/* Copyright (C) 2005-2013 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 . */ /* Ho hum, if fxstatat == fxstatat64 we must get rid of the prototype or gcc will complain since they don't strictly match. */ #define __fxstatat64 __fxstatat64_disable #include #include #include #include #include #include #include #include #include #include #include #include /* Get information about the file NAME in BUF. */ int __fxstatat (int vers, int fd, const char *file, struct stat *st, int flag) { int result; INTERNAL_SYSCALL_DECL (err); #ifdef STAT_IS_KERNEL_STAT # define kst (*st) #else struct kernel_stat kst; #endif #ifdef __NR_newfstatat # ifndef __ASSUME_ATFCTS if (__have_atfcts >= 0) # endif { result = INTERNAL_SYSCALL (newfstatat, err, 4, fd, file, &kst, flag); # ifndef __ASSUME_ATFCTS if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 1) && INTERNAL_SYSCALL_ERRNO (result, err) == ENOSYS) __have_atfcts = -1; else # endif if (!__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 1)) { #ifdef STAT_IS_KERNEL_STAT return 0; #else return __xstat_conv (vers, &kst, st); #endif } else { __set_errno (INTERNAL_SYSCALL_ERRNO (result, err)); return -1; } } #endif if (flag & ~AT_SYMLINK_NOFOLLOW) { __set_errno (EINVAL); return -1; } char *buf = NULL; if (fd != AT_FDCWD && file[0] != '/') { size_t filelen = strlen (file); if (__builtin_expect (filelen == 0, 0)) { __set_errno (ENOENT); return -1; } static const char procfd[] = "/proc/self/fd/%d/%s"; /* Buffer for the path name we are going to use. It consists of - the string /proc/self/fd/ - the file descriptor number - the file name provided. The final NUL is included in the sizeof. A bit of overhead due to the format elements compensates for possible negative numbers. */ size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; buf = alloca (buflen); __snprintf (buf, buflen, procfd, fd, file); file = buf; } if (vers == _STAT_VER_KERNEL) { if (flag & AT_SYMLINK_NOFOLLOW) result = INTERNAL_SYSCALL (lstat, err, 2, file, CHECK_1 ((struct kernel_stat *) st)); else result = INTERNAL_SYSCALL (stat, err, 2, file, CHECK_1 ((struct kernel_stat *) st)); if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) return result; } #ifdef STAT_IS_KERNEL_STAT else { __set_errno (EINVAL); return -1; } #else if (flag & AT_SYMLINK_NOFOLLOW) result = INTERNAL_SYSCALL (lstat, err, 2, file, __ptrvalue (&kst)); else result = INTERNAL_SYSCALL (stat, err, 2, file, __ptrvalue (&kst)); if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) return __xstat_conv (vers, &kst, st); #endif __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); return -1; } libc_hidden_def (__fxstatat) #ifdef XSTAT_IS_XSTAT64 # undef __fxstatat64 strong_alias (__fxstatat, __fxstatat64); libc_hidden_def (__fxstatat64) #endif