nginx/src/core/nginx.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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#include <nginx.h>
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typedef struct {
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ngx_str_t user;
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int daemon;
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int master;
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ngx_str_t pid;
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ngx_str_t newpid;
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} ngx_core_conf_t;
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typedef struct {
ngx_file_t pid;
char *const *argv;
} ngx_master_ctx_t;
static void ngx_master_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx);
static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data);
static ngx_int_t ngx_add_inherited_sockets(ngx_cycle_t *cycle, char **envp);
static void ngx_exec_new_binary(ngx_cycle_t *cycle, char *const *argv);
static ngx_int_t ngx_core_module_init(ngx_cycle_t *cycle);
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static ngx_str_t core_name = ngx_string("core");
static ngx_command_t ngx_core_commands[] = {
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{ ngx_string("user"),
NGX_MAIN_CONF|NGX_CONF_TAKE1,
ngx_conf_set_core_str_slot,
0,
offsetof(ngx_core_conf_t, user),
NULL },
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{ ngx_string("daemon"),
NGX_MAIN_CONF|NGX_CONF_TAKE1,
ngx_conf_set_core_flag_slot,
0,
offsetof(ngx_core_conf_t, daemon),
NULL },
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{ ngx_string("master_process"),
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NGX_MAIN_CONF|NGX_CONF_TAKE1,
ngx_conf_set_core_flag_slot,
0,
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offsetof(ngx_core_conf_t, master),
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NULL },
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ngx_null_command
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};
ngx_module_t ngx_core_module = {
NGX_MODULE,
&core_name, /* module context */
ngx_core_commands, /* module directives */
NGX_CORE_MODULE, /* module type */
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ngx_core_module_init, /* init module */
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NULL /* init child */
};
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ngx_int_t ngx_max_module;
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/* STUB */
uid_t user;
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u_int ngx_connection_counter;
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ngx_int_t ngx_process;
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ngx_int_t ngx_inherited;
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ngx_int_t ngx_reap;
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ngx_int_t ngx_terminate;
ngx_int_t ngx_quit;
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ngx_int_t ngx_pause;
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ngx_int_t ngx_reconfigure;
ngx_int_t ngx_reopen;
ngx_int_t ngx_change_binary;
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int main(int argc, char *const *argv, char **envp)
{
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ngx_fd_t fd;
ngx_int_t i;
ngx_log_t *log;
ngx_cycle_t *cycle, init_cycle;
ngx_open_file_t *file;
ngx_core_conf_t *ccf;
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ngx_master_ctx_t ctx;
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#if !(WIN32)
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size_t len;
char pid[/* STUB */ 10];
struct passwd *pwd;
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#endif
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#if __FreeBSD__
ngx_debug_init();
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#endif
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/* TODO */ ngx_max_sockets = -1;
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ngx_time_init();
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#if (HAVE_PCRE)
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ngx_regex_init();
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#endif
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log = ngx_log_init_errlog();
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/* init_cycle->log is required for signal handlers */
ngx_memzero(&init_cycle, sizeof(ngx_cycle_t));
init_cycle.log = log;
ngx_cycle = &init_cycle;
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if (ngx_os_init(log) == NGX_ERROR) {
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return 1;
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}
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ngx_max_module = 0;
for (i = 0; ngx_modules[i]; i++) {
ngx_modules[i]->index = ngx_max_module++;
}
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if (!(init_cycle.pool = ngx_create_pool(1024, log))) {
return 1;
}
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if (ngx_add_inherited_sockets(&init_cycle, envp) == NGX_ERROR) {
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return 1;
}
cycle = ngx_init_cycle(&init_cycle);
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if (cycle == NULL) {
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return 1;
}
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ngx_cycle = cycle;
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ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
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ngx_process = (ccf->master != 0) ? NGX_PROCESS_MASTER : NGX_PROCESS_SINGLE;
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#if (WIN32)
#if 0
if (run_as_service) {
if (ngx_servie(cycle->log) == NGX_ERROR) {
return 1;
}
return 0;
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}
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#endif
#else
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/* STUB */
if (ccf->user.len) {
pwd = getpwnam(ccf->user.data);
if (pwd == NULL) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
"getpwnam(%s) failed", ccf->user);
return 1;
}
user = pwd->pw_uid;
}
/* */
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if (ccf->daemon != 0) {
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if (ngx_daemon(cycle->log) == NGX_ERROR) {
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return 1;
}
}
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if (dup2(cycle->log->file->fd, STDERR_FILENO) == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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"dup2(STDERR) failed");
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return 1;
}
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if (ccf->pid.len == 0) {
ccf->pid.len = sizeof(NGINX_PID) - 1;
ccf->pid.data = NGINX_PID;
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ccf->newpid.len = sizeof(NGINX_NEW_PID) - 1;
ccf->newpid.data = NGINX_NEW_PID;
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}
len = ngx_snprintf(pid, /* STUB */ 10, PID_T_FMT, ngx_getpid());
