TD IML:

[TD_IML.git] / TD2 / exercise3 / exercise.c

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

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

int main() {
    int pipefd[2];
    char tmpbuf;

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

    pid_t cpid = fork();

    if (cpid == -1) {
        perror("fork failure\n");
        exit(EXIT_FAILURE);
    } else if (cpid == 0) {
        close(pipefd[0]);
        dup2(pipefd[1], STDOUT_FILENO);
        execl("/bin/ls", "ls", (char*)NULL);
        close(pipefd[1]);
        exit(EXIT_SUCCESS);
    } else {
        close(pipefd[1]);
        printf("[%d] REDIRECTION: \n", getpid());
        //determine the pipe size to avoid this kind of code 
        while (read(pipefd[0], &tmpbuf, 1) > 0) {
            write(STDOUT_FILENO, &tmpbuf, 1);
        }
        close(pipefd[0]);
        wait(NULL);
    }

    return EXIT_SUCCESS;
}