53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
#define _GNU_SOURCE
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <string.h>
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#define TERMINATE_SHM "/terminate"
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#define TERMINATE_SHM_SIZE 8
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void* open_shm(char *shm_name, size_t shm_size) {
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int shmfd = shm_open(shm_name, O_RDWR | O_CREAT, 0600);
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if(shmfd == -1) {
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fprintf(stderr, "ERROR: Failed creating shared memory object");
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exit(EXIT_FAILURE);
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}
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if(ftruncate(shmfd, shm_size) < 0) {
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fprintf(stderr, "ERROR: Failed truncating shared memory object");
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exit(EXIT_FAILURE);
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}
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void* shm;
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shm = mmap(NULL, shm_size, PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0);
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if(shm == MAP_FAILED) {
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fprintf(stderr, "ERROR: Failed mapping shared memory object");
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exit(EXIT_FAILURE);
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}
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return shm;
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}
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void write_to_shm(void* shm, char *message, size_t message_size) {
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memcpy(shm, message, message_size);
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}
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void close_shm(void* shm, size_t shm_size) {
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if (munmap(shm, shm_size) == -1) {
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fprintf(stderr, "ERROR: Failed unmapping shared memory object");
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exit(EXIT_FAILURE);
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}
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}
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void destroy_shm(char *shm_name) {
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if (shm_unlink(shm_name) == -1) {
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fprintf(stderr, "ERROR: Failed unlinking shared memory object");
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exit(EXIT_FAILURE);
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}
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}
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