[n] = method;
size += strlen(method) + 1;
}
rc = malloc((size_t)(n + 1) * sizeof(char*) + size);
if (rc == NULL)
goto fail;
buffer = ((char*)rc) + (size_t)(n + 1) * sizeof(char*);
rc[n] = NULL;
while (n--)
{
buffer = stpcpy(buffer, methods[n]) + 1;
free(methods[n]);
}
free(methods);
return rc;
fail:
saved_errno = errno;
while (n--)
free(methods[n]);
free(methods);
errno = saved_errno;
return NULL;
}
/**
* Run coopgammad with -q or -qq and return the response
*
* SIGCHLD must not be ignored or blocked
*
* @param method The adjustment method, `NULL` for automatic
* @param site The site, `NULL` for automatic
* @param arg "-q" or "-qq", which shall be passed to coopgammad?
* @return The output of coopgammad, `NULL` on error. This
* will be NUL-terminated and will not contain any
* other `NUL` bytes.
*/
static char* libcoopgamma_query(const char* restrict method, const char* restrict site, const char* restrict arg)
{
const char* (args[7]) = {"coopgammad", arg};
size_t i = 2, n = 0, size = 0;
int pipe_rw[2] = { -1, -1 };
pid_t pid;
int saved_errno, status;
char* msg = NULL;
ssize_t got;
if (method != NULL) args[i++] = "-m", args[i++] = method;
if (site != NULL) args[i++] = "-s", args[i++] = site;
args[i] = NULL;
if (pipe(pipe_rw) < 0)
goto fail;
switch ((pid = fork()))
{
case -1:
goto fail;
case 0:
/* Child */
close(pipe_rw[0]);
if (pipe_rw[1] != STDOUT_FILENO)
{
close(STDOUT_FILENO);
if (dup2(pipe_rw[1], STDOUT_FILENO) < 0)
goto fail_child;
close(pipe_rw[1]);
}
#if defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wcast-qual"
#endif
execvp("coopgammad", (char* const*)(args));
#if defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
fail_child:
saved_errno = errno;
perror(NAME_OF_THE_PROCESS);
if (write(STDOUT_FILENO, &saved_errno, sizeof(int)) != sizeof(int))
perror(NAME_OF_THE_PROCESS);
exit(1);
default:
/* Parent */
close(pipe_rw[1]), pipe_rw[1] = -1;
for (;;)
{
if (n == size)
{
void* new = realloc(msg, size = (n ? (n << 1) : 256));
if (new == NULL)
goto fail;
msg = new;
}
got = read(pipe_rw[0], msg + n, size - n);
if (got < 0)
{
if (errno == EINTR)
continue;
goto fail;
}
else if (got == 0)
break;
n += (size_t)got;
}
close(pipe_rw[0]), pipe_rw[0] = -1;
if (waitpid(pid, &status, 0) < 0)
goto fail;
if (status)
{
errno = INVAL;
if ((n == sizeof(int)) && (*(int*)msg != 0))
errno = *(int*)msg;
}
break;
}
if (n == size)
{
void* new = realloc(msg, n + 1);
if (new == NULL)
goto fail;
msg = new;
}
msg[n] = '\0';
if (strchr(msg, '\0') != msg + n)
{
errno = EBADMSG;
goto fail;
}
return msg;
fail:
saved_errno = errno;
if (pipe_rw[0] >= 0) close(pipe_rw[0]);
if (pipe_rw[1] >= 0) close(pipe_rw[1]);
free(msg);
errno = saved_errno;
return NULL;
}
/**
* Get the adjustment method and site
*
* SIGCHLD must not be ignored or blocked
*
* @param method The adjustment method, `NULL` for automatic
* @param site The site, `NULL` for automatic
* @param methodp Output pointer for the selected adjustment method,
* which cannot be `NULL`. It is safe to call
* this function with this parameter set to `NULL`.
* @param sitep Output pointer for the selected site, which will
* be `NULL` the method only supports one site or if
* `site == NULL` and no site can be selected
* automatically. It is safe to call this function
* with this parameter set to `NULL`.
* @return Zero on success, -1 on error
*/
int libcoopgamma_get_method_and_site(const char* restrict method, const char* restrict site,
char** restrict methodp, char** restrict sitep)
{
int saved_errno;
char* raw;
char* p;
char* q;
raw = libcoopgamma_query(method, site, "-q");
if (raw == NULL)
return -1;
if (methodp != NULL) *methodp = NULL;
if (sitep != NULL) *sitep = NULL;
p = strchr(raw, '\n');
if (p == NULL)
{
errno = EBADMSG;
goto fail;
}
*p++ = '\0';
if (methodp != NULL)
{
*methodp = malloc(strlen(raw) + 1);
if (*methodp == NULL)
goto fail;
strcpy(*methodp, raw);
}
if ((site != NULL) && *(q = strchr(p, '\0') - 1))
{
if (*q != '\n')
{
errno = EBADMSG;
goto fail;
}
*q = '\0';
*sitep = malloc(strlen(p) + 1);
if (*sitep == NULL)
goto fail;
strcpy(*sitep, p);
}
free(raw);
return 0;
fail:
saved_errno = errno;
if (methodp != NULL)
free(*methodp), *methodp = NULL;
free(raw);
errno = saved_errno;
return -1;
}
/**
* Get the PID file of the coopgamma server
*
* SIGCHLD must not be ignored or blocked
*
* @param method The adjustment method, `NULL` for automatic
* @param site The site, `NULL` for automatic
* @return The pathname of the server's PID file, `NULL` on error
* or if there server does not use PID files. The later
* case is detected by checking that `errno` is set to 0.
