volmgt_symname

, volmgt_symdev

- convert between Volume Management symbolic names, and the devices that correspond to them

Synopsis

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



char *volmgt_symname(char *pathname);

char *volmgt_symdev(char *symname);

Description

These two routines compliment each other, translating between Volume Management's symbolic name for a device, called a symname, and the /dev pathname for that same device.

volmgt_symname( ) converts a supplied /dev pathname to a symname, Volume Management's idea of that device's symbolic name (see volfs(7FS) for a description of Volume Management symbolic names).

volmgt_symdev( ) does the opposite conversion, converting between a symname, Volume Management's idea of a device's symbolic name for a volume, to the /dev pathname for that device.

Return Values

volmgt_symname( ) returns the symbolic name for the device pathname supplied, and volmgt_symdev( ) returns the device pathname for the supplied symbolic name.

These strings are allocated upon success, and therefore must be freed by the caller when they are no longer needed (see free(3C)).

Errors

volmgt_symname( ) can fail, returning a null string pointer, if a stat(2) of the supplied pathname fails, or if an open(2) of /dev/volctl fails, or if any of the following is true:

ENXIO

Volume Management is not running.

EINTR

An interrupt signal was detected while trying to convert the supplied pathname to a symname.

volmgt_symdev( ) can fail if an open(2) of /dev/volctl fails, or if any of the following is true:

ENXIO

Volume Management is not running.

EINTR

An interrupt signal was detected while trying to convert the supplied symname to a /dev pathname.

Examples

Example 1 Testing Floppies

The following tests how many floppies Volume Management currently sees in floppy drives (up to 10):

for (i=0; i < 10; i++) {
        (void) sprintf(path, "floppy%d", i);
        if (volmgt_symdev(path) != NULL) {
                (void) printf("volume %s is in drive %d\n",
                    path, i);
        }
}

Example 2 Finding The Symbolic Name

This code finds out what symbolic name (if any) Volume Management has for /dev/rdsk/c0t6d0s2:

if ((nm = volmgt_symname("/dev/rdsk/c0t6d0s2")) == NULL) {
        (void) printf("path not managed\n");
} else {
        (void) printf("path managed as %s\n", nm);
}

Attributes

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

See Also

cc(1B), vold(1M), open(2), stat(2), free(3C), malloc(3C), volmgt_check(3VOLMGT), volmgt_inuse(3VOLMGT), volmgt_running(3VOLMGT), attributes(5), volfs(7FS)

Notes

These routines only work when Volume Management is running.

Bugs

There should be a straightforward way to query Volume Management for a list of all media types it's managing, and how many of each type are being managed.