On Mon, Feb 27, 2012 at 4:25 AM, Michael Felt <[email protected]> wrote:
> The patch impaired me moved the file to ./include and rebuilt.
> Similiar issues:
>
> httpd: Syntax error on line 143 of /etc/httpd/httpd.conf: Cannot load
> /opt/httpd/libexec/mod_mpm_worker.so into server:
> rtld: 0712-001 Symbol ap_fatal_signal_child_setup was referenced
>
> from module /opt/httpd/libexec/mod_mpm_worker.so(), but a runtime definition
> of the symbol was not found.
> rtld: 0712-001 Symbol ap_reopen_scoreboard was referenced
>
> from module /opt/httpd/libexec/mod_mpm_worker.so(), but a runtime definition
> of the symbol was not found.
> rtld: 0712-001 Symbol ap_mpm_set_graceful_shutdown was referenced
>
> from module /opt/httpd/libexec/mod_mpm_worker.so(), but a runtime definition
> of the symbol was not found.

getting much closer AFAICT

please try with the pdated mpm_common.h and scoreboard.h attached

>
> rtld is"runtime linker/loader", for those wondering...
>
>
> On Sun, Feb 26, 2012 at 11:13 PM, Jeff Trawick <[email protected]> wrote:
>>
>> On Sun, Feb 26, 2012 at 5:09 PM, Michael Felt <[email protected]> wrote:
>> > patched manually, building...
>>
>> ouch...  maybe you have GNU patch installed as gpatch from the AIX
>> Toolbox?
>>
>> anyway, in a subsequent e-mail I noticed other missing symbols...
>> that's in the latest patch and, for the patch impaired, updated
>> mpm_common.h, both attached
>>
>>
>> >
>> >
>> > On Sun, Feb 26, 2012 at 10:56 PM, Michael Felt <[email protected]>
>> > wrote:
>> >>
>> >> er, almost working:
>> >> michael@x054:[/data/prj/httpd-2.4.1]patch -p0 -i *.patch
>> >> Processing...  Looks like a unified context diff...
>> >> The text leading up to this was:
>> >> --------------------------
>> >> |Index: include/mpm_common.h
>> >> |===================================================================
>> >> |--- include/mpm_common.h       (revision 1293841)
>> >> |+++ include/mpm_common.h       (working copy)
>> >> --------------------------
>> >> Patching file include/mpm_common.h using Plan A...
>> >> patch: 3016-037 Malformed patch at line 9: -void
>> >> ap_reclaim_child_processes(int terminate,
>> >>
>> >>
>> >>
>> >> On Sun, Feb 26, 2012 at 10:53 PM, Michael Felt <[email protected]>
>> >> wrote:
>> >>>
>> >>> :) patch from AIX 6.1 works, starting build.
>> >>>
>> >>>
>> >>> On Sun, Feb 26, 2012 at 10:52 PM, Michael Felt <[email protected]>
>> >>> wrote:
>> >>>>
>> >>>> re: not exported... They are not in the .o files either (or is that
>> >>>> because they are not exported?)
>> >>>>
>> >>>>
>> >>>> On Sun, Feb 26, 2012 at 10:51 PM, Michael Felt <[email protected]>
>> >>>> wrote:
>> >>>>>
>> >>>>> I am not so smart I fear, and still no svm installed (working on
>> >>>>> building gnudiff, but not done yet...
>> >>>>>
>> >>>>> root@x105:[/data/prj/httpd-2.4.1]patch -i *patch
>> >>>>> Processing...  I cannot find a patch in there anywhere.
>> >>>>>
>> >>>>>
>> >>>>>
>> >>>>> On Sun, Feb 26, 2012 at 10:44 PM, Jeff Trawick <[email protected]>
>> >>>>> wrote:
>> >>>>>>
>> >>>>>> On Sun, Feb 26, 2012 at 3:30 PM, Michael Felt <[email protected]>
>> >>>>>> wrote:
