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Re^2: Perl wait vs Unix ksh wait (spawn)

by tye (Sage)
on Oct 31, 2007 at 18:22 UTC ( #648320=note: print w/ replies, xml ) Need Help??

in reply to Re: Perl wait vs Unix ksh wait (spawn)
in thread Perl wait vs Unix ksh wait

Okay, a close approximation to system(1,...) for less fortunate builds of Perl is:

sub spawn { my( $cmd )= @_; die "Usage: spawn($cmdLine) or spawn([$cmd,@args])" if 1 != @_; die "You don't need this; use system(1,...) instead." if $^O =~ /win32/i; # Not an accurate test my $cpid= fork(); die "Can't fork: $!\n"; if ! defined $cpid; return $cpid if $cpid; if( ! ref $cmd ) { exec( $cmd ); } elsif( 1 == @$cmd ) { $cmd= $cmd->[0]; exec( $cmd $cmd ); } else { exec( @$cmd ); } die "exec failed: $!\n"; }

But note that system(1,...) has some non-trivial advantages still; I didn't replicate the "pipe to child process for making 'exec fails' cases" saner.

So you can use spawn($cmd) in place of system(1,$cmd) in the code I provided in the previous node. I didn't write spawn() to handle Win32 because it was a quick hack.

- tye        

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