4 * Citadel/UX "system dependent" stuff.
5 * See copyright.txt for copyright information.
7 * Here's where we (hopefully) have most parts of the Citadel server that
8 * would need to be altered to run the server in a non-POSIX environment.
10 * If we ever port to a different platform and either have multiple
11 * variants of this file or simply load it up with #ifdefs.
23 #include <sys/types.h>
26 #include <sys/socket.h>
28 #if TIME_WITH_SYS_TIME
29 # include <sys/time.h>
33 # include <sys/time.h>
40 #include <netinet/in.h>
57 #include "sysdep_decls.h"
58 #include "citserver.h"
62 #include "housekeeping.h"
63 #include "dynloader.h"
66 #ifdef HAVE_SYS_SELECT_H
67 #include <sys/select.h>
74 #ifdef DEBUG_MEMORY_LEAKS
75 struct TheHeap *heap = NULL;
78 pthread_mutex_t Critters[MAX_SEMAPHORES]; /* Things needing locking */
79 pthread_key_t MyConKey; /* TSD key for MyContext() */
81 int verbosity = DEFAULT_VERBOSITY; /* Logging level */
83 struct CitContext masterCC;
84 int rescan[2]; /* The Rescan Pipe */
85 time_t last_purge = 0; /* Last dead session purge */
86 static int num_threads = 0; /* Current number of threads */
87 int num_sessions = 0; /* Current number of sessions */
89 fd_set masterfds; /* Master sockets etc. */
92 time_t last_timer = 0L; /* Last timer hook processing */
94 static pthread_t initial_thread; /* tid for main() thread */
98 * lprintf() ... Write logging information
100 * Note: the variable "buf" below needs to be large enough to handle any
101 * log data sent through this function. BE CAREFUL!
103 void lprintf(int loglevel, const char *format, ...) {
107 va_start(arg_ptr, format);
108 vsprintf(buf, format, arg_ptr);
111 if (loglevel <= verbosity) {
115 gettimeofday(&tv, NULL);
116 tim = localtime(&(tv.tv_sec));
118 * Log provides millisecond accuracy. If you need
119 * microsecond accuracy and your OS supports it, change
120 * %03ld to %06ld and remove " / 1000" after tv.tv_usec.
122 fprintf(stderr, "%04d/%02d/%02d %2d:%02d:%02d.%03ld %s",
123 tim->tm_year + 1900, tim->tm_mon + 1, tim->tm_mday,
124 tim->tm_hour, tim->tm_min, tim->tm_sec,
125 tv.tv_usec / 1000, buf);
129 PerformLogHooks(loglevel, buf);
134 #ifdef DEBUG_MEMORY_LEAKS
135 void *tracked_malloc(size_t tsize, char *tfile, int tline) {
137 struct TheHeap *hptr;
141 lprintf(3, "DANGER! mallok(%d) at %s:%d failed!\n",
142 tsize, tfile, tline);
146 hptr = (struct TheHeap *) malloc(sizeof(struct TheHeap));
147 strcpy(hptr->h_file, tfile);
148 hptr->h_line = tline;
155 char *tracked_strdup(const char *orig, char *tfile, int tline) {
158 s = tracked_malloc( (strlen(orig)+1), tfile, tline);
159 if (s == NULL) return NULL;
165 void tracked_free(void *ptr) {
166 struct TheHeap *hptr, *freeme;
168 if (heap->h_ptr == ptr) {
174 for (hptr=heap; hptr->next!=NULL; hptr=hptr->next) {
175 if (hptr->next->h_ptr == ptr) {
177 hptr->next = hptr->next->next;
186 void *tracked_realloc(void *ptr, size_t size) {
188 struct TheHeap *hptr;
190 newptr = realloc(ptr, size);
192 for (hptr=heap; hptr!=NULL; hptr=hptr->next) {
193 if (hptr->h_ptr == ptr) hptr->h_ptr = newptr;
200 void dump_tracked() {
201 struct TheHeap *hptr;
203 cprintf("%d Here's what's allocated...\n", LISTING_FOLLOWS);
204 for (hptr=heap; hptr!=NULL; hptr=hptr->next) {
205 cprintf("%20s %5d\n",
206 hptr->h_file, hptr->h_line);
218 * We used to use master_cleanup() as a signal handler to shut down the server.
