media_getid(3VOLMGT) Volume Management Library Functions media_getid(3VOLMGT)NAMEmedia_getid - return the id of a piece of media
SYNOPSIS
cc [flag ...] file ...−lvolgmt [library ...]
#include <volmgt.h>
ulonglong_t media_getid(char *vol_path);
DESCRIPTIONmedia_getid() returns the id of a piece of media. Volume Management
must be running. See volmgt_running(3VOLMGT).
PARAMETERS
vol_path Path to the block or character special device.
RETURN VALUESmedia_getid() returns the id of the volume. This value is unique for
each volume. If media_getid() returns 0, the path provided is not
valid, for example, it is a block or char device.
EXAMPLES
Example 1: Using media_getid()
The following example first checks if Volume Management is running,
then checks the volume management name space for path, and then returns
the id for the piece of media.
char *path;
...
if (volmgt_running()) {
if (volmgt_ownspath(path)) {
(void) printf("id of %s is %lld\n",
path, media_getid(path));
}
}
If a program using media_getid() does not check whether or not Volume
Management is running, then any NULL return value will be ambiguous, as
it could mean that either Volume Management does not have path in its
name space, or Volume Management is not running.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│MT Level │Safe │
├─────────────────────────────┼─────────────────────────────┤
│Commitment Level │Public │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOvolmgt_ownspath(3VOLMGT),volmgt_running(3VOLMGT),attributes(5)SunOS 5.10 29 Apr1998 media_getid(3VOLMGT)