>> >>>>>> > Unfortunately, although it builds fine, it does not start:
>> >>>>>> >
>> >>>>>> > httpd: Syntax error on line 143 of /etc/httpd/httpd.conf: Cannot
>> >>>>>> > load
>> >>>>>> > /opt/httpd/libexec/mod_mpm_worker.so into server: rtld: 0712-001
>> >>>>>> > Symbol
>> >>>>>> > ap_fatal_signal_setup was referenced\n      from module
>> >>>>>> > /opt/httpd/libexec/mod_mpm_worker.so(), but a runtime
>> >>>>>> > definition\n      of
>> >>>>>> > the symbol was not found.\nrtld: 0712-001 Symbol ap_pid_fname was
>> >>>>>> > referenced\n      from module
>> >>>>>> > /opt/httpd/libexec/mod_mpm_worker.so(), but a
>> >>>>>> > runtime definition\n      of the symbol was not found.\nrtld:
>> >>>>>> > 0712-001
>> >>>>>> > Symbol ap_reclaim_child_processes was referenced\n      from
>> >>>>>> > module
>> >>>>>> > /opt/httpd/libexec/mod_mpm_worker.so(), but a runtime
>> >>>>>> > definition\n      of
>> >>>>>> > the symbol was not found.\nrtld: 0712-001 Symbol
>> >>>>>> > ap_relieve_child_processes
>> >>>>>> > was referenced\n      from module
>> >>>>>> > /opt/httpd/libexec/mod_mpm_worker.so(),
>> >>>>>> > but a runtime definition\n      of the symbol was not
>> >>>>>> > found.\nrtld:
>> >>>>>> > 0712-001
>> >>>>>> > Symbol ap_graceful_shutdown_timeout was referenced\n      from
>> >>>>>> > module
>> >>>>>> > /opt/httpd/libexec/mod_mpm_worker.so(), but a runtime
>> >>>>>> > definition\n      of
>> >>>>>> > the symbol was not found.\nrtld: 0712-001 Symbol ap_mpm_safe_kill
>> >>>>>> > was
>> >>>>>> > referenced\n      from module
>> >>>>>> > /opt/httpd/libexec/mod_mpm_worker.so(), but a
>> >>>>>> > runtime definition\n      of the symbol was not found.\nrtld:
>> >>>>>> > 0712-001
>> >>>>>> > Symbol ap_wait_or_timeout was referenced\n      from module
>> >>>>>> > /opt/httpd/libexec/mod_mpm_worker.so(), but a runtime
>> >>>>>> > definition\n      of
>> >>>>>> > the symbol was not found.\n\t0509-021 Additional errors occurred
>> >>>>>> > but
>> >>>>>> > are not
>> >>>>>> > reported.
>> >>>>>> >
>> >>>>>> > I have been able to find a few of these routines in source code,
>> >>>>>> > e,g,
>> >>>>>> > server/mpm_unix.c, but the routines are not included in
>> >>>>>> > server/mpm_worker.o,
>> >>>>>> > hence ....
>> >>>>>> >
>> >>>>>> > Suggestions welcome (other than filing a bug report).
>> >>>>>>
>> >>>>>> I guess the problem is that those MPM APIs are not decorated with
>> >>>>>> AP_DECLARE() so they don't get added to httpd.exp so they don't get
>> >>>>>> exported from httpd on AIX.
>> >>>>>>
>> >>>>>> Can you try the attached patch to mpm_common.h?
>> >>>>>
>> >>>>>
>> >>>>
>> >>>
>> >>
>> >
>>
>>
>>
>> --
>> Born in Roswell... married an alien...
>
>



-- 
Born in Roswell... married an alien...
/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* 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.
 *
 * This is going in src/main because it is not platform specific, it is
 * specific to multi-process servers, but NOT to Unix.  Which is why it
 * does not belong in src/os/unix
 */

/**
 * @file  mpm_common.h
 * @brief Multi-Processing Modules functions
 *
 * @defgroup APACHE_MPM Multi-Processing Modules
 * @ingroup  APACHE
 * @{
 */

