Re^2: open with pipe

Use close (implicitly or explicitly) with open, not waitpid.

$ perl -E'
   open(my $pipe, "-|", "perl -e'\''sleep 5; exit 3'\''");
   say time;
   close($pipe);
   say time;
   say $?>>8;
'
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Re^3: open with pipe by repellent (Priest) on Aug 01, 2010 at 17:47 UTC
Sure, `close` can wait for `"-\|"`. But why not `waitpid`? `$ perl -E' $pid = open(my $pipe, "-\|", "perl -e'\''sleep 5; exit 3'\''"); say time; waitpid($pid, 0); say time; say $?>>8; ' 1280685258 1280685263 3` [download] waitpid is documented with: Waits for a particular child process to terminate and returns the pid of the deceased process, or `-1` if there is no such child process. The status is returned in `$?` and `${^CHILD_ERROR_NATIVE}`.	[reply] [d/l] [select]
Re^4: open with pipe by ikegami (Patriarch) on Aug 02, 2010 at 03:40 UTC
Calling waitpid twice for the same process doesn't seem right to me.	[reply]