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/*
Copyright (C) 2023 Grok Image Compression Inc.
This file is part of DCP-o-matic.
DCP-o-matic 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 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "context.h"
#include "messenger.h"
#include "shm.h"
bool
grk_plugin::init_shm(char const* name, size_t len, int* shm_fd, char** buffer)
{
*shm_fd = shm_open(name, O_CREAT | O_RDWR, 0666);
if (*shm_fd < 0) {
getGrokLogger()->error("Error opening shared memory: %s", strerror(errno));
return false;
}
int rc = ftruncate(*shm_fd, sizeof(char) * len);
if (rc) {
getGrokLogger()->error("Error truncating shared memory: %s", strerror(errno));
if (close(*shm_fd)) {
getGrokLogger()->error("Error closing shared memory: %s", strerror(errno));
}
rc = shm_unlink(name);
if (rc && errno != ENOENT) {
getGrokLogger()->error("Error unlinking shared memory: %s", strerror(errno));
}
return false;
}
*buffer = static_cast<char*>(mmap(0, len, PROT_WRITE, MAP_SHARED, *shm_fd, 0));
if (!*buffer) {
getGrokLogger()->error("Error mapping shared memory: %s", strerror(errno));
if (close(*shm_fd)) {
getGrokLogger()->error("Error closing shared memory: %s", strerror(errno));
}
rc = shm_unlink(name);
if (rc && errno != ENOENT) {
getGrokLogger()->error("Error unlinking shared memory: %s", strerror(errno));
}
}
return *buffer != nullptr;
}
bool
grk_plugin::deinit_shm(char const* name, size_t len, int &shm_fd, char** buffer)
{
if (!*buffer || !shm_fd) {
return true;
}
int rc = munmap(*buffer, len);
*buffer = nullptr;
if (rc) {
getGrokLogger()->error("Error unmapping shared memory %s: %s", name, strerror(errno));
}
rc = close(shm_fd);
shm_fd = 0;
if (rc) {
getGrokLogger()->error("Error closing shared memory %s: %s", name, strerror(errno));
}
rc = shm_unlink(name);
if (rc && errno != ENOENT) {
getGrokLogger()->error("Error unlinking shared memory %s : %s", name, strerror(errno));
}
return true;
}
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