#ifndef APACHE_MPM_COMMON_H
#define APACHE_MPM_COMMON_H

#include "ap_config.h"
#include "ap_mpm.h"
#include "scoreboard.h"

#if APR_HAVE_NETINET_TCP_H
#include <netinet/tcp.h>    /* for TCP_NODELAY */
#endif

#include "apr_proc_mutex.h"

#ifdef __cplusplus
extern "C" {
#endif

/* 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

/* Signal used to gracefully restart */
#define AP_SIG_GRACEFUL SIGUSR1

/* Signal used to gracefully restart (without SIG prefix) */
#define AP_SIG_GRACEFUL_SHORT USR1

/* Signal used to gracefully restart (as a quoted string) */
#define AP_SIG_GRACEFUL_STRING "SIGUSR1"

/* Signal used to gracefully stop */
#define AP_SIG_GRACEFUL_STOP SIGWINCH

/* Signal used to gracefully stop (without SIG prefix) */
#define AP_SIG_GRACEFUL_STOP_SHORT WINCH

/* Signal used to gracefully stop (as a quoted string) */
#define AP_SIG_GRACEFUL_STOP_STRING "SIGWINCH"

/**
 * Callback function used for ap_reclaim_child_processes() and
 * ap_relieve_child_processes().  The callback function will be
 * called for each terminated child process.
 */
typedef void ap_reclaim_callback_fn_t(int childnum, pid_t pid,
                                      ap_generation_t gen);

/**
 * Make sure all child processes that have been spawned by the parent process
 * have died.  This includes process registered as "other_children".
 *
 * @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.
 * @param mpm_callback Callback invoked for each dead child process
 *
 * @note The MPM child processes which are reclaimed are those listed
 * in the scoreboard as well as those currently registered via
 * ap_register_extra_mpm_process().
 */
AP_DECLARE(void) ap_reclaim_child_processes(int terminate,
                                            ap_reclaim_callback_fn_t *mpm_callback);

/**
 * Catch any child processes that have been spawned by the parent process
 * which have exited. This includes processes registered as "other_children".
 *
 * @param mpm_callback Callback invoked for each dead child process

 * @note The MPM child processes which are relieved are those listed
 * in the scoreboard as well as those currently registered via
 * ap_register_extra_mpm_process().
 */
AP_DECLARE(void) ap_relieve_child_processes(ap_reclaim_callback_fn_t *mpm_callback);

/**
 * Tell ap_reclaim_child_processes() and ap_relieve_child_processes() about
 * an MPM child process which has no entry in the scoreboard.
 * @param pid The process id of an MPM child process which should be
 * reclaimed when ap_reclaim_child_processes() is called.
 * @param gen The generation of this MPM child process.
 *
 * @note If an extra MPM child process terminates prior to calling
 * ap_reclaim_child_processes(), remove it from the list of such processes
 * by calling ap_unregister_extra_mpm_process().
 */
AP_DECLARE(void) ap_register_extra_mpm_process(pid_t pid, ap_generation_t gen);

/**
 * Unregister an MPM child process which was previously registered by a
 * call to ap_register_extra_mpm_process().
 * @param pid The process id of an MPM child process which no longer needs to
 * be reclaimed.
 * @param old_gen Set to the server generation of the process, if found.
 * @return 1 if the process was found and removed, 0 otherwise
 */
AP_DECLARE(int) ap_unregister_extra_mpm_process(pid_t pid, ap_generation_t *old_gen);

/**
 * Pool cleanup for end-generation hook implementation
 */
apr_status_t ap_mpm_end_gen_helper(void *unused);

/**
 * Safely signal an MPM child process, if the process is in the
 * current process group.  Otherwise fail.
 * @param pid the process id of a child process to signal
 * @param sig the signal number to send
 * @return APR_SUCCESS if signal is sent, otherwise an error as per kill(3);
 * APR_EINVAL is returned if passed either an invalid (< 1) pid, or if
 * the pid is not in the current process group
 */
AP_DECLARE(apr_status_t) ap_mpm_safe_kill(pid_t pid, int sig);

