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-.\" Copyright (c) 1980, 1991, 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. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. 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.
-.\"
-.\"	@(#)fork.2	8.1 (Berkeley) 6/4/93
-.\"
-.Dd June 4, 1993
-.Dt FORK 2
-.Os BSD 4
-.Sh NAME
-.Nm fork
-.Nd create a new process
-.Sh SYNOPSIS
-.Fd #include <unistd.h>
-.Ft pid_t
-.Fn fork void
-.Sh DESCRIPTION
-.Fn Fork
-causes creation of a new process.
-The new process (child process) is an exact copy of the
-calling process (parent process) except for the following:
-.Bl -bullet -offset indent
-.It
-The child process has a unique process ID.
-.It
-The child process has a different parent
-process ID (i.e., the process ID of the parent process).
-.It
-The child process has its own copy of the parent's descriptors.
-These descriptors reference the same underlying objects, so that,
-for instance, file pointers in file objects are shared between
-the child and the parent, so that an
-.Xr lseek 2
-on a descriptor in the child process can affect a subsequent
-.Xr read 2
-or
-.Xr write 2
-by the parent.
-This descriptor copying is also used by the shell to
-establish standard input and output for newly created processes
-as well as to set up pipes.
-.It
-The child processes resource utilizations
-are set to 0; see
-.Xr setrlimit 2 .
-.El
-.Sh RETURN VALUES
-Upon successful completion,
-.Fn fork
-returns a value
-of 0 to the child process and returns the process ID of the child
-process to the parent process.  Otherwise, a value of -1 is returned
-to the parent process, no child process is created, and the global
-variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-.Fn Fork
-will fail and no child process will be created if:
-.Bl -tag -width [EAGAIN]
-.It Bq Er EAGAIN
-The system-imposed limit on the total
-number of processes under execution would be exceeded.
-The limit is given by the
-.Xr sysctl 3
-MIB variable
-.Dv KERN_MAXPROC .
-(The limit is actually one less than this
-except for the super user).
-.It Bq Er EAGAIN
-The user is not the super user, and
-the system-imposed limit
-on the total number of
-processes under execution by a single user would be exceeded.
-The limit is given by the
-.Xr sysctl 3
-MIB variable
-.Dv KERN_MAXPROCPERUID .
-.It Bq Er EAGAIN
-The user is not the super user, and
-the soft resource limit corresponding to the resource parameter
-.Dv RLIMIT_NPROC
-would be exceeded (see
-.Xr getrlimit 2 ) .
-.It Bq Er ENOMEM
-There is insufficient swap space for the new process.
-.El
-.Sh SEE ALSO
-.Xr execve 2 ,
-.Xr rfork 2 ,
-.Xr vfork 2 ,
-.Xr wait 2
-.Sh HISTORY
-A
-.Fn fork 2
-function call appeared in
-.At v6 .