projet-systeme-exploitation.../minishell.c.bak
2021-04-21 16:18:53 +02:00

192 lines
4.8 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;
pid_t pidFils;
struct cmdline *cmd;
jmp_buf start;
void handler_print(int signal_num, siginfo_t *info)
{
cell* job = trouver(&jobs, info->si_pid);
if (job)
{ // pid dans la lite des proccess en fond
if (job->state)
{
job->state = 0;
siglongjmp(start, signal_num);
}
if (prompting)
{ // si il n'y a pas d'execution de proccess actuellement
printf("\n");
}
printf("[%d] (%d) done: %s\n", job->id, job->pid, job->cmd);
supprimer(&jobs, job->pid);
job_id--;
if (prompting)
{ // on réaffiche un prompt si besoin
siglongjmp(start, signal_num);
}
}
}
void handler_restart(int signal_num)
{
printf("\n");
siglongjmp(start, signal_num);
}
void handler_stop(int signal_num)
{
if (!prompting)
{
kill(pidFils, SIGTSTP);
ajouter(&jobs, pidFils, job_id++, *(cmd->seq), 1);
printf("[%d] (%d) suspended: %s\n", job_id, pidFils, *(cmd->seq));
siglongjmp(start, signal_num);
}
else
{
handler_restart(signal_num);
}
}
int main(int argc, char *argv[])
{
extern int errno;
initialiser(&jobs);
// gestion des signaux
struct sigaction action;
sigemptyset(&action.sa_mask);
action.sa_flags = SA_SIGINFO | SA_RESTART;
action.sa_handler = handler_print;
sigaction(SIGCHLD, &action, NULL);
action.sa_handler = handler_restart;
sigaction(SIGINT, &action, NULL);
action.sa_handler = handler_stop;
sigaction(SIGTSTP, &action, NULL);
// variables pour afficher le path
char initcd[256], currentcd[256];
getcwd(initcd, 256);
// loop principal
while (1)
{
if (sigsetjmp(start, 1) == 2)
{ // si on provient du jump
continue;
}
getcwd(currentcd, 256);
printf("%s >>> ", currentcd);
prompting = 1;
cmd = readcmd();
prompting = 0;
if (cmd == NULL)
{ // on quitte le shell, EOF
break;
}
else if (cmd->seq[0] == NULL)
{ // ligne vide, on skip
continue;
}
else if (!strcmp(cmd->seq[0][0], "bg"))
{
kill(pidFils, SIGCONT);
continue;
}
else if (!strcmp(cmd->seq[0][0], "exit"))
{
break;
}
else if (!strcmp(cmd->seq[0][0], "cd"))
{ // cd
int ret = 0;
if (cmd->seq[0][1] == NULL)
{ // vide, sans path
ret = chdir(initcd);
}
else
{ // avec un path
ret = chdir(cmd->seq[0][1]);
}
if (ret)
{ // si le path n'existe pas
fprintf(stderr, "ERROR: cd failed, (%d) %s\n", errno, strerror(errno));
}
continue;
}
else if (!strcmp(cmd->seq[0][0], "jobs"))
{ // on affiche tous les process de fond
afficher(&jobs);
continue;
}
pidFils = fork();
if (pidFils == -1)
{ // si le fork échoue
fprintf(stderr, "ERROR: forking failed, (%d) %s\n", errno, strerror(errno));
exit(errno);
}
if (pidFils == 0)
{ // instructions du fils
if (cmd->backgrounded)
{
action.sa_handler = SIG_IGN;
sigaction(SIGINT, &action, NULL); // on ignore SIGINT
}
execvp(cmd->seq[0][0], cmd->seq[0]);
exit(errno); // si execlp échoue on exit avec une erreur
}
else
{ // instructions du père
if (cmd->backgrounded)
{ // on sauvegarde le pid, si background
ajouter(&jobs, pidFils, job_id++, *(cmd->seq), 0);
printf("[%d] %d\n", job_id, pidFils);
}
else
{ // on attend le fils, si foreground
int codeTerm;
pid_t idFils = waitpid(pidFils, &codeTerm, 0); // on attend la fin de l'exec du fils
if (idFils == -1)
{ // si le wait fail
fprintf(stderr, "ERROR: waiting for %d failed, (%d) %s\n", codeTerm, errno, strerror(errno));
exit(errno);
}
if (codeTerm)
{ // si l'exec a échoué
fprintf(stderr, "ERROR: %d's execution failed, (%d) %s\n", pidFils, codeTerm, strerror(codeTerm));
}
}
}
}
liberer(&jobs);
return EXIT_SUCCESS;
}