/**
 * Run the monitor hook (once every ten calls), determine if any child
 * process has died and, if none died, sleep one second.
 * @param status The return code if a process has died
 * @param exitcode The returned exit status of the child, if a child process
 *                 dies, or the signal that caused the child to die.
 * @param ret The process id of the process that died
 * @param p The pool to allocate out of
 * @param s The server_rec to pass
 */
AP_DECLARE(void) ap_wait_or_timeout(apr_exit_why_e *status, int *exitcode,
                                    apr_proc_t *ret, apr_pool_t *p, 
                                    server_rec *s);

/**
 * 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 why The return code of the child process
 * @param status The status returned from ap_wait_or_timeout
 * @return 0 on success, APEXIT_CHILDFATAL if MPM should terminate
 */
AP_DECLARE(int) ap_process_child_status(apr_proc_t *pid, apr_exit_why_e why, int status);

#if defined(TCP_NODELAY)
/**
 * 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

#ifdef HAVE_GETPWNAM
/**
 * Convert a username to a numeric ID
 * @param name The name to convert
 * @return The user id corresponding to a name
 * @fn uid_t ap_uname2id(const char *name)
 */
AP_DECLARE(uid_t) ap_uname2id(const char *name);
#endif

#ifdef HAVE_GETGRNAM
/**
 * Convert a group name to a numeric ID
 * @param name The name to convert
 * @return The group id corresponding to a name
 * @fn gid_t ap_gname2id(const char *name)
 */
AP_DECLARE(gid_t) ap_gname2id(const char *name);
#endif

#ifndef HAVE_INITGROUPS
/**
 * The initgroups() function initializes the group access list by reading the
 * group database /etc/group and using all groups of which user is a member.
 * The additional group basegid is also added to the list.
 * @param name The user name - must be non-NULL
 * @param basegid The basegid to add
 * @return returns 0 on success
 * @fn int initgroups(const char *name, gid_t basegid)
 */
int initgroups(const char *name, gid_t basegid);
#endif

#if !defined(WIN32) || defined(DOXYGEN)

typedef struct ap_pod_t ap_pod_t;

struct ap_pod_t {
    apr_file_t *pod_in;
    apr_file_t *pod_out;
    apr_pool_t *p;
};

/**
 * Open the pipe-of-death.  The pipe of death is used to tell all child
 * processes that it is time to die gracefully.
 * @param p The pool to use for allocating the pipe
 * @param pod the pipe-of-death that is created.
 */
AP_DECLARE(apr_status_t) ap_mpm_pod_open(apr_pool_t *p, ap_pod_t **pod);

/**
 * Check the pipe to determine if the process has been signalled to die.
 */
AP_DECLARE(apr_status_t) ap_mpm_pod_check(ap_pod_t *pod);

/**
 * Close the pipe-of-death
 *
 * @param pod the pipe-of-death to close.
 */
AP_DECLARE(apr_status_t) ap_mpm_pod_close(ap_pod_t *pod);

/**
 * Write data to the pipe-of-death, signalling that one child process
 * should die.
 * @param pod the pipe-of-death to write to.
 */
AP_DECLARE(apr_status_t) ap_mpm_pod_signal(ap_pod_t *pod);

/**
 * Write data to the pipe-of-death, signalling that all child process
 * should die.
 * @param pod The pipe-of-death to write to.
 * @param num The number of child processes to kill
 */
AP_DECLARE(void) ap_mpm_pod_killpg(ap_pod_t *pod, int num);

#endif /* !WIN32 || DOXYGEN */

/**
 * Check that exactly one MPM is loaded
 * Returns NULL if yes, error string if not.
 */
AP_DECLARE(const char *) ap_check_mpm(void);

/*
 * These data members are common to all mpms. Each new mpm
 * should either use the appropriate ap_mpm_set_* function
 * in their command table or create their own for custom or
 * OS specific needs. These should work for most.
 */

