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04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
201 lines
5.0 KiB
C
201 lines
5.0 KiB
C
/* Copyright (C) 1991-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <limits.h>
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#include <stddef.h>
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#include <dirent.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <termios.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <_itoa.h>
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#include "ttyname.h"
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static int getttyname_r (char *buf, size_t buflen,
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const struct stat64 *mytty, int save,
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int *dostat);
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static int
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attribute_compat_text_section
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getttyname_r (char *buf, size_t buflen, const struct stat64 *mytty,
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int save, int *dostat)
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{
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struct stat64 st;
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DIR *dirstream;
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struct dirent64 *d;
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size_t devlen = strlen (buf);
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dirstream = __opendir (buf);
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if (dirstream == NULL)
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{
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*dostat = -1;
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return errno;
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}
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while ((d = __readdir64 (dirstream)) != NULL)
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if ((d->d_fileno == mytty->st_ino || *dostat)
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&& strcmp (d->d_name, "stdin")
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&& strcmp (d->d_name, "stdout")
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&& strcmp (d->d_name, "stderr"))
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{
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char *cp;
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size_t needed = _D_EXACT_NAMLEN (d) + 1;
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if (needed > buflen)
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{
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*dostat = -1;
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(void) __closedir (dirstream);
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__set_errno (ERANGE);
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return ERANGE;
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}
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cp = __stpncpy (buf + devlen, d->d_name, needed);
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cp[0] = '\0';
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if (__xstat64 (_STAT_VER, buf, &st) == 0
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&& is_mytty (mytty, &st))
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{
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(void) __closedir (dirstream);
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__set_errno (save);
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return 0;
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}
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}
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(void) __closedir (dirstream);
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__set_errno (save);
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/* It is not clear what to return in this case. `isatty' says FD
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refers to a TTY but no entry in /dev has this inode. */
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return ENOTTY;
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}
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/* Store at most BUFLEN character of the pathname of the terminal FD is
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open on in BUF. Return 0 on success, otherwise an error number. */
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int
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__ttyname_r (int fd, char *buf, size_t buflen)
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{
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char procname[30];
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struct stat64 st, st1;
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int dostat = 0;
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int doispty = 0;
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int save = errno;
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/* Test for the absolute minimal size. This makes life easier inside
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the loop. */
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if (!buf)
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{
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__set_errno (EINVAL);
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return EINVAL;
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}
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if (buflen < sizeof ("/dev/pts/"))
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{
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__set_errno (ERANGE);
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return ERANGE;
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}
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/* isatty check, tcgetattr is used because it sets the correct
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errno (EBADF resp. ENOTTY) on error. */
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struct termios term;
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if (__glibc_unlikely (__tcgetattr (fd, &term) < 0))
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return errno;
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if (__fxstat64 (_STAT_VER, fd, &st) < 0)
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return errno;
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/* We try using the /proc filesystem. */
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*_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';
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ssize_t ret = __readlink (procname, buf, buflen - 1);
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if (__glibc_unlikely (ret == -1 && errno == ENAMETOOLONG))
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{
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__set_errno (ERANGE);
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return ERANGE;
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}
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if (__glibc_likely (ret != -1))
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{
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#define UNREACHABLE_LEN strlen ("(unreachable)")
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if (ret > UNREACHABLE_LEN
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&& memcmp (buf, "(unreachable)", UNREACHABLE_LEN) == 0)
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{
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memmove (buf, buf + UNREACHABLE_LEN, ret - UNREACHABLE_LEN);
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ret -= UNREACHABLE_LEN;
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}
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/* readlink need not terminate the string. */
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buf[ret] = '\0';
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/* Verify readlink result, fall back on iterating through devices. */
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if (buf[0] == '/'
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&& __xstat64 (_STAT_VER, buf, &st1) == 0
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&& is_mytty (&st, &st1))
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return 0;
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doispty = 1;
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}
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/* Prepare the result buffer. */
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memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/"));
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buflen -= sizeof ("/dev/pts/") - 1;
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if (__xstat64 (_STAT_VER, buf, &st1) == 0 && S_ISDIR (st1.st_mode))
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{
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ret = getttyname_r (buf, buflen, &st, save,
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&dostat);
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}
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else
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{
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__set_errno (save);
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ret = ENOENT;
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}
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if (ret && dostat != -1)
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{
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buf[sizeof ("/dev/") - 1] = '\0';
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buflen += sizeof ("pts/") - 1;
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ret = getttyname_r (buf, buflen, &st, save,
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&dostat);
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}
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if (ret && dostat != -1)
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{
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buf[sizeof ("/dev/") - 1] = '\0';
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dostat = 1;
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ret = getttyname_r (buf, buflen, &st,
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save, &dostat);
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}
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if (ret && doispty && is_pty (&st))
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{
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/* We failed to figure out the TTY's name, but we can at least
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signal that we did verify that it really is a PTY slave.
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This happens when we have inherited the file descriptor from
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a different mount namespace. */
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__set_errno (ENODEV);
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return ENODEV;
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}
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return ret;
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}
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weak_alias (__ttyname_r, ttyname_r)
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