*/
char* libcoopgamma_get_pid_file(const char* restrict method, const char* restrict site)
{
char* path;
size_t n;
path = libcoopgamma_get_socket_file(method, site);
if (path == NULL)
return NULL;
n = strlen(path);
if (n < 7 || strcmp(path + n - 7, ".socket"))
{
free(path);
errno = EBADMSG;
return NULL;
}
strcpy(path + n - 7, ".pid");
return path;
}
/**
* Get the socket file of the coopgamma server
*
* SIGCHLD must not be ignored or blocked
*
* @param method The adjustment method, `NULL` for automatic
* @param site The site, `NULL` for automatic
* @return The pathname of the server's socket, `NULL` on error
* or if there server does have its own socket. The later
* case is detected by checking that `errno` is set to 0,
* and is the case when communicating with a server in a
* multi-server display server like mds.
*/
char* libcoopgamma_get_socket_file(const char* restrict method, const char* restrict site)
{
int saved_errno;
char* raw;
char* p;
raw = libcoopgamma_query(method, site, "-qq");
if (raw == NULL)
return NULL;
p = strchr(raw, '\0') - 1;
if (*p != '\n')
{
errno = EBADMSG;
goto fail;
}
*p = '\0';
if (*raw == '\0')
{
errno = EBADMSG;
goto fail;
}
return raw;
fail:
saved_errno = errno;
free(raw);
errno = saved_errno;
return NULL;
}
/**
* Connect to a coopgamma server, and start it if necessary
*
* Use `libcoopgamma_context_destroy` to disconnect
*
* SIGCHLD must not be ignored or blocked
*
* @param method The adjustment method, `NULL` for automatic
* @param site The site, `NULL` for automatic
* @param ctx The state of the library, must be initialised
* @return Zero on success, -1 on error. On error, `errno` is set
* to 0 if the server could not be initialised.
*/
int libcoopgamma_connect(const char* restrict method, const char* restrict site,
libcoopgamma_context_t* restrict ctx)
{
const char* (args[6]) = {"coopgammad"};
struct sockaddr_un address;
char* path;
int saved_errno;
int tries = 0, status;
pid_t pid;
size_t i = 1;
if (method != NULL) args[i++] = "-m", args[i++] = method;
if (site != NULL) args[i++] = "-s", args[i++] = site;
args[i] = NULL;
path = libcoopgamma_get_socket_file(method, site);
if (path == NULL)
return -1;
if (strlen(path) <= sizeof(address.sun_path))
{
free(path);
errno = ENAMETOOLONG;
return -1;
}
address.sun_family = AF_UNIX;
strcpy(address.sun_path, path);
free(path);
if ((ctx->fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
return -1;
retry:
if (connect(ctx->fd, (struct sockaddr*)(&address), (socklen_t)sizeof(address)) < 0)
{
if (((errno == ECONNREFUSED) || (errno == ENOENT) || (errno == ENOTDIR)) && !tries++)
{
switch ((pid = fork()))
{
case -1:
goto fail;
case 0:
/* Child */
close(ctx->fd);
#if defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wcast-qual"
#endif
execvp("coopgammad", (char* const*)(args));
#if defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
perror(NAME_OF_THE_PROCESS);
exit(1);
default:
/* Parent */
if (waitpid(pid, &status, 0) < 0)
goto fail;
if (status)
{
errno = 0;
goto fail;
}
break;
}
goto retry;
}
goto fail;
}
return 0;
fail:
saved_errno = errno;
close(ctx->fd), ctx->fd = -1;
errno = saved_errno;
return -1;
}
/**
* By default communication is blocking, this function
* can be used to switch between blocking and nonblocking
*
* After setting the communication to nonblocking,
* `libcoopgamma_flush`, `libcoopgamma_synchronise` and
* and request-sending functions can fail with EAGAIN and
* EWOULDBLOCK. It is safe to continue with `libcoopgamma_flush`
* (for `libcoopgamma_flush` it selfand equest-sending functions)
* or `libcoopgamma_synchronise` just like EINTR failure.
*
* @param ctx The state of the library, must be connected
* @param nonblocking Nonblocking mode?
* @return Zero on success, -1 on error
*/
int libcoopgamma_set_nonblocking(libcoopgamma_context_t* restrict ctx, int nonblocking)
{
int flags = fcntl(ctx->fd, F_GETFL);
if (nonblocking)
flags |= O_NONBLOCK;
else
flags &= ~O_NONBLOCK;
if (fcntl(ctx->fd, F_SETFL, flags) == -1)
return -1;
return 0;
}
/**
* Send all pending outbound data
*
* If this function or another function that sends a request
* to the server fails with EINTR, call this function to
* complete the transfer. The `async` parameter will always
* be in a properly configured state if a function fails
* with EINTR.