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ngx_memzero(&ctx.pid, sizeof(ngx_file_t));
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ctx.pid.name = ngx_inherited ? ccf->newpid : ccf->pid;
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ctx.pid.fd = ngx_open_file(ctx.pid.name.data, NGX_FILE_RDWR,
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NGX_FILE_CREATE_OR_OPEN);
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if (ctx.pid.fd == NGX_INVALID_FILE) {
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ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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ngx_open_file_n " \"%s\" failed", ctx.pid.name.data);
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return 1;
}
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if (ngx_write_file(&ctx.pid, pid, len, 0) == NGX_ERROR) {
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return 1;
}
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if (ngx_close_file(ctx.pid.fd) == NGX_FILE_ERROR) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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ngx_close_file_n " \"%s\" failed", ctx.pid.name.data);
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}
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#endif
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ctx.argv = argv;
ngx_master_process_cycle(cycle, &ctx);
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return 0;
}
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static 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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ngx_msec_t delay;
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struct timeval tv;
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ngx_uint_t i, live, first;
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sigset_t set, wset;
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delay = 125;
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sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
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sigaddset(&set, ngx_signal_value(NGX_PAUSE_SIGNAL));
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sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
sigemptyset(&wset);
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
}
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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,
"worker process", NGX_PROCESS_RESPAWN);
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} else {
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(1);
}
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}
}
}
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/* a cycle with the same configuration */
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for ( ;; ) {
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signo = 0;
first = 1;
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/* an event loop */
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for ( ;; ) {
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if (ngx_process == NGX_PROCESS_MASTER) {
sigsuspend(&wset);
ngx_gettimeofday(&tv);
ngx_time_update(tv.tv_sec);
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} else if (ngx_process == NGX_PROCESS_SINGLE) {
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"worker cycle");
ngx_process_events(cycle->log);
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} else if (ngx_process == NGX_PROCESS_QUITING
|| ngx_process == NGX_PROCESS_PAUSED)
{
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"quit cycle");
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if (sigprocmask(SIG_UNBLOCK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
continue;
}
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if (ngx_reap == 0) {
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if (delay < 15000) {
delay *= 2;
}
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"msleep %d", delay);
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ngx_msleep(delay);
ngx_gettimeofday(&tv);
ngx_time_update(tv.tv_sec);
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"wake up");
}
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if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
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}
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if (ngx_reap) {
ngx_reap = 0;
live = 0;
for (i = 0; i < ngx_last_process; i++) {
if (ngx_processes[i].exiting
&& !ngx_processes[i].exited)
{
live = 1;
continue;
}
if (i != --ngx_last_process) {
ngx_processes[i--] =
ngx_processes[ngx_last_process];
}
}
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if (live == 0) {
if (ngx_process == NGX_PROCESS_QUITING) {
if (ngx_delete_file(ctx->pid.name.data)
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== NGX_FILE_ERROR)
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{
ngx_log_error(NGX_LOG_ALERT, cycle->log,
ngx_errno,
ngx_delete_file_n
" \"%s\" failed",
ctx->pid.name.data);
}
} else { /* NGX_PROCESS_PAUSED */
ngx_pause = 0;
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}
ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exit");
exit(0);
}
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}
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}
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if (ngx_terminate) {
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if (delay > 10000) {
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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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ngx_process = NGX_PROCESS_QUITING;
}
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if (ngx_quit) {
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signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
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ngx_process = NGX_PROCESS_QUITING;
}
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if (ngx_pause) {
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signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
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ngx_process = NGX_PROCESS_PAUSED;
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}
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if (ngx_reap) {
ngx_reap = 0;
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ngx_respawn_processes(cycle);
}
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if (ngx_change_binary) {
ngx_change_binary = 0;
ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
"changing binary");
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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, "reconfiguring");
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}
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if (ngx_reopen) {
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signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
"reopening logs");
ngx_reopen_files(cycle);
ngx_reopen = 0;
}
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if (signo) {
if (first) {
for (i = 0; i < ngx_last_process; i++) {
if (!ngx_processes[i].detached) {
