diff options
Diffstat (limited to 'REORG.TODO/sysdeps/posix/ttyname.c')
| -rw-r--r-- | REORG.TODO/sysdeps/posix/ttyname.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/posix/ttyname.c b/REORG.TODO/sysdeps/posix/ttyname.c new file mode 100644 index 0000000000..288e22b307 --- /dev/null +++ b/REORG.TODO/sysdeps/posix/ttyname.c @@ -0,0 +1,129 @@ +/* Copyright (C) 1991-2017 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> + +char *__ttyname; + +static char *getttyname (int fd, dev_t mydev, ino_t myino, + int save, int *dostat) internal_function; + + +libc_freeres_ptr (static char *getttyname_name); + +static char * +internal_function +getttyname (int fd, dev_t mydev, ino_t myino, int save, int *dostat) +{ + static const char dev[] = "/dev"; + static size_t namelen; + struct stat st; + DIR *dirstream; + struct dirent *d; + + 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 (sizeof (dev) + dlen > namelen) + { + free (getttyname_name); + namelen = 2 * (sizeof (dev) + dlen); /* Big enough. */ + getttyname_name = malloc (namelen); + if (! getttyname_name) + { + *dostat = -1; + /* Perhaps it helps to free the directory stream buffer. */ + (void) __closedir (dirstream); + return NULL; + } + *((char *) __mempcpy (getttyname_name, dev, sizeof (dev) - 1)) + = '/'; + } + (void) __mempcpy (&getttyname_name[sizeof (dev)], d->d_name, dlen); + if (stat (getttyname_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 = getttyname_name; + __set_errno (save); + return getttyname_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 (int fd) +{ + struct stat st; + int dostat = 0; + char *name; + int save = errno; + + if (!__isatty (fd)) + return NULL; + + if (fstat (fd, &st) < 0) + return NULL; + +#ifdef _STATBUF_ST_RDEV + name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat); +#else + name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat); +#endif + + if (!name && dostat != -1) + { + dostat = 1; +#ifdef _STATBUF_ST_RDEV + name = getttyname (fd, st.st_rdev, st.st_ino, save, &dostat); +#else + name = getttyname (fd, st.st_dev, st.st_ino, save, &dostat); +#endif + } + + return name; +} |