*
* @param ctx The state of the library, must be connected
* @return Zero on success, -1 on error
*/
int libcoopgamma_flush(libcoopgamma_context_t* restrict ctx)
{
ssize_t sent;
size_t chunksize = ctx->outbound_head - ctx->outbound_tail;
size_t sendsize;
while (ctx->outbound_tail < ctx->outbound_head)
{
sendsize = ctx->outbound_head - ctx->outbound_tail;
sendsize = sendsize < chunksize ? sendsize : chunksize;
sent = send(ctx->fd, ctx->outbound + ctx->outbound_tail, sendsize, 0);
if (sent < 0)
{
if (errno != EMSGSIZE)
return -1;
if ((chunksize >>= 1) == 0)
return -1;
continue;
}
ctx->outbound_tail += (size_t)sent;
}
return 0;
}
/**
* Wait for the next message to be received
*
* @param ctx The state of the library, must be connected
* @param pending Information for each pending request
* @param n The number of elements in `pending`
* @param selected The index of the element in `pending` which corresponds
* to the first inbound message, note that this only means
* that the message is not for any of the other request,
* if the message is corrupt any of the listed requests can
* be selected even if it is not for any of the requests.
* Functions that parse the message will detect such corruption.
* @return Zero on success, -1 on error, -2 if the message is ignored
* which happens if corresponding `libcoopgamma_async_context_t`
* is not listed. If `-1` is returned, `errno` will be set,
* if it is set to `ENOTRECOVERABLE` you have receive a corrupt
* message and the context has been tainted beyond recover.
*/
int libcoopgamma_synchronise(libcoopgamma_context_t* restrict ctx,
libcoopgamma_async_context_t* restrict pending,
size_t n, size_t* restrict selected)
{
char temp[3 * sizeof(size_t) + 1];
ssize_t got;
size_t i;
char* p;
char* line;
char* value;
if (ctx->inbound_head == ctx->inbound_tail)
ctx->inbound_head = ctx->inbound_tail = 0;
if (ctx->inbound_tail > 0)
{
memmove(ctx->inbound, ctx->inbound + ctx->inbound_tail, ctx->inbound_head -= ctx->inbound_tail);
ctx->inbound_tail = 0;
}
for (;;)
{
if (ctx->inbound_head == ctx->inbound_size)
{
size_t new_size = ctx->inbound_size ? (ctx->inbound_size << 1) : 1024;
void* new = realloc(ctx->inbound, new_size);
if (new == NULL)
return -1;
ctx->inbound = new;
ctx->inbound_size = new_size;
}
got = recv(ctx->fd, ctx->inbound + ctx->inbound_head, ctx->inbound_size - ctx->inbound_head, 0);
if (got <= 0)
{
if (got == 0)
errno = ECONNRESET;
return -1;
}
ctx->inbound_head += (size_t)got;
while (ctx->have_all_headers == 0)
{
line = ctx->inbound + ctx->curline;
p = memchr(line, '\n', ctx->inbound_head - ctx->curline);
if (p == NULL)
break;
if (memchr(line, '\0', ctx->inbound_head - ctx->curline) != NULL)
ctx->bad_message = 1;
*p++ = '\0';
ctx->curline += (size_t)(p - ctx->inbound);
if (!*line)
{
ctx->have_all_headers = 1;
}
else if (strstr(line, "In response to: ") == line)
{
value = line + (sizeof("In response to: ") - 1);
ctx->in_response_to = (uint32_t)atol(value);
}
else if (strstr(line, "Length: ") == line)
{
value = line + (sizeof("Length: ") - 1);
ctx->length = (size_t)atol(value);
sprintf(temp, "%zu", ctx->length);
if (strcmp(value, temp))
goto fatal;
}
}
if (ctx->have_all_headers && (ctx->inbound_head >= ctx->curline + ctx->length))
{
ctx->curline += ctx->length;
if (ctx->bad_message)
{
ctx->bad_message = 0;
ctx->have_all_headers = 0;
ctx->length = 0;
ctx->inbound_tail = ctx->curline;
errno = EBADMSG;
return -1;
}
for (i = 0; i < n; i++)
if (pending[i].message_id == ctx->in_response_to)
{
*selected = i;
return 0;
}
*selected = 0;
ctx->bad_message = 0;
ctx->have_all_headers = 0;
ctx->length = 0;
ctx->inbound_tail = ctx->curline;
return -2;
}
}
fatal:
errno = ENOTRECOVERABLE;
return -1;
}
/**
* Send a message to the server and wait for response
*
* @param resp:char** Output parameter for the response,
* will be NUL-terminated
* @param ctx:libcoopgamma_context_t* The state of the library
* @param payload:void* Data to append to the end of the message
* @param payload_size:size_t Byte-size of `payload`
* @param format:string-literal Message formatting string
* @param ... Message formatting arguments
*
* On error, the macro goes to `fail`.
