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Diffstat (limited to 'rubbos/app/httpd-2.0.64/include/mpm_common.h')
| -rw-r--r-- | rubbos/app/httpd-2.0.64/include/mpm_common.h | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/rubbos/app/httpd-2.0.64/include/mpm_common.h b/rubbos/app/httpd-2.0.64/include/mpm_common.h new file mode 100644 index 00000000..68ead5f7 --- /dev/null +++ b/rubbos/app/httpd-2.0.64/include/mpm_common.h @@ -0,0 +1,298 @@ +/* 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 + */ + +#ifndef APACHE_MPM_COMMON_H +#define APACHE_MPM_COMMON_H + +#include "ap_config.h" + +#if APR_HAVE_NETINET_TCP_H +#include <netinet/tcp.h> /* for TCP_NODELAY */ +#endif + +#include "mpm.h" + +#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 + * AP_MPM_WANT_RECLAIM_CHILD_PROCESSES + * @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_CHILD_PID -- Get the pid from the specified spot in the scoreboard + * MPM_NOTE_CHILD_KILLED -- Note the child died in the scoreboard + * </pre> + * @tip 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(). + */ +#ifdef AP_MPM_WANT_RECLAIM_CHILD_PROCESSES +void ap_reclaim_child_processes(int terminate); +#endif + +/** + * Tell ap_reclaim_child_processes() about an MPM child process which has no + * entry in the scoreboard. + * @warning This is only defined if the MPM defines + * AP_MPM_WANT_RECLAIM_CHILD_PROCESSES + * @param pid The process id of an MPM child process which should be + * reclaimed when ap_reclaim_child_processes() is called. + * @tip 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(). + */ +#ifdef AP_MPM_WANT_RECLAIM_CHILD_PROCESSES +void ap_register_extra_mpm_process(pid_t pid); +#endif + +/** + * Unregister an MPM child process which was previously registered by a + * call to ap_register_extra_mpm_process(). + * @warning This is only defined if the MPM defines + * AP_MPM_WANT_RECLAIM_CHILD_PROCESSES + * @param pid The process id of an MPM child process which no longer needs to + * be reclaimed. + * @return 1 if the process was found and removed, 0 otherwise + */ +#ifdef AP_MPM_WANT_RECLAIM_CHILD_PROCESSES +int ap_unregister_extra_mpm_process(pid_t pid); +#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 + */ +#ifdef AP_MPM_WANT_WAIT_OR_TIMEOUT +void ap_wait_or_timeout(apr_exit_why_e *status, int *exitcode, apr_proc_t *ret, + apr_pool_t *p); +#endif + +/** + * 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 + * @return 0 on success, APEXIT_CHILDFATAL if MPM should terminate + */ +#ifdef AP_MPM_WANT_PROCESS_CHILD_STATUS +int ap_process_child_status(apr_proc_t *pid, apr_exit_why_e why, int status); +#endif + +#if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF) +/** + * 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 + * @deffunc 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 + * @deffunc gid_t ap_gname2id(const char *name) + */ +AP_DECLARE(gid_t) ap_gname2id(const char *name); +#endif + +#define AP_MPM_HARD_LIMITS_FILE APACHE_MPM_DIR "/mpm_default.h" + +#ifdef AP_MPM_USES_POD + +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; + apr_sockaddr_t *sa; +}; + +/** + * 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 + */ +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 + */ +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 p The pool to use when allocating any required structures. + */ +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 p The pool to use when allocating any required structures. + * @param num The number of child processes to kill + */ +AP_DECLARE(void) ap_mpm_pod_killpg(ap_pod_t *pod, int num); +#endif + +/* + * 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 + */ +#ifdef AP_MPM_WANT_SET_MAX_REQUESTS +extern int ap_max_requests_per_child; +const char *ap_mpm_set_max_requests(cmd_parms *cmd, void *dummy, + const char *arg); +#endif + +/** + * The filename used to store the process id. + */ +#ifdef AP_MPM_WANT_SET_PIDFILE +extern const char *ap_pid_fname; +const char *ap_mpm_set_pidfile(cmd_parms *cmd, void *dummy, + const char *arg); +#endif + +/** + * The name of lockfile used when Apache needs to lock the accept() call. + */ +#ifdef AP_MPM_WANT_SET_LOCKFILE +extern const char *ap_lock_fname; +const char *ap_mpm_set_lockfile(cmd_parms *cmd, void *dummy, + const char *arg); +#endif + +/** + * The system mutex implementation to use for the accept mutex. + */ +#ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH +extern apr_lockmech_e ap_accept_lock_mech; +extern const char ap_valid_accept_mutex_string[]; +const char *ap_mpm_set_accept_lock_mech(cmd_parms *cmd, void *dummy, + const char *arg); +#endif + +/* + * Set the scorboard file. + */ +#ifdef AP_MPM_WANT_SET_SCOREBOARD +const char *ap_mpm_set_scoreboard(cmd_parms *cmd, void *dummy, + const char *arg); +#endif + +/* + * The directory that the server changes directory to dump core. + */ +#ifdef AP_MPM_WANT_SET_COREDUMPDIR +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); +#endif + +#ifdef AP_MPM_WANT_SIGNAL_SERVER +int ap_signal_server(int *, apr_pool_t *); +void ap_mpm_rewrite_args(process_rec *); +#endif + +#ifdef AP_MPM_WANT_SET_MAX_MEM_FREE +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); +#endif + +#ifdef AP_MPM_WANT_FATAL_SIGNAL_HANDLER +extern apr_status_t ap_fatal_signal_setup(server_rec *s, apr_pool_t *pconf); +extern apr_status_t ap_fatal_signal_child_setup(server_rec *s); +#endif + +#if AP_ENABLE_EXCEPTION_HOOK +extern const char *ap_mpm_set_exception_hook(cmd_parms *cmd, void *dummy, + const char *arg); +#endif + +#ifdef __cplusplus +} +#endif + +#endif /* !APACHE_MPM_COMMON_H */ |