February 2012
Intermediate to advanced
1184 pages
37h 17m
English
Content preview from Programming Perl, 4th Editionsetpgrp
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setpgrp 
setpgrpPID,PGRP
This function sets the current process group
(PGRP) for the specified
PID (use a PID of
0 for the current process). Invoking setpgrp will raise an exception if used on a
machine that doesn’t implement setpgrp(2). Beware:
some systems will ignore the arguments you provide and always do
setpgrp(0, $$). Fortunately, those
are the arguments one usually wants to provide. If the arguments are
omitted, they default to 0,0. The BSD
4.2 version of setpgrp did not accept
any arguments, but in BSD 4.4, it is a synonym for the setpgid function. For better portability (by
some definition), use the setpgid
function in the POSIX module directly. If what you’re really trying to do is
daemonize your script, consider the POSIX::setsid function as well. Note that the
POSIX version of setpgrp does not
accept arguments, so only setpgrp(0,0) is truly portable.
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