Minix1.5/lib/ansi/system.c

/*  system.c
 *
 *  Changed to return() on fork failure, added signal()
 *  calls.          Terrence W. Holm      Oct. 1988
 */

#include <lib.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdio.h>

int system(cmd)
_CONST char *cmd;
{
  int retstat, procid, waitstat;
  void (*sigint) (), (*sigquit) ();

  if ((procid = fork()) == 0) {
	/* Child does an exec of the command. */
	execl("/bin/sh", "sh", "-c", cmd, (char *) 0);
	exit(127);
  }

  /* Check to see if fork failed. */
  if (procid < 0) return(127 << 8);

  sigint = signal(SIGINT, SIG_IGN);
  sigquit = signal(SIGQUIT, SIG_IGN);

  while ((waitstat = wait(&retstat)) != procid && waitstat != -1);
  if (waitstat == -1) retstat = -1;

  signal(SIGINT, sigint);
  signal(SIGQUIT, sigquit);

  return(retstat);
}