diff options
Diffstat (limited to 'src/libcoopgamma.c')
| -rw-r--r-- | src/libcoopgamma.c | 430 |
1 files changed, 330 insertions, 100 deletions
diff --git a/src/libcoopgamma.c b/src/libcoopgamma.c index b7debc9..1d7efa1 100644 --- a/src/libcoopgamma.c +++ b/src/libcoopgamma.c @@ -109,11 +109,12 @@ char* argv0 __attribute__((weak)) = "libcoopgamma"; #define copy_errno(ctx) \ - ((ctx)->error.number = (uint64_t)errno, \ - (ctx)->error.custom = 0, \ - (ctx)->error.server_side = 0, \ - free((ctx)->error.description), \ - (ctx)->error.description = NULL) + ((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)) @@ -755,6 +756,14 @@ int libcoopgamma_context_initialise(libcoopgamma_context_t* restrict this) this->fd = -1; libcoopgamma_error_initialise(&(this->error)); this->message_id = 0; + this->outbound = NULL; + this->outbound_head = 0; + this->outbound_tail = 0; + this->outbound_size = 0; + this->inbound = NULL; + this->inbound_head = 0; + this->inbound_tail = 0; + this->inbound_size = 0; return 0; } @@ -778,6 +787,8 @@ void libcoopgamma_context_destroy(libcoopgamma_context_t* restrict this, int dis } this->fd = -1; libcoopgamma_error_destroy(&(this->error)); + free(this->outbound), this->outbound = NULL; + free(this->inbound), this->inbound = NULL; } @@ -797,6 +808,10 @@ size_t libcoopgamma_context_marshal(const libcoopgamma_context_t* restrict this, 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_EPILOGUE; } @@ -824,6 +839,78 @@ int libcoopgamma_context_unmarshal(libcoopgamma_context_t* restrict this, 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_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; + 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 + */ +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_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_EPILOGUE; } @@ -1182,6 +1269,44 @@ int libcoopgamma_connect(const char* restrict method, const char* restrict site, /** + * 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 initialised + * @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; +} + + +/** * Send a message to the server and wait for response * * @param resp:char** Output parameter for the response, @@ -1192,26 +1317,24 @@ int libcoopgamma_connect(const char* restrict method, const char* restrict site, * @param format:string-literal Message formatting string * @param ... Message formatting arguments * - * On and only on error, `*(resp)` is set to `NULL` + * On error, the macro goes to `fail`. */ -#define communicate(respp, ctx, payload, payload_size, format, ...) \ - do \ - { \ - ssize_t n__; \ - char* msg__; \ - snprintf(NULL, 0, format "%zn", __VA_ARGS__, &n__); \ - msg__ = malloc((size_t)n__ + (payload_size)); \ - if (msg__ == NULL) \ - { \ - copy_errno(ctx); \ - *(respp) = NULL; \ - break; \ - } \ - sprintf(msg__, format, __VA_ARGS__); \ - if ((payload) != NULL) \ - memcpy(msg__ + n__, (payload), (payload_size)); \ - *(respp) = (communicate)((ctx), msg__, (size_t)n__ + (payload_size)); \ - } \ +#define SEND_MESSAGE(ctx, payload, payload_size, format, ...) \ + do \ + { \ + ssize_t n__; \ + char* msg__; \ + snprintf(NULL, 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) @@ -1221,109 +1344,181 @@ int libcoopgamma_connect(const char* restrict method, const char* restrict site, * @param ctx The state of the library * @param msg The message to send * @param n The length of `msg` - * @return NUL-terminated response, `NULL` on error + * @return Zero on success, -1 on error */ -static char* (communicate)(libcoopgamma_context_t* restrict ctx, char* msg, size_t n) +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); +} + + +static char* next_line(libcoopgamma_context_t* restrict ctx) { } /** - * List all available CRTC:s + * 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 - * @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. + * @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 */ -char** libcoopgamma_get_crtcs(libcoopgamma_context_t* restrict ctx) +int libcoopgamma_get_crtcs_send(libcoopgamma_context_t* restrict ctx, + libcoopgamma_async_context_t* restrict async) { - char* resp; + async->message_id = ctx->message_id; + SEND_MESSAGE(ctx, NULL, 0, + "Command: enumerate-crtcs\n" + "Message ID: %" PRIu32 "\n" + "\n", + ctx->message_id); - communicate(&resp, ctx, NULL, 0, - "Command: enumerate-crtcs\n" - "Message ID: %" PRIu32 "\n" - "\n", - ctx->message_id); + return 0; + fail: + copy_errno(ctx); + return -1; } /** - * Retrieve information about a CRTC:s gamma ramps + * List all available CRTC:s, receive response part * - * Cannot be used before connecting to the serve + * @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) +{ +} + + +/** + * 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 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 + * @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(const char* crtc, libcoopgamma_crtc_info_t* restrict info, - libcoopgamma_context_t* restrict ctx) +int libcoopgamma_get_gamma_info_send(const char* crtc, libcoopgamma_context_t* restrict ctx, + libcoopgamma_async_context_t* restrict async) { - char* resp; - if ((crtc == NULL) || strchr(crtc, '\n')) { errno = EINVAL; goto fail; } - communicate(&resp, ctx, NULL, 0, - "Command: get-gamma-info\n" - "Message ID: %" PRIu32 "\n" - "CRTC: %s\n" - "\n", - ctx->message_id, crtc); - if (resp == NULL) - return -1; + async->message_id = ctx->message_id; + SEND_MESSAGE(ctx, NULL, 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 -1; + return 0; } /** - * Retrieve the current gamma ramp adjustments + * Retrieve information about a CRTC:s gamma ramps, receive response part * - * Cannot be used before connecting to the serve - * - * @param query The query to send - * @param table Output for the response, must be initialised + * @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(libcoopgamma_filter_query_t* restrict query, - libcoopgamma_filter_table_t* restrict table, libcoopgamma_context_t* restrict ctx) +int libcoopgamma_get_gamma_info_recv(libcoopgamma_crtc_info_t* restrict info, + libcoopgamma_context_t* restrict ctx, + libcoopgamma_async_context_t* restrict async) +{ +} + + +/** + * 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) { - char* resp; - if ((query == NULL) || (query->crtc == NULL) || strchr(query->crtc, '\n')) { errno = EINVAL; goto fail; } - communicate(&resp, ctx, NULL, 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); - if (resp == NULL) - return -1; + async->message_id = ctx->message_id; + SEND_MESSAGE(ctx, NULL, 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; @@ -1331,23 +1526,43 @@ int libcoopgamma_get_gamma(libcoopgamma_filter_query_t* restrict query, /** - * Apply, update, or remove a gamma ramp adjustment + * 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, that is needed to + * identify and parse the response, is stored here + * @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) +{ +} + + +/** + * 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 - * @return Zero on success, -1 on error, in which case `ctx->error` - * (rather than `errno`) is read for information about the error + * @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(libcoopgamma_filter_t* restrict filter, libcoopgamma_depth_t depth, - libcoopgamma_context_t* restrict ctx) +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; - char* resp; if ((filter == NULL) || (filter->crtc == NULL) || strchr(filter->crtc, '\n') || (filter->class == NULL) || strchr(filter->class, '\n')) @@ -1391,22 +1606,37 @@ int libcoopgamma_set_gamma(libcoopgamma_filter_t* restrict filter, libcoopgamma_ sprintf(length, "Length: %zu\n", payload_size); } - communicate(&resp, 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); - if (resp == NULL) - return -1; + 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, that is needed to + * identify and parse the response, is stored here + * @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) +{ +} + |