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| Volume Management Library Functions | volmgt_symname(3VOLMGT) |
| | volmgt_symname, volmgt_symdev - convert between Volume Management symbolic names, and the devices that correspond to them |
SYNOPSIS
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cc [ flag ... ] file ... -lvolmgt [ library ... ]
#include <volmgt.h>
char *volmgt_symname(char *pathname); |
| | char *volmgt_symdev(char *symname); |
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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.
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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)).
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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:
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ENXIO
- Volume Management is not running.
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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.
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EINTR
- An interrupt signal was detected while trying to convert the supplied symname to a /dev pathname.
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| | Example 1. Testing Floppies
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The following tests how many floppies Volume Management currently sees in floppy drives (up to 10):
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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);
}
}
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Example 2. Finding The Symbolic Name
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This code finds out what symbolic name (if any) Volume Management has for /dev/rdsk/c0t6d0s2:
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if ((nm = volmgt_symname("/dev/rdsk/c0t6d0s2")) == NULL) {
(void) printf("path not managed\n");
} else {
(void) printf("path managed as %s\n", nm);
}
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See attributes(5) for descriptions of the following
attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT-Level | MT-Safe |
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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)
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These routines only work when Volume Management is running.
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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.
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