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#include "shm.h"
#include "util.h"
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ipc.h>
#include <sys/mman.h>
#include <sys/shm.h>
void *shm_create(size_t size) {
int shm_id =
shmget(IPC_PRIVATE, size, IPC_CREAT | IPC_EXCL | S_IRUSR | S_IWUSR);
if (shm_id < 0) { FFATAL("shm_id < 0 - errno: %d\n", errno); }
void *addr = shmat(shm_id, NULL, 0);
if (addr == MAP_FAILED) { FFATAL("addr == MAP_FAILED - errno: %d\n", errno); }
/*
* Configure the shared memory region to be removed once the process
* dies.
*/
if (shmctl(shm_id, IPC_RMID, NULL) < 0) {
FFATAL("shmctl (IPC_RMID) < 0 - errno: %d\n", errno);
}
/* Clear it, not sure it's necessary, just seems like good practice */
memset(addr, '\0', size);
return addr;
}
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