*/
#define SEND_MESSAGE(ctx, payload, payload_size, format, ...) \
do \
{ \
ssize_t n__; \
char* msg__; \
snprintf(NULL, (size_t)0, format "%zn", __VA_ARGS__, &n__); \
msg__ = malloc((size_t)n__ + (payload_size)); \
if (msg__ == NULL) \
goto fail; \
sprintf(msg__, format, __VA_ARGS__); \
if ((payload) != NULL) \
memcpy(msg__ + n__, (payload), (payload_size)); \
if (send_message((ctx), msg__, (size_t)n__ + (payload_size)) < 0) \
goto fail; \
free(msg__); \
} \
while (0)
/**
* Send a message to the server and wait for response
*
* @param ctx The state of the library
* @param msg The message to send
* @param n The length of `msg`
* @return Zero on success, -1 on error
*/
static int send_message(libcoopgamma_context_t* restrict ctx, char* msg, size_t n)
{
if (ctx->outbound_head == ctx->outbound_tail)
{
free(ctx->outbound);
ctx->outbound = msg;
ctx->outbound_tail = 0;
ctx->outbound_head = n;
ctx->outbound_size = n;
}
else
{
if (ctx->outbound_head + n > ctx->outbound_size)
{
memmove(ctx->outbound, ctx->outbound + ctx->outbound_tail, ctx->outbound_head -= ctx->outbound_tail);
ctx->outbound_tail = 0;
}
if (ctx->outbound_head + n > ctx->outbound_size)
{
void* new = realloc(ctx->outbound, ctx->outbound_head + n);
if (new == NULL)
{
int saved_errno = errno;
free(msg);
errno = saved_errno;
return -1;
}
ctx->outbound = new;
ctx->outbound_size = ctx->outbound_head + n;
}
memcpy(ctx->outbound + ctx->outbound_head, msg, n);
ctx->outbound_head += n;
ctx->message_id += 1;
free(msg);
}
return libcoopgamma_flush(ctx);
}
/**
* Get the next header of the inbound message
*
* All headers must be read before the payload is read
*
* @param ctx The state of the library, must be connected
* @return The next header line, can never be `NULL`,
* the empty string marks the end of the headers.
* This memory segment must not be freed.
*/
static char* next_header(libcoopgamma_context_t* restrict ctx)
{
char* rc = ctx->inbound + ctx->inbound_tail;
ctx->inbound_tail += strlen(ctx->inbound) + 1;
return rc;
}
/**
* Get the payload of the inbound message
*
* Calling this function marks that the inbound message
* has been fully ready. You must call this function
* even if you do not expect a payload
*
* @param ctx The state of the library, must be connected
* @param n Output parameter for the size of the payload
* @return The payload (not NUL-terminated), `NULL` if
* there is no payload. Failure is impossible.
* This memory segment must not be freed.
*/
static char* next_payload(libcoopgamma_context_t* restrict ctx, size_t* n)
{
ctx->have_all_headers = 0;
if ((*n = ctx->length))
{
char* rc = ctx->inbound + ctx->inbound_tail;
ctx->inbound_tail += *n;
ctx->length = 0;
return rc;
}
else
return NULL;
}
/**
* Check whether the server sent an error, if so copy it to `ctx`
*
* This function will also reports EBADMSG if the message ID
* that the message is a response to does not match the request
* information, or if it is missing
*
* @param ctx The state of the library, must be connected
* @param async Information about the request
* @return 1 if the server sent an error (even indicating success),
* 0 on success, -1 on failure. Information about failure
* is copied `ctx`.
*/
static int check_error(libcoopgamma_context_t* restrict ctx, libcoopgamma_async_context_t* restrict async)
{
char temp[3 * sizeof(uint64_t) + 1];
size_t old_tail = ctx->inbound_tail;
char* line;
char* value;
int command_ok = 0;
int have_in_response_to = 0;
int have_error = 0;
int bad = 0;
for (;;)
{
line = next_header(ctx);
value = strchr(line, ':') + 2;
if (!*line)
break;
else if (!strcmp(line, "Command: error"))
command_ok = 1;
else if (strstr(line, "In response to: ") == line)
{
uint32_t id = (uint32_t)atol(value);
have_in_response_to = 1 + !!have_in_response_to;
if (id != async->message_id)
bad = 1;
else
{
sprintf(temp, "%" PRIu32, id);
if (strcmp(value, temp))
bad = 1;
}
}
else if (strstr(line, "Error: ") == line)
{
have_error = 1 + !!have_error;
ctx->error.server_side = 1;
ctx->error.custom = (strstr(value, "custom") == value);
if (ctx->error.custom)
{
if (value[6] == '\0')
{
ctx->error.number = 0;
continue;
}
else if (value[6] != ' ')
{
bad = 1;
continue;
}
}
ctx->error.number = (uint64_t)atoll(value);
sprintf(temp, "%" PRIu64, ctx->error.number);
if (strcmp(value, temp))
bad = 1;
}
}
if (command_ok == 0)
{
ctx->inbound_tail = old_tail;
return 0;
}
if (bad || (have_in_response_to != 1) || (have_error != 1))
{
errno = EBADMSG;
copy_errno(ctx);
return -1;
}
return 1;
}
#if defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wnonnull"
#endif
/**
* List all available CRTC:s, send request part
*
* Cannot be used before connecting to the server
*
* @param ctx The state of the library, must be connected
* @param async Information about the request, that is needed to
* identify and parse the response, is stored here
* @return Zero on success, -1 on error
*/
int libcoopgamma_get_crtcs_send(libcoopgamma_context_t* restrict ctx,
libcoopgamma_async_context_t* restrict async)
{
async->message_id = ctx->message_id;
SEND_MESSAGE(ctx, NULL, (size_t)0,
"Command: enumerate-crtcs\n"
"Message ID: %" PRIu32 "\n"
"\n",
ctx->message_id);
return 0;
fail:
copy_errno(ctx);
return -1;
}
/**
* List all available CRTC:s, receive response part
*
* @param ctx The state of the library, must be connected
* @param async Information about the request
* @return A `NULL`-terminated list of names. You should only free
* the outer pointer, inner pointers are subpointers of the
* outer pointer and cannot be freed. `NULL` on error, in
* which case `ctx->error` (rather than `errno`) is read
* for information about the error.
