Mercurial > hg > nginx
diff src/os/unix/ngx_process_cycle.c @ 278:0ba4821f4460
nginx-0.0.2-2004-03-04-10:04:55 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 04 Mar 2004 07:04:55 +0000 |
parents | |
children | b79f021a644a |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os/unix/ngx_process_cycle.c Thu Mar 04 07:04:55 2004 +0000 @@ -0,0 +1,517 @@ + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_event.h> + + +static void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx); +static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data); +#if (NGX_THREADS) +static int ngx_worker_thread_cycle(void *data); +#endif + + +ngx_int_t ngx_process; +ngx_pid_t ngx_pid; +ngx_pid_t ngx_new_binary; +ngx_int_t ngx_inherited; + +sig_atomic_t ngx_reap; +sig_atomic_t ngx_timer; +sig_atomic_t ngx_terminate; +sig_atomic_t ngx_quit; +sig_atomic_t ngx_noaccept; +sig_atomic_t ngx_reconfigure; +sig_atomic_t ngx_reopen; +sig_atomic_t ngx_change_binary; + + +/* TODO: broken NGX_PROCESS_SINGLE */ + +void ngx_master_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx) +{ + int signo; + sigset_t set; + struct timeval tv; + struct itimerval itv; + ngx_uint_t i, live; + ngx_msec_t delay; + ngx_core_conf_t *ccf; + + sigemptyset(&set); + sigaddset(&set, SIGCHLD); + sigaddset(&set, SIGALRM); + sigaddset(&set, SIGINT); + sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL)); + sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL)); + sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL)); + sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL)); + sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL)); + sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL)); + + if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "sigprocmask() failed"); + } + + sigemptyset(&set); + + ngx_setproctitle("master process"); + + ngx_new_binary = 0; + delay = 0; + signo = 0; + live = 0; + + for ( ;; ) { + ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "new cycle"); + + if (ngx_process == NGX_PROCESS_MASTER) { + ngx_spawn_process(cycle, ngx_worker_process_cycle, NULL, + "worker process", NGX_PROCESS_RESPAWN); + + /* + * we have to limit the maximum life time of the worker processes + * by 1 month because our millisecond event timer is limited + * by 49 days on 32-bit platforms + */ + + itv.it_interval.tv_sec = 0; + itv.it_interval.tv_usec = 0; + itv.it_value.tv_sec = 30 * 24 * 60 * 60; + itv.it_value.tv_usec = 0; + + if (setitimer(ITIMER_REAL, &itv, NULL) == -1) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "setitimer() failed"); + } + + live = 1; + + } else { + ngx_init_temp_number(); + + for (i = 0; ngx_modules[i]; i++) { + if (ngx_modules[i]->init_process) { + if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) { + /* fatal */ + exit(1); + } + } + } + } + + ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, + ngx_core_module); + + /* a cycle with the same configuration because a new one is invalid */ + + for ( ;; ) { + + /* an event loop */ + + for ( ;; ) { + + if (ngx_process == NGX_PROCESS_MASTER) { + if (delay) { + delay *= 2; + + ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, + "temination cycle: %d", delay); + + itv.it_interval.tv_sec = 0; + itv.it_interval.tv_usec = 0; + itv.it_value.tv_sec = delay / 1000; + itv.it_value.tv_usec = (delay % 1000 ) * 1000; + + if (setitimer(ITIMER_REAL, &itv, NULL) == -1) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "setitimer() failed"); + } + } + + ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, + "sigsuspend"); + + sigsuspend(&set); + + ngx_gettimeofday(&tv); + ngx_time_update(tv.tv_sec); + + ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, + "wake up"); + + } else { /* NGX_PROCESS_SINGLE */ + ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, + "worker cycle"); + + ngx_process_events(cycle->log); + live = 0; + } + + if (ngx_reap) { + ngx_reap = 0; + ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, + "reap childs"); + + live = 0; + for (i = 0; i < ngx_last_process; i++) { + + ngx_log_debug5(NGX_LOG_DEBUG_EVENT, cycle->log, 0, + "child: " PID_T_FMT + " e:%d t:%d d:%d r:%d", + ngx_processes[i].pid, + ngx_processes[i].exiting, + ngx_processes[i].exited, + ngx_processes[i].detached, + ngx_processes[i].respawn); + + if (ngx_processes[i].exited) { + + if (ngx_processes[i].respawn + && !ngx_processes[i].exiting + && !ngx_terminate + && !ngx_quit) + { + if (ngx_spawn_process(cycle, + ngx_processes[i].proc, + ngx_processes[i].data, + ngx_processes[i].name, i) + == NGX_ERROR) + { + ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, + "can not respawn %s", + ngx_processes[i].name); + continue; + } + + live = 1; + + continue; + } + + if (ngx_processes[i].pid == ngx_new_binary) { + ngx_new_binary = 0; + + /* TODO: if (ngx_noaccept) ngx_configure = 1 */ + } + + if (i != --ngx_last_process) { + ngx_processes[i--] = + ngx_processes[ngx_last_process]; + } + + } else if (ngx_processes[i].exiting + || !ngx_processes[i].detached) + { + live = 1; + } + } + } + + if (!live && (ngx_terminate || ngx_quit)) { + ngx_master_exit(cycle, ctx); + } + + if (ngx_terminate) { + if (delay == 0) { + delay = 50; + } + + if (delay > 1000) { + signo = SIGKILL; + } else { + signo = ngx_signal_value(NGX_TERMINATE_SIGNAL); + } + + } else if (ngx_quit) { + signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL); + + } else if (ngx_timer) { + signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL); + + } else { + + if (ngx_noaccept) { + signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL); + } + + if (ngx_change_binary) { + ngx_change_binary = 0; + ngx_log_error(NGX_LOG_INFO, cycle->log, 0, + "changing binary"); + ngx_new_binary = ngx_exec_new_binary(cycle, ctx->argv); + } + + if (ngx_reconfigure) { + signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL); + ngx_log_error(NGX_LOG_INFO, cycle->log, 0, + "reconfiguring"); + } + + if (ngx_reopen) { + if (ngx_process == NGX_PROCESS_MASTER) { + if (ccf->worker_reopen != 0) { + signo = ngx_signal_value(NGX_REOPEN_SIGNAL); + ngx_reopen = 0; + + } else if (ngx_noaccept) { + ngx_reopen = 0; + + } else { + signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL); + } + + } else { /* NGX_PROCESS_SINGLE */ + ngx_reopen = 0; + } + + ngx_log_error(NGX_LOG_INFO, cycle->log, 0, + "reopening logs"); + ngx_reopen_files(cycle, + ccf->worker_reopen != 0 ? ccf->user : (uid_t) -1); + } + } + + if (signo) { + for (i = 0; i < ngx_last_process; i++) { + + if (ngx_processes[i].detached) { + continue; + } + + ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0, + "kill (" PID_T_FMT ", %d)" , + ngx_processes[i].pid, signo); + + if (kill(ngx_processes[i].pid, signo) == -1) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "kill(%d, %d) failed", + ngx_processes[i].pid, signo); + continue; + } + + if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL)) { + ngx_processes[i].exiting = 1; + } + } + + signo = 0; + } + + if (ngx_reopen || ngx_reconfigure || ngx_timer) { + break; + } + } + + if (ngx_reopen) { + ngx_reopen = 0; + + } else if (ngx_timer) { + ngx_timer = 0; + + } else if (ngx_noaccept) { + ngx_noaccept = 0; + ngx_reconfigure = 0; + + } else { + cycle = ngx_init_cycle(cycle); + if (cycle == NULL) { + cycle = (ngx_cycle_t *) ngx_cycle; + continue; + } + + ngx_cycle = cycle; + ngx_reconfigure = 0; + } + + break; + } + } +} + + +static void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx) +{ + char *name; + + if (ngx_inherited && getppid() > 1) { + name = ctx->pid.name.data; + + } else { + name = ctx->name; + } + + if (ngx_delete_file(name) == NGX_FILE_ERROR) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + ngx_delete_file_n " \"%s\" failed", name); + } + + ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exit"); + exit(0); +} + + +static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data) +{ + sigset_t set; + ngx_int_t i; + ngx_listening_t *ls; + ngx_core_conf_t *ccf; +#if (NGX_THREADS) + ngx_tid_t tid; +#endif + + ngx_process = NGX_PROCESS_WORKER; + ngx_last_process = 0; + + ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module); + + if (ccf->group != (gid_t) NGX_CONF_UNSET) { + if (setuid(ccf->group) == -1) { + ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno, + "setgid(%d) failed", ccf->group); + /* fatal */ + exit(2); + } + } + + if (ccf->user != (uid_t) NGX_CONF_UNSET && geteuid() == 0) { + if (setuid(ccf->user) == -1) { + ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno, + "setuid(%d) failed", ccf->user); + /* fatal */ + exit(2); + } + } + +#if (HAVE_PR_SET_DUMPABLE) + + /* allow coredump after setuid() in Linux 2.4.x */ + + if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) == -1) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "prctl(PR_SET_DUMPABLE) failed"); + } + +#endif + + sigemptyset(&set); + + if (sigprocmask(SIG_SETMASK, &set, NULL) == -1) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "sigprocmask() failed"); + } + + ngx_init_temp_number(); + + /* + * disable deleting previous events for the listening sockets because + * in the worker processes there are no events at all at this point + */ + ls = cycle->listening.elts; + for (i = 0; i < cycle->listening.nelts; i++) { + ls[i].remain = 0; + } + + for (i = 0; ngx_modules[i]; i++) { + if (ngx_modules[i]->init_process) { + if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) { + /* fatal */ + exit(1); + } + } + } + + ngx_setproctitle("worker process"); + +#if (NGX_THREADS) + + if (ngx_init_threads(5, 128 * 1024 * 1024, cycle) == NGX_ERROR) { + /* fatal */ + exit(1); + } + + for (i = 0; i < 1; i++) { + if (ngx_create_thread(&tid, ngx_worker_thread_cycle, + cycle, cycle->log) != 0) + { + /* fatal */ + exit(1); + } + } + +#endif + + for ( ;; ) { + ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle"); + + ngx_process_events(cycle->log); + + if (ngx_terminate) { + ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting"); + exit(0); + } + + if (ngx_quit) { + ngx_log_error(NGX_LOG_INFO, cycle->log, 0, + "gracefully shutting down"); + ngx_setproctitle("worker process is shutting down"); + break; + } + + if (ngx_reopen) { + ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs"); + ngx_reopen_files(cycle, -1); + ngx_reopen = 0; + } + } + + ngx_close_listening_sockets(cycle); + + for ( ;; ) { + if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) { + ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting"); + exit(0); + } + + ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle"); + + ngx_process_events(cycle->log); + + if (ngx_reopen) { + ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs"); + ngx_reopen_files(cycle, -1); + ngx_reopen = 0; + } + } +} + + +#if (NGX_THREADS) + +int ngx_worker_thread_cycle(void *data) +{ + ngx_cycle_t *cycle = data; + + struct timeval tv; + + /* STUB */ + + ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno, + "thread %d started", ngx_thread_self()); + + ngx_setproctitle("worker thread"); + + sleep(5); + + ngx_gettimeofday(&tv); + ngx_time_update(tv.tv_sec); + + ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno, + "thread %d done", ngx_thread_self()); + + return 1; +} + +#endif