MEDIA_GETID(3VOLMGT) Volume Management Library Functions

NAME

media_getid - return the id of a piece of media

SYNOPSIS

cc [flag ...] file ...-lvolmgt [library ...]

#include <volmgt.h>


ulonglong_t media_getid(char *vol_path);

DESCRIPTION

This function is obsolete. The management of removable media by the
Volume Management feature, including vold, has been replaced by
software that supports the Hardware Abstraction Layer (HAL).
Programmatic support for HAL is through the HAL APIs, which are
documented on the HAL web site. See hal(7). The return value of this
function is undefined.


media_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 VALUES

The return from this function is undefined.

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(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|MT-Level | Safe |
+--------------------+-----------------+
|Interface Stability | Obsolete |
+--------------------+-----------------+

SEE ALSO

volmgt_ownspath(3VOLMGT), volmgt_running(3VOLMGT), attributes(7),
hal(7)

March 8, 2007 MEDIA_GETID(3VOLMGT)