/* * Copyright (C) Igor Sysoev */ #include #include #include #include typedef struct { int signo; char *signame; void (*handler)(int signo); } ngx_signal_t; static void ngx_execute_proc(ngx_cycle_t *cycle, void *data); static void ngx_signal_handler(int signo); static void ngx_process_get_status(void); 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_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_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_INVALID_PID; } } 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_INVALID_PID; } 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_INVALID_PID; } 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_INVALID_PID; } 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_INVALID_PID; } 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_INVALID_PID; } 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_INVALID_PID; } 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_INVALID_PID; } 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_INVALID_PID; 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); } ngx_int_t ngx_init_signals(ngx_log_t *log) { ngx_signal_t *sig; struct sigaction sa; 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; } } return NGX_OK; } void ngx_signal_handler(int signo) { char *action; 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_time_update(0, 0); 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 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 ignore 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: 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); } static void ngx_process_get_status(void) { 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"); return; } #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(void) { 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: ngx_abort(); } }