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Annotation of src/lib/libc/gen/devname.3, Revision 1.11

1.11    ! agc         1: .\"    $NetBSD: devname.3,v 1.10 2003/04/16 13:34:36 wiz Exp $
1.2       cgd         2: .\"
1.1       cgd         3: .\" Copyright (c) 1993
                      4: .\"    The Regents of the University of California.  All rights reserved.
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                      6: .\" Redistribution and use in source and binary forms, with or without
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                      9: .\" 1. Redistributions of source code must retain the above copyright
                     10: .\"    notice, this list of conditions and the following disclaimer.
                     11: .\" 2. Redistributions in binary form must reproduce the above copyright
                     12: .\"    notice, this list of conditions and the following disclaimer in the
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1.11    ! agc        14: .\" 3. Neither the name of the University nor the names of its contributors
1.1       cgd        15: .\"    may be used to endorse or promote products derived from this software
                     16: .\"    without specific prior written permission.
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                     18: .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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1.4       perry      30: .\"     @(#)devname.3  8.2 (Berkeley) 4/29/95
1.1       cgd        31: .\"
1.4       perry      32: .Dd April 29, 1995
1.1       cgd        33: .Dt DEVNAME 3
1.6       garbled    34: .Os
1.1       cgd        35: .Sh NAME
                     36: .Nm devname
                     37: .Nd get device name
1.5       perry      38: .Sh LIBRARY
                     39: .Lb libc
1.1       cgd        40: .Sh SYNOPSIS
1.10      wiz        41: .In stdlib.h
                     42: .In sys/stat.h
1.1       cgd        43: .Ft char *
                     44: .Fn devname "dev_t dev" "mode_t type"
                     45: .Sh DESCRIPTION
                     46: The
                     47: .Fn devname
                     48: function returns a pointer to the name of the block or character
                     49: device in
                     50: .Dq Pa /dev
                     51: with a device number of
                     52: .Fa dev ,
                     53: and a file type matching the one encoded in
                     54: .Fa type
                     55: which must be one of S_IFBLK or S_IFCHR.
1.7       simonb     56: The device name is cached so that multiple calls with the same
                     57: .Fa dev
                     58: and
                     59: .Fa type
                     60: do not require additional queries of the device database file.
1.1       cgd        61: If no device matches the specified values, or no information is
1.9       wiz        62: available,
                     63: .Dv NULL
                     64: is returned.
1.4       perry      65: .Pp
                     66: The traditional display for applications when no device is
                     67: found is the string
                     68: .Dq ?? .
1.7       simonb     69: .Sh FILES
                     70: .Bl -tag -width /var/run/dev.db -compact
                     71: .It Pa /var/run/dev.db
                     72: Device database file.
                     73: .El
1.1       cgd        74: .Sh SEE ALSO
                     75: .Xr stat 2 ,
                     76: .Xr dev_mkdb 8
                     77: .Sh HISTORY
                     78: The
                     79: .Nm devname
                     80: function call appeared in
                     81: .Bx 4.4 .