media_findname(3VOLMGTVolume Management Library Functiomedia_findname(3VOLMGT)NAMEmedia_findname - convert a supplied name into an absolute pathname that
can be used to access removable media
SYNOPSIS
cc [ flag ... ] file ... -lvolmgt [ library ... ]
#include <volmgt.h>
char *media_findname(char *start);
DESCRIPTIONmedia_findname() converts the supplied start string into an absolute
pathname that can then be used to access a particular piece of media.
The start parameter can be one of the following types of specifica‐
tions:
/dev/... An absolute pathname in /dev, such as
/dev/rdiskette0, in which case a copy of that string
is returned (see NOTES on this page).
/vol/... An absolute Volume Management pathname, such as
/vol/dev/aliases/floppy0 or /vol/dsk/fred. If this
supplied pathname is not a symbolic link, then a copy
of that pathname is returned. If the supplied path‐
name is a symbolic link then it is dereferenced and a
copy of that dereferenced pathname is returned.
volume_name The Volume Management volume name for a particular
volume, such as fred (see fdformat(1) for a descrip‐
tion of how to label floppies). In this case a path‐
name in the Volume Management namespace is returned.
volmgt_symname The Volume Management symbolic name for a device,
such as floppy0 or cdrom2 (see volfs(7FS) for more
information on Volume Management symbolic names), in
which case a pathname in the Volume Management
namespace is returned.
media_type The Volume Management generic media type name. For
example, floppy or cdrom. In this case media_find‐
name() looks for the first piece of media that
matches that media type, starting at 0 (zero) and
continuing on until a match is found (or some fairly
large maximum number is reached). In this case, if a
match is found, a copy of the pathname to the volume
found is returned.
RETURN VALUES
Upon successful completion media_findname() returns a pointer to the
pathname found. In the case of an error a null pointer is returned.
ERRORS
For cases where the supplied start parameter is an absolute pathname,
media_findname() can fail, returning a null string pointer, if an
lstat(2) of that supplied pathname fails. Also, if the supplied abso‐
lute pathname is a symbolic link, media_findname() can fail if a read‐
link(2) of that symbolic link fails, or if a stat(2) of the pathname
pointed to by that symbolic link fails, or if any of the following is
true:
ENXIO The specified absolute pathname was not a character special
device, and it was not a directory with a character special
device in it.
EXAMPLES
Example 1 Sample programs of the media_findname() function.
The following example attempts to find what the Volume Management path‐
name is to a piece of media called fred. Notice that a volmgt_check()
is done first (see the NOTES section on this page).
(void) volmgt_check(NULL);
if ((nm = media_findname("fred")) != NULL) {
(void) printf("media named \"fred\" is at \"%s\"\n", nm);
} else {
(void) printf("media named \"fred\" not found\n");
}
This example looks for whatever volume is in the first floppy drive,
letting media_findname() call volmgt_check() if and only if no floppy
is currently known to be the first floppy drive.
if ((nm = media_findname("floppy0")) != NULL) {
(void) printf("path to floppy0 is \"%s\"\n", nm);
} else {
(void) printf("nothing in floppy0\n");
}
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Unsafe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOcc(1B), fdformat(1), vold(1M), lstat(2), readlink(2), stat(2),
free(3C), malloc(3C), volmgt_check(3VOLMGT), volmgt_inuse(3VOLMGT),
volmgt_root(3VOLMGT), volmgt_running(3VOLMGT), volmgt_symname(3VOLMGT),
attributes(5), volfs(7FS)NOTES
If media_findname() cannot find a match for the supplied name, it per‐
forms a volmgt_check(3VOLMGT) and tries again, so it can be more effi‐
cient to perform volmgt_check() before calling media_findname().
Upon success media_findname() returns a pointer to string which has
been allocated; this should be freed when no longer in use (see
free(3C)).
SunOS 5.10 31 Dec 1996 media_findname(3VOLMGT)
