mpm_common.h revision fea3625adece15d099bfec089f056426df1a98fb
/* ====================================================================
* The Apache Software License, Version 1.1
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* reserved.
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*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/* The purpose of this file is to store the code that MOST mpm's will need
* this does not mean a function only goes into this file if every MPM needs
* it. It means that if a function is needed by more than one MPM, and
* future maintenance would be served by making the code common, then the
* function belongs here.
*
* specific to multi-process servers, but NOT to Unix. Which is why it
*/
#ifndef APACHE_MPM_COMMON_H
#define APACHE_MPM_COMMON_H
#include "ap_config.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
/**
* @package Multi-Processing Modules functions
*/
/* The maximum length of the queue of pending connections, as defined
* by listen(2). Under some systems, it should be increased if you
* are experiencing a heavy TCP SYN flood attack.
*
* It defaults to 511 instead of 512 because some systems store it
* as an 8-bit datatype; 512 truncated to 8-bits is 0, while 511 is
* 255 when truncated.
*/
#ifndef DEFAULT_LISTENBACKLOG
#define DEFAULT_LISTENBACKLOG 511
#endif
/**
* Make sure all child processes that have been spawned by the parent process
* have died. This includes process registered as "other_children".
* @warning This is only defined if the MPM defines
* MPM_NEEDS_RECLAIM_CHILD_PROCESS
* @param terminate Either 1 or 0. If 1, send the child processes SIGTERM
* each time through the loop. If 0, give the process time to die
* on its own before signalling it.
* @tip This function requires that some macros are defined by the MPM: <PRE>
* MPM_SYNC_CHILD_TABLE -- sync the scoreboard image between child and parent
* MPM_CHILD_PID -- Get the pid from the specified spot in the scoreboard
* MPM_NOTE_CHILD_KILLED -- Note the child died in the scoreboard
* </PRE>
*/
void ap_reclaim_child_processes(int terminate);
#endif
/**
* Determine if any child process has died. If no child process died, then
* this process sleeps for the amount of time specified by the MPM defined
* macro SCOREBOARD_MAINTENANCE_INTERVAL.
* @param status The return code if a process has died
* @param ret The process id of the process that died
* @param p The pool to allocate out of
*/
/**
* Log why a child died to the error log, if the child died without the
* parent signalling it.
* @param pid The child that has died
* @param status The status returned from ap_wait_or_timeout
*/
/**
* Turn off the nagle algorithm for the specified socket. The nagle algorithm
* says that we should delay sending partial packets in the hopes of getting
* more data. There are bad interactions between persistent connections and
* Nagle's algorithm that have severe performance penalties.
* @param s The socket to disable nagle for.
*/
void ap_sock_disable_nagle(apr_socket_t *s);
#else
#define ap_sock_disable_nagle(s) /* NOOP */
#endif
/**
* Convert a username to a numeric ID
* @param name The name to convert
* @return The user id corresponding to a name
* @deffunc uid_t ap_uname2id(const char *name)
*/
/**
* Convert a group name to a numeric ID
* @param name The name to convert
* @return The group id corresponding to a name
* @deffunc gid_t ap_gname2id(const char *name)
*/
#ifdef __cplusplus
}
#endif
#endif /* !APACHE_MPM_COMMON_H */