| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <string.h> |
| 4 | #include <unistd.h> |
| 5 | |
| 6 | #include <sys/types.h> |
| 7 | #include <sys/wait.h> |
| 8 | |
| 9 | void show_proc_pids() { |
| 10 | pid_t current_pid = getpid(); |
| 11 | pid_t parent_pid = getppid(); |
| 12 | |
| 13 | printf("[%d] Mon PID: %d\n", current_pid, current_pid); |
| 14 | printf("[%d] PID du parent: %d\n", current_pid, parent_pid); |
| 15 | } |
| 16 | |
| 17 | int main() { |
| 18 | int pipefd[2]; |
| 19 | char buf; |
| 20 | printf("Courant:\n"); |
| 21 | show_proc_pids(); |
| 22 | |
| 23 | if (pipe(pipefd) == -1) { |
| 24 | printf("Pipe creation erreur\n"); |
| 25 | exit(EXIT_FAILURE); |
| 26 | }; |
| 27 | |
| 28 | pid_t cpid = fork(); |
| 29 | |
| 30 | if (cpid == -1) { |
| 31 | printf("Erreur de clonage\n"); |
| 32 | exit(EXIT_FAILURE); |
| 33 | } else if (cpid == 0) { |
| 34 | printf("Fils:\n"); |
| 35 | show_proc_pids(); |
| 36 | const char* str_fmt = "[%d] Coucou papa !\n"; |
| 37 | close(pipefd[0]); |
| 38 | write(pipefd[1], str_fmt, strlen(str_fmt)); |
| 39 | close(pipefd[1]); |
| 40 | exit(EXIT_SUCCESS); |
| 41 | } else { |
| 42 | printf("Parent:\n"); |
| 43 | show_proc_pids(); |
| 44 | close(pipefd[1]); |
| 45 | read(pipefd[0], &buf, 20*sizeof(buf)); |
| 46 | printf(&buf, getpid()); |
| 47 | close(pipefd[0]); |
| 48 | wait(NULL); |
| 49 | exit(EXIT_SUCCESS); |
| 50 | } |
| 51 | |
| 52 | /* unreachable code */ |
| 53 | return EXIT_SUCCESS; |
| 54 | } |