*/
char** libcoopgamma_get_crtcs_recv(libcoopgamma_context_t* restrict ctx,
libcoopgamma_async_context_t* restrict async)
{
char* line;
char* payload;
char* end;
int command_ok = 0;
size_t i, n, lines, len, length;
char** rc;
if (check_error(ctx, async))
return NULL;
for (;;)
{
line = next_header(ctx);
if (!*line)
break;
else if (!strcmp(line, "Command: crtc-enumeration"))
command_ok = 1;
}
payload = next_payload(ctx, &n);
if (!command_ok || ((n > 0) && (payload[n - 1] != '\n')))
{
errno = EBADMSG;
copy_errno(ctx);
return NULL;
}
line = payload;
end = payload + n;
lines = length = 0;
while (line != end)
{
lines += 1;
length += len = (size_t)(strchr(line, '\n') + 1 - line);
line += len;
line[-1] = '\0';
}
rc = malloc((lines + 1) * sizeof(char*) + length);
if (rc == NULL)
{
copy_errno(ctx);
return NULL;
}
line = ((char*)rc) + (lines + 1) * sizeof(char*);
memcpy(line, payload, length);
rc[lines] = NULL;
for (i = 0; i < lines; i++)
{
rc[i] = line;
line = strchr(line, '\0') + 1;
}
return rc;
}
/**
* List all available CRTC:s, synchronous version
*
* This is a synchronous request function, as such,
* you have to ensure that communication is blocking
* (default), and that there are not asynchronous
* requests waiting, it also means that EINTR:s are
* silently ignored and there no wait to cancel the
* operation without disconnection from the server
*
* @param ctx The state of the library, must be connected
* @return A `NULL`-terminated list of names. You should only free
* the outer pointer, inner pointers are subpointers of the
* outer pointer and cannot be freed. `NULL` on error, in
* which case `ctx->error` (rather than `errno`) is read
* for information about the error.
*/
char** libcoopgamma_get_crtcs_sync(libcoopgamma_context_t* restrict ctx)
{
SYNC_CALL(libcoopgamma_get_crtcs_send(ctx, &async),
libcoopgamma_get_crtcs_recv(ctx, &async), NULL);
}
/**
* Retrieve information about a CRTC:s gamma ramps, send request part
*
* Cannot be used before connecting to the server
*
* @param crtc The name of the CRTC
* @param ctx The state of the library, must be connected
* @param async Information about the request, that is needed to
* identify and parse the response, is stored here
* @return Zero on success, -1 on error
*/
int libcoopgamma_get_gamma_info_send(const char* restrict crtc, libcoopgamma_context_t* restrict ctx,
libcoopgamma_async_context_t* restrict async)
{
#if defined(__GNUC__) && !defined(__clang__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wnonnull-compare"
#endif
if ((crtc == NULL) || strchr(crtc, '\n'))
{
errno = EINVAL;
goto fail;
}
#if defined(__GNUC__) && !defined(__clang__)
# pragma GCC diagnostic pop
#endif
async->message_id = ctx->message_id;
SEND_MESSAGE(ctx, NULL, (size_t)0,
"Command: get-gamma-info\n"
"Message ID: %" PRIu32 "\n"
"CRTC: %s\n"
"\n",
ctx->message_id, crtc);
return 0;
fail:
copy_errno(ctx);
return 0;
}
/**
* Retrieve information about a CRTC:s gamma ramps, receive response part
*
* @param info Output parameter for the information, must be initialised
* @param ctx The state of the library, must be connected
* @param async Information about the request
* @return Zero on success, -1 on error, in which case `ctx->error`
* (rather than `errno`) is read for information about the error
*/
int libcoopgamma_get_gamma_info_recv(libcoopgamma_crtc_info_t* restrict info,
libcoopgamma_context_t* restrict ctx,
libcoopgamma_async_context_t* restrict async)
{
char temp[3 * sizeof(size_t) + 1];
char* line;
char* value;
size_t _n;
int have_cooperative = 0;
int have_depth = 0;
int have_red_size = 0;
int have_green_size = 0;
int have_blue_size = 0;
int have_gamma_support = 0;
int bad = 0, r = 0, g = 0;
if (check_error(ctx, async))
return -1;
info->cooperative = 0; /* Should be in the response, but ... */
for (;;)
{
line = next_header(ctx);
value = strchr(line, ':') + 2;
if (!*line)
break;
else if (strstr(line, "Cooperative: ") == line)
{
have_cooperative = 1 + !!have_cooperative;
if (!strcmp(value, "yes")) info->cooperative = 1;
else if (!strcmp(value, "no")) info->cooperative = 0;
else
bad = 1;
}
else if (strstr(line, "Depth: ") == line)
{
have_depth = 1 + !!have_depth;
if (!strcmp(value, "8")) info->depth = LIBCOOPGAMMA_UINT8;
