Mercurial > gnulib
annotate lib/ptsname_r.c @ 16201:8250f2777afc
maint: update all copyright year number ranges
Run "make update-copyright".
| author | Jim Meyering <meyering@redhat.com> |
|---|---|
| date | Sun, 01 Jan 2012 10:04:58 +0100 |
| parents | c4b6df81c7b3 |
| children | f0c9b2dc0596 |
| rev | line source |
|---|---|
| 16067 | 1 /* Determine name of the slave side of a pseudo-terminal. |
|
16201
8250f2777afc
maint: update all copyright year number ranges
Jim Meyering <meyering@redhat.com>
parents:
16067
diff
changeset
|
2 Copyright (C) 1998, 2002, 2010-2012 Free Software Foundation, Inc. |
| 16067 | 3 |
| 4 This program is free software: you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation; either version 3 of the License, or | |
| 7 (at your option) any later version. | |
| 8 | |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License | |
| 15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 16 | |
| 17 #include <config.h> | |
| 18 | |
| 19 #include <stdlib.h> | |
| 20 | |
| 21 #include <errno.h> | |
| 22 #include <string.h> | |
| 23 #include <sys/stat.h> | |
| 24 #include <unistd.h> | |
| 25 | |
| 26 #ifdef _LIBC | |
| 27 # include <paths.h> | |
| 28 #else | |
| 29 # ifndef _PATH_TTY | |
| 30 # define _PATH_TTY "/dev/tty" | |
| 31 # endif | |
| 32 # ifndef _PATH_DEV | |
| 33 # define _PATH_DEV "/dev/" | |
| 34 # endif | |
| 35 | |
| 36 # define __set_errno(e) errno = (e) | |
| 37 # define __isatty isatty | |
| 38 # define __stat stat | |
| 39 # define __ttyname_r ttyname_r | |
| 40 # define __ptsname_r ptsname_r | |
| 41 | |
| 42 #endif | |
| 43 | |
| 44 | |
| 45 /* Store at most BUFLEN characters of the pathname of the slave pseudo | |
| 46 terminal associated with the master FD is open on in BUF. | |
| 47 Return 0 on success, otherwise an error number. */ | |
| 48 int | |
| 49 __ptsname_r (int fd, char *buf, size_t buflen) | |
| 50 { | |
| 51 int save_errno = errno; | |
| 52 int err; | |
| 53 struct stat st; | |
| 54 | |
| 55 if (buf == NULL) | |
| 56 { | |
| 57 __set_errno (EINVAL); | |
| 58 return EINVAL; | |
| 59 } | |
| 60 | |
| 61 if (!__isatty (fd)) | |
| 62 /* We rely on isatty to set errno properly (i.e. EBADF or ENOTTY). */ | |
| 63 return errno; | |
| 64 | |
| 65 if (buflen < strlen (_PATH_TTY) + 3) | |
| 66 { | |
| 67 __set_errno (ERANGE); | |
| 68 return ERANGE; | |
| 69 } | |
| 70 | |
| 71 err = __ttyname_r (fd, buf, buflen); | |
| 72 if (err != 0) | |
| 73 { | |
| 74 __set_errno (err); | |
| 75 return errno; | |
| 76 } | |
| 77 | |
| 78 buf[sizeof (_PATH_DEV) - 1] = 't'; | |
| 79 | |
| 80 if (__stat (buf, &st) < 0) | |
| 81 return errno; | |
| 82 | |
| 83 __set_errno (save_errno); | |
| 84 return 0; | |
| 85 } |