pid = fork()
ret = waitpid(pid)
ret = wait();
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.
This function takes a numeric argument, which is the process-id
to wait for. The return value is that of the waitpid(2) system
wait() This function waits for the first child to die. The return
value is that of the wait(2) system call.
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.
if ((pid = fork()) == 0)
print "hello from the child"
print "hello from the parent"
GAWK: Effective AWK Programming, filefuncs(3am), fnmatch(3am),
inplace(3am), ordchr(3am), readdir(3am), readfile(3am), revoutput(3am),
fork(2), wait(2), waitpid(2).
Arnold Robbins, email@example.com.
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
Free Software Foundation Jan 15 2013 FORK(3am)
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