nginx/src/os/unix/ngx_process_cycle.c

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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
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#include <nginx.h>
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static void ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n,
ngx_int_t type);
static void ngx_signal_worker_processes(ngx_cycle_t *cycle, int signo);
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static ngx_uint_t ngx_reap_childs(ngx_cycle_t *cycle);
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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);
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static void ngx_channel_handler(ngx_event_t *ev);
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#if (NGX_THREADS)
static int ngx_worker_thread_cycle(void *data);
#endif
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ngx_uint_t ngx_process;
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ngx_pid_t ngx_pid;
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ngx_uint_t ngx_threaded;
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sig_atomic_t ngx_reap;
sig_atomic_t ngx_timer;
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sig_atomic_t ngx_sigio;
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sig_atomic_t ngx_terminate;
sig_atomic_t ngx_quit;
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ngx_uint_t ngx_exiting;
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sig_atomic_t ngx_reconfigure;
sig_atomic_t ngx_reopen;
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sig_atomic_t ngx_change_binary;
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ngx_pid_t ngx_new_binary;
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ngx_uint_t ngx_inherited;
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sig_atomic_t ngx_noaccept;
ngx_uint_t ngx_noaccepting;
ngx_uint_t ngx_restart;
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u_char master_process[] = "master process";
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void ngx_master_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
{
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char *title;
u_char *p;
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size_t size;
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ngx_int_t i;
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sigset_t set;
struct timeval tv;
struct itimerval itv;
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ngx_uint_t live;
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ngx_msec_t delay;
ngx_core_conf_t *ccf;
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigaddset(&set, SIGALRM);
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sigaddset(&set, SIGIO);
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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);
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size = sizeof(master_process);
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for (i = 0; i < ctx->argc; i++) {
size += ngx_strlen(ctx->argv[i]) + 1;
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}
title = ngx_palloc(cycle->pool, size);
p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
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for (i = 0; i < ctx->argc; i++) {
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*p++ = ' ';
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p = ngx_cpystrn(p, (u_char *) ctx->argv[i], size);
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}
ngx_setproctitle(title);
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ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
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ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
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ngx_new_binary = 0;
delay = 0;
live = 1;
for ( ;; ) {
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");
if (ngx_reap) {
ngx_reap = 0;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap childs");
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live = ngx_reap_childs(cycle);
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}
if (!live && (ngx_terminate || ngx_quit)) {
ngx_master_exit(cycle, ctx);
}
if (ngx_terminate) {
if (delay == 0) {
delay = 50;
}
if (delay > 1000) {
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ngx_signal_worker_processes(cycle, SIGKILL);
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} else {
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ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_TERMINATE_SIGNAL));
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}
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continue;
}
if (ngx_quit) {
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
continue;
}
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if (ngx_timer) {
ngx_timer = 0;
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_JUST_RESPAWN);
live = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
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if (ngx_reconfigure) {
ngx_reconfigure = 0;
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if (ngx_new_binary) {
ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "start new workers");
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_JUST_RESPAWN);
continue;
}
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reconfiguring");
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
ngx_cycle = cycle;
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
ngx_core_module);
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ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_JUST_RESPAWN);
live = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
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if (ngx_restart) {
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ngx_restart = 0;
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ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
live = 1;
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}
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if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, ccf->user);
