#include "apr.h"
#include "apr_portable.h"
#include "apr_strings.h"
#include "apr_thread_proc.h"
#include "apr_signal.h"
#include "apr_want.h"
#include "ap_config.h"
#include "httpd.h"
#include "mpm_default.h"
#include "http_main.h"
#include "http_log.h"
#include "http_config.h"
#include "http_core.h"
#include "http_connection.h"
#include "scoreboard.h"
#include "ap_mpm.h"
#include "util_mutex.h"
#include "unixd.h"
#include "mpm_common.h"
#include "ap_listen.h"
#include "ap_mmn.h"
#include "apr_poll.h"
#include <stdlib.h>
#include <signal.h>
#include <sys/times.h>

Classes
struct	prefork_retained_data

struct	prefork_child_bucket

Macros
#define	APR_WANT_STDIO

#define	APR_WANT_STRFUNC

#define	DEFAULT_SERVER_LIMIT 256

#define	MAX_SERVER_LIMIT 200000

#define	HARD_THREAD_LIMIT 1

#define	MAX_SPAWN_RATE (32)

#define	MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)

#define	chdir_for_gprof()

#define	SAFE_ACCEPT(stmt) (stmt)

Typedefs
typedef struct prefork_retained_data	prefork_retained_data

typedef struct prefork_child_bucket	prefork_child_bucket

Functions
static void	prefork_note_child_killed (int childnum, pid_t pid, ap_generation_t gen)

static void	prefork_note_child_started (int slot, pid_t pid)

static void	clean_child_exit (int code) __attribute__((noreturn))

static apr_status_t	accept_mutex_on (void)

static apr_status_t	accept_mutex_off (void)

static int	prefork_query (int query_code, int result, apr_status_t rv)

static const char *	prefork_get_name (void)

static void	just_die (int sig)

static void	stop_listening (int sig)

static void	child_main (int child_num_arg, int child_bucket)

static int	make_child (server_rec *s, int slot)

static void	startup_children (int number_to_start)

static void	perform_idle_server_maintenance (apr_pool_t *p)

static int	prefork_run (apr_pool_t _pconf, apr_pool_t plog, server_rec *s)

static int	prefork_open_logs (apr_pool_t p, apr_pool_t plog, apr_pool_t ptemp, server_rec s)

static int	prefork_pre_config (apr_pool_t p, apr_pool_t plog, apr_pool_t *ptemp)

static int	prefork_check_config (apr_pool_t p, apr_pool_t plog, apr_pool_t ptemp, server_rec s)

static void	prefork_hooks (apr_pool_t *p)

static const char *	set_daemons_to_start (cmd_parms cmd, void dummy, const char *arg)

static const char *	set_min_free_servers (cmd_parms cmd, void dummy, const char *arg)

static const char *	set_max_free_servers (cmd_parms cmd, void dummy, const char *arg)

static const char *	set_max_clients (cmd_parms cmd, void dummy, const char *arg)

static const char *	set_server_limit (cmd_parms cmd, void dummy, const char *arg)

Variables
static int	ap_daemons_to_start =0

static int	ap_daemons_min_free =0

static int	ap_daemons_max_free =0

static int	ap_daemons_limit =0

static int	server_limit = 0

static prefork_retained_data *	retained

static prefork_child_bucket *	all_buckets

static prefork_child_bucket *	my_bucket

static int	one_process = 0

static apr_pool_t *	pconf

static apr_pool_t *	pchild

static pid_t	ap_my_pid

static pid_t	parent_pid

static int	my_child_num

static int volatile	die_now = 0

static int	requests_this_child

static int	num_listensocks = 0

static const command_rec	prefork_cmds []

static int *const	aplog_module_index = &( mpm_prefork_module.module_index)

Macro Definition Documentation

◆ APR_WANT_STDIO

#define APR_WANT_STDIO

Definition at line 23 of file prefork.c.

◆ APR_WANT_STRFUNC

#define APR_WANT_STRFUNC

Definition at line 24 of file prefork.c.

◆ chdir_for_gprof

#define chdir_for_gprof ( )

Definition at line 195 of file prefork.c.

