+++ /dev/null
-/* Create /proc/self/fd-related names for subfiles of open directories.
-
- Copyright (C) 2006 Free Software Foundation, Inc.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program 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 General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-/* Written by Paul Eggert. */
-
-#include <config.h>
-
-#include "openat-priv.h"
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-
-#include <stdio.h>
-#include <string.h>
-
-#include "dirname.h"
-#include "intprops.h"
-#include "same-inode.h"
-#include "xalloc.h"
-
-/* The results of open() in this file are not used with fchdir,
- therefore save some unnecessary work in fchdir.c. */
-#undef open
-#undef close
-
-#define PROC_SELF_FD_FORMAT "/proc/self/fd/%d/%s"
-
-#define PROC_SELF_FD_NAME_SIZE_BOUND(len) \
- (sizeof PROC_SELF_FD_FORMAT - sizeof "%d%s" \
- + INT_STRLEN_BOUND (int) + (len) + 1)
-
-
-/* Set BUF to the expansion of PROC_SELF_FD_FORMAT, using FD and FILE
- respectively for %d and %s. If successful, return BUF if the
- result fits in BUF, dynamically allocated memory otherwise. But
- return NULL if /proc is not reliable. */
-char *
-openat_proc_name (char buf[OPENAT_BUFFER_SIZE], int fd, char const *file)
-{
- static int proc_status = 0;
-
- if (! proc_status)
- {
- /* Set PROC_STATUS to a positive value if /proc/self/fd is
- reliable, and a negative value otherwise. Solaris 10
- /proc/self/fd mishandles "..", and any file name might expand
- to ".." after symbolic link expansion, so avoid /proc/self/fd
- if it mishandles "..". Solaris 10 has openat, but this
- problem is exhibited on code that built on Solaris 8 and
- running on Solaris 10. */
-
- int proc_self_fd = open ("/proc/self/fd", O_RDONLY);
- if (proc_self_fd < 0)
- proc_status = -1;
- else
- {
- struct stat proc_self_fd_dotdot_st;
- struct stat proc_self_st;
- char dotdot_buf[PROC_SELF_FD_NAME_SIZE_BOUND (sizeof ".." - 1)];
- sprintf (dotdot_buf, PROC_SELF_FD_FORMAT, proc_self_fd, "..");
- proc_status =
- ((stat (dotdot_buf, &proc_self_fd_dotdot_st) == 0
- && stat ("/proc/self", &proc_self_st) == 0
- && SAME_INODE (proc_self_fd_dotdot_st, proc_self_st))
- ? 1 : -1);
- close (proc_self_fd);
- }
- }
-
- if (proc_status < 0)
- return NULL;
- else
- {
- size_t bufsize = PROC_SELF_FD_NAME_SIZE_BOUND (strlen (file));
- char *result = (bufsize < OPENAT_BUFFER_SIZE ? buf : xmalloc (bufsize));
- sprintf (result, PROC_SELF_FD_FORMAT, fd, file);
- return result;
- }
-}