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Commit 98da0aa4 authored by wlott's avatar wlott
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/*
* $Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/lisp/runprog.c,v 1.1 1993/08/04 11:25:08 wlott Exp $
*
* Support for run-program.
*
*/
#include <sys/file.h>
#include <sys/ioctl.h>
int spawn(char *program, char *argv[], char *envp[], char *pty_name,
int stdin, int stdout, int stderr)
{
int pid = fork();
int fd;
if (pid != 0)
return pid;
/* Put us in our own process group. */
#ifdef hpux
setsid();
#else
setpgrp(0, getpid());
#endif
/* If we are supposed to be part of some other pty, go for it. */
if (pty_name) {
#ifndef hpux
fd = open("/dev/tty", O_RDWR, 0);
if (fd >= 0) {
ioctl(fd, TIOCNOTTY, 0);
close(fd);
}
#endif
fd = open(pty_name, O_RDWR, 0);
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
close(fd);
}
/* Set up stdin, stdout, and stderr */
if (stdin >= 0)
dup2(stdin, 0);
if (stdout >= 0)
dup2(stdout, 1);
if (stderr >= 0)
dup2(stderr, 2);
/* Close all other fds. */
for (fd = getdtablesize()-1; fd >= 3; fd--)
close(fd);
/* Exec the program. */
execve(program, argv, envp);
/* It didn't work, so try /bin/sh. */
argv[0] = program;
argv[-1] = "sh";
execve("/bin/sh", argv-1, envp);
/* The exec didn't work, flame out. */
exit(1);
}
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