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Updated: Thursday, June 13, 2019
 
 

fork (3)

Name

fork - basic process management

Synopsis

@load "fork"

pid = fork()

ret = waitpid(pid)

ret = wait();

Description

FORK(3)                    GNU Awk Extension Modules                   FORK(3)



NAME
       fork, wait, waitpid - basic process management

SYNOPSIS
       @load "fork"

       pid = fork()

       ret = waitpid(pid)

       ret = wait();

DESCRIPTION
       The fork extension adds three functions, as follows.

       fork() This  function  creates  a  new process. The return value is the
              zero in the child and the process-id number of the child in  the
              parent,  or  -1  upon error. In the latter case, ERRNO indicates
              the problem.  In the child, PROCINFO["pid"] and PROCINFO["ppid"]
              are updated to reflect the correct values.

       waitpid()
              This  function takes a numeric argument, which is the process-id
              to wait for. The return value is that of the  waitpid(2)  system
              call.

       wait() This  function  waits  for  the  first child to die.  The return
              value is that of the wait(2) system call.

BUGS
       There is no corresponding exec() function.

       The interfaces could be enhanced to provide more facilities,  including
       pulling out the various bits of the return status.

EXAMPLE
       @load "fork"
       ...
       if ((pid = fork()) == 0)
           print "hello from the child"
       else
           print "hello from the parent"


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       +---------------+------------------+
       |ATTRIBUTE TYPE | ATTRIBUTE VALUE  |
       +---------------+------------------+
       |Availability   | text/gawk        |
       +---------------+------------------+
       |Stability      | Volatile         |
       +---------------+------------------+
SEE ALSO
       GAWK:  Effective AWK Programming, filefuncs(3), fnmatch(3), inplace(3),
       ordchr(3), readdir(3), readfile(3), revoutput(3), rwarray(3), time(3).

       fork(2), wait(2), waitpid(2).

AUTHOR
       Arnold Robbins, arnold@skeeve.com.

COPYING PERMISSIONS
       Copyright (C) 2012, 2013, Free Software Foundation, Inc.

       Permission is granted to make and distribute verbatim  copies  of  this
       manual  page  provided  the copyright notice and this permission notice
       are preserved on all copies.

       Permission is granted to copy and distribute modified versions of  this
       manual  page  under  the conditions for verbatim copying, provided that
       the entire resulting derived work is distributed under the terms  of  a
       permission notice identical to this one.

       Permission  is granted to copy and distribute translations of this man-
       ual page into another language, under the above conditions for modified
       versions,  except that this permission notice may be stated in a trans-
       lation approved by the Foundation.



NOTES
       This    software    was    built    from    source     available     at
       https://github.com/oracle/solaris-userland.    The  original  community
       source                was                downloaded                from
       https://ftp.gnu.org/gnu/gawk/gawk-4.2.1.tar.xz

       Further information about this software can be found on the open source
       community website at https://www.gnu.org/software/gawk.



Free Software Foundation          Jan 15 2013                          FORK(3)