volmgt_release

- release removable media device reservation

Synopsis

cc [ flag ... ] file ... -lvolmgt [ library ... ]
#include <volmgt.h>



int volmgt_release(char *dev);

Description

The volmgt_release() routine releases the removable media device reservation specified as dev. See volmgt_acquire(3VOLMGT) for a description of dev.

If dev is reserved by the caller, volmgt_release() updates the internal device reservation database to indicate that the device is no longer reserved. If the requested device is reserved by another process, the release attempt fails and errno is set to 0.

Return Values

Upon successful completion, volmgt_release returns a non-zero value. Upon failure, 0 is returned.

Errors

On failure, volmgt_release() returns 0, and sets errno for one of the following conditions:

EINVAL

dev was invalid or missing.

EBUSY

dev was not reserved by the caller.

Examples

Example 1 Using volmgt_release()

In the following example, Volume Management is running, and the first floppy drive is reserved, accessed and released.

#include <volmgt.h>
char *errp;
if (!volmgt_acquire("floppy0", "FileMgr", 0, &errp,
    NULL)) {
    /* handle error case */
    . . .
}
/* floppy acquired - now access it */
if (!volmgt_release("floppy0")) {
    /* handle error case */
    . . .
}

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

vold(1M), volmgt_acquire(3VOLMGT), attributes(5)