fork, wait, waitpid - basic process management
pid = fork()
ret = waitpid(pid)
ret = wait();
extension adds three functions, as follows.
- 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
- 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.
- 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()
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
Arnold Robbins, firstname.lastname@example.org
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