◆ DEFAULT_SERVER_LIMIT

#define DEFAULT_SERVER_LIMIT 256

Definition at line 75 of file prefork.c.

◆ HARD_THREAD_LIMIT

#define HARD_THREAD_LIMIT 1

Definition at line 86 of file prefork.c.

◆ MAX_SERVER_LIMIT

#define MAX_SERVER_LIMIT 200000

Definition at line 82 of file prefork.c.

◆ MAX_SPAWN_RATE

#define MAX_SPAWN_RATE (32)

Definition at line 120 of file prefork.c.

◆ MPM_CHILD_PID

#define MPM_CHILD_PID ( i ) (ap_scoreboard_image->parent[i].pid)

Definition at line 134 of file prefork.c.

◆ SAFE_ACCEPT

#define SAFE_ACCEPT ( stmt ) (stmt)

Definition at line 292 of file prefork.c.

Typedef Documentation

◆ prefork_child_bucket

typedef struct prefork_child_bucket prefork_child_bucket

◆ prefork_retained_data

typedef struct prefork_retained_data prefork_retained_data

Function Documentation

◆ accept_mutex_off()

static apr_status_t accept_mutex_off ( void )

static

Definition at line 262 of file prefork.c.

◆ accept_mutex_on()

static apr_status_t accept_mutex_on ( void )

static

Definition at line 243 of file prefork.c.

◆ child_main()

static void child_main	(	int	child_num_arg,
		int	child_bucket
	)

static

< Descriptors passed to apr_pollset_add() * are not copied

< Can read without blocking

Definition at line 394 of file prefork.c.

◆ clean_child_exit()

static void clean_child_exit ( int code )

static

Definition at line 219 of file prefork.c.

◆ just_die()

static void just_die ( int sig )

static

Definition at line 357 of file prefork.c.

◆ make_child()

static int make_child	(	server_rec *	s,
		int	slot
	)

static

Definition at line 692 of file prefork.c.

◆ perform_idle_server_maintenance()

static void perform_idle_server_maintenance ( apr_pool_t * p )

static

Definition at line 798 of file prefork.c.

◆ prefork_check_config()

static int prefork_check_config	(	apr_pool_t *	p,
		apr_pool_t *	plog,
		apr_pool_t *	ptemp,
		server_rec *	s
	)

static

< Module has handled this stage.

Definition at line 1345 of file prefork.c.

◆ prefork_get_name()

static const char * prefork_get_name ( void )

static

Definition at line 348 of file prefork.c.

◆ prefork_hooks()

static void prefork_hooks ( apr_pool_t * p )

static

Definition at line 1458 of file prefork.c.

◆ prefork_note_child_killed()

static void prefork_note_child_killed	(	int	childnum,
		pid_t	pid,
		ap_generation_t	gen
	)

static

Definition at line 198 of file prefork.c.

◆ prefork_note_child_started()

static void prefork_note_child_started	(	int	slot,
		pid_t	pid
	)

static

Definition at line 209 of file prefork.c.

◆ prefork_open_logs()

static int prefork_open_logs	(	apr_pool_t *	p,
		apr_pool_t *	plog,
		apr_pool_t *	ptemp,
		server_rec *	s
	)

static

< Module has handled this stage.

Definition at line 1220 of file prefork.c.

◆ prefork_pre_config()

static int prefork_pre_config	(	apr_pool_t *	p,
		apr_pool_t *	plog,
		apr_pool_t *	ptemp
	)

static

< Do not detach

< Detach

< Module has handled this stage.

Definition at line 1283 of file prefork.c.

◆ prefork_query()

static int prefork_query	(	int	query_code,
		int *	result,
		apr_status_t *	rv
	)

static

< This value specifies that an * MPM is not capable of * threading or forking.

< This value specifies that * an MPM is using a dynamic * number of threads or daemons

< Module has handled this stage.

Definition at line 295 of file prefork.c.

◆ prefork_run()

static int prefork_run	(	apr_pool_t *	_pconf,
		apr_pool_t *	plog,
		server_rec *	s
	)

static

< Module has handled this stage.

