/*- * Copyright (c) 2008 Ed Schouten * All rights reserved. * * Portions of this software were developed under sponsorship from Snow * B.V., the Netherlands. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. */ #include #ifndef lint __FBSDID("$FreeBSD$"); #endif /* not lint */ #include "namespace.h" #include #include #include #include #include "un-namespace.h" /* * __isptmaster(): return whether the file descriptor refers to a * pseudo-terminal master device. */ static int __isptmaster(int fildes) { if (_ioctl(fildes, TIOCPTMASTER) == 0) return (0); if (errno != EBADF) errno = EINVAL; return (-1); } /* * In our implementation, grantpt() and unlockpt() don't actually have * any use, because PTY's are created on the fly and already have proper * permissions upon creation. * * Just make sure `fildes' actually points to a real PTY master device. */ __strong_reference(__isptmaster, grantpt); __strong_reference(__isptmaster, unlockpt); /* * ptsname(): return the pathname of the slave pseudo-terminal device * associated with the specified master. */ char * ptsname(int fildes) { static char pt_slave[sizeof _PATH_DEV + SPECNAMELEN] = _PATH_DEV; struct fiodgname_arg fgn; char *ret = NULL; int sverrno = errno; /* Make sure fildes points to a master device. */ if (__isptmaster(fildes) != 0) goto done; /* Obtain the device name through FIODGNAME. */ fgn.len = sizeof pt_slave - (sizeof _PATH_DEV - 1); fgn.buf = pt_slave + (sizeof _PATH_DEV - 1); if (_ioctl(fildes, FIODGNAME, &fgn) == 0) ret = pt_slave; done: /* Make sure ptsname() does not overwrite errno. */ errno = sverrno; return (ret); }