forkpty.c

压缩包中包含LINUX下多个命令的源码

/* Slightly modified version of libutil's forkpty function.
   There's probably a better way to do this.
   Adapted to inetutils by Bernhard Rosenkraenzer <[e-mail]> */

/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef HAVE_SYS_CDEFS_H
# include <sys/cdefs.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#ifdef HAVE_TERMIOS_H
# include <termios.h>
#endif
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#include <grp.h>

int
forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
{
  int master, slave, pid;

  if (openpty(&master, &slave, name, termp, winp) == -1)
    return (-1);
  switch (pid = fork()) {
  case -1:
    return (-1);
  case 0:
    /*
     * child
     */
    close(master);
    login_tty(slave);
    return (0);
  }
  /*
   * parent
   */
  *amaster = master;
  close(slave);
  return (pid);
}