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83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
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/*
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* Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "compat.h"
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void fatal(const char *, ...);
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void fatalx(const char *, ...);
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pid_t
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forkpty(int *master, char *name, struct termios *tio, struct winsize *ws)
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{
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int slave = -1;
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char *path;
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pid_t pid;
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if ((*master = open("/dev/ptmx", O_RDWR|O_NOCTTY)) == -1)
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return (-1);
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if (grantpt(*master) != 0)
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goto out;
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if (unlockpt(*master) != 0)
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goto out;
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if ((path = ptsname(*master)) == NULL)
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goto out;
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if (name != NULL)
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strlcpy(name, path, TTY_NAME_MAX);
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if ((slave = open(path, O_RDWR|O_NOCTTY)) == -1)
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goto out;
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switch (pid = fork()) {
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case -1:
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goto out;
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case 0:
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close(*master);
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setsid();
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if (ioctl(slave, TIOCSCTTY, NULL) == -1)
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fatal("ioctl failed");
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if (tio != NULL && tcsetattr(slave, TCSAFLUSH, tio) == -1)
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fatal("tcsetattr failed");
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if (ioctl(slave, TIOCSWINSZ, ws) == -1)
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fatal("ioctl failed");
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dup2(slave, 0);
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dup2(slave, 1);
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dup2(slave, 2);
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if (slave > 2)
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close(slave);
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return (0);
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}
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close(slave);
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return (pid);
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out:
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if (*master != -1)
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close(*master);
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if (slave != -1)
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close(slave);
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return (-1);
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}
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