diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/ttyname.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/ttyname.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/ttyname.c b/sysdeps/unix/sysv/linux/ttyname.c new file mode 100644 index 0000000000..7f276b6130 --- /dev/null +++ b/sysdeps/unix/sysv/linux/ttyname.c @@ -0,0 +1,152 @@ +/* Copyright (C) 1991, 92, 93, 96, 97, 98 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#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> + +char *__ttyname = NULL; + +static char * getttyname __P ((const char *dev, int fd, dev_t mydev, + ino_t myino, int save, int *dostat)) + internal_function; + +static char * +internal_function +getttyname (dev, fd, mydev, myino, save, dostat) + const char *dev; + int fd; + dev_t mydev; + ino_t myino; + int save; + int *dostat; +{ + static char *name; + static size_t namelen = 0; + struct stat st; + DIR *dirstream; + struct dirent *d; + size_t devlen = strlen (dev) + 1; + + dirstream = opendir (dev); + if (dirstream == NULL) + { + *dostat = -1; + return NULL; + } + + 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")) + { + size_t dlen = _D_ALLOC_NAMLEN (d); + if (devlen + dlen > namelen) + { + free (name); + namelen = 2 * (devlen + dlen); /* Big enough. */ + name = malloc (namelen); + if (! name) + { + *dostat = -1; + /* Perhaps it helps to free the directory stream buffer. */ + (void) closedir (dirstream); + return NULL; + } + *((char *) __mempcpy (name, dev, devlen - 1)) = '/'; + } + memcpy (&name[devlen], d->d_name, dlen); + if (stat (name, &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); + __ttyname = name; + __set_errno (save); + return name; + } + } + + (void) closedir (dirstream); + __set_errno (save); + return NULL; +} + +/* Return the pathname of the terminal FD is open on, or NULL on errors. + The returned storage is good only until the next call to this function. */ +char * +ttyname (fd) + int fd; +{ + struct stat st, st1; + int dostat = 0; + char *name; + int save = errno; + + if (!__isatty (fd)) + return NULL; + + if (fstat (fd, &st) < 0) + return NULL; + + if (stat ("/dev/pts", &st1) == 0 && S_ISDIR (st1.st_mode)) + { +#ifdef _STATBUF_ST_RDEV + name = getttyname ("/dev/pts", fd, st.st_rdev, st.st_ino, save, &dostat); +#else + name = getttyname ("/dev/pts", fd, st.st_dev, st.st_ino, save, &dostat); +#endif + } + else + { + __set_errno (save); + name = NULL; + } + + if (!name && dostat != -1) + { +#ifdef _STATBUF_ST_RDEV + name = getttyname ("/dev", fd, st.st_rdev, st.st_ino, save, &dostat); +#else + name = getttyname ("/dev", fd, st.st_dev, st.st_ino, save, &dostat); +#endif + } + + if (!name && dostat != -1) + { + dostat = 1; +#ifdef _STATBUF_ST_RDEV + name = getttyname ("/dev", fd, st.st_rdev, st.st_ino, save, &dostat); +#else + name = getttyname ("/dev", fd, st.st_dev, st.st_ino, save, &dostat); +#endif + } + + return name; +} |