141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
#define _GNU_SOURCE
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <string.h>
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#include <signal.h>
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#include <errno.h>
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#include <setjmp.h>
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#include "readcmd.h"
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#include "jobs.h"
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int prompting = 0;
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int job_id = 1;
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list jobs;
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void handler_print(int signal_num, siginfo_t *info)
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{
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if (contiens(&jobs, info->si_pid))
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{ // pid dans la lsite des proccess en fond
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if (prompting)
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{ // si il n'y a pas d'execution de procces actuellement
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printf("\n");
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}
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printf("[%d] --> (%d) %s\n", info->si_pid, signal_num, strsignal(signal_num));
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supprimer(&jobs, info->si_pid);
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job_id--;
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}
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}
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int main(int argc, char *argv[])
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{
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extern int errno;
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initialiser(&jobs);
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// gestion de SIGCHLD
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struct sigaction action;
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action.sa_flags = SA_SIGINFO; //| SA_RESTART;
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action.sa_handler = handler_print;
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sigemptyset(&action.sa_mask);
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sigaction(SIGCHLD, &action, NULL);
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// variables de "pwd"
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char initcd[256], currentcd[256];
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getcwd(initcd, 256);
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// loop principal
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while (1)
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{
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getcwd(currentcd, 256);
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printf("%s >>> ", currentcd);
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prompting = 1;
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struct cmdline *cmd = readcmd();
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prompting = 0;
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if (cmd == NULL || cmd->seq[0] == NULL)
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{ // ligne vide, on skip
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continue;
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}
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else if (!strcmp(cmd->seq[0][0], "exit"))
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{ // on quitte le shell
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break;
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}
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else if (!strcmp(cmd->seq[0][0], "cd"))
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{ // cd
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int ret = 0;
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if (cmd->seq[0][1] == NULL)
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{ // vide
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ret = chdir(initcd);
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}
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else
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{ // avec un path
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ret = chdir(cmd->seq[0][1]);
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}
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if (ret)
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{ // si le path n'existe pas
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fprintf(stderr, "ERROR: cd failed, (%d) %s\n", errno, strerror(errno));
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}
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continue;
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}
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else if (!strcmp(cmd->seq[0][0], "jobs"))
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{ // on affiche tous les process de fond
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afficher(&jobs);
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continue;
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}
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pid_t pidFils = fork();
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if (pidFils == -1)
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{ // si le fork échoue
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fprintf(stderr, "ERROR: forking failed, (%d) %s\n", errno, strerror(errno));
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exit(errno);
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}
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if (pidFils == 0)
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{ // instructions du fils
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execvp(cmd->seq[0][0], cmd->seq[0]);
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exit(errno); // si execlp échoue on exit avec une erreur
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}
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else
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{ // instructions du père
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if (cmd->backgrounded)
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{ // on sauvegarde le pid, si background
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ajouter(&jobs, pidFils, job_id++);
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}
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else
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{ // on attend le fils, si foreground
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jmp_buf env;
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setjmp(env); // sauvegarde pour un jump
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int codeTerm;
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pid_t idFils = waitpid(pidFils, &codeTerm, 0); // on attend la fin de l'exec du fils
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if (idFils == -1)
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{ // si le wait fail
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if (errno == 4)
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{
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longjmp(env, 1); // si interruption du wait, on jump
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}
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else
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{
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fprintf(stderr, "ERROR: waiting for %d failed, (%d) %s\n", codeTerm, errno, strerror(errno));
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exit(errno);
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}
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}
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if (codeTerm)
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{ // si l'exec a échoué
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fprintf(stderr, "ERROR: %d's execution failed, (%d) %s\n", pidFils, codeTerm, strerror(codeTerm));
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}
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}
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}
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}
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return EXIT_SUCCESS;
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} |