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Diffstat (limited to 'src/event/modules/ngx_rtsig_module.c')
-rw-r--r--src/event/modules/ngx_rtsig_module.c735
1 files changed, 0 insertions, 735 deletions
diff --git a/src/event/modules/ngx_rtsig_module.c b/src/event/modules/ngx_rtsig_module.c
deleted file mode 100644
index b120fecde..000000000
--- a/src/event/modules/ngx_rtsig_module.c
+++ /dev/null
@@ -1,735 +0,0 @@
-
-/*
- * Copyright (C) Igor Sysoev
- * Copyright (C) Nginx, Inc.
- */
-
-
-#include <ngx_config.h>
-#include <ngx_core.h>
-#include <ngx_event.h>
-
-
-#if (NGX_TEST_BUILD_RTSIG)
-
-#if (NGX_DARWIN)
-
-#define SIGRTMIN 33
-#define si_fd __pad[0]
-
-#else
-
-#ifdef SIGRTMIN
-#define si_fd _reason.__spare__.__spare2__[0]
-#else
-#define SIGRTMIN 33
-#define si_fd __spare__[0]
-#endif
-
-#endif
-
-#define F_SETSIG 10
-#define KERN_RTSIGNR 30
-#define KERN_RTSIGMAX 31
-
-int sigtimedwait(const sigset_t *set, siginfo_t *info,
- const struct timespec *timeout);
-
-int sigtimedwait(const sigset_t *set, siginfo_t *info,
- const struct timespec *timeout)
-{
- return -1;
-}
-
-int ngx_linux_rtsig_max;
-
-#endif
-
-
-typedef struct {
- ngx_uint_t signo;
- ngx_uint_t overflow_events;
- ngx_uint_t overflow_test;
- ngx_uint_t overflow_threshold;
-} ngx_rtsig_conf_t;
-
-
-extern ngx_event_module_t ngx_poll_module_ctx;
-
-static ngx_int_t ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer);
-static void ngx_rtsig_done(ngx_cycle_t *cycle);
-static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c);
-static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c,
- ngx_uint_t flags);
-static ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle,
- ngx_msec_t timer, ngx_uint_t flags);
-static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle,
- ngx_msec_t timer, ngx_uint_t flags);
-
-static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle);
-static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf);
-static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
- void *post, void *data);
-
-
-static sigset_t set;
-static ngx_uint_t overflow, overflow_current;
-static struct pollfd *overflow_list;
-
-
-static ngx_str_t rtsig_name = ngx_string("rtsig");
-
-static ngx_conf_num_bounds_t ngx_overflow_threshold_bounds = {
- ngx_check_ngx_overflow_threshold_bounds, 2, 10
-};
-
-
-static ngx_command_t ngx_rtsig_commands[] = {
-
- { ngx_string("rtsig_signo"),
- NGX_EVENT_CONF|NGX_CONF_TAKE1,
- ngx_conf_set_num_slot,
- 0,
- offsetof(ngx_rtsig_conf_t, signo),
- NULL },
-
- { ngx_string("rtsig_overflow_events"),
- NGX_EVENT_CONF|NGX_CONF_TAKE1,
- ngx_conf_set_num_slot,
- 0,
- offsetof(ngx_rtsig_conf_t, overflow_events),
- NULL },
-
- { ngx_string("rtsig_overflow_test"),
- NGX_EVENT_CONF|NGX_CONF_TAKE1,
- ngx_conf_set_num_slot,
- 0,
- offsetof(ngx_rtsig_conf_t, overflow_test),
- NULL },
-
- { ngx_string("rtsig_overflow_threshold"),
- NGX_EVENT_CONF|NGX_CONF_TAKE1,
- ngx_conf_set_num_slot,
- 0,
- offsetof(ngx_rtsig_conf_t, overflow_threshold),
- &ngx_overflow_threshold_bounds },
-
- ngx_null_command
-};
-
-
-ngx_event_module_t ngx_rtsig_module_ctx = {
- &rtsig_name,
- ngx_rtsig_create_conf, /* create configuration */
- ngx_rtsig_init_conf, /* init configuration */
-
- {
- NULL, /* add an event */
- NULL, /* delete an event */
- NULL, /* enable an event */
- NULL, /* disable an event */
- ngx_rtsig_add_connection, /* add an connection */
- ngx_rtsig_del_connection, /* delete an connection */
- NULL, /* trigger a notify */
- ngx_rtsig_process_events, /* process the events */
- ngx_rtsig_init, /* init the events */
- ngx_rtsig_done, /* done the events */
- }
-
-};
-
-ngx_module_t ngx_rtsig_module = {
- NGX_MODULE_V1,
- &ngx_rtsig_module_ctx, /* module context */
- ngx_rtsig_commands, /* module directives */
- NGX_EVENT_MODULE, /* module type */
- NULL, /* init master */
- NULL, /* init module */
- NULL, /* init process */
- NULL, /* init thread */
- NULL, /* exit thread */
- NULL, /* exit process */
- NULL, /* exit master */
- NGX_MODULE_V1_PADDING
-};
-
-
-static ngx_int_t
-ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer)
-{
- ngx_rtsig_conf_t *rtscf;
-
- rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
-
- sigemptyset(&set);
- sigaddset(&set, (int) rtscf->signo);
