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-.TH FORK 3
-.SH NAME
-fork, rfork \- manipulate process resources
-.SH SYNOPSIS
-.B #include <u.h>
-.br
-.B #include <libc.h>
-.PP
-.nf
-.B
-int fork(void)
-.PP
-.B
-int rfork(int flags)
-.fi
-.SH DESCRIPTION
-Forking is the only way new processes are created.
-The
-.I flags
-argument to
-.I rfork
-selects which resources of the
-invoking process (parent) are shared
-by the new process (child) or initialized to
-their default values.
-The resources include
-the file name space,
-the open file descriptor table (which, when shared, permits processes
-to open and close files for other processes),
-the set of environment variables
-(see
-.IR env (3)),
-the note group
-(the set of processes that receive notes written to a member's
-.B notepg
-file;
-see
-.IR proc (3)),
-the set of rendezvous tags
-(see
-.IR rendezvous (3)); 
-and open files.
-.I Flags
-is the logical OR of some subset of
-.TF RFCNAMEG
-.TP
-.B RFPROC
-If set a new process is created; otherwise changes affect the
-current process.
-.TP
-.B RFNOWAIT
-If set, the child process will be dissociated from the parent. Upon
-exit the child will leave no
-.B Waitmsg
-(see
-.IR wait (3))
-for the parent to collect.
-.TP
-.B RFNAMEG
-If set, the new process inherits a copy of the parent's name space;
-otherwise the new process shares the parent's name space.
-Is mutually exclusive with
-.BR RFCNAMEG .
-.TP
-.B RFCNAMEG
-If set, the new process starts with a clean name space. A new
-name space must be built from a mount of an open file descriptor.
-Is mutually exclusive with
-.BR RFNAMEG .
-.TP
-.B RFNOMNT
-If set, subsequent mounts into the new name space and dereferencing
-of pathnames starting with
-.B #
-are disallowed.
-.TP
-.B RFENVG
-If set, the environment variables are copied;
-otherwise the two processes share environment variables.
-Is mutually exclusive with
-.BR RFCENVG .
-.TP
-.B RFCENVG
-If set, the new process starts with an empty environment.
-Is mutually exclusive with
-.BR RFENVG .
-.TP
-.B RFNOTEG
-Each process is a member of a group of processes that all
-receive notes when a note is written to any of their
-.B notepg
-files (see
-.IR proc (3)).
-The group of a new process is by default the same as its parent, but if
-.B RFNOTEG
-is set (regardless of
-.BR RFPROC ),
-the process becomes the first in a new group, isolated from
-previous processes.
-.TP
-.B RFFDG
-If set, the invoker's file descriptor table (see
-.IR intro (3))
-is copied; otherwise the two processes share a
-single table.
-.TP
-.B RFCFDG
-If set, the new process starts with a clean file descriptor table.
-Is mutually exclusive with
-.BR RFFDG .
-.TP
-.B RFREND
-If set, the process will be unable to
-.IR rendezvous (3)
-with any of its ancestors; its children will, however, be able to
-.B rendezvous
-with it.  In effect,
-.B RFREND
-makes the process the first in a group of processes that share a space for
-.B rendezvous
-tags.
-.TP
-.B RFMEM
-If set, the child and the parent will share
-.B data
-and
-.B bss
-segments.
-Otherwise, the child inherits a copy of those segments.
-Other segment types, in particular stack segments, will be unaffected.
-May be set only with
-.BR RFPROC .
-.PD
-.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
-If
-.B 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 ,
-the return value is zero.
-Process ids range from 1 to the maximum integer
-.RB ( int )
-value.
-.I Rfork
-will sleep, if necessary, until required process resources are available.
-.PP
-.I Fork
-is just a call of
-.BR rfork(RFFDG|RFREND|RFPROC) .
-.SH SOURCE
-.B /usr/local/plan9/src/libc/9syscall
-.br
-.B /usr/local/plan9/src/libc/9sys/fork.c
-.SH SEE ALSO
-.IR intro (3),
-.IR proc (3),
-.SH DIAGNOSTICS
-These functions set
-.IR errstr .