mirror of
https://github.com/nginx/nginx.git
synced 2024-12-16 14:19:00 +08:00
533 lines
16 KiB
C
533 lines
16 KiB
C
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_event.h>
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static void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx);
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static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data);
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#if (NGX_THREADS)
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static int ngx_worker_thread_cycle(void *data);
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#endif
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ngx_int_t ngx_process;
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ngx_pid_t ngx_pid;
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ngx_pid_t ngx_new_binary;
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ngx_int_t ngx_inherited;
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sig_atomic_t ngx_reap;
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sig_atomic_t ngx_timer;
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sig_atomic_t ngx_terminate;
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sig_atomic_t ngx_quit;
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sig_atomic_t ngx_noaccept;
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sig_atomic_t ngx_reconfigure;
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sig_atomic_t ngx_reopen;
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sig_atomic_t ngx_change_binary;
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/* TODO: broken NGX_PROCESS_SINGLE */
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void ngx_master_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
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{
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int signo;
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sigset_t set;
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struct timeval tv;
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struct itimerval itv;
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ngx_uint_t i, live;
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ngx_msec_t delay;
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ngx_core_conf_t *ccf;
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sigemptyset(&set);
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sigaddset(&set, SIGCHLD);
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sigaddset(&set, SIGALRM);
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sigaddset(&set, SIGINT);
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sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
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sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
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sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
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sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
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sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
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sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
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if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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"sigprocmask() failed");
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}
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sigemptyset(&set);
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ngx_setproctitle("master process");
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ngx_new_binary = 0;
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delay = 0;
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signo = 0;
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live = 0;
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for ( ;; ) {
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "new cycle");
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if (ngx_process == NGX_PROCESS_MASTER) {
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ngx_spawn_process(cycle, ngx_worker_process_cycle, NULL,
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"worker process", NGX_PROCESS_RESPAWN);
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/*
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* we have to limit the maximum life time of the worker processes
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* by 1 month because our millisecond event timer is limited
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* by 49 days on 32-bit platforms
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*/
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itv.it_interval.tv_sec = 0;
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itv.it_interval.tv_usec = 0;
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itv.it_value.tv_sec = 30 * 24 * 60 * 60;
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itv.it_value.tv_usec = 0;
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if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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"setitimer() failed");
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}
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live = 1;
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} else {
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ngx_init_temp_number();
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for (i = 0; ngx_modules[i]; i++) {
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if (ngx_modules[i]->init_process) {
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if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) {
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/* fatal */
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exit(2);
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}
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}
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}
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}
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ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
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ngx_core_module);
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/* a cycle with the same configuration because a new one is invalid */
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for ( ;; ) {
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/* an event loop */
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for ( ;; ) {
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if (ngx_process == NGX_PROCESS_MASTER) {
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if (delay) {
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delay *= 2;
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"temination cycle: %d", delay);
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itv.it_interval.tv_sec = 0;
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itv.it_interval.tv_usec = 0;
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itv.it_value.tv_sec = delay / 1000;
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itv.it_value.tv_usec = (delay % 1000 ) * 1000;
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if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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"setitimer() failed");
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}
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}
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"sigsuspend");
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sigsuspend(&set);
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ngx_gettimeofday(&tv);
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ngx_time_update(tv.tv_sec);
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"wake up");
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} else { /* NGX_PROCESS_SINGLE */
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"worker cycle");
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ngx_process_events(cycle->log);
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live = 0;
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}
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if (ngx_reap) {
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ngx_reap = 0;
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"reap childs");
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live = 0;
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for (i = 0; i < ngx_last_process; i++) {
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ngx_log_debug5(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"child: " PID_T_FMT
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" e:%d t:%d d:%d r:%d",
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ngx_processes[i].pid,
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ngx_processes[i].exiting,
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ngx_processes[i].exited,
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ngx_processes[i].detached,
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ngx_processes[i].respawn);
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if (ngx_processes[i].exited) {
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if (ngx_processes[i].respawn
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&& !ngx_processes[i].exiting
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&& !ngx_terminate
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&& !ngx_quit)
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{
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if (ngx_spawn_process(cycle,
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ngx_processes[i].proc,
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ngx_processes[i].data,
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ngx_processes[i].name, i)
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== NGX_ERROR)
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{
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ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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"can not respawn %s",
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ngx_processes[i].name);
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continue;
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}
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live = 1;
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continue;
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}
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if (ngx_processes[i].pid == ngx_new_binary) {
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ngx_new_binary = 0;
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/* TODO: if (ngx_noaccept) ngx_configure = 1 */
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}
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if (i != --ngx_last_process) {
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ngx_processes[i--] =
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ngx_processes[ngx_last_process];
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}
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} else if (ngx_processes[i].exiting
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|| !ngx_processes[i].detached)
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{
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live = 1;
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}
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}
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}
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if (!live && (ngx_terminate || ngx_quit)) {
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ngx_master_exit(cycle, ctx);
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}
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if (ngx_terminate) {
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if (delay == 0) {
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delay = 50;
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}
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if (delay > 1000) {
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signo = SIGKILL;
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} else {
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signo = ngx_signal_value(NGX_TERMINATE_SIGNAL);
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}
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} else if (ngx_quit) {
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signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
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} else if (ngx_timer) {
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signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
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} else {
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if (ngx_noaccept) {
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signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
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}
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if (ngx_change_binary) {
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ngx_change_binary = 0;
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
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"changing binary");
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ngx_new_binary = ngx_exec_new_binary(cycle, ctx->argv);
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}
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if (ngx_reconfigure) {
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signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
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"reconfiguring");
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}
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if (ngx_reopen) {
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if (ngx_process == NGX_PROCESS_MASTER) {
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if (ccf->worker_reopen != 0) {
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signo = ngx_signal_value(NGX_REOPEN_SIGNAL);
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ngx_reopen = 0;
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} else if (ngx_noaccept) {
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ngx_reopen = 0;
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} else {
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signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