219 * however, master_cleanup() and the functions it calls do some things that
220 * aren't such a good idea to do from a signal handler: acquiring mutexes,
221 * playing with signal masks on BSDI systems, etc. so instead we install the
222 * following signal handler to set a global variable to inform the main loop
223 * that it's time to call master_cleanup() and exit.
226 volatile int time_to_die = 0;
228 static RETSIGTYPE signal_cleanup(int signum) {
234 * Some initialization stuff...
236 void init_sysdep(void) {
239 /* Set up a bunch of semaphores to be used for critical sections */
240 for (a=0; a<MAX_SEMAPHORES; ++a) {
241 pthread_mutex_init(&Critters[a], NULL);
245 * Set up a place to put thread-specific data.
246 * We only need a single pointer per thread - it points to the
247 * CitContext structure (in the ContextList linked list) of the
248 * session to which the calling thread is currently bound.
250 if (pthread_key_create(&MyConKey, NULL) != 0) {
251 lprintf(1, "Can't create TSD key!! %s\n", strerror(errno));
255 * The action for unexpected signals and exceptions should be to
256 * call signal_cleanup() to gracefully shut down the server.
258 signal(SIGINT, signal_cleanup);
259 signal(SIGQUIT, signal_cleanup);
260 signal(SIGHUP, signal_cleanup);
261 signal(SIGTERM, signal_cleanup);
264 * Do not shut down the server on broken pipe signals, otherwise the
265 * whole Citadel service would come down whenever a single client
268 signal(SIGPIPE, SIG_IGN);
273 * Obtain a semaphore lock to begin a critical section.
275 void begin_critical_section(int which_one)
277 /* lprintf(9, "begin_critical_section(%d)\n", which_one); */
278 /* ensure nobody ever tries to do a critical section within a
279 transaction; this could lead to deadlock. */
281 pthread_mutex_lock(&Critters[which_one]);
285 * Release a semaphore lock to end a critical section.
287 void end_critical_section(int which_one)
289 /* lprintf(9, "end_critical_section(%d)\n", which_one); */
290 pthread_mutex_unlock(&Critters[which_one]);
296 * This is a generic function to set up a master socket for listening on
297 * a TCP port. The server shuts down if the bind fails.
300 int ig_tcp_server(int port_number, int queue_len)
302 struct sockaddr_in sin;
304 int actual_queue_len;
306 actual_queue_len = queue_len;
307 if (actual_queue_len < 5) actual_queue_len = 5;
309 memset(&sin, 0, sizeof(sin));
310 sin.sin_family = AF_INET;
311 sin.sin_addr.s_addr = INADDR_ANY;
312 sin.sin_port = htons((u_short)port_number);
314 s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
317 lprintf(1, "citserver: Can't create a socket: %s\n",
323 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
325 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
326 lprintf(1, "citserver: Can't bind: %s\n",
332 if (listen(s, actual_queue_len) < 0) {
333 lprintf(1, "citserver: Can't listen: %s\n", strerror(errno));
344 * Create a Unix domain socket and listen on it
346 int ig_uds_server(char *sockpath, int queue_len)
348 struct sockaddr_un addr;
351 int actual_queue_len;
353 actual_queue_len = queue_len;
354 if (actual_queue_len < 5) actual_queue_len = 5;
356 i = unlink(sockpath);
357 if (i != 0) if (errno != ENOENT) {
358 lprintf(1, "citserver: can't unlink %s: %s\n",
359 sockpath, strerror(errno));
363 memset(&addr, 0, sizeof(addr));
364 addr.sun_family = AF_UNIX;
365 safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
367 s = socket(AF_UNIX, SOCK_STREAM, 0);
369 lprintf(1, "citserver: Can't create a socket: %s\n",
374 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
375 lprintf(1, "citserver: Can't bind: %s\n",
380 if (listen(s, actual_queue_len) < 0) {
381 lprintf(1, "citserver: Can't listen: %s\n", strerror(errno));
385 chmod(sockpath, 0777);
392 * Return a pointer to the CitContext structure bound to the thread which
393 * called this function. If there's no such binding (for example, if it's
394 * called by the housekeeper thread) then a generic 'master' CC is returned.
