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Hurd: readlinkat

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Samuel Thibault 2012-05-10 15:29:55 -07:00 committed by Roland McGrath
parent db65366043
commit b29d4053f0
2 changed files with 67 additions and 2 deletions
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ChangeLog
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@ -1,5 +1,8 @@
2012-05-10 Samuel Thibault <samuel.thibault@ens-lyon.org>
* sysdeps/mach/hurd/readlinkat.c: New file, heavily derived from
sysdeps/mach/hurd/readlink.c.
* posix/tst-sysconf.c (posix_options): Only use
_POSIX_PRIORITIZED_IO, _POSIX_PRIORITY_SCHEDULING, and
_POSIX_SYNCHRONIZED_IO when they are defined
@ -16,8 +19,6 @@
(_POSIX_PRIORITIZED_IO): Undefine macro.
(_POSIX_SPIN_LOCKS): Define macro to -1.
2012-05-10 Samuel Thibault <samuel.thibault@ens-lyon.org>
* bits/sigaction.h [__USE_XOPEN2K8]: Define SA_RESTART,
SA_NODEFER, SA_RESETHAND.
* sysdeps/mach/hurd/bits/fcntl.h [__USE_XOPEN2K8]: Define

64
sysdeps/mach/hurd/readlinkat.c Normal file
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/* Copyright (C) 1991-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <unistd.h>
#include <hurd.h>
#include <hurd/paths.h>
#include <hurd/fd.h>
#include <fcntl.h>
#include <string.h>
/* Read the contents of the symbolic link FILE_NAME relative to FD into no more
than LEN bytes of BUF. The contents are not null-terminated.
Returns the number of characters read, or -1 for errors. */
ssize_t
readlinkat (fd, file_name, buf, len)
int fd;
const char *file_name;
char *buf;
size_t len;
{
error_t err;
file_t file;
struct stat64 st;
file = __file_name_lookup_at (fd, 0, file_name, O_READ | O_NOLINK, 0);
if (file == MACH_PORT_NULL)
return -1;
err = __io_stat (file, &st);
if (! err)
if (S_ISLNK (st.st_mode))
{
char *rbuf = buf;
err = __io_read (file, &rbuf, &len, 0, len);
if (!err && rbuf != buf)
{
memcpy (buf, rbuf, len);
__vm_deallocate (__mach_task_self (), (vm_address_t)rbuf, len);
}
}
else
err = EINVAL;
__mach_port_deallocate (__mach_task_self (), file);
return err ? __hurd_fail (err) : len;
}
libc_hidden_def (readlinkat)