- sigaddset(&set, (int) rtscf->signo + 1);
- sigaddset(&set, SIGIO);
- sigaddset(&set, SIGALRM);
-
- if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
- ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
- "sigprocmask() failed");
- return NGX_ERROR;
- }
-
- if (overflow_list) {
- ngx_free(overflow_list);
- }
-
- overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
- cycle->log);
- if (overflow_list == NULL) {
- return NGX_ERROR;
- }
-
- ngx_io = ngx_os_io;
-
- ngx_event_actions = ngx_rtsig_module_ctx.actions;
-
- ngx_event_flags = NGX_USE_RTSIG_EVENT
- |NGX_USE_GREEDY_EVENT
- |NGX_USE_FD_EVENT;
-
- return NGX_OK;
-}
-
-
-static void
-ngx_rtsig_done(ngx_cycle_t *cycle)
-{
- ngx_free(overflow_list);
-
- overflow_list = NULL;
-}
-
-
-static ngx_int_t
-ngx_rtsig_add_connection(ngx_connection_t *c)
-{
- ngx_uint_t signo;
- ngx_rtsig_conf_t *rtscf;
-
- if (c->read->accept && c->read->disabled) {
-
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
- "rtsig enable connection: fd:%d", c->fd);
-
- if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(F_SETOWN) failed");
- return NGX_ERROR;
- }
-
- c->read->active = 1;
- c->read->disabled = 0;
- }
-
- rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
-
- signo = rtscf->signo + c->read->instance;
-
- ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
- "rtsig add connection: fd:%d signo:%ui", c->fd, signo);
-
- if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
- return NGX_ERROR;
- }
-
- if (fcntl(c->fd, F_SETSIG, (int) signo) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(F_SETSIG) failed");
- return NGX_ERROR;
- }
-
- if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(F_SETOWN) failed");
- return NGX_ERROR;
- }
-
-#if (NGX_HAVE_ONESIGFD)
- if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(F_SETAUXFL) failed");
- return NGX_ERROR;
- }
-#endif
-
- c->read->active = 1;
- c->write->active = 1;
-
- return NGX_OK;
-}
-
-
-static ngx_int_t
-ngx_rtsig_del_connection(ngx_connection_t *c, ngx_uint_t flags)
-{
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
- "rtsig del connection: fd:%d", c->fd);
-
- if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
-
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
- "rtsig disable connection: fd:%d", c->fd);
-
- c->read->active = 0;
- c->read->disabled = 1;
- return NGX_OK;
- }
-
- if (flags & NGX_CLOSE_EVENT) {
- c->read->active = 0;
- c->write->active = 0;
- return NGX_OK;
- }
-
- if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
- ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
- "fcntl(O_RDWR|O_NONBLOCK) failed");
- return NGX_ERROR;
- }
-
- c->read->active = 0;
- c->write->active = 0;
-
- return NGX_OK;
-}
-
-
-static ngx_int_t
-ngx_rtsig_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
-{
- int signo;
- ngx_int_t instance;
- ngx_err_t err;
- siginfo_t si;
- ngx_event_t *rev, *wev;
- ngx_queue_t *queue;
- struct timespec ts, *tp;
- struct sigaction sa;
- ngx_connection_t *c;
- ngx_rtsig_conf_t *rtscf;
-
- if (timer == NGX_TIMER_INFINITE) {
- tp = NULL;
-
- } else {
- ts.tv_sec = timer / 1000;
- ts.tv_nsec = (timer % 1000) * 1000000;
- tp = &ts;
- }
-
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig timer: %M", timer);
-
- /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
-
- signo = sigtimedwait(&set, &si, tp);
-
- if (signo == -1) {
- err = ngx_errno;
-
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
- "rtsig signo:%d", signo);
-
- if (flags & NGX_UPDATE_TIME) {
- ngx_time_update();
- }
-
- if (err == NGX_EAGAIN) {
-
- /* timeout */
-
- if (timer != NGX_TIMER_INFINITE) {
- return NGX_AGAIN;
- }
-
- ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
- "sigtimedwait() returned EAGAIN without timeout");
- return NGX_ERROR;
- }
-
- ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
- cycle->log, err, "sigtimedwait() failed");
- return NGX_ERROR;
- }
-
- ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig signo:%d fd:%d band:%04Xd",
- signo, si.si_fd, si.si_band);
-
- if (flags & NGX_UPDATE_TIME) {
- ngx_time_update();
- }
-
- rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
-
- if (signo == (int) rtscf->signo || signo == (int) rtscf->signo + 1) {
-
- if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
- return NGX_OK;
- }
-
