-/* Copyright (C) 1991,92,93,95,96,97,98,99 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2019 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.
+ 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
- Library General Public License for more details.
+ Lesser 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. */
+ 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 <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
+#include <termios.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
-#include <stdio-common/_itoa.h>
+#include <_itoa.h>
-static int getttyname_r __P ((char *buf, size_t buflen,
- dev_t mydev, ino_t myino, int save,
- int *dostat)) internal_function;
+#include "ttyname.h"
+
+static int getttyname_r (char *buf, size_t buflen,
+ const struct stat64 *mytty, int save,
+ int *dostat);
static int
-internal_function
-getttyname_r (buf, buflen, mydev, myino, save, dostat)
- char *buf;
- size_t buflen;
- dev_t mydev;
- ino_t myino;
- int save;
- int *dostat;
+attribute_compat_text_section
+getttyname_r (char *buf, size_t buflen, const struct stat64 *mytty,
+ int save, int *dostat)
{
- struct stat st;
+ struct stat64 st;
DIR *dirstream;
- struct dirent *d;
+ struct dirent64 *d;
size_t devlen = strlen (buf);
dirstream = __opendir (buf);
return errno;
}
- while ((d = __readdir (dirstream)) != NULL)
- if (((ino_t) d->d_fileno == myino || *dostat)
+ while ((d = __readdir64 (dirstream)) != NULL)
+ if ((d->d_fileno == mytty->st_ino || *dostat)
&& strcmp (d->d_name, "stdin")
&& strcmp (d->d_name, "stdout")
&& strcmp (d->d_name, "stderr"))
cp = __stpncpy (buf + devlen, d->d_name, needed);
cp[0] = '\0';
- if (__xstat (_STAT_VER, 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
- )
+ if (__xstat64 (_STAT_VER, buf, &st) == 0
+ && is_mytty (mytty, &st))
{
(void) __closedir (dirstream);
__set_errno (save);
/* 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;
+__ttyname_r (int fd, char *buf, size_t buflen)
{
- static int dev_pts_available = 1;
char procname[30];
- struct stat st, st1;
+ struct stat64 st, st1;
int dostat = 0;
+ int doispty = 0;
int save = errno;
- int ret;
/* Test for the absolute minimal size. This makes life easier inside
the loop. */
return ERANGE;
}
- if (!__isatty (fd))
- {
- __set_errno (ENOTTY);
- return ENOTTY;
- }
+ /* 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';
- ret = __readlink (procname, buf, buflen - 1);
- if (ret != -1 && buf[0] != '[')
- return 0;
- if (ret == -1 && errno == ENAMETOOLONG)
+ ssize_t ret = __readlink (procname, buf, buflen - 1);
+ if (__glibc_unlikely (ret == -1 && errno == ENAMETOOLONG))
{
__set_errno (ERANGE);
return ERANGE;
}
- if (__fxstat (_STAT_VER, fd, &st) < 0)
- return errno;
+ 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
+ && is_mytty (&st, &st1))
+ return 0;
+
+ doispty = 1;
+ }
/* Prepare the result buffer. */
memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/"));
buflen -= sizeof ("/dev/pts/") - 1;
- if (dev_pts_available)
+ if (__xstat64 (_STAT_VER, buf, &st1) == 0 && S_ISDIR (st1.st_mode))
{
- if (__xstat (_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;
- dev_pts_available = 0;
- }
+ ret = getttyname_r (buf, buflen, &st, save,
+ &dostat);
+ }
+ 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,
+ ret = getttyname_r (buf, buflen, &st, 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,
+ ret = getttyname_r (buf, buflen, &st,
save, &dostat);
-#endif
+ }
+
+ if (ret && doispty && is_pty (&st))
+ {
+ /* We failed to figure out the TTY's name, but we can at least
+ signal that we did verify that it really is a PTY slave.
+ This happens when we have inherited the file descriptor from
+ a different mount namespace. */
+ __set_errno (ENODEV);
+ return ENODEV;
}
return ret;
projects / thirdparty / glibc.git / blobdiff