/**
 * The maximum number of requests each child thread or
 * process handles before dying off
 */
extern int ap_max_requests_per_child;
const char *ap_mpm_set_max_requests(cmd_parms *cmd, void *dummy,
                                    const char *arg);

/**
 * The filename used to store the process id.
 */
AP_DECLARE_DATA extern const char *ap_pid_fname;
const char *ap_mpm_set_pidfile(cmd_parms *cmd, void *dummy,
                               const char *arg);
void ap_mpm_dump_pidfile(apr_pool_t *p, apr_file_t *out);

/*
 * The directory that the server changes directory to dump core.
 */
extern char ap_coredump_dir[MAX_STRING_LEN];
extern int ap_coredumpdir_configured;
const char *ap_mpm_set_coredumpdir(cmd_parms *cmd, void *dummy,
                                   const char *arg);

/**
 * Set the timeout period for a graceful shutdown.
 */
AP_DECLARE_DATA extern int ap_graceful_shutdown_timeout;
AP_DECLARE(const char *)ap_mpm_set_graceful_shutdown(cmd_parms *cmd, void *dummy,
                                         const char *arg);
#define AP_GRACEFUL_SHUTDOWN_TIMEOUT_COMMAND \
AP_INIT_TAKE1("GracefulShutdownTimeout", ap_mpm_set_graceful_shutdown, NULL, \
              RSRC_CONF, "Maximum time in seconds to wait for child "        \
              "processes to complete transactions during shutdown")


int ap_signal_server(int *, apr_pool_t *);
void ap_mpm_rewrite_args(process_rec *);

AP_DECLARE_DATA extern apr_uint32_t ap_max_mem_free;
extern const char *ap_mpm_set_max_mem_free(cmd_parms *cmd, void *dummy,
                                           const char *arg);

extern apr_size_t ap_thread_stacksize;
extern const char *ap_mpm_set_thread_stacksize(cmd_parms *cmd, void *dummy,
                                               const char *arg);

AP_DECLARE(apr_status_t) ap_fatal_signal_setup(server_rec *s, apr_pool_t *pconf);
AP_DECLARE(apr_status_t) ap_fatal_signal_child_setup(server_rec *s);

/* core's implementation of child_status hook */
extern void ap_core_child_status(server_rec *s, pid_t pid, ap_generation_t gen,
                                 int slot, mpm_child_status status);

#if AP_ENABLE_EXCEPTION_HOOK
extern const char *ap_mpm_set_exception_hook(cmd_parms *cmd, void *dummy,
                                             const char *arg);
#endif

AP_DECLARE_HOOK(int,monitor,(apr_pool_t *p, server_rec *s))

/* register modules that undertake to manage system security */
AP_DECLARE(int) ap_sys_privileges_handlers(int inc);
AP_DECLARE_HOOK(int, drop_privileges, (apr_pool_t * pchild, server_rec * s))

/* implement the ap_mpm_query() function
 * The MPM should return OK+APR_ENOTIMPL for any unimplemented query codes;
 * modules which intercede for specific query codes should DECLINE for others.
 */
AP_DECLARE_HOOK(int, mpm_query, (int query_code, int *result, apr_status_t *rv))

/* register the specified callback */
AP_DECLARE_HOOK(apr_status_t, mpm_register_timed_callback,
                (apr_time_t t, ap_mpm_callback_fn_t *cbfn, void *baton))

/* get MPM name (e.g., "prefork" or "event") */
AP_DECLARE_HOOK(const char *,mpm_get_name,(void))

/* mutex type string for accept mutex, if any; MPMs should use the
 * same mutex type for ease of configuration
 */
#define AP_ACCEPT_MUTEX_TYPE "mpm-accept"

/* internal pre-config logic for MPM-related settings, callable only from
 * core's pre-config hook
 */
void mpm_common_pre_config(apr_pool_t *pconf);

