Проект OpenNet: MAN media_getid (3) Библиотечные вызовы (FreeBSD и Linux)

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media_getid (3)

>> media_getid (3) ( Solaris man: Библиотечные вызовы )

NAME

media_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);

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This function is obsolete. The management of removable media by the Volume Management feature, including vold, has been replaced by software that supports the Hardware Abstraction Layer (HAL).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(5). 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.