/* Somewhat primitive version of init Copyright (C) 1993, 1994, 1995, 1996 Free Software Foundation, Inc. This file is part of the GNU Hurd. The GNU Hurd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. The GNU Hurd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with the GNU Hurd; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ /* Written by Michael I. Bushnell and Roland McGrath. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "startup_notify_U.h" #include "startup_reply_U.h" #include "startup_S.h" #include "notify_S.h" #include "msg_S.h" /* host_reboot flags for when we crash. */ #define CRASH_FLAGS RB_AUTOBOOT #define BOOT(flags) ((flags & RB_HALT) ? "halt" : "reboot") #define _PATH_RUNCOM "/etc/rc" #define _PATH_LOGIN "/bin/login" /* Current state of the system. */ enum { INITIAL, SINGLE, RUNCOM, MULTI, } system_state; /* This structure keeps track of each notified task. */ struct ntfy_task { mach_port_t notify_port; struct ntfy_task *next; char *name; }; /* This structure keeps track of each registered essential task. */ struct ess_task { struct ess_task *next; task_t task_port; char *name; }; /* These are linked lists of all of the registered items. */ struct ess_task *ess_tasks; struct ntfy_task *ntfy_tasks; /* Our receive right */ mach_port_t startup; /* Ports to the kernel */ mach_port_t host_priv, device_master; /* Args to bootstrap, expressed as flags */ int bootstrap_args; /* Set if something determines we should no longer pass the `autoboot' flag to _PATH_RUNCOM. */ int do_fastboot; /* Stored information for returning proc and auth startup messages. */ mach_port_t procreply, authreply; mach_msg_type_name_t procreplytype, authreplytype; /* Our ports to auth and proc. */ mach_port_t authserver; mach_port_t procserver; /* Our bootstrap port, on which we call fsys_getpriv and fsys_init. */ mach_port_t bootport; /* Set iff we are a `fake' bootstrap. */ int fakeboot; /* The tasks of auth and proc and the bootstrap filesystem. */ task_t authtask, proctask, fstask; char *init_version = "0.0"; mach_port_t default_ports[INIT_PORT_MAX]; mach_port_t default_dtable[3]; int default_ints[INIT_INT_MAX]; char **global_argv; pid_t shell_pid; /* PID of single-user shell. */ pid_t rc_pid; /* PID of rc script */ pid_t session_pid; /* PID of sole multi-user login */ /* Read a string from stdin into BUF. */ static int getstring (char *buf, size_t bufsize) { if (fgets (buf, bufsize, stdin) != NULL && buf[0] != '\0') { size_t len = strlen (buf); if (buf[len - 1] == '\n' || buf[len - 1] == '\r') buf[len - 1] = '\0'; return 1; } return 0; } /* Reboot the microkernel. */ void reboot_mach (int flags) { if (fakeboot) { printf ("%s: Would %s Mach with flags %#x\n", program_invocation_short_name, BOOT (flags), flags); fflush (stdout); exit (1); } else { printf ("%s: %sing Mach (flags %#x)...\n", program_invocation_short_name, BOOT (flags), flags); fflush (stdout); sleep (5); while ((errno = host_reboot (host_priv, flags))) error (0, errno, "reboot"); for (;;); } } /* Reboot the microkernel, specifying that this is a crash. */ void crash_mach (void) { reboot_mach (CRASH_FLAGS); } /* Notify all tasks that have requested shutdown notifications */ void notify_shutdown (char *msg) { struct ntfy_task *n; for (n = ntfy_tasks; n != NULL; n = n->next) { error_t err; printf ("%s: notifying %s of %s...", program_invocation_short_name, n->name, msg); fflush (stdout); err = startup_dosync (n->notify_port, 60000); /* 1 minute to reply */ if (err == MACH_SEND_INVALID_DEST) puts ("(no longer present)"); else if (err) puts (strerror (err)); else puts ("done"); fflush (stdout); } } /* Reboot the Hurd. */ void reboot_system (int flags) { notify_shutdown ("shutdown"); if (fakeboot) { pid_t *pp; u_int npids = 0; error_t err; int ind; err = proc_getallpids (procserver, &pp, &npids); if (err == MACH_SEND_INVALID_DEST) { procbad: /* The procserver must have died. Give up. */ error (0, 0, "Can't simulate crash; proc has died"); reboot_mach (flags); } for (ind = 0; ind < npids; ind++) { task_t task; err = proc_pid2task (procserver, pp[ind], &task); if (err == MACH_SEND_INVALID_DEST) goto procbad; else if (err) { error (0, err, "Getting task for pid %d", pp[ind]); continue; } /* Postpone self so we can finish; postpone proc so that we can finish. */ if (task != mach_task_self () && task != proctask) { struct procinfo *pi = 0; u_int pisize = 0; char *noise; unsigned noise_len; err = proc_getprocinfo (procserver, pp[ind], 0, (int **)&pi, &pisize, &noise,&noise_len); if (err == MACH_SEND_INVALID_DEST) goto procbad; if (err) { error (0, err, "Getting procinfo for pid %d", pp[ind]); continue; } if (!