IML TD(take2):

[TD_IML.git] / TD1 / part_two / exo.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <sys/types.h>
#include <sys/wait.h>

void show_proc_pids() {
    pid_t current_pid = getpid();
    pid_t parent_pid = getppid();

    printf("[%d] Mon PID: %d\n", current_pid, current_pid);
    printf("[%d] PID du parent: %d\n", current_pid, parent_pid);
}

int main() {
    int pipefd[2];
    char buf;
    printf("Courant:\n");
    show_proc_pids();

    if (pipe(pipefd) == -1) {
        printf("Pipe creation erreur\n");
        exit(EXIT_FAILURE);
    };

    pid_t cpid = fork();

    if (cpid == -1) {
        printf("Erreur de clonage\n");
        exit(EXIT_FAILURE);
    } else if (cpid == 0) {
        printf("Fils:\n");
        show_proc_pids();
        const char* str_fmt = "[%d] Coucou papa !\n";
        close(pipefd[0]);
        write(pipefd[1], str_fmt, strlen(str_fmt));
        close(pipefd[1]);
        exit(EXIT_SUCCESS);
    } else {
        printf("Parent:\n");
        show_proc_pids();
        close(pipefd[1]);
        read(pipefd[0], &buf, 20*sizeof(buf));
        printf(&buf, getpid());
        close(pipefd[0]);
        wait(NULL);
        exit(EXIT_SUCCESS);
    }

    /* unreachable code */
    return EXIT_SUCCESS;
}