65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
#ifndef LIBRARIES
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#define LIBRARIES
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#define _GNU_SOURCE
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#include <fcntl.h> ///< For O_* constants *
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#endif
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#define BUFFER_SHM_NAME "/11777707_buff"
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int create_shmfd(char *shm_name) {
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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\n");
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exit(EXIT_FAILURE);
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}
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return shmfd;
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}
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void truncate_shm(int shmfd, size_t shm_size) {
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if(ftruncate(shmfd, shm_size) < 0) {
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fprintf(stderr, "ERROR: Failed truncating shared memory object\n");
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exit(EXIT_FAILURE);
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}
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}
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void* open_shm(int shmfd, size_t shm_size) {
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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\n");
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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\n");
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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, int shmfd) {
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if (shm_unlink(shm_name) == -1) {
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fprintf(stderr, "ERROR: Failed unlinking shared memory object\n");
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exit(EXIT_FAILURE);
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}
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if(close(shmfd) < 0) {
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fprintf(stderr, "ERROR: Failed closing file descriptor\n");
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exit(EXIT_FAILURE);
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}
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}
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