diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/ttyname_r.c')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/ttyname_r.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/ttyname_r.c b/REORG.TODO/sysdeps/unix/sysv/linux/ttyname_r.c new file mode 100644 index 0000000000..dc863526ba --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/ttyname_r.c @@ -0,0 +1,221 @@ +/* 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 <termios.h> +#include <unistd.h> +#include <string.h> +#include <stdlib.h> + +#include <_itoa.h> + +#include "ttyname.h" + +static int getttyname_r (char *buf, size_t buflen, + dev_t mydev, ino64_t myino, int save, + int *dostat) internal_function; + +static int +internal_function attribute_compat_text_section +getttyname_r (char *buf, size_t buflen, dev_t mydev, ino64_t myino, + int save, int *dostat) +{ + struct stat64 st; + DIR *dirstream; + struct dirent64 *d; + size_t devlen = strlen (buf); + + dirstream = __opendir (buf); + if (dirstream == NULL) + { + *dostat = -1; + return errno; + } + + while ((d = __readdir64 (dirstream)) != NULL) + if ((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 + devlen, d->d_name, needed); + cp[0] = '\0'; + + if (__xstat64 (_STAT_VER, buf, &st) == 0 +#ifdef _STATBUF_ST_RDEV + && S_ISCHR (st.st_mode) && st.st_rdev == mydev +#else + && 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) +{ + char procname[30]; + struct stat64 st, st1; + int dostat = 0; + int save = errno; + + /* Test for the absolute minimal size. This makes life easier inside + the loop. */ + if (!buf) + { + __set_errno (EINVAL); + return EINVAL; + } + + if (buflen < sizeof ("/dev/pts/")) + { + __set_errno (ERANGE); + return ERANGE; + } + + /* isatty check, tcgetattr is used because it sets the correct + errno (EBADF resp. ENOTTY) on error. */ + struct termios term; + if (__glibc_unlikely (__tcgetattr (fd, &term) < 0)) + return errno; + + if (__fxstat64 (_STAT_VER, fd, &st) < 0) + return errno; + + /* We try using the /proc filesystem. */ + *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0'; + + ssize_t ret = __readlink (procname, buf, buflen - 1); + if (__glibc_unlikely (ret == -1 && errno == ENAMETOOLONG)) + { + __set_errno (ERANGE); + return ERANGE; + } + + if (__glibc_likely (ret != -1)) + { +#define UNREACHABLE_LEN strlen ("(unreachable)") + if (ret > UNREACHABLE_LEN + && memcmp (buf, "(unreachable)", UNREACHABLE_LEN) == 0) + { + memmove (buf, buf + UNREACHABLE_LEN, ret - UNREACHABLE_LEN); + ret -= UNREACHABLE_LEN; + } + + /* readlink need not terminate the string. */ + buf[ret] = '\0'; + + /* Verify readlink result, fall back on iterating through devices. */ + if (buf[0] == '/' + && __xstat64 (_STAT_VER, buf, &st1) == 0 +#ifdef _STATBUF_ST_RDEV + && S_ISCHR (st1.st_mode) + && st1.st_rdev == st.st_rdev +#endif + && st1.st_ino == st.st_ino + && st1.st_dev == st.st_dev) + return 0; + + /* If the link doesn't exist, then it points to a device in another + * namespace. + */ + if (is_pty (&st)) + { + __set_errno (ENODEV); + return ENODEV; + } + } + + /* Prepare the result buffer. */ + memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/")); + buflen -= sizeof ("/dev/pts/") - 1; + + if (__xstat64 (_STAT_VER, buf, &st1) == 0 && S_ISDIR (st1.st_mode)) + { +#ifdef _STATBUF_ST_RDEV + ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, + &dostat); +#else + ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, + &dostat); +#endif + } + else + { + __set_errno (save); + ret = ENOENT; + } + + if (ret && dostat != -1) + { + buf[sizeof ("/dev/") - 1] = '\0'; + buflen += sizeof ("pts/") - 1; +#ifdef _STATBUF_ST_RDEV + ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, + &dostat); +#else + ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, + &dostat); +#endif + } + + if (ret && dostat != -1) + { + buf[sizeof ("/dev/") - 1] = '\0'; + dostat = 1; +#ifdef _STATBUF_ST_RDEV + ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, + save, &dostat); +#else + ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, + save, &dostat); +#endif + } + + return ret; +} + +weak_alias (__ttyname_r, ttyname_r) |