system.c

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#include "config.h"
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sys/wait.h> // IWYU pragma: keep
#include <unistd.h>
#include "mutt/lib.h"
#include "protos.h"
#ifdef USE_IMAP
#include "imap/lib.h"
#endif
 
int mutt_system(const char *cmd)
{
  int rc = -1;
  struct sigaction act;
  struct sigaction oldtstp;
  struct sigaction oldcont;
  pid_t pid;
 
  if (!cmd || (*cmd == '\0'))
    return 0;
 
  /* must ignore SIGINT and SIGQUIT */
 
  mutt_sig_block_system();
 
  act.sa_handler = SIG_DFL;
/* we want to restart the waitpid() below */
#ifdef SA_RESTART
  act.sa_flags = SA_RESTART;
#endif
  sigemptyset(&act.sa_mask);
  sigaction(SIGTSTP, &act, &oldtstp);
  sigaction(SIGCONT, &act, &oldcont);
 
  pid = fork();
  if (pid == 0)
  {
    act.sa_flags = 0;
 
    /* reset signals for the child; not really needed, but... */
    mutt_sig_unblock_system(false);
    act.sa_handler = SIG_DFL;
    act.sa_flags = 0;
    sigemptyset(&act.sa_mask);
    sigaction(SIGTERM, &act, NULL);
    sigaction(SIGTSTP, &act, NULL);
    sigaction(SIGCONT, &act, NULL);
 
    execle(EXEC_SHELL, "sh", "-c", cmd, NULL, mutt_envlist_getlist());
    _exit(127); /* execl error */
  }
  else if (pid != -1)
  {
#ifdef USE_IMAP
    rc = imap_wait_keepalive(pid);
#endif
  }
 
  sigaction(SIGCONT, &oldcont, NULL);
  sigaction(SIGTSTP, &oldtstp, NULL);
 
  /* reset SIGINT, SIGQUIT and SIGCHLD */
  mutt_sig_unblock_system(true);
 
  rc = (pid != -1) ? (WIFEXITED(rc) ? WEXITSTATUS(rc) : -1) : -1;
 
  return rc;
}