- c = ngx_cycle->files[si.si_fd];
-
- if (c == NULL) {
-
- /* the stale event */
-
- return NGX_OK;
- }
-
- instance = signo - (int) rtscf->signo;
-
- rev = c->read;
-
- if (rev->instance != instance) {
-
- /*
- * the stale event from a file descriptor
- * that was just closed in this iteration
- */
-
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig: stale event %p", c);
-
- return NGX_OK;
- }
-
- if ((si.si_band & (POLLIN|POLLHUP|POLLERR)) && rev->active) {
-
- rev->ready = 1;
-
- if (flags & NGX_POST_EVENTS) {
- queue = rev->accept ? &ngx_posted_accept_events
- : &ngx_posted_events;
-
- ngx_post_event(rev, queue);
-
- } else {
- rev->handler(rev);
- }
- }
-
- wev = c->write;
-
- if ((si.si_band & (POLLOUT|POLLHUP|POLLERR)) && wev->active) {
-
- wev->ready = 1;
-
- if (flags & NGX_POST_EVENTS) {
- ngx_post_event(wev, &ngx_posted_events);
-
- } else {
- wev->handler(wev);
- }
- }
-
- return NGX_OK;
-
- } else if (signo == SIGALRM) {
-
- ngx_time_update();
-
- return NGX_OK;
-
- } else if (signo == SIGIO) {
-
- ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
- "rt signal queue overflowed");
-
- /* flush the RT signal queue */
-
- ngx_memzero(&sa, sizeof(struct sigaction));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
-
- if (sigaction(rtscf->signo, &sa, NULL) == -1) {
- ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
- "sigaction(%d, SIG_DFL) failed", rtscf->signo);
- }
-
- if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
- ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
- "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
- }
-
- overflow = 1;
- overflow_current = 0;
- ngx_event_actions.process_events = ngx_rtsig_process_overflow;
-
- return NGX_ERROR;
-
- }
-
- ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
- "sigtimedwait() returned unexpected signal: %d", signo);
-
- return NGX_ERROR;
-}
-
-
-static ngx_int_t
-ngx_rtsig_process_overflow(ngx_cycle_t *cycle, ngx_msec_t timer,
- ngx_uint_t flags)
-{
- int name[2], rtsig_max, rtsig_nr, events, ready;
- size_t len;
- ngx_err_t err;
- ngx_uint_t tested, n, i;
- ngx_event_t *rev, *wev;
- ngx_queue_t *queue;
- ngx_connection_t *c;
- ngx_rtsig_conf_t *rtscf;
-
- ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig process overflow");
-
- rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
-
- tested = 0;
-
- for ( ;; ) {
-
- n = 0;
- while (n < rtscf->overflow_events) {
-
- if (overflow_current == cycle->connection_n) {
- break;
- }
-
- c = cycle->files[overflow_current++];
-
- if (c == NULL || c->fd == -1) {
- continue;
- }
-
- events = 0;
-
- if (c->read->active && c->read->handler) {
- events |= POLLIN;
- }
-
- if (c->write->active && c->write->handler) {
- events |= POLLOUT;
- }
-
- if (events == 0) {
- continue;
- }
-
- overflow_list[n].fd = c->fd;
- overflow_list[n].events = events;
- overflow_list[n].revents = 0;
- n++;
- }
-
- if (n == 0) {
- break;
- }
-
- for ( ;; ) {
- ready = poll(overflow_list, n, 0);
-
- ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig overflow poll:%d", ready);
-
- if (ready == -1) {
- err = ngx_errno;
- ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
- cycle->log, 0,
- "poll() failed while the overflow recover");
-
- if (err == NGX_EINTR) {
- continue;
- }
- }
-
- break;
- }
-
- if (ready <= 0) {
- continue;
- }
-
- for (i = 0; i < n; i++) {
- c = cycle->files[overflow_list[i].fd];
-
- if (c == NULL) {
- continue;
- }
-
- rev = c->read;
-
- if (rev->active
- && !rev->closed
- && rev->handler
- && (overflow_list[i].revents
- & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
- {
- tested++;
-
- rev->ready = 1;
-
- if (flags & NGX_POST_EVENTS) {
- queue = rev->accept ? &ngx_posted_accept_events
- : &ngx_posted_events;
-
- ngx_post_event(rev, queue);
-
- } else {
- rev->handler(rev);
- }
- }
-
- wev = c->write;
-
- if (wev->active
- && !wev->closed
- && wev->handler
- && (overflow_list[i].revents
- & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
- {
- tested++;
-
- wev->ready = 1;
-
- if (flags & NGX_POST_EVENTS) {
- ngx_post_event(wev, &ngx_posted_events);
-
- } else {
- wev->handler(wev);
- }
- }
- }
-
- if (tested >= rtscf->overflow_test) {
-
- if (ngx_linux_rtsig_max) {
-
- /*
- * Check the current rt queue length to prevent
- * the new overflow.
