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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_channel.h>
static void ngx_execute_proc(ngx_cycle_t *cycle, void *data);
int ngx_argc;
char **ngx_argv;
char **ngx_os_argv;
ngx_int_t ngx_process_slot;
ngx_socket_t ngx_channel;
ngx_int_t ngx_last_process;
ngx_process_t ngx_processes[NGX_MAX_PROCESSES];
ngx_pid_t ngx_spawn_process(ngx_cycle_t *cycle,
ngx_spawn_proc_pt proc, void *data,
char *name, ngx_int_t respawn)
{
u_long on;
ngx_pid_t pid;
ngx_int_t s;
if (respawn >= 0) {
s = respawn;
} else {
for (s = 0; s < ngx_last_process; s++) {
if (ngx_processes[s].pid == -1) {
break;
}
}
if (s == NGX_MAX_PROCESSES) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"no more than %d processes can be spawned",
NGX_MAX_PROCESSES);
return NGX_ERROR;
}
}
if (respawn != NGX_PROCESS_DETACHED) {
/* Solaris 9 still has no AF_LOCAL */
if (socketpair(AF_UNIX, SOCK_STREAM, 0, ngx_processes[s].channel) == -1)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"socketpair() failed while spawning \"%s\"", name);
return NGX_ERROR;
}
ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"channel %d:%d",
ngx_processes[s].channel[0],
ngx_processes[s].channel[1]);
if (ngx_nonblocking(ngx_processes[s].channel[0]) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
ngx_nonblocking_n " failed while spawning \"%s\"",
name);
ngx_close_channel(ngx_processes[s].channel, cycle->log);
return NGX_ERROR;
}
if (ngx_nonblocking(ngx_processes[s].channel[1]) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
ngx_nonblocking_n " failed while spawning \"%s\"",
name);
ngx_close_channel(ngx_processes[s].channel, cycle->log);
return NGX_ERROR;
}
on = 1;
if (ioctl(ngx_processes[s].channel[0], FIOASYNC, &on) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"ioctl(FIOASYNC) failed while spawning \"%s\"", name);
ngx_close_channel(ngx_processes[s].channel, cycle->log);
return NGX_ERROR;
}
if (fcntl(ngx_processes[s].channel[0], F_SETOWN, ngx_pid) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"fcntl(F_SETOWN) failed while spawning \"%s\"", name);
ngx_close_channel(ngx_processes[s].channel, cycle->log);
return NGX_ERROR;
}
if (fcntl(ngx_processes[s].channel[0], F_SETFD, FD_CLOEXEC) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
name);
ngx_close_channel(ngx_processes[s].channel, cycle->log);
return NGX_ERROR;
}
if (fcntl(ngx_processes[s].channel[1], F_SETFD, FD_CLOEXEC) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"fcntl(FD_CLOEXEC) failed while spawning \"%s\"",
name);
ngx_close_channel(ngx_processes[s].channel, cycle->log);
return NGX_ERROR;
}
ngx_channel = ngx_processes[s].channel[1];
} else {
ngx_processes[s].channel[0] = -1;
ngx_processes[s].channel[1] = -1;
}
ngx_process_slot = s;
pid = fork();
switch (pid) {
case -1:
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"fork() failed while spawning \"%s\"", name);
ngx_close_channel(ngx_processes[s].channel, cycle->log);
return NGX_ERROR;
case 0:
ngx_pid = ngx_getpid();
proc(cycle, data);
break;
default:
break;
}
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "start %s %P", name, pid);
ngx_processes[s].pid = pid;
ngx_processes[s].exited = 0;
if (respawn >= 0) {
return pid;
}
ngx_processes[s].proc = proc;
ngx_processes[s].data = data;
ngx_processes[s].name = name;
ngx_processes[s].exiting = 0;
switch (respawn) {
case NGX_PROCESS_RESPAWN:
ngx_processes[s].respawn = 1;
ngx_processes[s].just_respawn = 0;
ngx_processes[s].detached = 0;
break;
case NGX_PROCESS_JUST_RESPAWN:
ngx_processes[s].respawn = 1;
ngx_processes[s].just_respawn = 1;
ngx_processes[s].detached = 0;
break;
case NGX_PROCESS_DETACHED:
ngx_processes[s].respawn = 0;
ngx_processes[s].just_respawn = 0;
ngx_processes[s].detached = 1;
break;
}
if (s == ngx_last_process) {
ngx_last_process++;
}
return pid;
}
ngx_pid_t ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx)
{
return ngx_spawn_process(cycle, ngx_execute_proc, ctx, ctx->name,
NGX_PROCESS_DETACHED);
}
static void ngx_execute_proc(ngx_cycle_t *cycle, void *data)
{
ngx_exec_ctx_t *ctx = data;
if (execve(ctx->path, ctx->argv, ctx->envp) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"execve() failed while executing %s \"%s\"",
ctx->name, ctx->path);
}
exit(1);
}
void ngx_process_get_status()
{
int status;
char *process;
ngx_pid_t pid;
ngx_err_t err;
ngx_int_t i;
ngx_uint_t one;
one = 0;
for ( ;; ) {
pid = waitpid(-1, &status, WNOHANG);
if (pid == 0) {
return;
}
if (pid == -1) {
err = ngx_errno;
if (err == NGX_EINTR) {
continue;
}
if (err == NGX_ECHILD && one) {
return;
}
#if (NGX_SOLARIS)
/*
* Solaris always calls the signal handler for each exited process
* despite waitpid() may be already called for this process
*/
if (err == NGX_ECHILD) {
ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, errno,
"waitpid() failed");
}
#endif
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, errno,
"waitpid() failed");
return;
}
if (ngx_accept_mutex_ptr) {
/*
* unlock the accept mutex if the abnormally exited process
* held it
*/
ngx_atomic_cmp_set(ngx_accept_mutex_ptr, pid, 0);
}
one = 1;
process = "unknown process";
for (i = 0; i < ngx_last_process; i++) {
if (ngx_processes[i].pid == pid) {
ngx_processes[i].status = status;
ngx_processes[i].exited = 1;
process = ngx_processes[i].name;
break;
}
}
if (WTERMSIG(status)) {
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
"%s %P exited on signal %d%s",
process, pid, WTERMSIG(status),
WCOREDUMP(status) ? " (core dumped)" : "");
} else {
ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
"%s %P exited with code %d",
process, pid, WEXITSTATUS(status));
}
if (WEXITSTATUS(status) == 2 && ngx_processes[i].respawn) {
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
"%s %P exited with fatal code %d and could not respawn",
process, pid, WEXITSTATUS(status));
ngx_processes[i].respawn = 0;
}
}
}
void ngx_debug_point()
{
ngx_core_conf_t *ccf;
ccf = (ngx_core_conf_t *) ngx_get_conf(ngx_cycle->conf_ctx,
ngx_core_module);
switch (ccf->debug_points) {
case NGX_DEBUG_POINTS_STOP:
raise(SIGSTOP);
break;
case NGX_DEBUG_POINTS_ABORT:
abort();
}
}
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