ngx_processes[i].signal = 1;
}
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}
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first = 0;
delay = 125;
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}
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ngx_signal_processes(cycle, signo);
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}
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if (ngx_reconfigure) {
break;
}
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}
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if (ngx_process == NGX_PROCESS_PAUSED) {
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ngx_process = NGX_PROCESS_MASTER;
} else {
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
ngx_cycle = cycle;
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}
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ngx_reconfigure = 0;
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break;
}
}
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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;
ngx_listening_t *ls;
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ngx_process = NGX_PROCESS_WORKER;
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ngx_last_process = 0;
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if (user) {
if (setuid(user) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setuid() failed");
/* fatal */
exit(1);
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}
}
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sigemptyset(&set);
if (sigprocmask(SIG_SETMASK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
}
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ngx_init_temp_number();
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/*
* 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;
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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) {
if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) {
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/* fatal */
exit(1);
}
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}
}
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/* TODO: threads: start ngx_worker_thread_cycle() */
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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->log);
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if (ngx_terminate) {
ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
exit(0);
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}
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if (ngx_quit) {
ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
"gracefully shutdowning");
break;
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}
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if (ngx_reopen) {
ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs");
ngx_reopen_files(cycle);
ngx_reopen = 0;
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}
}
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ngx_close_listening_sockets(cycle);
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for ( ;; ) {
if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) {
ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
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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}
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}
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static ngx_int_t ngx_add_inherited_sockets(ngx_cycle_t *cycle, char **envp)
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{
char *p, *v;
ngx_socket_t s;
ngx_listening_t *ls;
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for ( /* void */ ; *envp; envp++) {
if (ngx_strncmp(*envp, NGINX_VAR, NGINX_VAR_LEN) != 0) {
continue;
}
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ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
"using inherited sockets from \"%s\"", *envp);
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ngx_init_array(cycle->listening, cycle->pool,
10, sizeof(ngx_listening_t), NGX_ERROR);
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for (p = *envp + NGINX_VAR_LEN, v = p; *p; p++) {
if (*p == ':' || *p == ';') {
s = ngx_atoi(v, p - v);
if (s == NGX_ERROR) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
"invalid socket number \"%s\" "
"in NGINX enviroment variable, "
"ignoring the rest of the variable", v);
break;
}
v = p + 1;
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if (!(ls = ngx_push_array(&cycle->listening))) {
return NGX_ERROR;
}
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ls->fd = s;
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}
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}
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ngx_inherited = 1;
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return ngx_set_inherited_sockets(cycle);
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}
return NGX_OK;
}
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static void ngx_exec_new_binary(ngx_cycle_t *cycle, char *const *argv)
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{
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char *env[2], *var, *p;
ngx_int_t i;
ngx_exec_ctx_t ctx;
ngx_listening_t *ls;
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ctx.path = argv[0];
ctx.name = "new binary process";
ctx.argv = argv;
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var = ngx_alloc(NGINX_VAR_LEN
+ cycle->listening.nelts * (NGX_INT32_LEN + 1) + 1,
cycle->log);
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p = ngx_cpymem(var, NGINX_VAR, NGINX_VAR_LEN);
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ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++) {
p += ngx_snprintf(p, NGX_INT32_LEN + 2, "%u;", ls[i].fd);
}
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env[0] = var;
env[1] = NULL;
ctx.envp = (char *const *) &env;
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ngx_exec(cycle, &ctx);
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ngx_free(var);
}
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static ngx_int_t ngx_core_module_init(ngx_cycle_t *cycle)
{
ngx_core_conf_t *ccf;
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/*
* ngx_core_module has a special init procedure: it is called by
* ngx_init_cycle() before the configuration file parsing to create
* ngx_core_module configuration and to set its default parameters
*/
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if (((void **)(cycle->conf_ctx))[ngx_core_module.index] != NULL) {
return NGX_OK;
}
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if (!(ccf = ngx_pcalloc(cycle->pool, sizeof(ngx_core_conf_t)))) {
return NGX_ERROR;
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}
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/* set by pcalloc()
*
* ccf->pid = NULL;
*/
ccf->daemon = -1;
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ccf->master = -1;
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((void **)(cycle->conf_ctx))[ngx_core_module.index] = ccf;
return NGX_OK;
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}