projet-systeme-exploitation.../minishell.c
Laureηt ab6da28992 v1
2021-04-20 18:12:44 +02:00

102 lines
2.3 KiB
C

#define _GNU_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <setjmp.h>
#include "readcmd.h"
#include "jobs.h"
int prompting = 0;
int job_id = 1;
list jobs;
void handler_print(int signal_num, siginfo_t* info) {
if (contiens(&jobs, info->si_pid)) {
if (prompting) { printf("\n"); }
printf("[%d] --> (%d) %s\n", info->si_pid, signal_num, strsignal(signal_num));
supprimer(&jobs, info->si_pid);
job_id--;
}
}
int main(int argc, char *argv[]) {
extern int errno;
initialiser(&jobs);
struct sigaction action;
action.sa_flags = SA_SIGINFO; //| SA_RESTART;
action.sa_handler = handler_print;
sigemptyset(&action.sa_mask);
sigaction(SIGCHLD, &action, NULL);
char initcd[256], currentcd[256];
getcwd(initcd, 256);
while (1) {
getcwd(currentcd, 256);
printf("%s >>> ", currentcd);
prompting = 1;
struct cmdline* cmd = readcmd();
prompting = 0;
if (cmd == NULL || cmd->seq[0] == NULL) { // ligne vide, on skip
continue;
} else if (!strcmp(cmd->seq[0][0], "exit")) { // on quitte le shell
break;
} else if (!strcmp(cmd->seq[0][0], "cd")) { // cd
if (cmd->seq[0][1] == NULL) { // vide
chdir(initcd);
} else { // avec un path
chdir(cmd->seq[0][1]);
}
continue;
} else if (!strcmp(cmd->seq[0][0], "jobs")) {
afficher(&jobs);
continue;
}
pid_t pidFils = fork();
if (pidFils == -1) {
fprintf(stderr, "ERROR: forking failed, %s\n", strerror(errno));
exit(errno);
}
if (pidFils == 0) { // fils
execvp(cmd->seq[0][0], cmd->seq[0]);
exit(errno); // si execlp échoue on exit avec une erreur
} else { // père
if (cmd->backgrounded) {
ajouter(&jobs, pidFils, job_id++);
} else {
jmp_buf env;
setjmp(env);
int codeTerm;
pid_t idFils = waitpid(pidFils, &codeTerm, 0); // on attend la fin de l'exec du fils
if (idFils == -1){
// todo : peut mieux faire ?
if (errno == 4) {
longjmp(env, 1);
}
fprintf(stderr, "ERROR: waiting for %d failed, (%d) %s\n", codeTerm, errno, strerror(errno));
exit(errno);
}
}
}
}
return EXIT_SUCCESS;
}