Add a few more manpages from Chad.

Fold major.9, minor.9, umajor.9, and uminor.9 into a single device_ids.9.

1 files changed, 104 insertions, 0 deletions

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+.\"
+.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. 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(s), this list of conditions and the following disclaimer as
+.\"    the first lines of this file unmodified other than the possible
+.\"    addition of one or more copyright notices.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice(s), this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 9, 2001
+.Dt UCRED 9
+.Os
+.Sh NAME
+.Nm ucred ,
+.Nm crget ,
+.Nm crhold ,
+.Nm crfree ,
+.Nm crcopy ,
+.Nm crdup
+.Nd "functions related to user credentials"
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/ucred.h
+.Ft "struct ucred *"
+.Fn crget void
+.Ft void
+.Fn crhold "struct ucred *cr"
+.Ft void
+.Fn crfree "struct ucred *cr"
+.Ft "struct ucred *"
+.Fn crcopy "struct ucred *cr"
+.Ft "struct ucred *"
+.Fn crdup "struct ucred *cr"
+.Sh DESCRIPTION
+The
+.Nm
+family of functions is used to manage user credential structures
+.Pq Vt "struct ucred"
+within the kernel.
+.Pp
+The
+.Fn crget
+function allocates memory
+for a new structure, sets its reference count to 1, and
+initializes its lock.
+.Pp
+The
+.Fn crhold
+function increases the reference count on the credential.
+.Pp
+The
+.Fn crfree
+function decreases the reference count on the credential.
+If the count drops to 0, the storage for the structure is freed.
+.Pp
+The
+.Fn crcopy
+function calls
+.Fn crdup
+to create a new structure, and copies the old credentials,
+if the reference count is greater than 1;
+otherwise, the original is returned.
+.Pp
+The
+.Fn crdup
+function allocates memory for a new structure,
+copies the contents of the original structure
+into it, references the
+.Va cr_uidinfo
+and
+.Va cr_ruidinfo
+fields, sets the reference count
+to 1, and then returns the new structure.
+.Sh RETURN VALUES
+The functions that return values all return a pointer to a
+.Vt ucred
+structure.
+In the case of
+.Fn crcopy ,
+the return value may be the same structure you passed to it.
+.Sh SEE ALSO
+.Xr uihold 9
+.Sh AUTHORS
+This man page was written by
+.An Chad David Aq davidc@acns.ab.ca .