| /* Copyright (C) 1991-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <limits.h> |
| #include <stddef.h> |
| #include <dirent.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <stdlib.h> |
| |
| #ifndef MIN |
| # define MIN(a, b) ((a) < (b) ? (a) : (b)) |
| #endif |
| |
| static const char dev[] = "/dev"; |
| |
| static int getttyname_r (int fd, char *buf, size_t buflen, |
| dev_t mydev, ino_t myino, int save, |
| int *dostat) __THROW internal_function; |
| |
| static int |
| internal_function |
| getttyname_r (fd, buf, buflen, mydev, myino, save, dostat) |
| int fd; |
| char *buf; |
| size_t buflen; |
| dev_t mydev; |
| ino_t myino; |
| int save; |
| int *dostat; |
| { |
| struct stat st; |
| DIR *dirstream; |
| struct dirent *d; |
| |
| dirstream = __opendir (dev); |
| if (dirstream == NULL) |
| { |
| *dostat = -1; |
| return errno; |
| } |
| |
| while ((d = __readdir (dirstream)) != NULL) |
| if (((ino_t) d->d_fileno == myino || *dostat) |
| && strcmp (d->d_name, "stdin") |
| && strcmp (d->d_name, "stdout") |
| && strcmp (d->d_name, "stderr")) |
| { |
| char *cp; |
| size_t needed = _D_EXACT_NAMLEN (d) + 1; |
| |
| if (needed > buflen) |
| { |
| *dostat = -1; |
| (void) __closedir (dirstream); |
| __set_errno (ERANGE); |
| return ERANGE; |
| } |
| |
| cp = __stpncpy (&buf[sizeof (dev)], d->d_name, needed); |
| cp[0] = '\0'; |
| |
| if (stat (buf, &st) == 0 |
| #ifdef _STATBUF_ST_RDEV |
| && S_ISCHR (st.st_mode) && st.st_rdev == mydev |
| #else |
| && (ino_t) d->d_fileno == myino && st.st_dev == mydev |
| #endif |
| ) |
| { |
| (void) __closedir (dirstream); |
| __set_errno (save); |
| return 0; |
| } |
| } |
| |
| (void) __closedir (dirstream); |
| __set_errno (save); |
| /* It is not clear what to return in this case. `isatty' says FD |
| refers to a TTY but no entry in /dev has this inode. */ |
| return ENOTTY; |
| } |
| |
| /* Store at most BUFLEN character of the pathname of the terminal FD is |
| open on in BUF. Return 0 on success, otherwise an error number. */ |
| int |
| __ttyname_r (fd, buf, buflen) |
| int fd; |
| char *buf; |
| size_t buflen; |
| { |
| struct stat st; |
| int dostat = 0; |
| int save = errno; |
| int ret; |
| |
| /* Test for the absolute minimal size. This makes life easier inside |
| the loop. */ |
| if (!buf) |
| { |
| __set_errno (EINVAL); |
| return EINVAL; |
| } |
| |
| if (buflen < (int) (sizeof (dev) + 1)) |
| { |
| __set_errno (ERANGE); |
| return ERANGE; |
| } |
| |
| if (!__isatty (fd)) |
| { |
| __set_errno (ENOTTY); |
| return ENOTTY; |
| } |
| |
| if (fstat (fd, &st) < 0) |
| return errno; |
| |
| /* Prepare the result buffer. */ |
| memcpy (buf, dev, sizeof (dev) - 1); |
| buf[sizeof (dev) - 1] = '/'; |
| buflen -= sizeof (dev); |
| |
| #ifdef _STATBUF_ST_RDEV |
| ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, save, |
| &dostat); |
| #else |
| ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, save, |
| &dostat); |
| #endif |
| |
| if (ret && dostat != -1) |
| { |
| dostat = 1; |
| #ifdef _STATBUF_ST_RDEV |
| ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, |
| save, &dostat); |
| #else |
| ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, |
| save, &dostat); |
| #endif |
| } |
| |
| return ret; |
| } |
| |
| weak_alias (__ttyname_r, ttyname_r) |