media_getid(3volmgt) [sunos man page]

media_getid(3VOLMGT)					Volume Management Library Functions				      media_getid(3VOLMGT)

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

       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

       media_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
",
		      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 ALSO

       volmgt_ownspath(3VOLMGT),volmgt_running(3VOLMGT),attributes(5)

SunOS 5.10							    29 Apr1998						      media_getid(3VOLMGT)

volmgt_symname(3VOLMGT) 				Volume Management Library Functions				   volmgt_symname(3VOLMGT)

NAME

       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 vol-
       ume, 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  sup-
       plied 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
",
			   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
");
       } else {
	       (void) printf("path managed as %s
", nm);
       }

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

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.

SunOS 5.10							    31 Dec 1996 					   volmgt_symname(3VOLMGT)