(pi->state & PI_NOPARENT)) { printf ("%s: Killing pid %d\n", program_invocation_short_name, pp[ind]); fflush (stdout); task_terminate (task); } if (noise_len > 0) vm_deallocate (mach_task_self (), (vm_address_t)noise, noise_len); } } printf ("%s: Killing proc server\n", program_invocation_short_name); fflush (stdout); task_terminate (proctask); printf ("%s: Exiting", program_invocation_short_name); fflush (stdout); } reboot_mach (flags); } /* Reboot the Hurd, specifying that this is a crash. */ void crash_system (void) { reboot_system (CRASH_FLAGS); } /* Run SERVER, giving it INIT_PORT_MAX initial ports from PORTS. Set TASK to be the task port of the new image. */ void run (char *server, mach_port_t *ports, task_t *task) { char buf[BUFSIZ]; char *prog = server; if (bootstrap_args & RB_INITNAME) { printf ("Server file name (default %s): ", server); if (getstring (buf, sizeof (buf))) prog = buf; } while (1) { file_t file; file = file_name_lookup (prog, O_EXEC, 0); if (file == MACH_PORT_NULL) error (0, errno, "%s", prog); else { char *progname; task_create (mach_task_self (), 0, task); if (bootstrap_args & RB_KDB) { printf ("Pausing for %s\n", prog); getchar (); } progname = strrchr (prog, '/'); if (progname) ++progname; else progname = prog; errno = file_exec (file, *task, 0, progname, strlen (progname) + 1, /* Args. */ "", 1, /* No env. */ default_dtable, MACH_MSG_TYPE_COPY_SEND, 3, ports, MACH_MSG_TYPE_COPY_SEND, INIT_PORT_MAX, default_ints, INIT_INT_MAX, NULL, 0, NULL, 0); if (!errno) break; error (0, errno, "%s", prog); } printf ("File name for server %s (or nothing to reboot): ", server); if (getstring (buf, sizeof (buf))) prog = buf; else crash_system (); } #if 0 printf ("started %s\n", prog); fflush (stdout); #endif } /* Run FILENAME as root with ARGS as its argv (length ARGLEN). Return the task that we started. If CTTY is set, then make that the controlling terminal of the new process and put it in its own login collection. */ task_t run_for_real (char *filename, char *args, int arglen, mach_port_t ctty) { file_t file; error_t err; task_t task; char *progname; #if 0 char buf[512]; do { printf ("File name [%s]: ", filename); if (getstring (buf, sizeof (buf)) && *buf) filename = buf; file = file_name_lookup (filename, O_EXEC, 0); if (!file) error (0, errno, "%s", filename); } while (!file); #else file = file_name_lookup (filename, O_EXEC, 0); if (!file) { error (0, errno, "%s", filename); return MACH_PORT_NULL; } #endif task_create (mach_task_self (), 0, &task); proc_child (procserver, task); proc_task2proc (procserver, task, &default_ports[INIT_PORT_PROC]); proc_mark_exec (default_ports[INIT_PORT_PROC]); proc_setsid (default_ports[INIT_PORT_PROC]); if (ctty != MACH_PORT_NULL) { int pid; term_getctty (ctty, &default_ports[INIT_PORT_CTTYID]); proc_task2pid (procserver, task, &pid); io_mod_owner (ctty, -pid); proc_make_login_coll (default_ports[INIT_PORT_PROC]); } if (bootstrap_args & RB_KDB) { printf ("Pausing for %s\n", filename); getchar (); } progname = strrchr (filename, '/'); if (progname) ++progname; else progname = filename; err = file_exec (file, task, 0, args, arglen, NULL, 0, /* No env. */ default_dtable, MACH_MSG_TYPE_COPY_SEND, 3, default_ports, MACH_MSG_TYPE_COPY_SEND, INIT_PORT_MAX, default_ints, INIT_INT_MAX, NULL, 0, NULL, 0); mach_port_deallocate (mach_task_self (), default_ports[INIT_PORT_PROC]); if (ctty != MACH_PORT_NULL) { mach_port_deallocate (mach_task_self (), default_ports[INIT_PORT_CTTYID]); default_ports[INIT_PORT_CTTYID] = MACH_PORT_NULL; } mach_port_deallocate (mach_task_self (), file); if (err) { error (0, err, "Cannot execute %s", filename); return MACH_PORT_NULL; } return task; } static int demuxer (mach_msg_header_t *inp, mach_msg_header_t *outp) { extern int notify_server (), startup_server (), msg_server (); return (notify_server (inp, outp) || msg_server (inp, outp) || startup_server (inp, outp)); } int main (int argc, char **argv, char **envp) { volatile int err; int i; mach_port_t consdev; global_argv = argv; system_state = INITIAL; /* Parse the arguments */ bootstrap_args = 0; if (argc >= 2) { if (index (argv[1], 'q')) bootstrap_args |= RB_ASKNAME; if (index (argv[1], 's')) bootstrap_args |= RB_SINGLE; if (index (argv[1], 'd')) bootstrap_args |= RB_KDB; if (index (argv[1], 'n')) bootstrap_args |= RB_INITNAME; if (index (argv[1], 'f')) fakeboot = 1; } /* Fetch a port to the bootstrap filesystem, the host priv and master device ports, and the console. */ if (task_get_bootstrap_port (mach_task_self (), &bootport) || fsys_getpriv (bootport, &host_priv, &device_master, &fstask) || device_open (device_master, D_WRITE, "console", &consdev)) crash_mach (); wire_task_self (); /* Clear our bootstrap port so our children don't inherit it. */ task_set_bootstrap_port (mach_task_self (), MACH_PORT_NULL); stderr = stdout = mach_open_devstream (consdev, "w"); stdin = mach_open_devstream (consdev, "r"); if (stdout == NULL || stdin == NULL) crash_mach (); setbuf (stdout, NULL); /* At this point we can use assert to check for errors. */ err = mach_port_allocate (mach_task_self (), MACH_PORT_RIGHT_RECEIVE, &startup); assert_perror (err); err = mach_port_insert_right (mach_task_self (), startup, startup, MACH_MSG_TYPE_MAKE_SEND); assert_perror (err); /* Set up the set of ports we will pass to the programs we exec. */ for (i = 0; i < INIT_PORT_MAX; i++) switch (i) { case INIT_PORT_CRDIR: default_ports[i] = getcrdir (); break; case INIT_PORT_CWDIR: default_ports[i] = getcwdir (); break; default: default_ports[i] = MACH_PORT_NULL; break; } default_dtable[0] = getdport (0); default_dtable[1] = getdport (1); default_dtable[2] = getdport (2); /* All programs we start should ignore job control stop signals. That way Posix.1 B.2.2.2 is satisfied where it says that programs not run under job control shells are protected. */ default_ints[INIT_SIGIGN] = (sigmask (SIGTSTP) | sigmask (SIGTTIN) | sigmask (SIGTTOU)); default_ports[INIT_PORT_BOOTSTRAP] = startup; run ("/hurd/proc", default_ports, &proctask); printf (" proc"); fflush (stdout); run ("/hurd/auth", default_ports, &authtask); printf (" auth"); fflush (stdout); default_ports[INIT_PORT_BOOTSTRAP] = MACH_PORT_NULL; /* Wait for messages. When both auth and proc have started, we run launch_system which does the rest of the boot. */ while (1) { err = mach_msg_server (demuxer, 0, startup); assert_perror (err); } } void launch_core_servers (void) { mach_port_t old; mach_port_t authproc, fsproc; /* Reply to the proc and auth servers. */ startup_procinit_reply (procreply, procreplytype, 0, mach_task_self (), authserver, host_priv, MACH_MSG_TYPE_COPY_SEND, device_master, MACH_MSG_TYPE_COPY_SEND); if (!fakeboot) { mach_port_deallocate (mach_task_self (), device_master); device_master = 0; } proc_mark_exec (procserver); /* Declare that the filesystem and auth are our children. */ proc_child (procserver, fstask); proc_child (procserver, authtask); proc_task2proc (procserver, authtask, &authproc); proc_mark_exec (authproc); startup_authinit_reply (authreply, authreplytype, 0, authproc, MACH_MSG_TYPE_MOVE_SEND); /* Give the library our auth and proc server ports. */ _hurd_port_set (&_hurd_ports[INIT_PORT_AUTH], authserver); _hurd_port_set (&_hurd_ports[INIT_PORT_PROC], procserver); /* Do NOT run _hurd_proc_init! That will start signals, which we do not want. We listen to our own message port. Tell the proc server where our args and environment are. */ proc_set_arg_locations (procserver, (vm_address_t) global_argv, (vm_address_t) environ); default_ports[INIT_PORT_AUTH] = authserver; proc_register_version (procserver, host_priv, "init", HURD_RELEASE, init_version); /* Get the bootstrap filesystem's proc server port. We must do this before calling proc_setmsgport below. */ proc_task2proc (procserver, fstask, &fsproc); proc_mark_exec (fsproc); #if 0 printf ("Init has completed.