/**
* coopgammad -- Cooperative gamma server
* Copyright (C) 2016 Mattias Andrée (maandree@kth.se)
*
* This program 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 program 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "state.h"
#include "util.h"
#include <stdlib.h>
#include <string.h>
/**
* The name of the process
*/
char* restrict argv0; /* do not marshal */
/**
* The real pathname of the process's binary,
* `NULL` if `argv0` is satisfactory
*/
char* restrict argv0_real = NULL;
/**
* Array of all outputs
*/
struct output* restrict outputs = NULL;
/**
* The nubmer of elements in `outputs`
*/
size_t outputs_n = 0;
/**
* The server socket's file descriptor
*/
int socketfd = -1;
/**
* Has the process receive a signal
* telling it to re-execute?
*/
volatile sig_atomic_t reexec = 0; /* do not marshal */
/**
* Has the process receive a signal
* telling it to terminate?
*/
volatile sig_atomic_t terminate = 0; /* do not marshal */
/**
* Has the process receive a to
* disconnect from or reconnect to
* the site? 1 if disconnct, 2 if
* reconnect, 0 otherwise.
*/
volatile sig_atomic_t connection = 0;
/**
* List of all client's file descriptors
*
* Unused slots, with index less than `connections_used`,
* should have the value -1 (negative)
*/
int* restrict connections = NULL;
/**
* The number of elements allocated for `connections`
*/
size_t connections_alloc = 0;
/**
* The index of the first unused slot in `connections`
*/
size_t connections_ptr = 0;
/**
* The index of the last used slot in `connections`, plus 1
*/
size_t connections_used = 0;
/**
* The clients' connections' inbound-message buffers
*/
struct message* restrict inbound = NULL;
/**
* The clients' connections' outbound-message buffers
*/
struct ring* restrict outbound = NULL;
/**
* Is the server connect to the display?
*
* Set to true before the initial connection
*/
int connected = 1;
/**
* The adjustment method, -1 for automatic
*/
int method = -1;
/**
* The site's name, may be `NULL`
*/
char* restrict sitename = NULL;
/**
* The libgamma site state
*/
libgamma_site_state_t site; /* do not marshal */
/**
* The libgamma partition states
*/
libgamma_partition_state_t* restrict partitions = NULL; /* do not marshal */
/**
* The libgamma CRTC states
*/
libgamma_crtc_state_t* restrict crtcs = NULL; /* do not marshal */
/**
* Destroy the state
*/
void state_destroy(void)
{
size_t i;
for (i = 0; i < connections_used; i++)
if (connections[i] >= 0)
{
message_destroy(inbound + i);
ring_destroy(outbound + i);
}
free(inbound);
free(outbound);
free(connections);
if (outputs != NULL)
for (i = 0; i < outputs_n; i++)
output_destroy(outputs + i);
free(outputs);
if (crtcs != NULL)
for (i = 0; i < outputs_n; i++)
libgamma_crtc_destroy(crtcs + i);
free(crtcs);
if (partitions != NULL)
for (i = 0; i < site.partitions_available; i++)
libgamma_partition_destroy(partitions + i);
free(partitions);
libgamma_site_destroy(&site);
free(argv0_real);
free(sitename);
}
#if defined(__clang__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wcast-align"
#endif
/**
* Marshal the state
*
* @param buf Output buffer for the marshalled data,
* `NULL` to only measure how many bytes
* this buffer needs
* @return The number of marshalled bytes
*/
size_t state_marshal(void* restrict buf)
{
size_t off = 0, i, n;
char* restrict bs = buf;
if (argv0_real == NULL)
{
if (bs != NULL)
*(bs + off) = '\0';
off += 1;
}
else
{
n = strlen(argv0_real) + 1;
if (bs != NULL)
memcpy(bs + off, argv0_real, n);
off += n;
}
if (bs != NULL)
*(size_t*)(bs + off) = outputs_n;
off += sizeof(size_t);
for (i = 0; i < outputs_n; i++)
off += output_marshal(outputs + i, bs ? bs + off : NULL);
if (bs != NULL)
*(int*)(bs + off) = socketfd;
off += sizeof(int);
if (bs != NULL)
*(sig_atomic_t*)(bs + off) = connection;
off += sizeof(sig_atomic_t);
if (bs != NULL)
*(int*)(bs + off) = connected;
off += sizeof(int);
if (bs != NULL)
*(size_t*)(bs + off) = connections_ptr;
off += sizeof(size_t);
if (bs != NULL)
*(size_t*)(bs + off) = connections_used;
off += sizeof(size_t);
if (bs != NULL)
memcpy(bs + off, connections, connections_used * sizeof(*connections));
off += connections_used * sizeof(*connections);
for (i = 0; i < connections_used; i++)
if (connections[i] >= 0)
{
off += message_marshal(inbound + i, bs ? bs + off : NULL);
off += ring_marshal(outbound + i, bs ? bs + off : NULL);
}
if (bs != NULL)
*(int*)(bs + off) = method;
off += sizeof(int);
if (bs != NULL)
*(int*)(bs + off) = sitename != NULL;
off += sizeof(int);
if (sitename != NULL)
{
n = strlen(sitename) + 1;
if (bs != NULL)
memcpy(bs + off, sitename, n);
off += n;
}
return off;
}
/**
* Unmarshal the state
*
* @param buf Buffer for the marshalled data
* @return The number of unmarshalled bytes, 0 on error
*/
size_t state_unmarshal(const void* restrict buf)
{
size_t off = 0, i, n;
const char* restrict bs = buf;
connections = NULL;
inbound = NULL;
if (*(bs + off))
{
off += 1;
n = strlen(bs + off) + 1;
if (!(argv0_real = memdup(bs + off, n)))
return 0;
off += n;
}
else
off += 1;
outputs_n = *(const size_t*)(bs + off);
off += sizeof(size_t);
for (i = 0; i < outputs_n; i++)
{
off += n = output_unmarshal(outputs + i, bs + off);
if (n == 0)
return 0;
}
socketfd = *(const int*)(bs + off);
off += sizeof(int);
connection = *(const sig_atomic_t*)(bs + off);
off += sizeof(sig_atomic_t);
connected = *(const int*)(bs + off);
off += sizeof(int);
connections_ptr = *(const size_t*)(bs + off);
off += sizeof(size_t);
connections_alloc = connections_used = *(const size_t*)(bs + off);
off += sizeof(size_t);
if (connections_alloc > 0)
{
connections = memdup(bs + off, connections_alloc * sizeof(*connections));
if (connections == NULL)
return 0;
off += connections_used * sizeof(*connections);
inbound = malloc(connections_alloc * sizeof(*inbound));
if (inbound == NULL)
return 0;
}
for (i = 0; i < connections_used; i++)
if (connections[i] >= 0)
{
off += n = message_unmarshal(inbound + i, bs + off);
if (n == 0)
return 0;
off += n = ring_unmarshal(outbound + i, bs + off);
if (n == 0)
return 0;
}
method = *(const int*)(bs + off);
off += sizeof(int);
if (*(const int*)(bs + off))
{
off += sizeof(int);
n = strlen(bs + off) + 1;
if (!(sitename = memdup(bs + off, n)))
return 0;
off += n;
}
else
off += sizeof(int);
return off;
}
#if defined(__clang__)
# pragma GCC diagnostic pop
#endif
