pcntl_wait
(PHP 5)
pcntl_wait — Waits on or returns the status of a forked child
Description
int pcntl_wait
( int &$status
[, int $options
] )
Note:
This function is equivalent to calling pcntl_waitpid()
with a -1 pid
and no
options
.
Parameters
-
status
-
pcntl_wait() will store status information
in the status
parameter which can be
evaluated using the following functions:
pcntl_wifexited(),
pcntl_wifstopped(),
pcntl_wifsignaled(),
pcntl_wexitstatus(),
pcntl_wtermsig() and
pcntl_wstopsig().
-
options
-
If wait3 is available on your system (mostly BSD-style systems), you can
provide the optional options
parameter. If this
parameter is not provided, wait will be used for the system call. If
wait3 is not available, providing a value for options
will have no effect. The value of options
is the value of zero or more of the following two constants
OR'ed together:
Possible values for options
| WNOHANG |
Return immediately if no child has exited.
|
| WUNTRACED |
Return for children which are stopped, and whose status has
not been reported.
|
Return Values
pcntl_wait() returns the process ID of the
child which exited, -1 on error or zero if WNOHANG was provided as an
option (on wait3-available systems) and no child was available.
pcntl_signal