< Module has served the response completely * - it's safe to die() with no more output

< Module has handled this stage.

Definition at line 899 of file prefork.c.

◆ set_daemons_to_start()

static const char * set_daemons_to_start	(	cmd_parms *	cmd,
		void *	dummy,
		const char *	arg
	)

static

< Forbidden in <VirtualHost>

< Forbidden in <Limit>

< Forbidden in <Directory>

< Forbidden in <Location>

< Forbidden in <Files> or <If>

< Forbidden in <Proxy>

Definition at line 1477 of file prefork.c.

◆ set_max_clients()

static const char * set_max_clients	(	cmd_parms *	cmd,
		void *	dummy,
		const char *	arg
	)

static

< Forbidden in <VirtualHost>

< Forbidden in <Limit>

< Forbidden in <Directory>

< Forbidden in <Location>

< Forbidden in <Files> or <If>

< Forbidden in <Proxy>

Definition at line 1510 of file prefork.c.

◆ set_max_free_servers()

static const char * set_max_free_servers	(	cmd_parms *	cmd,
		void *	dummy,
		const char *	arg
	)

static

< Forbidden in <VirtualHost>

< Forbidden in <Limit>

< Forbidden in <Directory>

< Forbidden in <Location>

< Forbidden in <Files> or <If>

< Forbidden in <Proxy>

Definition at line 1499 of file prefork.c.

◆ set_min_free_servers()

static const char * set_min_free_servers	(	cmd_parms *	cmd,
		void *	dummy,
		const char *	arg
	)

static

< Forbidden in <VirtualHost>

< Forbidden in <Limit>

< Forbidden in <Directory>

< Forbidden in <Location>

< Forbidden in <Files> or <If>

< Forbidden in <Proxy>

Definition at line 1488 of file prefork.c.

◆ set_server_limit()

static const char * set_server_limit	(	cmd_parms *	cmd,
		void *	dummy,
		const char *	arg
	)

static

< Forbidden in <VirtualHost>

< Forbidden in <Limit>

< Forbidden in <Directory>

< Forbidden in <Location>

< Forbidden in <Files> or <If>

< Forbidden in <Proxy>

Definition at line 1525 of file prefork.c.

◆ startup_children()

static void startup_children ( int number_to_start )

static

Definition at line 783 of file prefork.c.

◆ stop_listening()

static void stop_listening ( int sig )

static

Definition at line 365 of file prefork.c.

Variable Documentation

◆ all_buckets

prefork_child_bucket* all_buckets

static

Definition at line 131 of file prefork.c.

◆ ap_daemons_limit

int ap_daemons_limit =0

static

Definition at line 94 of file prefork.c.

◆ ap_daemons_max_free

int ap_daemons_max_free =0

static

Definition at line 93 of file prefork.c.

◆ ap_daemons_min_free

int ap_daemons_min_free =0

static

Definition at line 92 of file prefork.c.

◆ ap_daemons_to_start

int ap_daemons_to_start =0

static

Definition at line 91 of file prefork.c.

◆ ap_my_pid

pid_t ap_my_pid

static

Definition at line 152 of file prefork.c.

◆ aplog_module_index

int* const aplog_module_index = &( mpm_prefork_module.module_index)

static

Definition at line 1554 of file prefork.c.

◆ die_now

int volatile die_now = 0

static

Definition at line 363 of file prefork.c.

◆ my_bucket

prefork_child_bucket * my_bucket

static

Definition at line 132 of file prefork.c.

◆ my_child_num

int my_child_num

static

Definition at line 154 of file prefork.c.

◆ num_listensocks

int num_listensocks = 0

static

Definition at line 381 of file prefork.c.

◆ one_process

int one_process = 0

static

Definition at line 147 of file prefork.c.

◆ parent_pid

pid_t parent_pid

static

Definition at line 153 of file prefork.c.

◆ pchild

apr_pool_t* pchild

static

Definition at line 150 of file prefork.c.

◆ pconf

apr_pool_t* pconf

static

Definition at line 149 of file prefork.c.

