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Bug #26838 signals make STDIN become EOF
Submitted: 2004-01-08 05:50 UTC Modified: 2008-07-11 21:16 UTC
Votes:2
Avg. Score:3.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:0 (0.0%)
Same OS:1 (50.0%)
From: xuefer at 21cn dot com Assigned:
Status: Wont fix Package: Filesystem function related
PHP Version: 4.3.4 OS: linux
Private report: No CVE-ID: None
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From: xuefer at 21cn dot com
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 [2004-01-08 05:50 UTC] xuefer at 21cn dot com 
Description:
------------
code
shell> ./test.php
don't press CTRL+D to end input. but program exists in 3 seconds because feof() return true
uncomment line 7 will works ok, exit only when i press CTRL+D

Reproduce code:
---------------
file ./test.php:

#!/usr/bin/php
<?php
function sig_handler($signo) {
        global $stdin;
        print "Caught SIGALM...\n";
        pcntl_alarm(3);
        // line7 // $stdin = fopen("php://stdin", 'r') or die('1');
}

print "Installing signal handler...\n";
pcntl_signal(SIGALRM, "sig_handler");
print "Generating signal SIGTERM to self...\n";

declare(ticks=1);
pcntl_alarm(3);
$stdin = fopen("php://stdin", 'r') or die('1');
while (!feof($stdin)) {
        echo fgets($stdin);
}

print "Done\n"
?>

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 [2004-01-08 20:35 UTC] iliaa@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

signals can and will interrupt readings from files & 
sockets.
 [2008-07-05 21:41 UTC] dazjorz at dazjorz dot com 
Hi iliaa@php.net,

Could you explain to me why this isn't a PHP bug? I don't observe this behavior in any other language.

Please see the IEEE standard for alarm() at http://www.opengroup.org/onlinepubs/000095399/functions/alarm.html. They don't speak about any behavior that STDOUT should be eof'd.

I consider this a bug in PHP, even if it is documented. (I couldn't find any documentation, though.)

Sjors

$ perl -le '$SIG{ALRM} = sub { print "Alarm called!"; alarm(5); }; alarm(5); print while(<>)'
 [2008-07-11 21:16 UTC] jani@php.net 
We are sorry, but we can not support PHP 4 related problems anymore.
Momentum is gathering for PHP 6, and we think supporting PHP 4 will
lead to a waste of resources which we want to put into getting PHP 6
ready.
 
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