116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
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#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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extern int errno;
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struct cmdline *cmd;
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int pid_fils;
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int prompting = 0;
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jmp_buf goto_prompt;
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char initcd[256], currentcd[256];
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void handler_sigchld(int sig_num)
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{
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if (prompting)
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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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}
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int main(int argc, char *argv[])
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{
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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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// loop principal
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while (1)
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{
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sigsetjmp(goto_prompt, 1);
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prompting = 1;
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getcwd(currentcd, sizeof(currentcd));
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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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}
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else if (cmd->seq[0] == NULL)
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{ // empty
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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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{ // "exit"
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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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{ // no path
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ret = chdir(initcd);
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}
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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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}
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continue;
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}
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pid_fils = fork();
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if (pid_fils == -1)
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{ // 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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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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{ // background
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int wait_code;
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pid_t id = waitpid(pid_fils, &wait_code, 0); // on attend la fin de l'exec du fils
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if (id == -1)
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{ // wait fail ?
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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)
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{ // execvp fail ?
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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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}
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}
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return EXIT_SUCCESS;
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}
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