Bug #79994 [NEW]: pcntl_signal_get_handler() returns SIG_DFL for externally ignored signals
From: weirdan at gmail dot com
Operating system: Linux (Debian/sid)
PHP version: 7.4.9
Package: PCNTL related
Bug Type: Bug
Bug description:pcntl_signal_get_handler() returns SIG_DFL for externally ignored signals
Description:
------------
Originally discovered by John Stevenson here:
https://github.com/composer/xdebug-handler/issues/109#issuecomment-675462698
When signal is set to be ignored by the process that calls php binary,
pcntl_signal_get_handler() run in the context of that binary reports
that same signal as using default handler (SIG_DFL). However it's
clearly doesn't use default handler, as can demonstrated by the script
below. If it was using default handler, you'd be able to abort the
script with Ctrl-C, but you can't.
PS: use Ctrl-\ to stop it.
Test script:
---------------
<?php
var_dump(
"Is default handler is used for sigint?",
pcntl_signal_get_handler(SIGINT) === SIG_DFL
);
while (true) {
echo ".";
sleep(2);
}
// Run it as follows (in bash/zsh):
// $ trap "" SIGINT; php test.php; trap - SIGINT;
Expected result:
----------------
string(38) "Is default handler is used for sigint?"
bool(false)
..................
Actual result:
--------------
string(38) "Is default handler is used for sigint?"
bool(true)
..................
--
Edit bug report at https://bugs.php.net/bug.php?id=79994&edit=1
--
Fix committed: https://bugs.php.net/fix.php?id=79994&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=79994&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=79994&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=79994&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=79994&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=79994&r=support
Expected behavior: https://bugs.php.net/fix.php?id=79994&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=79994&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=79994&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=79994&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=79994&r=phptooold
Daylight Savings: https://bugs.php.net/fix.php?id=79994&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=79994&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=79994&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=79994&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=79994&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=79994&r=mysqlcfg
Thread (6 messages)
- weirdan at gmail dot com