freebsd-skq/lib/libc/gen/devname.3
phk d0fd2f76cf Add code to devname(3) so it can find the names of devices which
were not present when dev_mkdb(8) was run.

First the dev_mkdb(8) database is searched, this caters for non-DEVFS
cases where people have renamed a device.

If that fails we ask the kernel using sysctl kern.devname if the device
driver has put a name in the dev_t.  This covers DEVFS cloned devices.

If that also fails we format a string which isn't entirely useless.
2000-09-09 11:39:59 +00:00

73 lines
2.6 KiB
Groff

.\" Copyright (c) 1993
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.\" @(#)devname.3 8.2 (Berkeley) 4/29/95
.\" $FreeBSD$
.\"
.Dd April 29, 1995
.Dt DEVNAME 3
.Os BSD 4.4
.Sh NAME
.Nm devname
.Nd get device name
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.Fd #include <sys/stat.h>
.Fd #include <stdlib.h>
.Ft char *
.Fn devname "dev_t dev" "mode_t type"
.Sh DESCRIPTION
The
.Fn devname
function returns a pointer to the name of the block or character
device in
.Dq Pa /dev
with a device number of
.Fa dev ,
and a file type matching the one encoded in
.Fa type
which must be one of S_IFBLK or S_IFCHR.
If no device matches the specified values, or no information is
available, NULL is returned.
.Pp
The traditional display for applications when no device is
found is the string
.Dq ?? .
.Sh SEE ALSO
.Xr stat 2 ,
.Xr dev_mkdb 8
.Sh HISTORY
The
.Fn devname
function call appeared in
.Bx 4.4 .