else if (!strcmp(value, "16")) info->depth = LIBCOOPGAMMA_UINT16;
else if (!strcmp(value, "32")) info->depth = LIBCOOPGAMMA_UINT32;
else if (!strcmp(value, "64")) info->depth = LIBCOOPGAMMA_UINT64;
else if (!strcmp(value, "f")) info->depth = LIBCOOPGAMMA_FLOAT;
else if (!strcmp(value, "d")) info->depth = LIBCOOPGAMMA_DOUBLE;
else
bad = 1;
}
else if (strstr(line, "Gamma support: ") == line)
{
have_gamma_support = 1 + !!have_gamma_support;
if (!strcmp(value, "yes")) info->supported = LIBCOOPGAMMA_YES;
else if (!strcmp(value, "no")) info->supported = LIBCOOPGAMMA_NO;
else if (!strcmp(value, "maybe")) info->supported = LIBCOOPGAMMA_MAYBE;
else
bad = 1;
}
else if (((r = (strstr(line, "Red size: ") == line))) ||
((g = (strstr(line, "Green size: ") == line))) ||
(strstr(line, "Blue size: ") == line))
{
size_t* out;
if (r) have_red_size = 1 + !!have_red_size, out = &(info->red_size);
else if (g) have_green_size = 1 + !!have_green_size, out = &(info->green_size);
else have_blue_size = 1 + !!have_blue_size, out = &(info->blue_size);
*out = (size_t)atol(value);
sprintf(temp, "%zu", *out);
if (strcmp(value, temp))
bad = 1;
}
}
(void) next_payload(ctx, &_n);
if (bad || (have_gamma_support != 1))
{
errno = EBADMSG;
copy_errno(ctx);
return -1;
}
if (info->supported != LIBCOOPGAMMA_NO)
if ((have_cooperative > 1) || (have_depth != 1) || (have_gamma_support != 1) ||
(have_red_size != 1) || (have_green_size != 1) || (have_blue_size != 1))
{
errno = EBADMSG;
copy_errno(ctx);
return -1;
}
return 0;
}
/**
* Retrieve information about a CRTC:s gamma ramps, synchronous version
*
* This is a synchronous request function, as such,
* you have to ensure that communication is blocking
* (default), and that there are not asynchronous
* requests waiting, it also means that EINTR:s are
* silently ignored and there no wait to cancel the
* operation without disconnection from the server
*
* @param crtc The name of the CRTC
* @param info Output parameter for the information, must be initialised
* @param ctx The state of the library, must be connected
* @return Zero on success, -1 on error, in which case `ctx->error`
* (rather than `errno`) is read for information about the error
*/
int libcoopgamma_get_gamma_info_sync(const char* restrict ctrc, libcoopgamma_crtc_info_t* restrict info,
libcoopgamma_context_t* restrict ctx)
{
SYNC_CALL(libcoopgamma_get_gamma_info_send(ctrc, ctx, &async),
libcoopgamma_get_gamma_info_recv(info, ctx, &async), -1);
}
/**
* Retrieve the current gamma ramp adjustments, send request part
*
* Cannot be used before connecting to the server
*
* @param query The query to send
* @param ctx The state of the library, must be connected
* @param async Information about the request, that is needed to
* identify and parse the response, is stored here
* @return Zero on success, -1 on error
*/
int libcoopgamma_get_gamma_send(libcoopgamma_filter_query_t* restrict query,
libcoopgamma_context_t* restrict ctx,
libcoopgamma_async_context_t* restrict async)
{
#if defined(__GNUC__) && !defined(__clang__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wnonnull-compare"
#endif
if ((query == NULL) || (query->crtc == NULL) || strchr(query->crtc, '\n'))
{
errno = EINVAL;
goto fail;
}
#if defined(__GNUC__) && !defined(__clang__)
# pragma GCC diagnostic pop
#endif
async->message_id = ctx->message_id;
async->coalesce = query->coalesce;
SEND_MESSAGE(ctx, NULL, (size_t)0,
"Command: get-gamma\n"
"Message ID: %" PRIu32 "\n"
"CRTC: %s\n"
"Coalesce: %s\n"
"High priority: %" PRIi64 "\n"
"Low priority: %" PRIi64 "\n"
"\n",
ctx->message_id, query->crtc, query->coalesce ? "yes" : "no",
query->high_priority, query->low_priority);
return 0;
fail:
copy_errno(ctx);
return -1;
}
/**
* Retrieve the current gamma ramp adjustments, receive response part
*
* @param table Output for the response, must be initialised
* @param ctx The state of the library, must be connected
* @param async Information about the request
* @return Zero on success, -1 on error, in which case `ctx->error`
* (rather than `errno`) is read for information about the error
*/
int libcoopgamma_get_gamma_recv(libcoopgamma_filter_table_t* restrict table,
libcoopgamma_context_t* restrict ctx,
libcoopgamma_async_context_t* restrict async)
{
char temp[3 * sizeof(size_t) + 1];
char* line;
char* value;
char* payload;
size_t i, n, width, clutsize;
int have_depth = 0;
int have_red_size = 0;
int have_green_size = 0;
int have_blue_size = 0;
int have_tables = 0;
int bad = 0, r = 0, g = 0;
if (check_error(ctx, async))
return -1;
libcoopgamma_filter_table_destroy(table);
for (;;)
{
line = next_header(ctx);
value = strchr(line, ':') + 2;
if (!*line)
break;
else if (strstr(line, "Depth: ") == line)
{
have_depth = 1 + !!have_depth;
if (!strcmp(value, "8")) table->depth = LIBCOOPGAMMA_UINT8;
else if (!strcmp(value, "16")) table->depth = LIBCOOPGAMMA_UINT16;
else if (!strcmp(value, "32")) table->depth = LIBCOOPGAMMA_UINT32;
else if (!strcmp(value, "64")) table->depth = LIBCOOPGAMMA_UINT64;
else if (!strcmp(value, "f")) table->depth = LIBCOOPGAMMA_FLOAT;
else if (!strcmp(value, "d")) table->depth = LIBCOOPGAMMA_DOUBLE;
else
bad = 1;
}
else if (((r = (strstr(line, "Red size: ") == line))) ||
((g = (strstr(line, "Green size: ") == line))) ||
(strstr(line, "Blue size: ") == line))
{
size_t* out;
if (r) have_red_size = 1 + !!have_red_size, out = &(table->red_size);
else if (g) have_green_size = 1 + !!have_green_size, out = &(table->green_size);
else have_blue_size = 1 + !!have_blue_size, out = &(table->blue_size);
*out = (size_t)atol(value);
sprintf(temp, "%zu", *out);
if (strcmp(value, temp))
bad = 1;
}
else if (strstr(line, "Tables: ") == line)
{
have_tables = 1 + have_tables;
table->filter_count = (size_t)atol(value);
sprintf(temp, "%zu", table->filter_count);
if (strcmp(value, temp))
bad = 1;
}
}
payload = next_payload(ctx, &n);
if (bad || (have_depth != 1) || (have_red_size != 1) || (have_green_size != 1) ||
(have_blue_size != 1) || (async->coalesce ? (have_tables > 1) : (have_tables == 0)) ||
(payload == NULL))
goto bad;
switch (table->depth)
{
case LIBCOOPGAMMA_FLOAT: width = sizeof(float); break;
case LIBCOOPGAMMA_DOUBLE: width = sizeof(double); break;
default: INTEGRAL_DEPTHS
if ((table->depth <= 0) || ((table->depth & 7) != 0))
goto bad;
width = (size_t)(table->depth / 8);
break;
}
clutsize = table->red_size + table->green_size + table->blue_size;
clutsize *= width;
if (async->coalesce)
{
if (n != clutsize)
goto bad;
table->filters = malloc(sizeof(*(table->filters)));
if (table->filters == NULL)
goto fail;
table->filters->priority = 0;
table->filters->class = NULL;
if (libcoopgamma_ramps_initialise_(&(table->filters->ramps), width) < 0)
goto fail;
memcpy(table->filters->ramps.u8.red, payload, clutsize);
}
else
{
size_t off = 0, len;
table->filters = calloc(table->filter_count, sizeof(*(table->filters)));
if (table->filters == NULL)
goto fail;
for (i = 0; i < table->filter_count; i++)
{
if (off + sizeof(int64_t) > n)
goto bad;
table->filters[i].priority = *(int64_t*)payload;
off += sizeof(int64_t);
if (memchr(payload + off, '\0', n - off) == NULL)
goto bad;
len = strlen(payload + off) + 1;
table->filters[i].class = malloc(len);
if (table->filters[i].class == NULL)
goto fail;
memcpy(table->filters[i].class, payload + off, len);
off += len;
if (off + clutsize > n)
goto bad;
if (libcoopgamma_ramps_initialise_(&(table->filters[i].ramps), width) < 0)
goto fail;
memcpy(table->filters->ramps.u8.red, payload + off, clutsize);
off += clutsize;
}
if (off != n)
goto bad;
}
return 0;
bad:
errno = EBADMSG;
fail:
copy_errno(ctx);
return -1;
}
/**
* Retrieve the current gamma ramp adjustments, synchronous version
*
* This is a synchronous request function, as such,
* you have to ensure that communication is blocking
* (default), and that there are not asynchronous
* requests waiting, it also means that EINTR:s are
* silently ignored and there no wait to cancel the
* operation without disconnection from the server
*
* @param query The query to send
* @param table Output for the response, must be initialised
* @param ctx The state of the library, must be connected
* @return Zero on success, -1 on error, in which case `ctx->error`
* (rather than `errno`) is read for information about the error
*/
int libcoopgamma_get_gamma_sync(libcoopgamma_filter_query_t* restrict query,
libcoopgamma_filter_table_t* restrict table,
libcoopgamma_context_t* restrict ctx)
{
SYNC_CALL(libcoopgamma_get_gamma_send(query, ctx, &async),
