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glibc  2.9
Functions
mkdirat.c File Reference
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <kernel-features.h>
#include <sysdep-cancel.h>

Go to the source code of this file.

Functions

int mkdirat (int fd, const char *file, mode_t mode)

Function Documentation

int mkdirat ( int  fd,
const char *  file,
mode_t  mode 
)

Definition at line 32 of file mkdirat.c.

{
  int res;

#ifdef __NR_mkdirat
#  ifndef __ASSUME_ATFCTS
  if (__have_atfcts >= 0)
# endif
    {
      res = INLINE_SYSCALL (mkdirat, 3, fd, file, mode);
# ifndef __ASSUME_ATFCTS
      if (res == -1 && res == ENOSYS)
       __have_atfcts = -1;
      else
# endif
       return res;
    }
#endif

#ifndef __ASSUME_ATFCTS
  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);
  res = INTERNAL_SYSCALL (mkdir, err, 2, file, mode);

  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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