usr/src/lib/libc/port/sys/readlink.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25
  26 #include "lint.h"
  27 #include <sys/syscall.h>
  28 #include <sys/unistd.h>
  29 #include <sys/fcntl.h>
  30
  31 ssize_t
  32 readlinkat(int fd, const char *path, char *buf, size_t bufsize)
  33 {
  34         sysret_t rval;
  35         int error;
  36
  37         error = __systemcall(&rval, SYS_readlinkat, fd, path, buf, bufsize);
  38         if (error)
  39                 (void) __set_errno(error);
  40         return ((ssize_t)rval.sys_rval1);
  41 }
  42
  43 #pragma weak _readlink = readlink
  44 ssize_t
  45 readlink(const char *path, char *buf, size_t bufsize)
  46 {
  47         return (readlinkat(AT_FDCWD, path, buf, bufsize));
  48 }