reference/exec/functions/proc-close.xml
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350d95443aeb0ea8751d71f262aac56d3ad48f83
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except that it only works on processes opened by
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<function>proc_open</function>.
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<function>proc_close</function> waits for the process to terminate, and
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returns its exit code. If you have open pipes to that process, you
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should <function>fclose</function> them prior to calling this function in
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returns its exit code. Open pipes to that process are closed
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when this function is called, in
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order to avoid a deadlock - the child process may not be able to exit
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while the pipes are open.
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</para>
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