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>
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#include <fcntl.h>
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#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, wait_code;
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list jobs;
int prompting = 0;
jmp_buf goto_prompt;
char initcd[256], currentcd[256];
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int file_in, file_out;
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void handler_sigchld(int sig_num)
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{
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do
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{
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pid_fils = waitpid(-1, &wait_code, WNOHANG | WUNTRACED | WCONTINUED);
if ((pid_fils == -1) && (errno != ECHILD))
{ // wait fail ?
fprintf(stderr, "ERROR: waiting for child failed, (%d) %s\n", errno, strerror(errno));
exit(errno);
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}
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cell *job = trouver(&jobs, pid_fils);
if (job != NULL)
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{
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if (prompting)
{
printf("\n");
}
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if (WIFSTOPPED(wait_code))
{
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printf("[%d] %d stopped: %s\n", job->id, job->pid, job->cmd);
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}
else if (WIFCONTINUED(wait_code))
{
printf("[%d] %d continued: %s\n", job->id, job->pid, job->cmd);
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if (!strcmp(cmd->seq[0][0], "fg"))
{
supprimer(&jobs, job->pid);
}
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}
else if (WIFEXITED(wait_code))
{
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printf("[%d] %d exited: %s\n", job->id, job->pid, job->cmd);
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supprimer(&jobs, job->pid);
}
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else if (wait_code == SIGKILL)
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{
printf("[%d] %d killed: %s\n", job->id, job->pid, job->cmd);
supprimer(&jobs, job->pid);
}
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}
} while (pid_fils > 0);
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if (prompting)
{
siglongjmp(goto_prompt, sig_num);
}
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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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if (!prompting)
{
kill(pid_fils, SIGKILL);
pause();
}
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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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{
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printf("\n");
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if (!prompting)
{
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ajouter(&jobs, pid_fils, *(cmd->seq));
kill(pid_fils, SIGSTOP);
pause();
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}
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siglongjmp(goto_prompt, 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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// main loop
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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;
}
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else if (cmd->err)
{ // error from readcmd
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fprintf(stderr, "ERROR: readcmd failed, %s\n", cmd->err);
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continue;
}
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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;
}
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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else if (!strcmp(cmd->seq[0][0], "jobs"))
{ // "jobs"
afficher(&jobs);
continue;
}
else if (!strcmp(cmd->seq[0][0], "bg"))
{ // "bg"
cell *job;
if (cmd->seq[0][1] == NULL)
{ // no id
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fprintf(stderr, "ERROR: id missing\n");
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continue;
}
else
{ // id specified
job = trouver_id(&jobs, atoi(cmd->seq[0][1]));
}
kill(job->pid, SIGCONT);
pause();
continue;
}
else if (!strcmp(cmd->seq[0][0], "fg"))
{ // "fg"
cell *job;
if (cmd->seq[0][1] == NULL)
{ // no id
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fprintf(stderr, "ERROR: id missing\n");
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continue;
}
else
{ // id specified
job = trouver_id(&jobs, atoi(cmd->seq[0][1]));
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pid_fils = job->pid;
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}
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kill(pid_fils, SIGCONT);
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pause();
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waitpid(pid_fils, NULL, 0);
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continue;
}
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else if (!strcmp(cmd->seq[0][0], "stop"))
{ // "stop"
cell *job;
if (cmd->seq[0][1] == NULL)
{ // no id
fprintf(stderr, "ERROR: id missing\n");
continue;
}
else
{ // id specified
job = trouver_id(&jobs, atoi(cmd->seq[0][1]));
}
kill(job->pid, SIGSTOP);
pause();
continue;
}
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else if (!strcmp(cmd->seq[0][0], "pid"))
{ // "pid"
printf("pid=%d\n", getpid());
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_IGN;
sigaction(SIGTSTP, &action, NULL); // on igonre SIGTSTP
sigaction(SIGINT, &action, NULL); // on ignore SIGINT
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if (cmd->in)
{
file_in = open(cmd->in, O_RDONLY);
dup2(file_in, 0);
}
if (cmd->out)
{
file_out = open(cmd->out, O_CREAT | O_TRUNC | O_WRONLY, 0640);
dup2(file_out, 1);
}
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execvp(cmd->seq[0][0], cmd->seq[0]);
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fprintf(stderr, "ERROR: execvp failed, (%d) %s\n", errno, strerror(errno));
exit(errno); // si execvp échoue on exit avec une erreur
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}
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else
{ // instructions du père
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if (cmd->backgrounded)
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{ // background
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int id_fils = ajouter(&jobs, pid_fils, *(cmd->seq));
printf("[%d] %d\n", id_fils, pid_fils);
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}
else
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{ // foreground
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pid_t id = waitpid(pid_fils, &wait_code, 0);
if (id == -1)
{ // wait fail ?
fprintf(stderr, "ERROR: waiting for %d failed, (%d) %s\n", wait_code, errno, strerror(errno));
exit(errno);
}
if (wait_code)
{ // execvp fail ?
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fprintf(stderr, "ERROR: child failed, (%d) %s\n", wait_code, strerror(wait_code));
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}
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}
}
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}
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return EXIT_SUCCESS;
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}