diff options
Diffstat (limited to 'REORG.TODO/sysdeps/posix/ttyname_r.c')
| -rw-r--r-- | REORG.TODO/sysdeps/posix/ttyname_r.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/posix/ttyname_r.c b/REORG.TODO/sysdeps/posix/ttyname_r.c new file mode 100644 index 0000000000..56bf18e4bc --- /dev/null +++ b/REORG.TODO/sysdeps/posix/ttyname_r.c @@ -0,0 +1,156 @@ +/* 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> + +#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 (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 (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) |