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glibc/io/openat.c
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/* Copyright (C) 2005-2016 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 <fcntl.h> | |
#include <stdarg.h> | |
#include <stddef.h> | |
#include <stdio.h> | |
#include <sys/stat.h> | |
#include <kernel-features.h> | |
#include <libc-internal.h> | |
/* Some mostly-generic code (e.g. sysdeps/posix/getcwd.c) uses this variable | |
if __ASSUME_ATFCTS is not defined. */ | |
#ifndef __ASSUME_ATFCTS | |
int __have_atfcts; | |
#endif | |
/* Open FILE with access OFLAG. Interpret relative paths relative to | |
the directory associated with FD. If O_CREAT or O_TMPFILE is in OFLAG, a | |
third argument is the file protection. */ | |
int | |
__openat (int fd, const char *file, int oflag, ...) | |
{ | |
int mode; | |
if (file == NULL) | |
{ | |
__set_errno (EINVAL); | |
return -1; | |
} | |
if (fd != AT_FDCWD && file[0] != '/') | |
{ | |
/* Check FD is associated with a directory. */ | |
struct stat64 st; | |
if (__fxstat64 (_STAT_VER, fd, &st) != 0) | |
return -1; | |
if (!S_ISDIR (st.st_mode)) | |
{ | |
__set_errno (ENOTDIR); | |
return -1; | |
} | |
} | |
if (__OPEN_NEEDS_MODE (oflag)) | |
{ | |
va_list arg; | |
va_start (arg, oflag); | |
mode = va_arg (arg, int); | |
va_end (arg); | |
ignore_value (mode); | |
} | |
__set_errno (ENOSYS); | |
return -1; | |
} | |
libc_hidden_def (__openat) | |
weak_alias (__openat, openat) | |
stub_warning (openat) | |
/* __openat_2 is a generic wrapper that calls __openat. | |
So give a stub warning for that symbol too. */ | |
stub_warning (__openat_2) |