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| use utf8; | |
| use strict; | |
| use IO::File; | |
| use IPC::Open2; | |
| my $ifh0 = IO::Handle->new; | |
| my $ifh1 = IO::File->new_tmpfile; | |
| my $ofh0 = IO::Handle->new; | |
| my $pid0 = open2($ifh0, $ofh0, qw(cat -n)); | |
| my $pid1 = open2('>&' . $ifh1->fileno, '<&' . $ifh0->fileno, qw(tac)); | |
| for (my $i = 1; $i < 20; ++$i) { | |
| print $ofh0 ('x' x $i), "\n"; | |
| } | |
| $ofh0->close; | |
| $ifh0->close; | |
| print STDERR "written to process\n"; | |
| waitpid($pid0, 0); | |
| waitpid($pid1, 0); | |
| $ifh1->seek(0, 0); | |
| while (my $line = <$ifh1>) { | |
| printf STDERR "read: %s", $line; | |
| } | |
| exit(0); |
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| % perl pipetest.pl | |
| written to process | |
| read: 19 xxxxxxxxxxxxxxxxxxx | |
| read: 18 xxxxxxxxxxxxxxxxxx | |
| read: 17 xxxxxxxxxxxxxxxxx | |
| read: 16 xxxxxxxxxxxxxxxx | |
| read: 15 xxxxxxxxxxxxxxx | |
| read: 14 xxxxxxxxxxxxxx | |
| read: 13 xxxxxxxxxxxxx | |
| read: 12 xxxxxxxxxxxx | |
| read: 11 xxxxxxxxxxx | |
| read: 10 xxxxxxxxxx | |
| read: 9 xxxxxxxxx | |
| read: 8 xxxxxxxx | |
| read: 7 xxxxxxx | |
| read: 6 xxxxxx | |
| read: 5 xxxxx | |
| read: 4 xxxx | |
| read: 3 xxx | |
| read: 2 xx | |
| read: 1 x |
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