- *
- * learn the "/proc/sys/kernel/rtsig-max" value because
- * it can be changed since the last checking
- */
-
- name[0] = CTL_KERN;
- name[1] = KERN_RTSIGMAX;
- len = sizeof(rtsig_max);
-
- if (sysctl(name, 2, &rtsig_max, &len, NULL, 0) == -1) {
- ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
- "sysctl(KERN_RTSIGMAX) failed");
- return NGX_ERROR;
- }
-
- /* name[0] = CTL_KERN; */
- name[1] = KERN_RTSIGNR;
- len = sizeof(rtsig_nr);
-
- if (sysctl(name, 2, &rtsig_nr, &len, NULL, 0) == -1) {
- ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
- "sysctl(KERN_RTSIGNR) failed");
- return NGX_ERROR;
- }
-
- /*
- * drain the rt signal queue if the /"proc/sys/kernel/rtsig-nr"
- * is bigger than
- * "/proc/sys/kernel/rtsig-max" / "rtsig_overflow_threshold"
- */
-
- if (rtsig_max / (int) rtscf->overflow_threshold < rtsig_nr) {
- ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
- "rtsig queue state: %d/%d",
- rtsig_nr, rtsig_max);
- while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK)
- {
- /* void */
- }
- }
-
- } else {
-
- /*
- * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
- * so drain the rt signal queue unconditionally
- */
-
- while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK) {
- /* void */
- }
- }
-
- tested = 0;
- }
- }
-
- if (flags & NGX_UPDATE_TIME) {
- ngx_time_update();
- }
-
- ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
- "rt signal queue overflow recovered");
-
- overflow = 0;
- ngx_event_actions.process_events = ngx_rtsig_process_events;
-
- return NGX_OK;
-}
-
-
-static void *
-ngx_rtsig_create_conf(ngx_cycle_t *cycle)
-{
- ngx_rtsig_conf_t *rtscf;
-
- rtscf = ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t));
- if (rtscf == NULL) {
- return NULL;
- }
-
- rtscf->signo = NGX_CONF_UNSET;
- rtscf->overflow_events = NGX_CONF_UNSET;
- rtscf->overflow_test = NGX_CONF_UNSET;
- rtscf->overflow_threshold = NGX_CONF_UNSET;
-
- return rtscf;
-}
-
-
-static char *
-ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
-{
- ngx_rtsig_conf_t *rtscf = conf;
-
- /* LinuxThreads use the first 3 RT signals */
- ngx_conf_init_uint_value(rtscf->signo, SIGRTMIN + 10);
-
- ngx_conf_init_uint_value(rtscf->overflow_events, 16);
- ngx_conf_init_uint_value(rtscf->overflow_test, 32);
- ngx_conf_init_uint_value(rtscf->overflow_threshold, 10);
-
- return NGX_CONF_OK;
-}
-
-
-static char *
-ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf, void *post, void *data)
-{
- if (ngx_linux_rtsig_max) {
- return ngx_conf_check_num_bounds(cf, post, data);
- }
-
- ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
- "\"rtsig_overflow_threshold\" is not supported "
- "since Linux 2.6.6-mm2, ignored");
-
- return NGX_CONF_OK;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-16 19:02:21 +0000