libcoopgamma_get_gamma_recv(table, ctx, &async), -1);
}
/**
* Apply, update, or remove a gamma ramp adjustment, send request part
*
* Cannot be used before connecting to the server
*
* @param filter The filter to apply, update, or remove, gamma ramp meta-data must match the CRTC's
* @param depth The datatype for the stops in the gamma ramps, must match the CRTC's
* @param ctx The state of the library, must be connected
* @param async Information about the request, that is needed to
* identify and parse the response, is stored here
* @return Zero on success, -1 on error
*/
int libcoopgamma_set_gamma_send(libcoopgamma_filter_t* restrict filter, libcoopgamma_depth_t depth,
libcoopgamma_context_t* restrict ctx,
libcoopgamma_async_context_t* restrict async)
{
const void* payload = NULL;
const char* lifespan;
char priority[sizeof("Priority: \n") + 3 * sizeof(int64_t)] = {'\0'};
char length [sizeof("Length: \n") + 3 * sizeof(size_t) ] = {'\0'};
size_t payload_size = 0, stopwidth = 0;
#if defined(__GNUC__) && !defined(__clang__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wnonnull-compare"
#endif
if ((filter == NULL) || (filter->crtc == NULL) || strchr(filter->crtc, '\n') ||
(filter->class == NULL) || strchr(filter->class, '\n'))
{
errno = EINVAL;
goto fail;
}
#if defined(__GNUC__) && !defined(__clang__)
# pragma GCC diagnostic pop
#endif
switch (filter->lifespan)
{
case LIBCOOPGAMMA_REMOVE: lifespan = "remove"; break;
case LIBCOOPGAMMA_UNTIL_DEATH: lifespan = "until-death"; break;
case LIBCOOPGAMMA_UNTIL_REMOVAL: lifespan = "until-removal"; break;
default:
errno = EINVAL;
goto fail;
}
switch (depth)
{
case LIBCOOPGAMMA_FLOAT: stopwidth = sizeof(float); break;
case LIBCOOPGAMMA_DOUBLE: stopwidth = sizeof(double); break;
default: INTEGRAL_DEPTHS
if ((depth <= 0) || ((depth & 7) != 0))
{
errno = EINVAL;
goto fail;
}
stopwidth = (size_t)(depth / 8);
break;
}
if (filter->lifespan != LIBCOOPGAMMA_REMOVE)
{
payload_size = filter->ramps.u8.red_size;
payload_size += filter->ramps.u8.green_size;
payload_size += filter->ramps.u8.blue_size;
payload_size *= stopwidth;
payload = filter->ramps.u8.red;
sprintf(priority, "Priority: %" PRIi64 "\n", filter->priority);
sprintf(length, "Length: %zu\n", payload_size);
}
async->message_id = ctx->message_id;
SEND_MESSAGE(ctx, payload, payload_size,
"Command: set-gamma\n"
"Message ID: %" PRIu32 "\n"
"CRTC: %s\n"
"Class: %s\n"
"Lifespan: %s\n"
"%s"
"%s"
"\n",
ctx->message_id, filter->crtc, filter->class, lifespan,
priority, length);
return 0;
fail:
copy_errno(ctx);
return -1;
}
/**
* Apply, update, or remove a gamma ramp adjustment, receive response part
*
* @param ctx The state of the library, must be connected
* @param async Information about the request
* @return Zero on success, -1 on error, in which case `ctx->error`
* (rather than `errno`) is read for information about the error
*/
int libcoopgamma_set_gamma_recv(libcoopgamma_context_t* restrict ctx,
libcoopgamma_async_context_t* restrict async)
{
size_t _n = 0;
if (check_error(ctx, async))
return -(ctx->error.custom || ctx->error.number);
while (*next_header(ctx));
(void) next_payload(ctx, &_n);
errno = EBADMSG;
copy_errno(ctx);
return -1;
}
/**
* Apply, update, or remove a gamma ramp adjustment, synchronous version
*
* This is a synchronous request function, as such,
* you have to ensure that communication is blocking
* (default), and that there are not asynchronous
* requests waiting, it also means that EINTR:s are
* silently ignored and there no wait to cancel the
* operation without disconnection from the server
*
* @param filter The filter to apply, update, or remove, gamma ramp meta-data must match the CRTC's
* @param depth The datatype for the stops in the gamma ramps, must match the CRTC's
* @param ctx The state of the library, must be connected
* @return Zero on success, -1 on error, in which case `ctx->error`
* (rather than `errno`) is read for information about the error
*/
int libcoopgamma_set_gamma_sync(libcoopgamma_filter_t* restrict filter, libcoopgamma_depth_t depth,
libcoopgamma_context_t* restrict ctx)
{
SYNC_CALL(libcoopgamma_set_gamma_send(filter, depth, ctx, &async),
libcoopgamma_set_gamma_recv(ctx, &async), -1);
}
#if defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
