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glibc  2.9
Defines | Functions
fxstatat.c File Reference
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <kernel_stat.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <bp-checks.h>
#include <kernel-features.h>
#include <xstatconv.h>
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Defines

#define __fxstatat64   __fxstatat64_disable

Functions

int __fxstatat (int vers, int fd, const char *file, struct stat *st, int flag)

Define Documentation

#define __fxstatat64   __fxstatat64_disable

Definition at line 21 of file fxstatat.c.


Function Documentation

int __fxstatat ( int  vers,
int  fd,
const char *  file,
struct stat st,
int  flag 
)

Definition at line 49 of file fxstatat.c.

{
  int result;
  INTERNAL_SYSCALL_DECL (err);
  struct stat64 st64;

#ifdef __NR_fstatat64
# ifndef __ASSUME_ATFCTS
  if (__have_atfcts >= 0)
# endif
    {
      result = INTERNAL_SYSCALL (fstatat64, err, 4, fd, file, &st64, 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))
         return __xstat32_conv (vers, &st64, st);
       else
         {
           __set_errno (INTERNAL_SYSCALL_ERRNO (result, err));
           return -1;
         }
    }
#endif

#ifndef __ASSUME_ATFCTS
  if (__builtin_expect (flag & ~AT_SYMLINK_NOFOLLOW, 0))
    {
      __set_errno (EINVAL);
      return -1;
    }

  char *buf = NULL;

  if (fd != AT_FDCWD && file[0] != '/')
    {
      size_t filelen = strlen (file);
      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 __ASSUME_STAT64_SYSCALL == 0
  struct kernel_stat kst;
# endif
  if (vers == _STAT_VER_KERNEL)
    {
      if (flag & AT_SYMLINK_NOFOLLOW)
       result = INTERNAL_SYSCALL (lstat, err, 2, CHECK_STRING (file),
                               CHECK_1 ((struct kernel_stat *) st));
      else
       result = INTERNAL_SYSCALL (stat, err, 2, CHECK_STRING (file),
                               CHECK_1 ((struct kernel_stat *) st));
      goto out;
    }

# if __ASSUME_STAT64_SYSCALL > 0

  if (flag & AT_SYMLINK_NOFOLLOW)
    result = INTERNAL_SYSCALL (lstat64, err, 2, CHECK_STRING (file),
                            __ptrvalue (&st64));
  else
    result = INTERNAL_SYSCALL (stat64, err, 2, CHECK_STRING (file),
                            __ptrvalue (&st64));
  if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1))
    return __xstat32_conv (vers, &st64, st);
# else
#  if defined __NR_stat64
  /* To support 32 bit UIDs, we have to use stat64.  The normal stat
     call only returns 16 bit UIDs.  */
  if (! __have_no_stat64)
    {
      if (flag & AT_SYMLINK_NOFOLLOW)
       result = INTERNAL_SYSCALL (lstat64, err, 2, CHECK_STRING (file),
                               __ptrvalue (&st64));
      else
       result = INTERNAL_SYSCALL (stat64, err, 2, CHECK_STRING (file),
                               __ptrvalue (&st64));

      if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1))
       result = __xstat32_conv (vers, &st64, st);

      if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)
         || INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS)
       goto out;

      __have_no_stat64 = 1;
    }
#  endif
  if (flag & AT_SYMLINK_NOFOLLOW)
    result = INTERNAL_SYSCALL (lstat, err, 2, CHECK_STRING (file),
                            __ptrvalue (&kst));
  else
    result = INTERNAL_SYSCALL (stat, err, 2, CHECK_STRING (file),
                            __ptrvalue (&kst));
  if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1))
    return __xstat_conv (vers, &kst, st);
# endif  /* __ASSUME_STAT64_SYSCALL  */

 out:
  if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 0))
    {
      __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf);
      result = -1;
    }

  return result;
#endif
}

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