| /* Copyright (C) 1998,2002,2010 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <paths.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| |
| /* Static buffer for `ptsname'. */ |
| static char buffer[sizeof (_PATH_TTY) + 2]; |
| |
| |
| /* Return the pathname of the pseudo terminal slave assoicated with |
| the master FD is open on, or NULL on errors. |
| The returned storage is good until the next call to this function. */ |
| char * |
| ptsname (int fd) |
| { |
| return __ptsname_r (fd, buffer, sizeof (buffer)) != 0 ? NULL : buffer; |
| } |
| |
| |
| /* Store at most BUFLEN characters of the pathname of the slave pseudo |
| terminal associated with the master FD is open on in BUF. |
| Return 0 on success, otherwise an error number. */ |
| int |
| __ptsname_r (int fd, char *buf, size_t buflen) |
| { |
| int save_errno = errno; |
| int err; |
| struct stat st; |
| |
| if (buf == NULL) |
| { |
| __set_errno (EINVAL); |
| return EINVAL; |
| } |
| |
| if (!__isatty (fd)) |
| /* We rely on isatty to set errno properly (i.e. EBADF or ENOTTY). */ |
| return errno; |
| |
| if (buflen < strlen (_PATH_TTY) + 3) |
| { |
| __set_errno (ERANGE); |
| return ERANGE; |
| } |
| |
| err = __ttyname_r (fd, buf, buflen); |
| if (err != 0) |
| { |
| __set_errno (err); |
| return errno; |
| } |
| |
| buf[sizeof (_PATH_DEV) - 1] = 't'; |
| |
| if (__stat (buf, &st) < 0) |
| return errno; |
| |
| __set_errno (save_errno); |
| return 0; |
| } |
| weak_alias (__ptsname_r, ptsname_r) |