From:
Operating system: (Arch) Linux
PHP version: 5.3.8
Package: PCNTL related
Bug Type: Bug
Bug description:pcntl_signal() + fgetc() is not allowing me to break with CTRL+C
Description:
------------
Running the following code at the commandline as demonstrated simply does
not
work for me. It gobbles up all presses of ^C and will not quit (^\ ie
CTRL+\
produces SIGQUIT and is useful in this situation):
php -r "declare(ticks = 1); function quit() { print \"X\\n\"; die; }
pcntl_signal(SIGINT, \"quit\"); fgetc(STDIN);"
Running the following, on the other hand, works for me just fine.
php -r "declare(ticks = 1); function quit() { print \"X\\n\"; die; }
pcntl_signal(SIGINT, \"quit\"); while(1) { sleep(1); };"
Pressing ^C shuts the script down nicely.
I see no problems with the first code example. It should work, right?
Here's
what
strace is saying:
My console | strace console
| (....)
| rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1], [], 8) = 0
| rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
| read(0, 0x943e5f4, 8192) = ? ERESTARTSYS (To be
restarted)
| --- SIGINT (Interrupt) @ 0 (0) ---
| sigreturn() = ? (mask now [])
| read(0, 0x943e5f4, 8192) = ? ERESTARTSYS (To be
restarted)
^C ---------------^
| --- SIGINT (Interrupt) @ 0 (0) ---
| sigreturn() = ? (mask now [])
| read(0, 0x943e5f4, 8192) = ? ERESTARTSYS (To be
restarted)
^C ---------------^
| --- SIGINT (Interrupt) @ 0 (0) ---
| sigreturn() = ? (mask now [])
| read(0,
(waiting) ---------^
It gets even more interesting. Setting parameter 3 to pcntl_signal,
restart_signals, to false makes PHP gobble up one ^C *then* quit:
php -r "declare(ticks = 1); function quit() { print \"X\\n\"; die; }
pcntl_signal(SIGINT, \"quit\", 0); fgetc(STDIN);"
Like so:
My console | strace console
| (...)
| rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1], [], 8) = 0
| rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
| rt_sigaction(SIGINT, {0x82d8690, ~[RTMIN RT_1], SA_INTERRUPT},
{SIG_DFL, [], 0}, 8) = 0
| rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1], [], 8) = 0
| rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
| read(0, 0x9e985f8, 8192) = ? ERESTARTSYS (To be
restarted)
^C --------------^
| --- SIGINT (Interrupt) @ 0 (0) ---
| sigreturn() = ? (mask now [])
| read(0, 0x9e985f8, 8192) = ? ERESTARTSYS (To be
restarted)
^C --------------^
| --- SIGINT (Interrupt) @ 0 (0) ---
| sigreturn() = ? (mask now [])
| rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1], [], 8) = 0
! --> | write(1, "X\n", 2) = 2
| rt_sigprocmask(SIG_BLOCK, ~[RTMIN RT_1], ~[KILL STOP RTMIN
RT_1],
8)
= 0
| rt_sigprocmask(SIG_SETMASK, ~[KILL STOP RTMIN RT_1], NULL, 8)
= 0
| close(2) = 0
| close(1) = 0
| (...)
As you can see from my exclamation, *the custom quit function is WORKING*
in the
second example, just not straight away. PHP seems to be having indigestion
with
the restart_syscalls bit...?
I wasn't sure what to put in what boxes since there were multiple scripts
and
backtraces (if you could call them such) so I put them all here. Hope
that's
okay.
i336
--
Edit bug report at https://bugs.php.net/bug.php?id=55614&edit=1
--
Try a snapshot (PHP 5.4):
https://bugs.php.net/fix.php?id=55614&r=trysnapshot54
Try a snapshot (PHP 5.3):
https://bugs.php.net/fix.php?id=55614&r=trysnapshot53
Try a snapshot (trunk):
https://bugs.php.net/fix.php?id=55614&r=trysnapshottrunk
Fixed in SVN:
https://bugs.php.net/fix.php?id=55614&r=fixed
Fixed in SVN and need be documented:
https://bugs.php.net/fix.php?id=55614&r=needdocs
Fixed in release:
https://bugs.php.net/fix.php?id=55614&r=alreadyfixed
Need backtrace:
https://bugs.php.net/fix.php?id=55614&r=needtrace
Need Reproduce Script:
https://bugs.php.net/fix.php?id=55614&r=needscript
Try newer version:
https://bugs.php.net/fix.php?id=55614&r=oldversion
Not developer issue:
https://bugs.php.net/fix.php?id=55614&r=support
Expected behavior:
https://bugs.php.net/fix.php?id=55614&r=notwrong
Not enough info:
https://bugs.php.net/fix.php?id=55614&r=notenoughinfo
Submitted twice:
https://bugs.php.net/fix.php?id=55614&r=submittedtwice
register_globals:
https://bugs.php.net/fix.php?id=55614&r=globals
PHP 4 support discontinued:
https://bugs.php.net/fix.php?id=55614&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=55614&r=dst
IIS Stability:
https://bugs.php.net/fix.php?id=55614&r=isapi
Install GNU Sed:
https://bugs.php.net/fix.php?id=55614&r=gnused
Floating point limitations:
https://bugs.php.net/fix.php?id=55614&r=float
No Zend Extensions:
https://bugs.php.net/fix.php?id=55614&r=nozend
MySQL Configuration Error:
https://bugs.php.net/fix.php?id=55614&r=mysqlcfg
