pcntl_sigwaitinfo
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
pcntl_sigwaitinfo — Waits for signals
Description
$signals, array &$info = []): int|false
The pcntl_sigwaitinfo() function suspends execution of the
calling script until one of the signals given in signals
are delivered. If one of the signal is already pending (e.g. blocked by
pcntl_sigprocmask()),
pcntl_sigwaitinfo() will return immediately.
Parameters
-
signals -
Array of signals to wait for.
-
info -
The
infoparameter is set to an array containing information about the signal.The following elements are set for all signals:
- signo: Signal number
- errno: An error number
- code: Signal code
The following elements may be set for the
SIGCHLDsignal:- status: Exit value or signal
- utime: User time consumed
- stime: System time consumed
- pid: Sending process ID
- uid: Real user ID of sending process
The following elements may be set for the
SIGILL,SIGFPE,SIGSEGVandSIGBUSsignals:- addr: Memory location which caused fault
The following element may be set for the
SIGPOLLsignal:- band: Band event
- fd: File descriptor number
Return Values
Returns a signal number on success, or false on failure.
Examples
Example #1 pcntl_sigwaitinfo() example
<?php
echo "Blocking SIGHUP signal\n";
pcntl_sigprocmask(SIG_BLOCK, array(SIGHUP));
echo "Sending SIGHUP to self\n";
posix_kill(posix_getpid(), SIGHUP);
echo "Waiting for signals\n";
$info = array();
pcntl_sigwaitinfo(array(SIGHUP), $info);
?>
See Also
- pcntl_sigprocmask() - Sets and retrieves blocked signals
- pcntl_sigtimedwait() - Waits for signals, with a timeout