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_REOPEN_SIGNAL));
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}
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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);
}
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if (ngx_noaccept) {
ngx_noaccept = 0;
ngx_noaccepting = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
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}
}
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void ngx_single_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
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{
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ngx_uint_t i;
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#if 0
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ngx_setproctitle("single worker process");
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#endif
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ngx_init_temp_number();
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for (i = 0; ngx_modules[i]; i++) {
if (ngx_modules[i]->init_process) {
if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) {
/* fatal */
exit(2);
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}
}
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}
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for ( ;; ) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
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ngx_process_events(cycle);
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if (ngx_terminate || ngx_quit) {
ngx_master_exit(cycle, ctx);
}
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if (ngx_reconfigure) {
ngx_reconfigure = 0;
ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reconfiguring");
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cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
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}
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ngx_cycle = cycle;
}
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if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, (ngx_uid_t) -1);
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}
}
}
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static void ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n,
ngx_int_t type)
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{
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ngx_int_t i;
ngx_channel_t ch;
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struct itimerval itv;
ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "start worker processes");
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ch.command = NGX_CMD_OPEN_CHANNEL;
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while (n--) {
ngx_spawn_process(cycle, ngx_worker_process_cycle, NULL,
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"worker process", type);
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ch.pid = ngx_processes[ngx_process_slot].pid;
ch.slot = ngx_process_slot;
ch.fd = ngx_processes[ngx_process_slot].channel[0];
for (i = 0; i < ngx_last_process - 1; i++) {
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ngx_log_debug4(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"pass channel s: %d pid:" PID_T_FMT " fd:%d to:"
PID_T_FMT, ch.slot, ch.pid, ch.fd, ngx_processes[i].pid);
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/* TODO: NGX_AGAIN */
ngx_write_channel(ngx_processes[i].channel[0],
&ch, sizeof(ngx_channel_t), cycle->log);
}
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}
/*
* we have to limit the maximum life time of the worker processes
* by 10 days because our millisecond event timer is limited
* by 24 days on 32-bit platforms
*/
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = 10 * 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");
}
}
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static void ngx_signal_worker_processes(ngx_cycle_t *cycle, int signo)
{
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ngx_int_t i;
ngx_err_t err;
ngx_channel_t ch;
switch (signo) {
case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
ch.command = NGX_CMD_QUIT;
break;
case ngx_signal_value(NGX_TERMINATE_SIGNAL):
ch.command = NGX_CMD_TERMINATE;
break;
case ngx_signal_value(NGX_REOPEN_SIGNAL):
ch.command = NGX_CMD_REOPEN;
break;
default:
ch.command = 0;
}
ch.fd = -1;
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for (i = 0; i < ngx_last_process; i++) {
if (ngx_processes[i].detached) {
continue;
}
if (ngx_processes[i].just_respawn) {
ngx_processes[i].just_respawn = 0;
continue;
}
if (ngx_processes[i].exiting
&& signo == ngx_signal_value(NGX_SHUTDOWN_SIGNAL))
{
continue;
}
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if (ch.command) {
if (ngx_write_channel(ngx_processes[i].channel[0],
&ch, sizeof(ngx_channel_t), cycle->log) == NGX_OK)
{
if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
ngx_processes[i].exiting = 1;
}
continue;
}
}
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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) {
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err = ngx_errno;
ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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"kill(%d, %d) failed",
ngx_processes[i].pid, signo);
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if (err == NGX_ESRCH) {
ngx_processes[i].exited = 1;
ngx_processes[i].exiting = 0;
ngx_reap = 1;
}
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continue;
}
if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
ngx_processes[i].exiting = 1;
}
}
}
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static ngx_uint_t ngx_reap_childs(ngx_cycle_t *cycle)
{
ngx_int_t i, n;
ngx_uint_t live;
ngx_channel_t ch;
ch.command = NGX_CMD_CLOSE_CHANNEL;
ch.fd = -1;
live = 0;
for (i = 0; i < ngx_last_process; i++) {
ngx_log_debug6(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"child: " PID_T_FMT " e:%d t:%d d:%d r:%d j:%d",
ngx_processes[i].pid,
ngx_processes[i].exiting,
ngx_processes[i].exited,
ngx_processes[i].detached,
ngx_processes[i].respawn,
ngx_processes[i].just_respawn);
