VASResult shore_vas::lookup(
const Path pathname,
lrid_t *result,
PermOp targetperm = Permissions::op_read,
bool errorIfNotFound = FALSE,
bool follow = FALSE
);
// server only:
VASResult shore_vas::_lookup(
const Path pathname,
bool *found,
lrid_t *result = 0,
bool errorIfNotFound = TRUE,
PermOp targetperm = Permissions::op_read,
bool follow = TRUE,
serial_t *file = 0
);
// server only:
VASResult shore_vas::_lookup(
lrid_t &dir,
const Path pathname,
PermOp pathperm,
PermOp targetperm,
bool *found,
lrid_t *result,
serial_t *file,
bool errorIfNotFound = TRUE,
bool follow = TRUE
);
If an object with such a pathname exists, its object identifier is returned in *result. If no such object exists, *result is unchanged.
If follow is TRUE, and the pathname encounters symbolic links or cross-references along the way, they will be followed, otherwise the search will terminate at the point at which a symbolic link or cross-reference is found. If the path name does not identify an object, and errIfNotFound is TRUE, all forms of lookup issue an error message and return ST_FAILURE. If errIfNotFound if FALSE, they are silent, but indicate that no such object was found as follows: lookup returns ST_FAILURE, and both forms of _lookup return ST_OK. *Found, where present, is set to TRUE if such an object exists, and to FALSE if not.
At the end of the search, if an object is found, it is checked for the permissions given in targetperm. Along the path, lookup and the first form of _lookup require search (execute) permissions; the second form of _lookup checks for the permissions indicated in pathperm.
Both forms of _lookup return the logical file identifier for the Shore Storage Manager file in which the object resides. In the first form, the file identifier is returned only if file is a non-null pointer.
Deadlocks can occur while locks are being acquired. See transaction(svas) for information about deadlocks.
A complete list of errors is in errors(svas).