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glibc  2.9
Functions
renameat.c File Reference
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <kernel-features.h>
#include <sysdep.h>

Go to the source code of this file.

Functions

void attribute_hidden __atfct_seterrno_2 (int errval, int fd1, const char *buf1, int fd2, const char *buf2)
int renameat (int oldfd, const char *old, int newfd, const char *new)

Function Documentation

void attribute_hidden __atfct_seterrno_2 ( int  errval,
int  fd1,
const char *  buf1,
int  fd2,
const char *  buf2 
)

Definition at line 30 of file renameat.c.

{
  if (buf1 != NULL || buf2 != NULL)
    {
      struct stat64 st;

      if (errval == ENOTDIR)
       {
         /* This can mean either the file descriptor is invalid or
            /proc is not mounted.  */
         if (buf1 != NULL)
           {
             if (__fxstat64 (_STAT_VER, fd1, &st) != 0)
              /* errno is already set correctly.  */
              return;

             /* If /proc is not mounted there is nothing we can do.  */
             if (S_ISDIR (st.st_mode)
                && (__xstat64 (_STAT_VER, "/proc/self/fd", &st) != 0
                    || !S_ISDIR (st.st_mode)))
              {
                errval = ENOSYS;
                goto out;
              }
           }

         if (buf2 != NULL)
           {
             if (__fxstat64 (_STAT_VER, fd2, &st) != 0)
              /* errno is already set correctly.  */
              return;

             /* If /proc is not mounted there is nothing we can do.  */
             if (S_ISDIR (st.st_mode)
                && (__xstat64 (_STAT_VER, "/proc/self/fd", &st) != 0
                    || !S_ISDIR (st.st_mode)))
              errval = ENOSYS;
           }
       }
      else if (errval == ENOENT)
       {
         /* This could mean the file descriptor is not valid.  We
            reuse BUF for the stat call.  Find the slash after the
            file descriptor number.  */
         if (buf1 != NULL)
           {
             *(char *) strchr (buf1 + sizeof "/proc/self/fd", '/') = '\0';

             int e = __lxstat64 (_STAT_VER, buf1, &st);
             if ((e == -1 && errno == ENOENT)
                ||(e == 0 && !S_ISLNK (st.st_mode)))
              {
                errval = EBADF;
                goto out;
              }
           }

         if (buf2 != NULL)
           {
             *(char *) strchr (buf2 + sizeof "/proc/self/fd", '/') = '\0';

             int e = __lxstat64 (_STAT_VER, buf2, &st);
             if ((e == -1 && errno == ENOENT)
                ||(e == 0 && !S_ISLNK (st.st_mode)))
              errval = EBADF;
           }
       }
    }

 out:
  __set_errno (errval);
}

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int renameat ( int  oldfd,
const char *  old,
int  newfd,
const char *  new 
)

Definition at line 108 of file renameat.c.

{
  int result;

#ifdef __NR_renameat
# ifndef __ASSUME_ATFCTS
  if (__have_atfcts >= 0)
# endif
    {
      result = INLINE_SYSCALL (renameat, 4, oldfd, old, newfd, new);
# ifndef __ASSUME_ATFCTS
      if (result == -1 && errno == ENOSYS)
       __have_atfcts = -1;
      else
# endif
       return result;
    }
#endif

#ifndef __ASSUME_ATFCTS
  static const char procfd[] = "/proc/self/fd/%d/%s";
  char *bufold = NULL;

  if (oldfd != AT_FDCWD && old[0] != '/')
    {
      size_t filelen = strlen (old);
      /* 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;
      bufold = alloca (buflen);

      __snprintf (bufold, buflen, procfd, oldfd, old);
      old = bufold;
    }

  char *bufnew = NULL;

  if (newfd != AT_FDCWD && new[0] != '/')
    {
      size_t filelen = strlen (new);
      /* 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;
      bufnew = alloca (buflen);

      __snprintf (bufnew, buflen, procfd, newfd, new);
      new = bufnew;
    }

  INTERNAL_SYSCALL_DECL (err);

  result = INTERNAL_SYSCALL (rename, err, 2, old,  new);

  if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 0))
    {
      __atfct_seterrno_2 (INTERNAL_SYSCALL_ERRNO (result, err), newfd, bufnew,
                       oldfd, bufold);
      result = -1;
    }

  return result;
#endif
}

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