#ifdef __cplusplus
}
#endif

#endif /* !APACHE_MPM_COMMON_H */
/** @} */
/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @file  scoreboard.h
 * @brief Apache scoreboard library
 */

#ifndef APACHE_SCOREBOARD_H
#define APACHE_SCOREBOARD_H

#ifdef __cplusplus
extern "C" {
#endif

#ifdef HAVE_SYS_TIMES_H
#include <sys/time.h>
#include <sys/times.h>
#endif

#include "ap_config.h"
#include "http_config.h"
#include "apr_thread_proc.h"
#include "apr_portable.h"
#include "apr_shm.h"
#include "apr_optional.h"

/* Scoreboard file, if there is one */
#ifndef DEFAULT_SCOREBOARD
#define DEFAULT_SCOREBOARD "logs/apache_runtime_status"
#endif

/* Scoreboard info on a process is, for now, kept very brief ---
 * just status value and pid (the latter so that the caretaker process
 * can properly update the scoreboard when a process dies).  We may want
 * to eventually add a separate set of long_score structures which would
 * give, for each process, the number of requests serviced, and info on
 * the current, or most recent, request.
 *
 * Status values:
 */

#define SERVER_DEAD 0
#define SERVER_STARTING 1       /* Server Starting up */
#define SERVER_READY 2          /* Waiting for connection (or accept() lock) */
#define SERVER_BUSY_READ 3      /* Reading a client request */
#define SERVER_BUSY_WRITE 4     /* Processing a client request */
#define SERVER_BUSY_KEEPALIVE 5 /* Waiting for more requests via keepalive */
#define SERVER_BUSY_LOG 6       /* Logging the request */
#define SERVER_BUSY_DNS 7       /* Looking up a hostname */
#define SERVER_CLOSING 8        /* Closing the connection */
#define SERVER_GRACEFUL 9       /* server is gracefully finishing request */
#define SERVER_IDLE_KILL 10     /* Server is cleaning up idle children. */
#define SERVER_NUM_STATUS 11    /* number of status settings */

/* Type used for generation indicies.  Startup and every restart cause a
 * new generation of children to be spawned.  Children within the same
 * generation share the same configuration information -- pointers to stuff
 * created at config time in the parent are valid across children.  However,
 * this can't work effectively with non-forked architectures.  So while the
 * arrays in the scoreboard never change between the parent and forked
 * children, so they do not require shm storage, the contents of the shm
 * may contain no pointers.
 */
typedef int ap_generation_t;

/* Is the scoreboard shared between processes or not?
 * Set by the MPM when the scoreboard is created.
 */
typedef enum {
    SB_NOT_SHARED = 1,
    SB_SHARED = 2
} ap_scoreboard_e;

/* stuff which is worker specific */
typedef struct worker_score worker_score;
struct worker_score {
#if APR_HAS_THREADS
    apr_os_thread_t tid;
#endif
    int thread_num;
    /* With some MPMs (e.g., worker), a worker_score can represent
     * a thread in a terminating process which is no longer
     * represented by the corresponding process_score.  These MPMs
     * should set pid and generation fields in the worker_score.
     */
    pid_t pid;
    ap_generation_t generation;
    unsigned char status;
    unsigned short conn_count;
    apr_off_t     conn_bytes;
    unsigned long access_count;
    apr_off_t     bytes_served;
    unsigned long my_access_count;
    apr_off_t     my_bytes_served;
    apr_time_t start_time;
    apr_time_t stop_time;
    apr_time_t last_used;
#ifdef HAVE_TIMES
    struct tms times;
#endif
    char client[32];            /* Keep 'em small... */
    char request[64];           /* We just want an idea... */
    char vhost[32];             /* What virtual host is being accessed? */
};

typedef struct {
    int             server_limit;
    int             thread_limit;
    ap_generation_t running_generation; /* the generation of children which
                                         * should still be serving requests.
                                         */
    apr_time_t restart_time;
} global_score;

