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* Copyright (c) 2009-2011 Todd C. Miller <Todd.Miller@courtesan.com>
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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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* 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 USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#ifdef HAVE_SYS_STROPTS_H
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#include <sys/stropts.h>
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#endif /* HAVE_SYS_STROPTS_H */
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#endif /* STDC_HEADERS */
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#endif /* HAVE_STRING_H */
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#endif /* HAVE_STRINGS_H */
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#endif /* HAVE_UNISTD_H */
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#if defined(HAVE_LIBUTIL_H)
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#elif defined(HAVE_UTIL_H)
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#if defined(HAVE_OPENPTY)
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get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
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if ((gr = getgrnam("tty")) != NULL)
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if (openpty(master, slave, name, NULL, NULL) != 0)
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if (chown(name, ttyuid, ttygid) != 0)
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#elif defined(HAVE__GETPTY)
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get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
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/* IRIX-style dynamic ptys (may fork) */
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line = _getpty(master, O_RDWR, S_IRUSR|S_IWUSR|S_IWGRP, 0);
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*slave = open(line, O_RDWR|O_NOCTTY, 0);
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(void) chown(line, ttyuid, -1);
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strlcpy(name, line, namesz);
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#elif defined(HAVE_GRANTPT)
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# ifndef HAVE_POSIX_OPENPT
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posix_openpt(int oflag)
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fd = open("/dev/ptc", oflag);
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fd = open("/dev/ptmx", oflag);
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# endif /* HAVE_POSIX_OPENPT */
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get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
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*master = posix_openpt(O_RDWR|O_NOCTTY);
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(void) grantpt(*master); /* may fork */
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if (unlockpt(*master) != 0) {
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line = ptsname(*master);
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*slave = open(line, O_RDWR|O_NOCTTY, 0);
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# if defined(I_PUSH) && !defined(_AIX)
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ioctl(*slave, I_PUSH, "ptem"); /* pseudo tty emulation module */
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ioctl(*slave, I_PUSH, "ldterm"); /* line discipline module */
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(void) chown(line, ttyuid, -1);
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strlcpy(name, line, namesz);
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#else /* Old-style BSD ptys */
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static char line[] = "/dev/ptyXX";
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get_pty(int *master, int *slave, char *name, size_t namesz, uid_t ttyuid)
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if ((gr = getgrnam("tty")) != NULL)
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for (bank = "pqrs"; *bank != '\0'; bank++) {
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line[sizeof("/dev/ptyX") - 2] = *bank;
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for (cp = "0123456789abcdef"; *cp != '\0'; cp++) {
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line[sizeof("/dev/ptyXX") - 2] = *cp;
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*master = open(line, O_RDWR|O_NOCTTY, 0);
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return 0; /* out of ptys */
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continue; /* already in use */
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line[sizeof("/dev/p") - 2] = 't';
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(void) chown(line, ttyuid, ttygid);
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(void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
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*slave = open(line, O_RDWR|O_NOCTTY, 0);
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strlcpy(name, line, namesz);
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return 1; /* success */
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(void) close(*master);
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#endif /* HAVE_OPENPTY */