396 struct CitContext *MyContext(void) {
397 struct CitContext *retCC;
398 retCC = (struct CitContext *) pthread_getspecific(MyConKey);
399 if (retCC == NULL) retCC = &masterCC;
405 * Initialize a new context and place it in the list. The session number
406 * used to be the PID (which is why it's called cs_pid), but that was when we
407 * had one process per session. Now we just assign them sequentially, starting
408 * at 1 (don't change it to 0 because masterCC uses 0) and re-using them when
409 * sessions terminate.
411 struct CitContext *CreateNewContext(void) {
412 struct CitContext *me, *ptr;
416 me = (struct CitContext *) mallok(sizeof(struct CitContext));
418 lprintf(1, "citserver: can't allocate memory!!\n");
421 memset(me, 0, sizeof(struct CitContext));
423 /* The new context will be created already in the CON_EXECUTING state
424 * in order to prevent another thread from grabbing it while it's
427 me->state = CON_EXECUTING;
429 begin_critical_section(S_SESSION_TABLE);
431 /* obtain a unique session number */
434 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
435 if (ptr->cs_pid == num) {
440 } while (startover == 1);
443 me->next = ContextList;
447 end_critical_section(S_SESSION_TABLE);
454 * client_write() ... Send binary data to the client.
456 void client_write(char *buf, int nbytes)
458 int bytes_written = 0;
463 if (CC->redirect_fp != NULL) {
464 fwrite(buf, nbytes, 1, CC->redirect_fp);
468 if (CC->redirect_sock > 0) {
469 sock = CC->redirect_sock; /* and continue below... */
472 sock = CC->client_socket;
475 while (bytes_written < nbytes) {
476 retval = write(sock, &buf[bytes_written],
477 nbytes - bytes_written);
479 lprintf(2, "client_write() failed: %s\n",
481 if (sock == CC->client_socket) CC->kill_me = 1;
484 bytes_written = bytes_written + retval;
490 * cprintf() ... Send formatted printable data to the client. It is
491 * implemented in terms of client_write() but remains in
492 * sysdep.c in case we port to somewhere without va_args...
494 void cprintf(const char *format, ...) {
498 va_start(arg_ptr, format);
499 if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
500 buf[sizeof buf - 2] = '\n';
501 client_write(buf, strlen(buf));
507 * Read data from the client socket.
509 * 1 Requested number of bytes has been read.
510 * 0 Request timed out.
511 * -1 The socket is broken.
512 * If the socket breaks, the session will be terminated.
514 int client_read_to(char *buf, int bytes, int timeout)
524 FD_SET(CC->client_socket, &rfds);
528 retval = select( (CC->client_socket)+1,
529 &rfds, NULL, NULL, &tv);
531 if (FD_ISSET(CC->client_socket, &rfds) == 0) {
535 rlen = read(CC->client_socket, &buf[len], bytes-len);
537 lprintf(2, "client_read() failed: %s\n",
548 * Read data from the client socket with default timeout.
549 * (This is implemented in terms of client_read_to() and could be
550 * justifiably moved out of sysdep.c)
552 int client_read(char *buf, int bytes)
554 return(client_read_to(buf, bytes, config.c_sleeping));
559 * client_gets() ... Get a LF-terminated line of text from the client.
560 * (This is implemented in terms of client_read() and could be
561 * justifiably moved out of sysdep.c)
563 int client_gets(char *buf)
567 /* Read one character at a time.
570 retval = client_read(&buf[i], 1);
571 if (retval != 1 || buf[i] == '\n' || i == (SIZ-1))
575 /* If we got a long line, discard characters until the newline.
578 while (buf[i] != '\n' && retval == 1)
579 retval = client_read(&buf[i], 1);
581 /* Strip the trailing newline and any trailing nonprintables (cr's)
584 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
585 buf[strlen(buf)-1] = 0;
586 if (retval < 0) strcpy(buf, "000");
593 * The system-dependent part of master_cleanup() - close the master socket.