if (ngx_processes[i].exited) {
if (!ngx_processes[i].detached) {
ngx_close_channel(ngx_processes[i].channel, cycle->log);
ngx_processes[i].channel[0] = -1;
ngx_processes[i].channel[1] = -1;
ch.pid = ngx_processes[i].pid;
ch.slot = i;
for (n = 0; n < ngx_last_process; n++) {
if (ngx_processes[n].exited
|| ngx_processes[n].channel[0] == -1)
{
continue;
}
ngx_log_debug3(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"pass close channel s: %d pid:" PID_T_FMT
" to:" PID_T_FMT, ch.slot, ch.pid, ngx_processes[n].pid);
/* TODO: NGX_AGAIN */
ngx_write_channel(ngx_processes[n].channel[0],
&ch, sizeof(ngx_channel_t), cycle->log);
}
}
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;
if (ngx_noaccepting) {
ngx_restart = 1;
ngx_noaccepting = 0;
}
}
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;
}
}
return live;
}
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static void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
{
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ngx_delete_pidfile(cycle);
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exit");
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ngx_destroy_pool(cycle->pool);
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exit(0);
}
static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
{
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sigset_t set;
ngx_int_t n;
ngx_uint_t i;
ngx_listening_t *ls;
ngx_core_conf_t *ccf;
ngx_connection_t *c;
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#if (NGX_THREADS)
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ngx_tid_t tid;
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#endif
ngx_process = NGX_PROCESS_WORKER;
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
if (ccf->group != (gid_t) NGX_CONF_UNSET) {
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if (setgid(ccf->group) == -1) {
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ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
"setgid(%d) failed", ccf->group);
/* fatal */
exit(2);
}
}
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if (ccf->user != (uid_t) NGX_CONF_UNSET) {
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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 */
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exit(2);
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}
}
}
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for (n = 0; n <= ngx_last_process; n++) {
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if (n == ngx_process_slot) {
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if (close(ngx_processes[n].channel[0]) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"close() failed");
}
continue;
}
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if (close(ngx_processes[n].channel[1]) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"close() failed");
}
}
#if 0
ngx_last_process = 0;
#endif
c = &cycle->connections[ngx_channel];
ngx_memzero(c, sizeof(ngx_connection_t));
c->fd = ngx_channel;
c->pool = cycle->pool;
c->read = &cycle->read_events[ngx_channel];
c->write = &cycle->write_events[ngx_channel];
ngx_memzero(c->read, sizeof(ngx_event_t));
ngx_memzero(c->write, sizeof(ngx_event_t));
c->log = cycle->log;
c->read->log = cycle->log;
c->write->log = cycle->log;
c->read->index = NGX_INVALID_INDEX;
c->write->index = NGX_INVALID_INDEX;
c->read->data = c;
c->write->data = c;
c->read->event_handler = ngx_channel_handler;
if (ngx_add_conn) {
if (ngx_add_conn(c) == NGX_ERROR) {
/* fatal */
exit(2);
}
} else {
if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
/* fatal */
exit(2);
}
}
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ngx_setproctitle("worker process");
#if (NGX_THREADS)
if (ngx_init_threads(5, 128 * 1024 * 1024, cycle) == NGX_ERROR) {
/* fatal */
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exit(2);
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}
for (i = 0; i < 1; i++) {
if (ngx_create_thread(&tid, ngx_worker_thread_cycle,
cycle, cycle->log) != 0)
{
/* fatal */
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exit(2);
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}
}
#endif
for ( ;; ) {
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if (ngx_exiting
&& 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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/*
* we do not destroy cycle->pool here because a signal handler
* that uses cycle->log can be called at this point
*/
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exit(0);
}
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
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ngx_process_events(cycle);
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if (ngx_terminate) {
ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
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/*
* we do not destroy cycle->pool here because a signal handler
* that uses cycle->log can be called at this point
*/
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exit(0);
}
if (ngx_quit) {
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ngx_quit = 0;
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
"gracefully shutting down");
ngx_setproctitle("worker process is shutting down");
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if (!ngx_exiting) {
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ngx_close_listening_sockets(cycle);
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ngx_exiting = 1;
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}
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}
if (ngx_reopen) {
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ngx_reopen = 0;
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs");
ngx_reopen_files(cycle, -1);
}
}
}
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static void ngx_channel_handler(ngx_event_t *ev)
{
ngx_int_t n;
ngx_channel_t ch;
ngx_connection_t *c;
c = ev->data;
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ngx_log_debug0(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel handler");
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n = ngx_read_channel(c->fd, &ch, sizeof(ngx_channel_t), ev->log);
