| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <unistd.h> |
| 4 | #include <string.h> |
| 5 | #include <sys/mman.h> |
| 6 | #include <sys/stat.h> |
| 7 | #include <sys/types.h> |
| 8 | #include <fcntl.h> |
| 9 | |
| 10 | #define nbchar 4096 |
| 11 | |
| 12 | int main() |
| 13 | { |
| 14 | int fd, res; |
| 15 | char *partage = NULL; |
| 16 | char *message = ""; |
| 17 | fd = shm_open("partage.mem", O_RDWR | O_CREAT, 0600); /* ouverture du segment partagé */ |
| 18 | if (fd == -1) { /* et création du nom (du fichier) */ |
| 19 | perror("shm_open"); |
| 20 | exit(1); |
| 21 | } |
| 22 | res = ftruncate(fd, nbchar); /* choix de la taille du segment */ |
| 23 | if (res == -1) { |
| 24 | perror("ftruncate"); |
| 25 | exit(1); |
| 26 | } |
| 27 | partage = (char *)mmap(NULL, nbchar, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
| 28 | if (partage == MAP_FAILED) { |
| 29 | perror("mmap"); |
| 30 | exit(1); |
| 31 | } |
| 32 | strncpy(partage, message, nbchar); |
| 33 | while (strcmp(partage, message) == 0) { |
| 34 | sleep(1); |
| 35 | } |
| 36 | fprintf(stdout, "la réponse est %s\n", partage); |
| 37 | res = munmap(partage, nbchar); |
| 38 | if (res == -1) { |
| 39 | perror("munmap"); |
| 40 | exit(1); |
| 41 | } |
| 42 | close(fd); /* fermeture du fichier */ |
| 43 | res = shm_unlink("partage.mem"); /* suppression du nom */ |
| 44 | if (res == -1) { |
| 45 | perror("shm_unlink"); |
| 46 | exit(1); |
| 47 | } |
| 48 | return 0; |
| 49 | } |