\n"); fflush (stdout); #endif printf (".\n"); fflush (stdout); /* Tell the proc server our msgport. Be sure to do this after we are all done making requests of proc. Once we have done this RPC, proc assumes it can send us requests, so we cannot block on proc again before accepting more RPC requests! However, we must do this before calling fsys_init, because fsys_init blocks on exec_init, and exec_init will block waiting on our message port. */ proc_setmsgport (procserver, startup, &old); if (old != MACH_PORT_NULL) mach_port_deallocate (mach_task_self (), old); /* Give the bootstrap FS its proc and auth ports. */ errno = fsys_init (bootport, fsproc, MACH_MSG_TYPE_MOVE_SEND, authserver); if (errno) error (0, errno, "fsys_init"); /* Not necessarily fatal. */ } /* Set up the initial value of the standard exec data. */ void init_stdarrays () { auth_t nullauth; mach_port_t pt; mach_port_t ref; mach_port_t *std_port_array; int *std_int_array; std_port_array = alloca (sizeof (mach_port_t) * INIT_PORT_MAX); std_int_array = alloca (sizeof (int) * INIT_INT_MAX); bzero (std_port_array, sizeof (mach_port_t) * INIT_PORT_MAX); bzero (std_int_array, sizeof (int) * INIT_INT_MAX); __USEPORT (AUTH, auth_makeauth (port, 0, MACH_MSG_TYPE_COPY_SEND, 0, 0, 0, 0, 0, 0, 0, 0, 0, &nullauth)); pt = getcwdir (); ref = mach_reply_port (); io_reauthenticate (pt, ref, MACH_MSG_TYPE_MAKE_SEND); auth_user_authenticate (nullauth, ref, MACH_MSG_TYPE_MAKE_SEND, &std_port_array[INIT_PORT_CWDIR]); mach_port_destroy (mach_task_self (), ref); mach_port_deallocate (mach_task_self (), pt); pt = getcrdir (); ref = mach_reply_port (); io_reauthenticate (pt, ref, MACH_MSG_TYPE_MAKE_SEND); auth_user_authenticate (nullauth, ref, MACH_MSG_TYPE_MAKE_SEND, &std_port_array[INIT_PORT_CRDIR]); mach_port_destroy (mach_task_self (), ref); mach_port_deallocate (mach_task_self (), pt); std_port_array[INIT_PORT_AUTH] = nullauth; std_int_array[INIT_UMASK] = CMASK; __USEPORT (PROC, proc_setexecdata (port, std_port_array, MACH_MSG_TYPE_MOVE_SEND, INIT_PORT_MAX, std_int_array, INIT_INT_MAX)); } /* Open /dev/console. If it isn't there, or it isn't a terminal, then create /tmp/console and put the terminal on it. If we get EROFS, in trying to create /tmp/console then as a last resort, put the console on /tmp itself. In any case, after the console has been opened, set it appropriately in default_dtable. Also return a port right for the terminal. */ file_t open_console () { #define TERMINAL_FIRST_TRY "/hurd/term\0/tmp/console\0device\0console" #define TERMINAL_SECOND_TRY "/hurd/term\0/tmp\0device\0console" static char *terminal; int try; mach_port_t term; static char *termname; int fd; struct stat st; error_t err = 0; if (system_state != INITIAL) { term = file_name_lookup (termname, O_RDWR, 0); return term; } termname = _PATH_CONSOLE; term = file_name_lookup (termname, O_RDWR, 0); if (term != MACH_PORT_NULL) { err = io_stat (term, &st); if (err) error (0, err, "%s", termname); } try = 1; if (term == MACH_PORT_NULL || err || st.st_fstype != FSTYPE_TERM) /* Start the terminal server ourselves. */ { mach_port_t control; /* Control port for term translator. */ error_t open_node (int flags, mach_port_t *underlying, mach_msg_type_name_t *underlying_type) { term = file_name_lookup (termname, flags | O_CREAT|O_NOTRANS, 0666); if (term == MACH_PORT_NULL) { error (0, errno, "%s", termname); return errno; } *underlying = term; *underlying_type = MACH_MSG_TYPE_COPY_SEND; return 0; } retry: bootstrap_args |= RB_SINGLE; if (try == 1) { terminal = TERMINAL_FIRST_TRY; try = 2; } else if (try == 2) { terminal = TERMINAL_SECOND_TRY; try = 3; } else goto fail; termname = terminal + strlen (terminal) + 1; /* first arg is name */ /* The callback to start_translator opens TERM as a side effect. */ errno = fshelp_start_translator (open_node, terminal, terminal, sizeof terminal, 3000, &control); if (errno) { error (0, errno, "%s", terminal); goto retry; } errno = file_set_translator (term, 0, FS_TRANS_SET, 0, 0, 0, control, MACH_MSG_TYPE_MOVE_SEND); if (errno) { error (0, errno, "%s", termname); goto retry; } mach_port_deallocate (mach_task_self (), term); /* Now repeat the open. */ term = file_name_lookup (termname, O_RDWR, 0); if (term == MACH_PORT_NULL) { error (0, errno, "%s", termname); goto retry; } errno = io_stat (term, &st); if (errno) { error (0, errno, "%s", termname); term = MACH_PORT_NULL; goto retry; } if (st.st_fstype != FSTYPE_TERM) { error (0, 0, "%s: Not a terminal", termname); term = MACH_PORT_NULL; goto retry; } if (term) error (0, 0, "Using temporary console %s", termname); } fail: /* At this point either TERM is the console or it's null. If it's null, then don't do anything, and our fd's will be copied. Otherwise, open fd's 0, 1, and 2. */ if (term != MACH_PORT_NULL) { fd = openport (term, O_RDWR); if (fd < 0) assert_perror (errno); dup2 (fd, 0); close (fd); dup2 (0, 1); dup2 (0, 2); fclose (stdin); stdin = fdopen (0, "r"); /* Don't reopen our output channel for reliability's sake. */ /* Set ports in init_dtable for programs we start. */ mach_port_deallocate (mach_task_self (), default_dtable[0]); mach_port_deallocate (mach_task_self (), default_dtable[1]); mach_port_deallocate (mach_task_self (), default_dtable[2]); default_dtable[0] = getdport (0); default_dtable[1] = getdport (1); default_dtable[2] = getdport (2); } else error (0, 0, "Cannot open console"); return term; } /* Start the single-user environment. This can only be done when the core servers have fully started. We know that startup_essential_task is the last thing they do before being ready to handle requests, so we start this once all the necessary servers have identified themselves that way. */ void launch_single_user () { char shell[1024]; mach_port_t term, shelltask; printf ("Single-user environment:"); fflush (stdout); term = open_console (); system_state = SINGLE; #if 0 printf ("Shell program [%s]: ", _PATH_BSHELL); if (! getstring (shell, sizeof shell)) #endif strcpy (shell, _PATH_BSHELL); /* The shell needs a real controlling terminal, so set that up here. */ shelltask = run_for_real (shell, shell, strlen (shell) + 1, term); mach_port_deallocate (mach_task_self (), term); if (shelltask != MACH_PORT_NULL) { shell_pid = task2pid (shelltask); mach_port_deallocate (mach_task_self (), shelltask); } printf (" shell.\n"); fflush (stdout); } /* Run /etc/rc as a shell script. */ void process_rc_script () { char *rcargs; size_t rcargslen; mach_port_t term; task_t rctask; if (do_fastboot) { rcargs = malloc (rcargslen = sizeof _PATH_RUNCOM); strcpy (rcargs, _PATH_RUNCOM); } else { rcargslen = asprintf (&rcargs, "%s%c%s", _PATH_RUNCOM, '\0', "autoboot"); rcargslen++; /* final null */ } term = open_console (); system_state = RUNCOM; rctask = run_for_real (rcargs, rcargs, rcargslen, term); mach_port_deallocate (mach_task_self (), term); if (rctask != MACH_PORT_NULL) { rc_pid = task2pid (rctask); mach_port_deallocate (mach_task_self (), rctask); } } /* Start up multi-user state. */ void launch_multi_user () { char *sessionargs; size_t sessionargslen; mach_port_t term; task_t session_task; /* Right now, just run `/bin/login -aNOAUTH_TIMEOUT' */ sessionargslen = asprintf (&sessionargs, "%s%c%s%n", _PATH_LOGIN, '\0', "-aNOAUTH_TIMEOUT"); sessionargslen++; /* final null */ term = open_console (); system_state = MULTI; session_task = run_for_real (sessionargs, sessionargs, sessionargslen, term); mach_port_deallocate (mach_task_self (), term); if (session_task != MACH_PORT_NULL) { session_pid = task2pid (session_task); mach_port_deallocate (mach_task_self (), session_task); } } /* Kill all the outstanding processes with SIGNO. Return 1 if there were no tasks left to kill. */ int kill_everyone (int signo) { pid_t pidbuf[100], *pids = pidbuf; mach_msg_type_number_t i, npids = 100; task_t tk; struct ess_task *es; mach_port_t msg; int didany; int nloops; error_t err; for (nloops = 10; nloops; nloops--) { if (nloops < 9) /* Give it a rest for folks to have a chance to die */ sleep (1); didany = 0; err = proc_getallpids (procserver, &pids, &npids); if (!err) { for (i = 0; i < npids; i++) { if (pids[i] == 1 /* us */ || pids[i] == 2 /* kernel */ || pids[i] == 3 /* default pager for now XXX */) continue; /* See if the task is essential */ err = proc_pid2task (procserver, pids[i], &tk); if (err) continue; for (es = ess_tasks; es; es = es->next) if (tk == es->task_port) { /* Skip this one */ mach_port_deallocate (mach_task_self (), tk); continue; } /* Kill it */ if (signo == SIGKILL) { task_terminate (tk); didany = 1; } else { err = proc_getmsgport (procserver, pids[i], &msg); if (err) { mach_port_deallocate (mach_task_self (), tk); continue; } didany = 1; msg_sig_post (msg, signo, 0, tk); mach_port_deallocate (mach_task_self (), tk); } } } if (pids != pidbuf) vm_deallocate (mach_task_self (), (vm_address_t) pids, npids * sizeof (pid_t)); if (!didany) return 1; } return 0; } /* Kill outstanding multi-user sessions */ void kill_multi_user () { int sigs[3] = {SIGHUP, SIGTERM, SIGKILL}; int stage; /* Notify tasks that they are about to die. */ notify_shutdown ("transition to single-user"); for (stage = 0; stage < 3; stage++) if (kill_everyone (sigs[stage])) break; if (stage == 3) error (0, 0, "warning: some processes wouldn't die; `ps -axlM' advised"); } /* SIGNO has arrived and has been validated. Do whatever work it implies. */ void process_signal (int signo) { switch (signo) { case SIGTERM: if (system_state == MULTI) { /* Drop back to single user. */ kill_multi_user (); launch_single_user (); } break; case SIGHUP: if (system_state == MULTI) { /* Should re-read ttys file here, but it's static and hard-coded into launch_multi_user right now. */ } break; case SIGCHLD: { /* A child died. Find its status. */ int status; pid_t pid = waitpid (WAIT_ANY, &status, WNOHANG); if (pid < 0) error (0, errno, "waitpid"); else if (pid == 0) error (0, 0, "Spurious SIGCHLD"); else if (pid == shell_pid && system_state == SINGLE) { if (WIFSIGNALED (status)) { error (0, 0, "Single-user terminated abnormally (%s), restarting", strsignal (WTERMSIG (status))); launch_single_user (); } else if (WIFSTOPPED (status)) { error (0, 0, "Single-user stopped (%s), killing and restarting", strsignal (WSTOPSIG (status))); kill (shell_pid, SIGKILL); launch_single_user (); } else { do_fastboot = 1; process_rc_script (); } } else if (pid == rc_pid && system_state == RUNCOM) { if (WIFSIGNALED (status)) { error (0, 0, "%s terminated abnormally (%s), going to single user mode", _PATH_RUNCOM, strsignal (WTERMSIG (status))); launch_single_user (); } else if (WIFSTOPPED (status)) { error (0, 0, "%s stopped (%s), killing it and going to single user mode", _PATH_RUNCOM, strsignal (WSTOPSIG (status))); kill (rc_pid, SIGKILL); launch_single_user (); } else if (WEXITSTATUS (status)) launch_single_user (); else launch_multi_user (); } else if (pid == session_pid && system_state == MULTI) /* XXX should handle separate sessions instead of only one... */ launch_multi_user (); #if 0 else error (0, 0, "Random child pid %d died (%d)", pid, status); #endif break; } default: break; } } kern_return_t S_startup_procinit (startup_t server, mach_port_t reply, mach_msg_type_name_t reply_porttype, process_t proc, mach_port_t *startuptask, auth_t *auth, mach_port_t *priv, mach_msg_type_name_t *hostprivtype, mach_port_t *dev, mach_msg_type_name_t *devtype) { if (procserver) /* Only one proc server. */ return EPERM; procserver = proc; procreply = reply; procreplytype = reply_porttype; /* Save the reply port until we get startup_authinit. */ if (authserver) launch_core_servers (); return MIG_NO_REPLY; } /* Called by the auth server when it starts up. */ kern_return_t S_startup_authinit (startup_t server, mach_port_t reply, mach_msg_type_name_t reply_porttype, mach_port_t auth, mach_port_t *proc, mach_msg_type_name_t *proctype) { if (authserver) /* Only one auth server. */ return EPERM; authserver = auth; /* Save the reply port until we get startup_procinit. */ authreply = reply; authreplytype = reply_porttype; if (procserver) launch_core_servers (); return MIG_NO_REPLY; } kern_return_t S_startup_essential_task (mach_port_t server, mach_port_t reply, mach_msg_type_name_t replytype, task_t task, mach_port_t excpt, char *name, mach_port_t credential) { struct ess_task *et; mach_port_t prev; static int authinit, procinit, execinit; if (credential != host_priv) return EPERM; /* Record this task as essential. */ et = malloc (sizeof (struct ess_task)); if (et == NULL) return ENOMEM; et->task_port = task; et->name = strdup (name); if (et->name == NULL) { free (et); return ENOMEM; } et->next = ess_tasks; ess_tasks = et; /* Dead-name notification on the task port will tell us when it dies. */ mach_port_request_notification (mach_task_self (), task, MACH_NOTIFY_DEAD_NAME, 1, startup, MACH_MSG_TYPE_MAKE_SEND_ONCE, &prev); if (prev) mach_port_deallocate (mach_task_self (), prev); #if 0 /* Taking over the exception port will give us a better chance if the task tries to get wedged on a fault. */ task_set_special_port (task, TASK_EXCEPTION_PORT, startup); #endif mach_port_deallocate (mach_task_self (), credential); if (system_state == INITIAL) { if (!strcmp (name, "auth")) authinit = 1; else if (!strcmp (name, "exec")) execinit = 1; else if (!strcmp (name, "proc")) procinit = 1; if (authinit && execinit && procinit) { /* Reply to this RPC, after that everything is ready for real startup to begin. */ startup_essential_task_reply (reply, replytype, 0); init_stdarrays (); if (bootstrap_args & RB_SINGLE) launch_single_user (); else process_rc_script (); return MIG_NO_REPLY; } } return 0; } kern_return_t S_startup_request_notification (mach_port_t server, mach_port_t notify, char *name) { struct ntfy_task *nt; mach_port_t prev; mach_port_request_notification (mach_task_self (), notify, MACH_NOTIFY_DEAD_NAME, 1, startup, MACH_MSG_TYPE_MAKE_SEND_ONCE, &prev); if (prev != MACH_PORT_NULL) mach_port_deallocate (mach_task_self (), prev); /* Note that the ntfy_tasks list is kept in inverse order of the calls; this is important. We need later notification requests to get executed first. */ nt = malloc (sizeof (struct ntfy_task)); nt->notify_port = notify; nt->next = ntfy_tasks; ntfy_tasks = nt; nt->name = malloc (strlen (name) + 1); strcpy (nt->name, name); return 0; } kern_return_t do_mach_notify_dead_name (mach_port_t notify, mach_port_t name) { struct ntfy_task *nt, *pnt; struct ess_task *et; for (et = ess_tasks; et != NULL; et = et->next) if (et->task_port == name) /* An essential task has died. */ { error (0, 0, "Crashing system; essential task %s died", et->name); crash_system (); } for (nt = ntfy_tasks, pnt = NULL; nt != NULL; pnt = nt, nt = nt->next) if (nt->notify_port == name) { /* Someone who wanted to be notified is gone. */ mach_port_deallocate (mach_task_self (), name); if (pnt != NULL) pnt->next = nt->next; else ntfy_tasks = nt->next; free (nt); return 0; } return 0; } kern_return_t S_startup_reboot (mach_port_t server, mach_port_t refpt, int code) { if (refpt != host_priv) return EPERM; reboot_system (code); for (;;); } /* Stubs for unused notification RPCs. */ kern_return_t do_mach_notify_port_destroyed (mach_port_t notify, mach_port_t rights) { return EOPNOTSUPP; } kern_return_t do_mach_notify_send_once (mach_port_t notify) { return EOPNOTSUPP; } kern_return_t do_mach_notify_no_senders (mach_port_t port, mach_port_mscount_t mscount) { return EOPNOTSUPP; } kern_return_t do_mach_notify_port_deleted (mach_port_t notify, mach_port_t name) { return EOPNOTSUPP; } kern_return_t do_mach_notify_msg_accepted (mach_port_t notify, mach_port_t name) { return EOPNOTSUPP; } /* msg server */ kern_return_t S_msg_sig_post_untraced (mach_port_t msgport, mach_port_t reply, mach_msg_type_name_t reply_type, int signo, mach_port_t refport) { if (refport != mach_task_self ()) return EPERM; mach_port_deallocate (mach_task_self (), refport); /* Reply immediately */ msg_sig_post_untraced_reply (reply, reply_type, 0); process_signal (signo); return MIG_NO_REPLY; } kern_return_t S_msg_sig_post (mach_port_t msgport, mach_port_t reply, mach_msg_type_name_t reply_type, int signo, mach_port_t refport) { if (refport != mach_task_self ()) return EPERM; mach_port_deallocate (mach_task_self (), refport); /* Reply immediately */ msg_sig_post_reply (reply, reply_type, 0); process_signal (signo); return MIG_NO_REPLY; } /* For the rest of the msg functions, just call the C