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ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel: %d", n);
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if (n <= 0) {
return;
}
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ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0,
"channel command: %d", ch.command);
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switch (ch.command) {
case NGX_CMD_QUIT:
ngx_quit = 1;
break;
case NGX_CMD_TERMINATE:
ngx_terminate = 1;
break;
case NGX_CMD_REOPEN:
ngx_reopen = 1;
break;
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case NGX_CMD_OPEN_CHANNEL:
ngx_log_debug3(NGX_LOG_DEBUG_CORE, ev->log, 0,
"get channel s:%d pid:" PID_T_FMT " fd:%d",
ch.slot, ch.pid, ch.fd);
ngx_processes[ch.slot].pid = ch.pid;
ngx_processes[ch.slot].channel[0] = ch.fd;
break;
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case NGX_CMD_CLOSE_CHANNEL:
ngx_log_debug4(NGX_LOG_DEBUG_CORE, ev->log, 0,
"close channel s:%d pid:" PID_T_FMT " our:" PID_T_FMT
" fd:%d",
ch.slot, ch.pid, ngx_processes[ch.slot].pid,
ngx_processes[ch.slot].channel[0]);
if (close(ngx_processes[ch.slot].channel[0]) == -1) {
ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, "close() failed");
}
ngx_processes[ch.slot].channel[0] = -1;
break;
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}
}
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#if (NGX_THREADS)
int ngx_worker_thread_cycle(void *data)
{
ngx_cycle_t *cycle = data;
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ngx_err_t err;
sigset_t set;
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struct timeval tv;
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sigfillset(&set);
sigdelset(&set, SIGALRM);
sigdelset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
sigdelset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
err = ngx_thread_sigmask(SIG_BLOCK, &set, NULL);
if (err) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
ngx_thread_sigmask_n " failed");
return 1;
}
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/* 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
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ngx_int_t ngx_write_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size,
ngx_log_t *log)
{
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ssize_t n;
ngx_err_t err;
struct iovec iov[1];
struct msghdr msg;
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#if (HAVE_MSGHDR_MSG_CONTROL)
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union {
struct cmsghdr cm;
char space[CMSG_SPACE(sizeof(int))];
} cmsg;
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if (ch->fd == -1) {
msg.msg_control = NULL;
msg.msg_controllen = 0;
} else {
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msg.msg_control = (caddr_t) &cmsg;
msg.msg_controllen = sizeof(cmsg);
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cmsg.cm.cmsg_len = sizeof(cmsg);
cmsg.cm.cmsg_level = SOL_SOCKET;
cmsg.cm.cmsg_type = SCM_RIGHTS;
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*(int *) CMSG_DATA(&cmsg.cm) = ch->fd;
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}
#else
if (ch->fd == -1) {
msg.msg_accrights = NULL;
msg.msg_accrightslen = 0;
} else {
msg.msg_accrights = (caddr_t) &ch->fd;
msg.msg_accrightslen = sizeof(int);
}
#endif
iov[0].iov_base = (char *) ch;
iov[0].iov_len = size;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
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n = sendmsg(s, &msg, 0);
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if (n == -1) {
err = ngx_errno;
if (err == NGX_EAGAIN) {
return NGX_AGAIN;
}
ngx_log_error(NGX_LOG_ALERT, log, err, "sendmsg() failed");
return NGX_ERROR;
}
return NGX_OK;
}
ngx_int_t ngx_read_channel(ngx_socket_t s, ngx_channel_t *ch, size_t size,
ngx_log_t *log)
{
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ssize_t n;
ngx_err_t err;
struct iovec iov[1];
struct msghdr msg;
#if (HAVE_MSGHDR_MSG_CONTROL)
union {
struct cmsghdr cm;
char space[CMSG_SPACE(sizeof(int))];
} cmsg;
#else
int fd;
#endif
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iov[0].iov_base = (char *) ch;
iov[0].iov_len = size;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
#if (HAVE_MSGHDR_MSG_CONTROL)
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msg.msg_control = (caddr_t) &cmsg;
msg.msg_controllen = sizeof(cmsg);
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#else
msg.msg_accrights = (caddr_t) &fd;
msg.msg_accrightslen = sizeof(int);
#endif
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n = recvmsg(s, &msg, 0);
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if (n == -1) {
err = ngx_errno;
if (err == NGX_EAGAIN) {
return NGX_AGAIN;
}
ngx_log_error(NGX_LOG_ALERT, log, err, "recvmsg() failed");
return NGX_ERROR;
}
if ((size_t) n < sizeof(ngx_channel_t)) {
ngx_log_error(NGX_LOG_ALERT, log, 0,
"recvmsg() returned not enough data");
return NGX_ERROR;
}
#if (HAVE_MSGHDR_MSG_CONTROL)
if (ch->command == NGX_CMD_OPEN_CHANNEL) {
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if (cmsg.cm.cmsg_len < sizeof(cmsg)) {
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ngx_log_error(NGX_LOG_ALERT, log, 0,
"recvmsg() returned too small ancillary data");
return NGX_ERROR;
}
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if (cmsg.cm.cmsg_level != SOL_SOCKET || cmsg.cm.cmsg_type != SCM_RIGHTS)
{
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ngx_log_error(NGX_LOG_ALERT, log, 0,
"recvmsg() returned invalid ancillary data "
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"level %d or type %d",
cmsg.cm.cmsg_level, cmsg.cm.cmsg_type);
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return NGX_ERROR;
}
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ch->fd = *(int *) CMSG_DATA(&cmsg.cm);
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}
if (msg.msg_flags & (MSG_TRUNC|MSG_CTRUNC)) {
ngx_log_error(NGX_LOG_ALERT, log, 0,
"recvmsg() truncated data");
}
#else
if (ch->command == NGX_CMD_OPEN_CHANNEL) {
if (msg.msg_accrightslen != sizeof(int)) {
ngx_log_error(NGX_LOG_ALERT, log, 0,
"recvmsg() returned no ancillary data");
return NGX_ERROR;
}
ch->fd = fd;
}
#endif
return n;
}