41 lines
1 KiB
C
41 lines
1 KiB
C
/* VTreeFS - link.c - by Alen Stojanov and David van Moolenbroek */
|
|
|
|
#include "inc.h"
|
|
|
|
/*===========================================================================*
|
|
* fs_rdlink *
|
|
*===========================================================================*/
|
|
PUBLIC int fs_rdlink(void)
|
|
{
|
|
/* Retrieve symbolic link target.
|
|
*/
|
|
char path[PATH_MAX];
|
|
struct inode *node;
|
|
size_t len;
|
|
int r;
|
|
|
|
if ((node = find_inode(fs_m_in.REQ_INODE_NR)) == NULL)
|
|
return EINVAL;
|
|
|
|
/* Call the rdlink hook. */
|
|
assert(vtreefs_hooks->rdlink_hook != NULL);
|
|
assert(!is_inode_deleted(node)); /* symlinks cannot be opened */
|
|
|
|
r = vtreefs_hooks->rdlink_hook(node, path, sizeof(path),
|
|
get_inode_cbdata(node));
|
|
if (r != OK) return r;
|
|
|
|
len = strlen(path);
|
|
assert(len > 0 && len < sizeof(path));
|
|
|
|
if (len > fs_m_in.REQ_MEM_SIZE)
|
|
len = fs_m_in.REQ_MEM_SIZE;
|
|
|
|
/* Copy out the result. */
|
|
r = sys_safecopyto(fs_m_in.m_source, fs_m_in.REQ_GRANT, 0,
|
|
(vir_bytes) path, len, D);
|
|
if (r != OK) return r;
|
|
|
|
fs_m_out.RES_NBYTES = len;
|
|
return OK;
|
|
}
|