From f80de0f6ef039627a748c8d8ab8bd89a8cd6d4a8 Mon Sep 17 00:00:00 2001
From: niklas <niklas@openbsd.org>
Date: Sun, 14 Jan 1996 01:27:17 +0000
Subject: [PATCH] Redid formatting with mandoc macros.  Added an "ERRORS"
 section.

---
 lib/libc/sys/rfork.2 | 120 ++++++++++++++++++++++++-------------------
 1 file changed, 66 insertions(+), 54 deletions(-)

diff --git a/lib/libc/sys/rfork.2 b/lib/libc/sys/rfork.2
index 0e4ad63486a..63ef078dd8e 100644
--- a/lib/libc/sys/rfork.2
+++ b/lib/libc/sys/rfork.2
@@ -3,24 +3,23 @@
 .\" describe the actual OpenBSD implimentation. Permission for
 .\" use of this page comes from Rob Pike <rob@plan9.att.com>.
 .\"
-.TH RFORK 2
-.SH NAME
-rfork \- manipulate process resources
-.SH SYNOPSIS
-.B #include <sys/param.h>
-.br
-.B #include <unistd.h>
-.PP
-.nf
-.B
-int rfork(int flags)
-.fi
-.SH DESCRIPTION
-Forking or rforking is the only way new processes are created.
+.Dd Jan 12, 1996
+.Dt RFORK 2
+.Os
+.Sh NAME
+.Nm rfork
+.Nd manipulate process resources
+.Sh SYNOPSIS
+.Fd #include <sys/param.h>
+.Fd #include <unistd.h>
+.Ft int
+.Fn rfork "int flags"
+.Sh DESCRIPTION
+Forking, vforking or rforking is the only way new processes are created.
 The
-.I flags
+.Fa flags
 argument to
-.I rfork
+.Fn rfork
 selects which resources of the
 invoking process (parent) are shared
 by the new process (child) or initialized to
@@ -29,73 +28,86 @@ The resources include
 the open file descriptor table (which, when shared, permits processes
 to open and close files for other processes),
 and open files.
-.I Flags
+.Fa Flags
 is the logical OR of some subset of
-.TF RFCNAMEG
-.TP
-.B RFPROC
+.Bl -tag -width "RFCNAMEG" -compact -offset indent
+.It RFPROC
 If set a new process is created; otherwise changes affect the
 current process.
 The current implementation requires this flag to always be set.
-.TP
-.B RFNOWAIT
+.It RFNOWAIT
 If set, the child process will be dissociated from the parent. Upon
-exit the child will leave no
-.B Waitmsg
-(see
-.IR wait (2))
-for the parent to collect.
+exit the child will not leave a status for the parent to collect.
+See 
+.Xr wait 2 .
 This is not currently implemented.
-.TP
-.B RFNAMEG, RFCNAMEG, RFENVG, RFCENVG, RFNOTEG
+.It RFNAMEG, RFCNAMEG, RFENVG, RFCENVG, RFNOTEG
 These are Plan 9 specific flags, and not implimented.
-.TP
-.B RFFDG
+.It RFFDG
 If set, the invoker's file descriptor table (see
-.IR intro (2))
-is copied; otherwise the two processes share a
+.Xr intro 2
+) is copied; otherwise the two processes share a
 single table.
-.TP
-.B RFCFDG
+.It RFCFDG
 If set, the new process starts with a clean file descriptor table.
 Is mutually exclusive with
-.BR RFFDG .
-.TP
-.B RFMEM
+.Dv RFFDG .
+.It RFMEM
 If set, the kernel will force sharing of the entire address space.
 The child
 will then inherit all the shared segments the parent process owns. Other segment
 types will be unaffected.  Subsequent forks by the parent will then
 propagate the shared data and bss between children.  The stack segment
 is always split.  May be set only with
-.BR RFPROC .
-.PD
-.PP
+.Dv RFPROC .
+.El
+.Pp
 File descriptors in a shared file descriptor table are kept
 open until either they are explicitly closed
 or all processes sharing the table exit.
-.PP
+.Pp
 If
-.B RFPROC
+.Dv RFPROC
 is set, the
 value returned in the parent process
 is the process id
 of the child process; the value returned in the child is zero.
 Without
-.BR RFPROC ,
+.Dv RFPROC ,
 the return value is zero.
 Process ids range from 1 to the maximum integer
-.RB ( int )
+.Ft ( int )
 value.
-.I Rfork
+.Fn Rfork
 will sleep, if necessary, until required process resources are available.
-.PP
-.I Fork
+.Pp
+.Fn Fork
 can be implemented as a call to
-.BR rfork(RFFDG|RFPROC)
+.Xr rfork "RFFDG|RFPROC"
 but isn't for backwards compatibility.
-.SH SEE ALSO
-.IR intro (2),
-.IR fork (2),
-.IR minherit (2).
-
+.Sh ERRORS
+.Fn Rfork
+will fail and no child process will be created if:
+.Bl -tag -width Er
+.It Bq Er EAGAIN
+The system-imposed limit on the total
+number of processes under execution would be exceeded.
+This limit is configuration-dependent.
+.It Bq Er EAGAIN
+The system-imposed limit
+.Dv MAXUPRC
+.Pq Aq Pa sys/param.h
+on the total number of
+processes under execution by a single user would be exceeded.
+.It Bq Er ENOMEM
+There is insufficient swap space for the new process.
+.El
+.Sh SEE ALSO
+.Xr intro 2 ,
+.Xr fork 2 ,
+.Xr vfork 2 ,
+.Xr minherit 2
+.Sh HISTORY
+The
+.Fn rfork
+function first appeared in Plan9.
-- 
2.20.1