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}
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} else { /* NGX_PROCESS_SINGLE */
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ngx_reopen = 0;
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}
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
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"reopening logs");
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ngx_reopen_files(cycle,
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ccf->worker_reopen != 0 ? ccf->user : (uid_t) -1);
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}
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}
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if (signo) {
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for (i = 0; i < ngx_last_process; i++) {
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if (ngx_processes[i].detached) {
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continue;
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}
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ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
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"kill (" PID_T_FMT ", %d)" ,
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ngx_processes[i].pid, signo);
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if (kill(ngx_processes[i].pid, signo) == -1) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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"kill(%d, %d) failed",
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ngx_processes[i].pid, signo);
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continue;
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}
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if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
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ngx_processes[i].exiting = 1;
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}
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}
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signo = 0;
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}
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if (ngx_reopen || ngx_reconfigure || ngx_timer) {
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break;
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}
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}
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if (ngx_reopen) {
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ngx_reopen = 0;
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} else if (ngx_timer) {
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ngx_timer = 0;
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} else if (ngx_noaccept) {
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ngx_noaccept = 0;
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ngx_reconfigure = 0;
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} else {
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cycle = ngx_init_cycle(cycle);
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if (cycle == NULL) {
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cycle = (ngx_cycle_t *) ngx_cycle;
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continue;
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}
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ngx_cycle = cycle;
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ngx_reconfigure = 0;
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}
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break;
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}
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}
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}
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static void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
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{
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char *name;
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if (ngx_inherited && getppid() > 1) {
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name = ctx->pid.name.data;
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} else {
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name = ctx->name;
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}
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if (ngx_delete_file(name) == NGX_FILE_ERROR) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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ngx_delete_file_n " \"%s\" failed", name);
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}
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exit");
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exit(0);
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}
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static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
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{
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sigset_t set;
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ngx_int_t i;
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ngx_listening_t *ls;
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ngx_core_conf_t *ccf;
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#if (NGX_THREADS)
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ngx_tid_t tid;
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#endif
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ngx_process = NGX_PROCESS_WORKER;
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ngx_last_process = 0;
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ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
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if (ccf->group != (gid_t) NGX_CONF_UNSET) {
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if (setuid(ccf->group) == -1) {
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ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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"setgid(%d) failed", ccf->group);
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/* fatal */
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exit(2);
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}
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}
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if (ccf->user != (uid_t) NGX_CONF_UNSET && geteuid() == 0) {
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if (setuid(ccf->user) == -1) {
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ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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"setuid(%d) failed", ccf->user);
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/* fatal */
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exit(2);
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}
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}
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#if (HAVE_PR_SET_DUMPABLE)
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/* allow coredump after setuid() in Linux 2.4.x */
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if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) == -1) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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"prctl(PR_SET_DUMPABLE) failed");
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}
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#endif
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sigemptyset(&set);
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if (sigprocmask(SIG_SETMASK, &set, NULL) == -1) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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"sigprocmask() failed");
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}
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ngx_init_temp_number();
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/*
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* disable deleting previous events for the listening sockets because
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* in the worker processes there are no events at all at this point
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*/
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ls = cycle->listening.elts;
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for (i = 0; i < cycle->listening.nelts; i++) {
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ls[i].remain = 0;
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}
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for (i = 0; ngx_modules[i]; i++) {
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if (ngx_modules[i]->init_process) {
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if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) {
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/* fatal */
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exit(2);
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}
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}
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}
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ngx_setproctitle("worker process");
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#if (NGX_THREADS)
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if (ngx_init_threads(5, 128 * 1024 * 1024, cycle) == NGX_ERROR) {
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/* fatal */
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exit(2);
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}
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for (i = 0; i < 1; i++) {
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if (ngx_create_thread(&tid, ngx_worker_thread_cycle,
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cycle, cycle->log) != 0)
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{
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/* fatal */
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exit(2);
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}
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}
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#endif
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for ( ;; ) {
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
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ngx_process_events(cycle->log);
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if (ngx_terminate) {
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
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exit(0);
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}
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if (ngx_quit) {
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
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"gracefully shutting down");
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ngx_setproctitle("worker process is shutting down");
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break;
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}
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if (ngx_reopen) {
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs");
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ngx_reopen_files(cycle, -1);
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ngx_reopen = 0;
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}
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}
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ngx_close_listening_sockets(cycle);
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for ( ;; ) {
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if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) {
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
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exit(0);
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}
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
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ngx_process_events(cycle->log);
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if (ngx_reopen) {
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs");
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ngx_reopen_files(cycle, -1);
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ngx_reopen = 0;
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}
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}
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}
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#if (NGX_THREADS)
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int ngx_worker_thread_cycle(void *data)
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{
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ngx_cycle_t *cycle = data;
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ngx_err_t err;
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sigset_t set;
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struct timeval tv;
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sigfillset(&set);
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sigdelset(&set, SIGALRM);
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sigdelset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
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sigdelset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
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err = ngx_thread_sigmask(SIG_BLOCK, &set, NULL);
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if (err) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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ngx_thread_sigmask_n " failed");
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return 1;
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}
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/* STUB */
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ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno,
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"thread %d started", ngx_thread_self());
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ngx_setproctitle("worker thread");
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sleep(5);
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ngx_gettimeofday(&tv);
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ngx_time_update(tv.tv_sec);
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ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno,
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"thread %d done", ngx_thread_self());
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return 1;
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}
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#endif
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