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><H1
><A
NAME="function.pcntl-wait"
></A
>pcntl_wait</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN170134"
></A
><P
> (PHP 5)</P
>pcntl_wait -- Waits on or returns the status of a forked child</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN170137"
></A
><H2
>说明</H2
>int <B
CLASS="methodname"
>pcntl_wait</B
> ( int &status [, int options] )<BR
></BR
><P
> 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.
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
This function is equivalent to calling <A
HREF="function.pcntl-waitpid.html"
><B
CLASS="function"
>pcntl_waitpid()</B
></A
>
with a <TT
CLASS="literal"
>-1</TT
> <CODE
CLASS="parameter"
>pid</CODE
> and no
<CODE
CLASS="parameter"
>options</CODE
>.
</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN170155"
></A
><H2
>参数</H2
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>status</CODE
></DT
><DD
><P
> <B
CLASS="function"
>pcntl_wait()</B
> will store status information
in the <CODE
CLASS="parameter"
>status</CODE
> parameter which can be
evaluated using the following functions:
<A
HREF="function.pcntl-wifexited.html"
><B
CLASS="function"
>pcntl_wifexited()</B
></A
>,
<A
HREF="function.pcntl-wifstopped.html"
><B
CLASS="function"
>pcntl_wifstopped()</B
></A
>,
<A
HREF="function.pcntl-wifsignaled.html"
><B
CLASS="function"
>pcntl_wifsignaled()</B
></A
>,
<A
HREF="function.pcntl-wexitstatus.html"
><B
CLASS="function"
>pcntl_wexitstatus()</B
></A
>,
<A
HREF="function.pcntl-wtermsig.html"
><B
CLASS="function"
>pcntl_wtermsig()</B
></A
> and
<A
HREF="function.pcntl-wstopsig.html"
><B
CLASS="function"
>pcntl_wstopsig()</B
></A
>.
</P
></DD
><DT
><CODE
CLASS="parameter"
>options</CODE
></DT
><DD
><P
> If wait3 is available on your system (mostly BSD-style systems), you can
provide the optional <CODE
CLASS="parameter"
>options</CODE
> parameter. If this
parameter is not provided, wait will be used for the system call. If
wait3 is not available, providing a value for <CODE
CLASS="parameter"
>options
</CODE
> will have no effect. The value of <CODE
CLASS="parameter"
>options
</CODE
> is the value of zero or more of the following two constants
<TT
CLASS="literal"
>OR</TT
>'ed together:
<DIV
CLASS="table"
><A
NAME="AEN170181"
></A
><P
><B
>表 1. Possible values for <CODE
CLASS="parameter"
>options</CODE
></B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><TBODY
><TR
><TD
><TT
CLASS="literal"
>WNOHANG</TT
></TD
><TD
> Return immediately if no child has exited.
</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>WUNTRACED</TT
></TD
><TD
> Return for children which are stopped, and whose status has
not been reported.
</TD
></TR
></TBODY
></TABLE
></DIV
>
</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN170194"
></A
><H2
>返回值</H2
><P
> <B
CLASS="function"
>pcntl_wait()</B
> 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.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN170198"
></A
><H2
>参见</H2
><P
> <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.pcntl-fork.html"
><B
CLASS="function"
>pcntl_fork()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.pcntl-signal.html"
><B
CLASS="function"
>pcntl_signal()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.pcntl-wifexited.html"
><B
CLASS="function"
>pcntl_wifexited()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.pcntl-wifstopped.html"
><B
CLASS="function"
>pcntl_wifstopped()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.pcntl-wifsignaled.html"
><B
CLASS="function"
>pcntl_wifsignaled()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.pcntl-wexitstatus.html"
><B
CLASS="function"
>pcntl_wexitstatus()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.pcntl-wtermsig.html"
><B
CLASS="function"
>pcntl_wtermsig()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.pcntl-wstopsig.html"
><B
CLASS="function"
>pcntl_wstopsig()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.pcntl-waitpid.html"
><B
CLASS="function"
>pcntl_waitpid()</B
></A
></TD
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></P
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