◆ prefork_cmds

const command_rec prefork_cmds[]

static

Initial value:

= {
 {  "ListenBacklog" ,  ap_set_listenbacklog ,  NULL ,   128   , TAKE1,  "Maximum length of the queue of pending connections, as used by listen(2)"  },  {  "ListenCoresBucketsRatio" ,  ap_set_listencbratio ,  NULL ,   128   , TAKE1,  "Ratio between the number of CPU cores (online) and the number of listeners buckets"  },  {  "Listen" ,  ap_set_listener ,  NULL ,   128   , TAKE_ARGV,  "A port number or a numeric IP address and a port number, and an optional protocol"  },  {  "SendBufferSize" ,  ap_set_send_buffer_size ,  NULL ,   128   , TAKE1,  "Send buffer size in bytes"  },  {  "ReceiveBufferSize" ,  ap_set_receive_buffer_size ,  NULL ,   128   , TAKE1,  "Receive buffer size in bytes"  } ,
 
{  "StartServers" ,  set_daemons_to_start ,  NULL ,   128   , TAKE1,  "Number of child processes launched at server startup"  },
 
{  "MinSpareServers" ,  set_min_free_servers ,  NULL ,   128   , TAKE1,  "Minimum number of idle children, to handle request spikes"  },
 
{  "MaxSpareServers" ,  set_max_free_servers ,  NULL ,   128   , TAKE1,  "Maximum number of idle children"  },
 
{  "MaxClients" ,  set_max_clients ,  NULL ,   128   , TAKE1,  "Deprecated name of MaxRequestWorkers"  },
 
{  "MaxRequestWorkers" ,  set_max_clients ,  NULL ,   128   , TAKE1,  "Maximum number of children alive at the same time"  },
 
{  "ServerLimit" ,  set_server_limit ,  NULL ,   128   , TAKE1,  "Maximum value of MaxRequestWorkers for this run of Apache"  },
 {  "GracefulShutdownTimeout" ,  ap_mpm_set_graceful_shutdown ,  NULL ,   128   , TAKE1,  "Maximum time in seconds to wait for child "   "processes to complete transactions during shutdown"  } ,
{ NULL }
}

Definition at line 1536 of file prefork.c.

◆ requests_this_child

int requests_this_child

static

Definition at line 380 of file prefork.c.

◆ retained

prefork_retained_data* retained

static

Definition at line 124 of file prefork.c.

◆ server_limit

int server_limit = 0

static

Definition at line 95 of file prefork.c.

Classes

Macros

Typedefs

Functions

Variables

Macro Definition Documentation

◆ APR_WANT_STDIO

◆ APR_WANT_STRFUNC

◆ chdir_for_gprof

◆ DEFAULT_SERVER_LIMIT

◆ HARD_THREAD_LIMIT

◆ MAX_SERVER_LIMIT

◆ MAX_SPAWN_RATE

◆ MPM_CHILD_PID

◆ SAFE_ACCEPT

Typedef Documentation

◆ prefork_child_bucket

◆ prefork_retained_data

Function Documentation

◆ accept_mutex_off()

◆ accept_mutex_on()

◆ child_main()

◆ clean_child_exit()

◆ just_die()

◆ make_child()

◆ perform_idle_server_maintenance()

◆ prefork_check_config()

◆ prefork_get_name()

◆ prefork_hooks()

◆ prefork_note_child_killed()

◆ prefork_note_child_started()

◆ prefork_open_logs()

◆ prefork_pre_config()

◆ prefork_query()

◆ prefork_run()

◆ set_daemons_to_start()

◆ set_max_clients()

◆ set_max_free_servers()

◆ set_min_free_servers()

◆ set_server_limit()

◆ startup_children()

◆ stop_listening()

Variable Documentation

◆ all_buckets

◆ ap_daemons_limit

◆ ap_daemons_max_free

◆ ap_daemons_min_free

◆ ap_daemons_to_start

◆ ap_my_pid

◆ aplog_module_index

◆ die_now

◆ my_bucket

◆ my_child_num

◆ num_listensocks

◆ one_process

◆ parent_pid

◆ pchild

◆ pconf

◆ prefork_cmds

◆ requests_this_child

◆ retained

◆ server_limit