libc/sysdeps/linux/common/lstat.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * lstat() for uClibc
   4  *
   5  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
   6  *
   7  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   8  */
   9
  10 #include <sys/syscall.h>
  11 #include <unistd.h>
  12 #include <sys/stat.h>
  13
  14 #if defined __NR_fstatat64 && !defined __NR_lstat
  15 # include <fcntl.h>
  16
  17 int lstat(const char *file_name, struct stat *buf)
  18 {
  19         return fstatat(AT_FDCWD, file_name, buf, AT_SYMLINK_NOFOLLOW);
  20 }
  21 libc_hidden_def(lstat)
  22
  23 #elif __WORDSIZE == 64 && defined __NR_newfstatat
  24 # include <fcntl.h>
  25
  26 int lstat(const char *file_name, struct stat *buf)
  27 {
  28         return fstatat(AT_FDCWD, file_name, buf, AT_SYMLINK_NOFOLLOW);
  29 }
  30 libc_hidden_def(lstat)
  31
  32 /* For systems which have both, prefer the old one */
  33 #else
  34 # include "xstatconv.h"
  35 int lstat(const char *file_name, struct stat *buf)
  36 {
  37         int result;
  38 # ifdef __NR_lstat64
  39         /* normal stat call has limited values for various stat elements
  40          * e.g. uid device major/minor etc.
  41          * so we use 64 variant if available
  42          * in order to get newer versions of stat elements
  43          */
  44         struct kernel_stat64 kbuf;
  45         result = INLINE_SYSCALL(lstat64, 2, file_name, &kbuf);
  46         if (result == 0) {
  47                 __xstat32_conv(&kbuf, buf);
  48         }
  49 # else
  50         struct kernel_stat kbuf;
  51
  52         result = INLINE_SYSCALL(lstat, 2, file_name, &kbuf);
  53         if (result == 0) {
  54                 __xstat_conv(&kbuf, buf);
  55         }
  56 # endif /* __NR_lstat64 */
  57         return result;
  58 }
  59 libc_hidden_def(lstat)
  60
  61 # if ! defined __NR_fstatat64 && ! defined __NR_lstat64
  62 strong_alias_untyped(lstat,lstat64)
  63 libc_hidden_def(lstat64)
  64 # endif
  65
  66 #endif /* __NR_fstatat64 */