Pid(3) User Contributed Perl Documentation Pid(3)NAMELinux::Pid - Get the native PID and the PPID on Linux
SYNOPSIS
use Linux::Pid;
print Linux::Pid::getpid(), "\t", Linux::Pid::getppid(), "\n";
use Linux::Pid qw(getpid getppid);
print getpid(), "\t", getppid(), "\n";
DESCRIPTION
Why should one use a module to get the PID and the PPID of a process
where there are the $$ variable and the "getppid()" builtin ? (Not
mentioning the equivalent "POSIX::getpid()" and "POSIX::getppid()"
functions.)
In fact, this is useful on Linux, with multithreaded programs. Linux' C
library, using the linux thread model, returns different values of the
PID and the PPID from different threads. (Other thread models such as
NPTL don't have the same behaviour). This module forces perl to call
the underlying C functions "getpid()" and "getppid()".
AUTHOR
Copyright (c) 2002-2007 Rafael Garcia-Suarez. All rights reserved. This
program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
perl v5.14.2 2007-06-12 Pid(3)