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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 <sysdep.h>
#include <kernel-features.h>
#include <sys/syscall.h>
#include <bp-checks.h>

Go to the source code of this file.

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 38 of file fxstatat.c.

{
  if (vers != _STAT_VER_KERNEL && vers != _STAT_VER_LINUX)
    {
      __set_errno (EINVAL);
      return -1;
    }

  int res;

#ifdef __NR_newfstatat
# ifndef __ASSUME_ATFCTS
  if (__have_atfcts >= 0)
# endif
    {
      res = INLINE_SYSCALL (newfstatat, 4, fd, file, st, flag);
# ifndef __ASSUME_ATFCTS
      if (res == -1 && errno == ENOSYS)
       __have_atfcts = -1;
      else
# endif
       return res;
    }
#endif

#ifndef __ASSUME_ATFCTS
  if ((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;
    }

  INTERNAL_SYSCALL_DECL (err);

  if (flag & AT_SYMLINK_NOFOLLOW)
    res = INTERNAL_SYSCALL (lstat, err, 2, file, CHECK_1 (st));
  else
    res = INTERNAL_SYSCALL (stat, err, 2, file, CHECK_1 (st));

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

  return res;
#endif
}

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