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132 lines
3.6 KiB
C
132 lines
3.6 KiB
C
/* Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sysdep.h>
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void
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attribute_hidden
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__atfct_seterrno_2 (int errval, int fd1, const char *buf1, int fd2,
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const char *buf2)
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{
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if (errval == ENOTDIR && (buf1 != NULL || buf2 != NULL))
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{
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/* This can mean either the file descriptor is invalid or
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/proc is not mounted. */
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struct stat64 st;
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if (buf1 != NULL)
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{
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if (__fxstat64 (_STAT_VER, fd1, &st) != 0)
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/* errno is already set correctly. */
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return;
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/* If /proc is not mounted there is nothing we can do. */
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if (S_ISDIR (st.st_mode)
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&& (__xstat64 (_STAT_VER, "/proc/self/fd", &st) != 0
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|| !S_ISDIR (st.st_mode)))
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{
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errval = ENOSYS;
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goto out;
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}
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}
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if (buf2 != NULL)
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{
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if (__fxstat64 (_STAT_VER, fd2, &st) != 0)
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/* errno is already set correctly. */
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return;
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/* If /proc is not mounted there is nothing we can do. */
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if (S_ISDIR (st.st_mode)
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&& (__xstat64 (_STAT_VER, "/proc/self/fd", &st) != 0
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|| !S_ISDIR (st.st_mode)))
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errval = ENOSYS;
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}
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}
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out:
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__set_errno (errval);
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}
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/* Rename the file OLD relative to OLDFD to NEW relative to NEWFD. */
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int
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renameat (oldfd, old, newfd, new)
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int oldfd;
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const char *old;
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int newfd;
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const char *new;
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{
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static const char procfd[] = "/proc/self/fd/%d/%s";
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char *bufold = NULL;
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if (oldfd != AT_FDCWD && old[0] != '/')
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{
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size_t filelen = strlen (old);
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/* Buffer for the path name we are going to use. It consists of
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- the string /proc/self/fd/
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- the file descriptor number
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- the file name provided.
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The final NUL is included in the sizeof. A bit of overhead
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due to the format elements compensates for possible negative
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numbers. */
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size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen;
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bufold = alloca (buflen);
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__snprintf (bufold, buflen, procfd, oldfd, old);
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old = bufold;
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}
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char *bufnew = NULL;
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if (newfd != AT_FDCWD && new[0] != '/')
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{
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size_t filelen = strlen (new);
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/* Buffer for the path name we are going to use. It consists of
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- the string /proc/self/fd/
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- the file descriptor number
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- the file name provided.
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The final NUL is included in the sizeof. A bit of overhead
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due to the format elements compensates for possible negative
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numbers. */
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size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen;
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bufnew = alloca (buflen);
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__snprintf (bufnew, buflen, procfd, newfd, new);
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new = bufnew;
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}
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INTERNAL_SYSCALL_DECL (err);
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int result = INTERNAL_SYSCALL (rename, err, 2, old, new);
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if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 0))
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{
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__atfct_seterrno_2 (INTERNAL_SYSCALL_ERRNO (result, err), newfd, bufnew,
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oldfd, bufold);
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result = -1;
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}
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return result;
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}
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