28 lines
588 B
C
28 lines
588 B
C
|
#include <lib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <minix/safecopies.h>
|
||
|
|
|
||
|
|
int
|
||
|
|
checkperms(endpoint_t endpt, char *path, size_t size)
|
||
|
|
{
|
||
|
|
cp_grant_id_t grant;
|
||
|
|
message m;
|
||
|
|
int r;
|
||
|
|
|
||
|
|
if ((grant = cpf_grant_direct(VFS_PROC_NR, (vir_bytes) path, size,
|
||
|
|
CPF_READ | CPF_WRITE)) == GRANT_INVALID)
|
||
|
|
return -1; /* called function sets errno */
|
||
|
|
|
||
|
|
memset(&m, 0, sizeof(m));
|
||
|
|
m.VFS_CHECKPERMS_ENDPT = endpt;
|
||
|
|
m.VFS_CHECKPERMS_GRANT = grant;
|
||
|
|
m.VFS_CHECKPERMS_COUNT = size;
|
||
|
|
|
||
|
|
r = _syscall(VFS_PROC_NR, VFS_CHECKPERMS, &m);
|
||
|
|
|
||
|
|
cpf_revoke(grant); /* does not touch errno */
|
||
|
|
|
||
|
|
return r;
|
||
|
|
}
|