595 void sysdep_master_cleanup(void) {
596 struct ServiceFunctionHook *serviceptr;
599 * close all protocol master sockets
601 for (serviceptr = ServiceHookTable; serviceptr != NULL;
602 serviceptr = serviceptr->next ) {
604 if (serviceptr->tcp_port > 0)
605 lprintf(3, "Closing listener on port %d\n",
606 serviceptr->tcp_port);
608 if (serviceptr->sockpath != NULL)
609 lprintf(3, "Closing listener on '%s'\n",
610 serviceptr->sockpath);
612 close(serviceptr->msock);
614 /* If it's a Unix domain socket, remove the file. */
615 if (serviceptr->sockpath != NULL) {
616 unlink(serviceptr->sockpath);
623 * Terminate another session.
624 * (This could justifiably be moved out of sysdep.c because it
625 * no longer does anything that is system-dependent.)
627 void kill_session(int session_to_kill) {
628 struct CitContext *ptr;
630 begin_critical_section(S_SESSION_TABLE);
631 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
632 if (ptr->cs_pid == session_to_kill) {
636 end_critical_section(S_SESSION_TABLE);
643 * Start running as a daemon. Only close stdio if do_close_stdio is set.
645 void start_daemon(int do_close_stdio) {
646 if (do_close_stdio) {
651 signal(SIGHUP,SIG_IGN);
652 signal(SIGINT,SIG_IGN);
653 signal(SIGQUIT,SIG_IGN);
654 if (fork()!=0) exit(0);
660 * Tie in to the 'netsetup' program.
662 * (We're going to hope that netsetup never feeds more than 4096 bytes back.)
664 void cmd_nset(char *cmdbuf)
671 char netsetup_args[3][SIZ];
673 if (CC->usersupp.axlevel < 6) {
674 cprintf("%d Higher access required.\n",
675 ERROR + HIGHER_ACCESS_REQUIRED);
679 for (a=1; a<=3; ++a) {
680 if (num_parms(cmdbuf) >= a) {
681 extract(netsetup_args[a-1], cmdbuf, a-1);
682 for (b=0; b<strlen(netsetup_args[a-1]); ++b) {
683 if (netsetup_args[a-1][b] == 34) {
684 netsetup_args[a-1][b] = '_';
689 netsetup_args[a-1][0] = 0;
693 sprintf(fbuf, "./netsetup \"%s\" \"%s\" \"%s\" </dev/null 2>&1",
694 netsetup_args[0], netsetup_args[1], netsetup_args[2]);
695 netsetup = popen(fbuf, "r");
696 if (netsetup == NULL) {
697 cprintf("%d %s\n", ERROR, strerror(errno));
702 while (ch = getc(netsetup), (ch > 0)) {
703 fbuf[strlen(fbuf)+1] = 0;
704 fbuf[strlen(fbuf)] = ch;
707 retcode = pclose(netsetup);
710 for (a=0; a<strlen(fbuf); ++a) {
711 if (fbuf[a] < 32) fbuf[a] = 32;
714 cprintf("%d %s\n", ERROR, fbuf);
718 cprintf("%d Command succeeded. Output follows:\n", LISTING_FOLLOWS);
720 if (fbuf[strlen(fbuf)-1] != 10) cprintf("\n");
727 * Generic routine to convert a login name to a full name (gecos)
728 * Returns nonzero if a conversion took place
730 int convert_login(char NameToConvert[]) {
734 pw = getpwnam(NameToConvert);
739 strcpy(NameToConvert, pw->pw_gecos);
740 for (a=0; a<strlen(NameToConvert); ++a) {
741 if (NameToConvert[a] == ',') NameToConvert[a] = 0;
747 static struct worker_node {
749 struct worker_node *next;
750 } *worker_list = NULL;
754 * create a worker thread. this function must always be called from within
755 * an S_WORKER_LIST critical section!
757 static void create_worker(void) {
759 struct worker_node *n = mallok(sizeof *n);
762 lprintf(1, "can't allocate worker_node, exiting\n");
767 if ((ret = pthread_create(&n->tid, NULL, worker_thread, NULL) != 0))
770 lprintf(1, "Can't create worker thread: %s\n",
774 n->next = worker_list;
781 * Purge all sessions which have the 'kill_me' flag set.
782 * This function has code to prevent it from running more than once every
783 * few seconds, because running it after every single unbind would waste a lot
784 * of CPU time and keep the context list locked too much.
786 * After that's done, we raise or lower the size of the worker thread pool
787 * if such an action is appropriate.
