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120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
/*
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* Copyright (c) 2009 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 <stropts.h>
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#include <unistd.h>
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#include <errno.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, __unused char *name, struct termios *tio,
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struct winsize *ws)
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{
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int slave = -1, fd, pipe_fd[2];
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char *path, dummy;
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pid_t pid;
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if (pipe(pipe_fd) == -1)
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return (-1);
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if ((*master = open("/dev/ptc", O_RDWR|O_NOCTTY)) == -1)
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goto out;
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if ((path = ttyname(*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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close(pipe_fd[1]);
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while (read(pipe_fd[0], &dummy, 1) == -1) {
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if (errno != EINTR)
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break;
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}
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close(pipe_fd[0]);
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fd = open(_PATH_TTY, O_RDWR|O_NOCTTY);
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if (fd >= 0) {
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ioctl(fd, TIOCNOTTY, NULL);
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close(fd);
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}
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if (setsid() < 0)
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fatal("setsid");
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fd = open(_PATH_TTY, O_RDWR|O_NOCTTY);
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if (fd >= 0)
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fatalx("open succeeded (failed to disconnect)");
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fd = open(path, O_RDWR);
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if (fd < 0)
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fatal("open failed");
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close(fd);
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fd = open("/dev/tty", O_WRONLY);
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if (fd < 0)
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fatal("open failed");
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close(fd);
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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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close(pipe_fd[0]);
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close(pipe_fd[1]);
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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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close(pipe_fd[0]);
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close(pipe_fd[1]);
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return (-1);
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}
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