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Revision 1.12, Sun Jun 3 21:42:46 2012 UTC (4 years, 3 months ago) by joerg
Switch device database to cdb(5). Rework ttyname(3) and ttyname_r(3) to depend on new devname_r(3) as heart. Add /dev/pts magic directly to devname(3). While it can lead to returning non-existing paths, the behavior is more consistent that way. Drop caching layer in devname(3), it doesn't buy anything for the common case of having access to the database. Teach devname(3) proper fallback behavior of scanning /dev. Create both old-style and new-style database for now in /etc/rc.d/sysdb.
.\" $NetBSD: devname.3,v 1.12 2012/06/03 21:42:46 joerg Exp $ .\" .\" Copyright (c) 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)devname.3 8.2 (Berkeley) 4/29/95 .\" .Dd June 3, 2012 .Dt DEVNAME 3 .Os .Sh NAME .Nm devname .Nd get device name .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In stdlib.h .In sys/stat.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, .Dv NULL is returned. .Pp The traditional display for applications when no device is found is the string .Dq ?? . .Sh FILES .Bl -tag -width /var/run/dev.cdb -compact .It Pa /var/run/dev.cdb Device database file. .El .Sh SEE ALSO .Xr stat 2 , .Xr dev_mkdb 8 .Sh HISTORY The .Nm devname function call appeared in .Bx 4.4 .