789 void dead_session_purge(void) {
790 struct CitContext *ptr, *rem;
791 struct worker_node **node, *tmp;
794 if ( (time(NULL) - last_purge) < 5 ) return; /* Too soon, go away */
799 begin_critical_section(S_SESSION_TABLE);
800 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
801 if ( (ptr->state == CON_IDLE) && (ptr->kill_me) ) {
805 end_critical_section(S_SESSION_TABLE);
807 /* RemoveContext() enters its own S_SESSION_TABLE critical
808 * section, so we have to do it like this.
811 lprintf(9, "Purging session %d\n", rem->cs_pid);
815 } while (rem != NULL);
818 /* Raise or lower the size of the worker thread pool if such
819 * an action is appropriate.
822 self = pthread_self();
824 if ( (num_sessions > num_threads)
825 && (num_threads < config.c_max_workers) ) {
826 begin_critical_section(S_WORKER_LIST);
828 end_critical_section(S_WORKER_LIST);
831 /* don't let the initial thread die since it's responsible for
832 waiting for all the other threads to terminate. */
833 else if ( (num_sessions < num_threads)
834 && (num_threads > config.c_min_workers)
835 && (self != initial_thread) ) {
837 begin_critical_section(S_WORKER_LIST);
840 /* we're exiting before server shutdown... unlink ourself from
841 the worker list and detach our thread to avoid memory leaks
844 for (node = &worker_list; *node != NULL; node = &(*node)->next)
845 if ((*node)->tid == self) {
847 *node = (*node)->next;
852 pthread_detach(self);
853 end_critical_section(S_WORKER_LIST);
864 * Redirect a session's output to a file or socket.
865 * This function may be called with a file handle *or* a socket (but not
866 * both). Call with neither to return output to its normal client socket.
868 void CtdlRedirectOutput(FILE *fp, int sock) {
870 if (fp != NULL) CC->redirect_fp = fp;
871 else CC->redirect_fp = NULL;
873 if (sock > 0) CC->redirect_sock = sock;
874 else CC->redirect_sock = (-1);
880 * masterCC is the context we use when not attached to a session. This
881 * function initializes it.
883 void InitializeMasterCC(void) {
884 memset(&masterCC, 0, sizeof(struct CitContext));
885 masterCC.internal_pgm = 1;
892 * Set up a fd_set containing all the master sockets to which we
893 * always listen. It's computationally less expensive to just copy
894 * this to a local fd_set when starting a new select() and then add
895 * the client sockets than it is to initialize a new one and then
896 * figure out what to put there.
898 void init_master_fdset(void) {
899 struct ServiceFunctionHook *serviceptr;
902 lprintf(9, "Initializing master fdset\n");
907 lprintf(9, "Will listen on rescan pipe %d\n", rescan[0]);
908 FD_SET(rescan[0], &masterfds);
909 if (rescan[0] > masterhighest) masterhighest = rescan[0];
911 for (serviceptr = ServiceHookTable; serviceptr != NULL;
912 serviceptr = serviceptr->next ) {
913 m = serviceptr->msock;
914 lprintf(9, "Will listen on master socket %d\n", m);
915 FD_SET(m, &masterfds);
916 if (m > masterhighest) {
920 lprintf(9, "masterhighest = %d\n", masterhighest);
926 * Here's where it all begins.
