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NAME

media_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);

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This function is obsolete. The management of removable media by the Volume Management feature, including vold, has been replaced by software that supports the Hardware Abstraction Layer (HAL).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

/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).

volume_name

The volume name for a particular volume, such as fred (see fdformat(1) for a description of how to label floppies).

volmgt_symname

The symbolic name for a device, such as floppy0 or cdrom2.

media_type

The generic media type name. For example, floppy or cdrom. In this case media_findname() 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

The return from this function is undefined.  

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 absolute pathname is a symbolic link, media_findname() can fail if a readlink(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 pathname 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 Interface Stability

SEE ALSO

cc(1B), fdformat(1), 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), hal(5)  

NOTES

If media_findname() cannot find a match for the supplied name, it performs a volmgt_check(3VOLMGT) and tries again, so it can be more efficient 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)).

Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUES

ERRORS

EXAMPLES

ATTRIBUTES

SEE ALSO

NOTES

Партнёры:

Хостинг: