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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
ngx_int_t ngx_ncpu;
ngx_int_t ngx_max_sockets;
ngx_uint_t ngx_inherited_nonblocking;
ngx_uint_t ngx_tcp_nodelay_and_tcp_nopush;
struct rlimit rlmt;
#if (NGX_POSIX_IO)
ngx_os_io_t ngx_os_io = {
ngx_unix_recv,
ngx_readv_chain,
NULL,
ngx_writev_chain,
0
};
int ngx_os_init(ngx_log_t *log)
{
return ngx_posix_init(log);
}
void ngx_os_status(ngx_log_t *log)
{
ngx_posix_status(log);
}
#endif
void ngx_signal_handler(int signo);
typedef struct {
int signo;
char *signame;
void (*handler)(int signo);
} ngx_signal_t;
ngx_signal_t signals[] = {
{ ngx_signal_value(NGX_RECONFIGURE_SIGNAL),
"SIG" ngx_value(NGX_RECONFIGURE_SIGNAL),
ngx_signal_handler },
{ ngx_signal_value(NGX_REOPEN_SIGNAL),
"SIG" ngx_value(NGX_REOPEN_SIGNAL),
ngx_signal_handler },
{ ngx_signal_value(NGX_NOACCEPT_SIGNAL),
"SIG" ngx_value(NGX_NOACCEPT_SIGNAL),
ngx_signal_handler },
{ ngx_signal_value(NGX_TERMINATE_SIGNAL),
"SIG" ngx_value(NGX_TERMINATE_SIGNAL),
ngx_signal_handler },
{ ngx_signal_value(NGX_SHUTDOWN_SIGNAL),
"SIG" ngx_value(NGX_SHUTDOWN_SIGNAL),
ngx_signal_handler },
{ ngx_signal_value(NGX_CHANGEBIN_SIGNAL),
"SIG" ngx_value(NGX_CHANGEBIN_SIGNAL),
ngx_signal_handler },
{ SIGALRM, "SIGALRM", ngx_signal_handler },
{ SIGINT, "SIGINT", ngx_signal_handler },
{ SIGIO, "SIGIO", ngx_signal_handler },
{ SIGCHLD, "SIGCHLD", ngx_signal_handler },
{ SIGPIPE, "SIGPIPE, SIG_IGN", SIG_IGN },
{ 0, NULL, NULL }
};
ngx_int_t ngx_posix_init(ngx_log_t *log)
{
ngx_signal_t *sig;
struct sigaction sa;
ngx_pagesize = getpagesize();
if (ngx_ncpu == 0) {
ngx_ncpu = 1;
}
for (sig = signals; sig->signo != 0; sig++) {
ngx_memzero(&sa, sizeof(struct sigaction));
sa.sa_handler = sig->handler;
sigemptyset(&sa.sa_mask);
if (sigaction(sig->signo, &sa, NULL) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
"sigaction(%s) failed", sig->signame);
return NGX_ERROR;
}
}
if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) {
ngx_log_error(NGX_LOG_ALERT, log, errno,
"getrlimit(RLIMIT_NOFILE) failed)");
return NGX_ERROR;
}
ngx_max_sockets = rlmt.rlim_cur;
#if (NGX_HAVE_INHERITED_NONBLOCK)
ngx_inherited_nonblocking = 1;
#else
ngx_inherited_nonblocking = 0;
#endif
return NGX_OK;
}
void ngx_posix_status(ngx_log_t *log)
{
ngx_log_error(NGX_LOG_INFO, log, 0,
"getrlimit(RLIMIT_NOFILE): %r:%r",
rlmt.rlim_cur, rlmt.rlim_max);
}
void ngx_signal_handler(int signo)
{
char *action;
struct timeval tv;
ngx_int_t ignore;
ngx_err_t err;
ngx_signal_t *sig;
ignore = 0;
err = ngx_errno;
for (sig = signals; sig->signo != 0; sig++) {
if (sig->signo == signo) {
break;
}
}
ngx_gettimeofday(&tv);
ngx_time_update(tv.tv_sec);
action = "";
switch (ngx_process) {
case NGX_PROCESS_MASTER:
case NGX_PROCESS_SINGLE:
switch (signo) {
case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
ngx_quit = 1;
action = ", shutting down";
break;
case ngx_signal_value(NGX_TERMINATE_SIGNAL):
case SIGINT:
ngx_terminate = 1;
action = ", exiting";
break;
case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
ngx_noaccept = 1;
action = ", stop the accepting connections";
break;
case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
ngx_reconfigure = 1;
action = ", reconfiguring";
break;
case ngx_signal_value(NGX_REOPEN_SIGNAL):
ngx_reopen = 1;
action = ", reopening logs";
break;
case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
if (getppid() > 1 || ngx_new_binary > 0) {
/*
* Ignore the signal in the new binary if its parent is
* not the init process, i.e. the old binary's process
* is still running. Or ingore the signal in the old binary's
* process if the new binary's process is already running.
*/
action = ", ignoring";
ignore = 1;
break;
}
ngx_change_binary = 1;
action = ", changing binary";
break;
case SIGALRM:
if (!ngx_terminate) {
ngx_timer = 1;
action = ", shutting down old worker processes";
}
break;
case SIGIO:
ngx_sigio = 1;
break;
case SIGCHLD:
ngx_reap = 1;
break;
}
break;
case NGX_PROCESS_WORKER:
switch (signo) {
case ngx_signal_value(NGX_NOACCEPT_SIGNAL):
ngx_debug_quit = 1;
case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
ngx_quit = 1;
action = ", shutting down";
break;
case ngx_signal_value(NGX_TERMINATE_SIGNAL):
case SIGINT:
ngx_terminate = 1;
action = ", exiting";
break;
case ngx_signal_value(NGX_REOPEN_SIGNAL):
ngx_reopen = 1;
action = ", reopening logs";
break;
case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
case ngx_signal_value(NGX_CHANGEBIN_SIGNAL):
case SIGIO:
action = ", ignoring";
break;
}
break;
}
ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
"signal %d (%s) received%s", signo, sig->signame, action);
if (ignore) {
ngx_log_error(NGX_LOG_CRIT, ngx_cycle->log, 0,
"the changing binary signal is ignored: "
"you should shutdown or terminate "
"before either old or new binary's process");
}
if (signo == SIGCHLD) {
ngx_process_get_status();
}
ngx_set_errno(err);
}
int ngx_posix_post_conf_init(ngx_log_t *log)
{
ngx_fd_t pp[2];
if (pipe(pp) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "pipe() failed");
return NGX_ERROR;
}
if (dup2(pp[1], STDERR_FILENO) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, errno, "dup2(STDERR) failed");
return NGX_ERROR;
}
if (pp[1] > STDERR_FILENO) {
if (close(pp[1]) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, errno, "close() failed");
return NGX_ERROR;
}
}
return NGX_OK;
}
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