forked from Imagelibrary/rtems
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/**
|
|
* @file
|
|
*
|
|
* @brief Read Value of a Symbolic Link
|
|
* @ingroup libcsupport
|
|
*/
|
|
|
|
/*
|
|
* COPYRIGHT (c) 1989-1999.
|
|
* On-Line Applications Research Corporation (OAR).
|
|
*
|
|
* The license and distribution terms for this file may be
|
|
* found in the file LICENSE in this distribution or at
|
|
* http://www.rtems.com/license/LICENSE.
|
|
*/
|
|
|
|
#if HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <unistd.h>
|
|
|
|
#include <rtems/libio_.h>
|
|
|
|
/**
|
|
* POSIX 1003.1b - X.X.X - XXX
|
|
*/
|
|
ssize_t readlink( const char *path, char *buf, size_t bufsize )
|
|
{
|
|
ssize_t rv = 0;
|
|
rtems_filesystem_eval_path_context_t ctx;
|
|
int eval_flags = RTEMS_FS_FOLLOW_HARD_LINK;
|
|
const rtems_filesystem_location_info_t *currentloc =
|
|
rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
|
|
const rtems_filesystem_operations_table *ops = currentloc->mt_entry->ops;
|
|
rtems_filesystem_node_types_t type = (*ops->node_type_h)( currentloc );
|
|
|
|
if ( type == RTEMS_FILESYSTEM_SYM_LINK ) {
|
|
rv = (*ops->readlink_h)( currentloc, buf, bufsize );
|
|
} else {
|
|
rtems_filesystem_eval_path_error( &ctx, EINVAL );
|
|
rv = -1;
|
|
}
|
|
|
|
rtems_filesystem_eval_path_cleanup( &ctx );
|
|
|
|
return rv;
|
|
}
|