projet-systeme-exploitation.../minishell.c

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#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"
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extern int errno;
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struct cmdline *cmd;
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int pid_fils;
int job_id = 0;
list jobs;
int prompting = 0;
jmp_buf goto_prompt;
char initcd[256], currentcd[256];
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void handler_sigchld(int sig_num, siginfo_t *info)
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{
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cell *job = trouver(&jobs, info->si_pid);
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if (job)
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{
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if (prompting)
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{
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printf("\n");
}
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printf("[%d] %d done: %s\n", job->id, job->pid, job->cmd);
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supprimer(&jobs, job->pid);
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job_id--;
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if (prompting)
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{
siglongjmp(goto_prompt, sig_num);
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}
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}
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}
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void handler_sigint(int sig_num)
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{
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printf("\n");
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siglongjmp(goto_prompt, sig_num);
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}
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void handler_sigtstp(int sig_num)
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{
if (!prompting)
{
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kill(pid_fils, SIGTSTP);
ajouter(&jobs, pid_fils, ++job_id, *(cmd->seq), 1);
printf("[%d] %d suspended\n", job_id, pid_fils);
siglongjmp(goto_prompt, sig_num);
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}
else
{
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handler_sigint(sig_num);
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}
}
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void handler_sigcont(int sig_num)
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{
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}
int main(int argc, char *argv[])
{
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initialiser(&jobs);
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getcwd(initcd, sizeof(initcd));
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// gestion des signaux
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struct sigaction action;
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sigemptyset(&action.sa_mask);
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action.sa_flags = SA_SIGINFO | SA_RESTART;
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action.sa_handler = handler_sigchld;
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sigaction(SIGCHLD, &action, NULL);
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action.sa_handler = handler_sigint;
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sigaction(SIGINT, &action, NULL);
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action.sa_handler = handler_sigtstp;
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sigaction(SIGTSTP, &action, NULL);
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// loop principal
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while (1)
{
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sigsetjmp(goto_prompt, 1);
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prompting = 1;
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getcwd(currentcd, sizeof(currentcd));
printf("%s >>> ", currentcd);
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cmd = readcmd();
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prompting = 0;
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if (cmd == NULL)
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{ // EOF
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break;
}
else if (cmd->seq[0] == NULL)
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{ // empty
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continue;
}
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else if (!strcmp(cmd->seq[0][0], "exit"))
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{ // "exit"
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break;
}
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else if (!strcmp(cmd->seq[0][0], "jobs"))
{ // "jobs"
afficher(&jobs);
continue;
}
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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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{ // no path
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ret = chdir(initcd);
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}
else
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{ // with 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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{ // wrong path
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fprintf(stderr, "ERROR: cd failed, (%d) %s\n", errno, strerror(errno));
}
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continue;
}
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pid_fils = fork();
if (pid_fils == -1)
{ // fork fail ?
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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 (pid_fils == 0)
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{ // instructions du fils
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action.sa_handler = SIG_DFL;
sigaction(SIGTSTP, &action, NULL); // on default SIGTSTP
sigaction(SIGCONT, &action, NULL); // on default SIGCONT
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if (cmd->backgrounded)
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{ // background
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action.sa_handler = SIG_IGN;
sigaction(SIGINT, &action, NULL); // on ignore SIGINT
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sigaction(SIGTSTP, &action, NULL); // on ignore SIGTSTP
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}
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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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else
{ // instructions du père
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if (cmd->backgrounded)
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{ // background
ajouter(&jobs, pid_fils, ++job_id, *(cmd->seq), 0);
printf("[%d] %d\n", job_id, pid_fils);
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}
else
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{ // foreground
int wait_code;
pid_t id_fils = waitpid(pid_fils, &wait_code, 0); // on attend la fin de l'exec du fils
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if (id_fils == -1)
{ // wait fail ?
fprintf(stderr, "ERROR: waiting for %d failed, (%d) %s\n", wait_code, errno, strerror(errno));
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exit(errno);
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}
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if (wait_code)
{ // execvp fail ?
fprintf(stderr, "ERROR: %d's execution failed, (%d) %s\n", pid_fils, wait_code, strerror(wait_code));
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}
}
}
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}
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return EXIT_SUCCESS;
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}