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Full Discussion: Getting exit status of child in trap handler
Top Forums Shell Programming and Scripting Getting exit status of child in trap handler Post 302206048 by rimon on Tuesday 17th of June 2008 01:05:35 AM
Old 06-17-2008
In the ouput $? is evaluated to 0. I'm not sure at what point its evaluated, but I've tried this with a function as well, something like:

Code:
function err_handler
{
        echo The child exited  with $?
}

trap err_handler CHLD

And I still got 0 as the value of $? .
 

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LEARN ABOUT PHP

pcntl_wait

PCNTL_WAIT(3)								 1							     PCNTL_WAIT(3)

pcntl_wait - Waits on or returns the status of a forked child

SYNOPSIS

       int pcntl_wait (int  &$status, [int  $options])

DESCRIPTION

	The  wait  function  suspends execution of the current process until a child has exited, or until a signal is delivered whose action is to
       terminate the current process or to call a signal handling function. If a child has already exited by the time of  the  call  (a  so-called
       "zombie" process), the function returns immediately. Any system resources used by the child are freed. Please see your system's wait(2) man
       page for specific details as to how wait works on your system.

       Note

	       This function is equivalent to calling pcntl_waitpid(3) with a -1$pid and no $options.

PARAMETERS

	      o $status
		-pcntl_wait(3) will store status information in the $status parameter which  can  be  evaluated  using	the  following	functions:
		pcntl_wifexited(3), pcntl_wifstopped(3), pcntl_wifsignaled(3), pcntl_wexitstatus(3), pcntl_wtermsig(3) and pcntl_wstopsig(3).

	      o $options
		- If wait3 is available on your system (mostly BSD-style systems), you can provide the optional $options parameter. If this param-
		eter 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(3)  returns  the process ID of the child which exited, -1 on error or zero if WNOHANG was provided as an option (on wait3-avail-
       able systems) and no child was available.

SEE ALSO

       pcntl_fork(3), pcntl_signal(3), pcntl_wifexited(3),  pcntl_wifstopped(3),  pcntl_wifsignaled(3),  pcntl_wexitstatus(3),	pcntl_wtermsig(3),
       pcntl_wstopsig(3), pcntl_waitpid(3).

PHP Documentation Group 													     PCNTL_WAIT(3)
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