library's internal server stubs usually run in the signal thread. */ kern_return_t S_msg_proc_newids (mach_port_t process, mach_port_t task, pid_t ppid, pid_t pgrp, int orphaned) { return _S_msg_proc_newids (process, task, ppid, pgrp, orphaned); } kern_return_t S_msg_add_auth (mach_port_t process, auth_t auth) { return _S_msg_add_auth (process, auth); } kern_return_t S_msg_del_auth (mach_port_t process, mach_port_t task, intarray_t uids, mach_msg_type_number_t uidsCnt, intarray_t gids, mach_msg_type_number_t gidsCnt) { return _S_msg_del_auth (process, task, uids, uidsCnt, gids, gidsCnt); } kern_return_t S_msg_get_init_port (mach_port_t process, mach_port_t refport, int which, mach_port_t *port, mach_msg_type_name_t *portPoly) { return _S_msg_get_init_port (process, refport, which, port, portPoly); } kern_return_t S_msg_set_init_port (mach_port_t process, mach_port_t refport, int which, mach_port_t port) { return _S_msg_set_init_port (process, refport, which, port); } kern_return_t S_msg_get_init_ports (mach_port_t process, mach_port_t refport, portarray_t *ports, mach_msg_type_name_t *portsPoly, mach_msg_type_number_t *portsCnt) { return _S_msg_get_init_ports (process, refport, ports, portsPoly, portsCnt); } kern_return_t S_msg_set_init_ports (mach_port_t process, mach_port_t refport, portarray_t ports, mach_msg_type_number_t portsCnt) { return _S_msg_set_init_ports (process, refport, ports, portsCnt); } kern_return_t S_msg_get_init_int (mach_port_t process, mach_port_t refport, int which, int *value) { return _S_msg_get_init_int (process, refport, which, value); } kern_return_t S_msg_set_init_int (mach_port_t process, mach_port_t refport, int which, int value) { return _S_msg_set_init_int (process, refport, which, value); } kern_return_t S_msg_get_init_ints (mach_port_t process, mach_port_t refport, intarray_t *values, mach_msg_type_number_t *valuesCnt) { return _S_msg_get_init_ints (process, refport, values, valuesCnt); } kern_return_t S_msg_set_init_ints (mach_port_t process, mach_port_t refport, intarray_t values, mach_msg_type_number_t valuesCnt) { return _S_msg_set_init_ints (process, refport, values, valuesCnt); } kern_return_t S_msg_get_dtable (mach_port_t process, mach_port_t refport, portarray_t *dtable, mach_msg_type_name_t *dtablePoly, mach_msg_type_number_t *dtableCnt) { return _S_msg_get_dtable (process, refport, dtable, dtablePoly, dtableCnt); } kern_return_t S_msg_set_dtable (mach_port_t process, mach_port_t refport, portarray_t dtable, mach_msg_type_number_t dtableCnt) { return _S_msg_set_dtable (process, refport, dtable, dtableCnt); } kern_return_t S_msg_get_fd (mach_port_t process, mach_port_t refport, int fd, mach_port_t *port, mach_msg_type_name_t *portPoly) { return _S_msg_get_fd (process, refport, fd, port, portPoly); } kern_return_t S_msg_set_fd (mach_port_t process, mach_port_t refport, int fd, mach_port_t port) { return _S_msg_set_fd (process, refport, fd, port); } kern_return_t S_msg_get_environment (mach_port_t process, data_t *value, mach_msg_type_number_t *valueCnt) { return _S_msg_get_environment (process, value, valueCnt); } kern_return_t S_msg_set_environment (mach_port_t process, mach_port_t refport, data_t value, mach_msg_type_number_t valueCnt) { return _S_msg_set_environment (process, refport, value, valueCnt); } kern_return_t S_msg_get_env_variable (mach_port_t process, string_t variable, data_t *value, mach_msg_type_number_t *valueCnt) { return _S_msg_get_env_variable (process, variable, value, valueCnt); } kern_return_t S_msg_set_env_variable (mach_port_t process, mach_port_t refport, string_t variable, string_t value, boolean_t replace) { return _S_msg_set_env_variable (process, refport, variable, value, replace); } error_t S_msg_describe_ports (mach_port_t process, mach_port_t refport, mach_port_array_t names, mach_msg_type_number_t namesCnt, data_t *descriptions, mach_msg_type_number_t *descriptionsCnt) { return _S_msg_describe_ports (process, refport, names, namesCnt, descriptions, descriptionsCnt); } error_t S_msg_report_wait (mach_port_t process, thread_t thread, string_t desc, int *rpc) { *desc = 0; *rpc = 0; return 0; }