/* stuff which the parent generally writes and the children rarely read */
typedef struct process_score process_score;
struct process_score {
    pid_t pid;
    ap_generation_t generation; /* generation of this child */
    char quiescing;         /* the process whose pid is stored above is
                             * going down gracefully
                             */
    char not_accepting;     /* the process is busy and is not accepting more
                             * connections (for async MPMs)
                             */
    apr_uint32_t connections;       /* total connections (for async MPMs) */
    apr_uint32_t write_completion;  /* async connections doing write completion */
    apr_uint32_t lingering_close;   /* async connections in lingering close */
    apr_uint32_t keep_alive;        /* async connections in keep alive */
    apr_uint32_t suspended;         /* connections suspended by some module */
};

/* Scoreboard is now in 'local' memory, since it isn't updated once created,
 * even in forked architectures.  Child created-processes (non-fork) will
 * set up these indicies into the (possibly relocated) shmem records.
 */
typedef struct {
    global_score *global;
    process_score *parent;
    worker_score **servers;
} scoreboard;

typedef struct ap_sb_handle_t ap_sb_handle_t;

AP_DECLARE(int) ap_exists_scoreboard_image(void);
AP_DECLARE(void) ap_increment_counts(ap_sb_handle_t *sbh, request_rec *r);

int ap_create_scoreboard(apr_pool_t *p, ap_scoreboard_e t);
AP_DECLARE(apr_status_t) ap_reopen_scoreboard(apr_pool_t *p, apr_shm_t **shm, int detached);
void ap_init_scoreboard(void *shared_score);
AP_DECLARE(int) ap_calc_scoreboard_size(void);
apr_status_t ap_cleanup_scoreboard(void *d);

AP_DECLARE(void) ap_create_sb_handle(ap_sb_handle_t **new_sbh, apr_pool_t *p,
                                     int child_num, int thread_num);

AP_DECLARE(int) ap_find_child_by_pid(apr_proc_t *pid);
AP_DECLARE(int) ap_update_child_status(ap_sb_handle_t *sbh, int status, request_rec *r);
AP_DECLARE(int) ap_update_child_status_from_indexes(int child_num, int thread_num,
                                                    int status, request_rec *r);
AP_DECLARE(int) ap_update_child_status_from_conn(ap_sb_handle_t *sbh, int status, conn_rec *c);
AP_DECLARE(void) ap_time_process_request(ap_sb_handle_t *sbh, int status);

AP_DECLARE(worker_score *) ap_get_scoreboard_worker(ap_sb_handle_t *sbh);
AP_DECLARE(worker_score *) ap_get_scoreboard_worker_from_indexes(int child_num,
                                                                int thread_num);
AP_DECLARE(process_score *) ap_get_scoreboard_process(int x);
AP_DECLARE(global_score *) ap_get_scoreboard_global(void);

AP_DECLARE_DATA extern scoreboard *ap_scoreboard_image;
AP_DECLARE_DATA extern const char *ap_scoreboard_fname;
AP_DECLARE_DATA extern int ap_extended_status;
AP_DECLARE_DATA extern int ap_mod_status_reqtail;

/*
 * Command handlers [internal]
 */
const char *ap_set_scoreboard(cmd_parms *cmd, void *dummy, const char *arg);
const char *ap_set_extended_status(cmd_parms *cmd, void *dummy, int arg);
const char *ap_set_reqtail(cmd_parms *cmd, void *dummy, int arg);

/* Hooks */
/**
  * Hook for post scoreboard creation, pre mpm.
  * @param p       Apache pool to allocate from.
  * @param sb_type
  * @ingroup hooks
  * @return OK or DECLINE on success; anything else is a error
  */
AP_DECLARE_HOOK(int, pre_mpm, (apr_pool_t *p, ap_scoreboard_e sb_type))

/* for time_process_request() in http_main.c */
#define START_PREQUEST 1
#define STOP_PREQUEST  2

#ifdef __cplusplus
}
#endif

#endif  /* !APACHE_SCOREBOARD_H */

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