928 int main(int argc, char **argv)
930 char tracefile[128]; /* Name of file to log traces to */
931 int a, i; /* General-purpose variables */
933 int drop_root_perms = 1;
935 struct worker_node *wnp;
937 /* specify default port name and trace file */
938 strcpy(tracefile, "");
940 /* initialize the master context */
941 InitializeMasterCC();
943 /* parse command-line arguments */
944 for (a=1; a<argc; ++a) {
946 /* -t specifies where to log trace messages to */
947 if (!strncmp(argv[a], "-t", 2)) {
948 strcpy(tracefile, argv[a]);
949 strcpy(tracefile, &tracefile[2]);
950 freopen(tracefile, "r", stdin);
951 freopen(tracefile, "w", stdout);
952 freopen(tracefile, "w", stderr);
955 /* run in the background if -d was specified */
956 else if (!strcmp(argv[a], "-d")) {
957 start_daemon( (strlen(tracefile) > 0) ? 0 : 1 ) ;
960 /* -x specifies the desired logging level */
961 else if (!strncmp(argv[a], "-x", 2)) {
962 verbosity = atoi(&argv[a][2]);
965 else if (!strncmp(argv[a], "-h", 2)) {
966 safestrncpy(bbs_home_directory, &argv[a][2],
967 sizeof bbs_home_directory);
971 else if (!strncmp(argv[a], "-f", 2)) {
975 /* -r tells the server not to drop root permissions. don't use
976 * this unless you know what you're doing. this should be
977 * removed in the next release if it proves unnecessary. */
978 else if (!strcmp(argv[a], "-r"))
981 /* any other parameter makes it crash and burn */
983 lprintf(1, "citserver: usage: "
984 "citserver [-tTraceFile] [-d] [-f]"
985 " [-xLogLevel] [-hHomeDir]\n");
991 /* Tell 'em who's in da house */
993 "\nMultithreaded message server for Citadel/UX\n"
994 "Copyright (C) 1987-2001 by the Citadel/UX development team.\n"
995 "Citadel/UX is free software, covered by the GNU General Public License, and\n"
996 "you are welcome to change it and/or distribute copies of it under certain\n"
997 "conditions. There is absolutely no warranty for this software. Please\n"
998 "read the 'COPYING.txt' file for details.\n\n");
1002 openlog("citserver", LOG_PID, LOG_USER);
1004 /* Load site-specific parameters */
1005 lprintf(7, "Loading citadel.config\n");
1010 * Do non system dependent startup functions.
1015 * Bind the server to a Unix-domain socket.
1017 CtdlRegisterServiceHook(0,
1019 citproto_begin_session,
1023 * Bind the server to our favorite TCP port (usually 504).
1025 CtdlRegisterServiceHook(config.c_port_number,
1027 citproto_begin_session,
1031 * Load any server-side modules (plugins) available here.
1033 lprintf(7, "Initializing loadable modules\n");
1034 if ((moddir = malloc(strlen(bbs_home_directory) + 9)) != NULL) {
1035 sprintf(moddir, "%s/modules", bbs_home_directory);
1036 DLoader_Init(moddir);
1041 * The rescan pipe exists so that worker threads can be woken up and
1042 * told to re-scan the context list for fd's to listen on. This is
1043 * necessary, for example, when a context is about to go idle and needs
1044 * to get back on that list.
1047 lprintf(1, "Can't create rescan pipe!\n");
1051 init_master_fdset();
1054 * Now that we've bound the sockets, change to the BBS user id and its
1055 * corresponding group ids
1057 if (drop_root_perms) {
1058 if ((pw = getpwuid(BBSUID)) == NULL)
1059 lprintf(1, "WARNING: getpwuid(%d): %s\n"
1060 "Group IDs will be incorrect.\n", BBSUID,
1063 initgroups(pw->pw_name, pw->pw_gid);
1064 if (setgid(pw->pw_gid))
1065 lprintf(3, "setgid(%d): %s\n", pw->pw_gid,
1068 lprintf(7, "Changing uid to %d\n", BBSUID);
1069 if (setuid(BBSUID) != 0) {
1070 lprintf(3, "setuid() failed: %s\n", strerror(errno));
1074 /* We want to check for idle sessions once per minute */
1075 CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
1078 * Now create a bunch of worker threads.
1080 lprintf(9, "Starting %d worker threads\n", config.c_min_workers-1);
1081 begin_critical_section(S_WORKER_LIST);
1082 for (i=0; i<(config.c_min_workers-1); ++i) {
1085 end_critical_section(S_WORKER_LIST);
1087 /* Now this thread can become a worker as well. */
1088 initial_thread = pthread_self();
1089 worker_thread(NULL);
1091 /* Server is exiting. Wait for workers to shutdown. */
1092 lprintf(7, "Waiting for worker threads to shut down\n");
1094 begin_critical_section(S_WORKER_LIST);
1095 while (worker_list != NULL) {
1097 worker_list = wnp->next;
1099 /* avoid deadlock with an exiting thread */
1100 end_critical_section(S_WORKER_LIST);
1101 if ((i = pthread_join(wnp->tid, NULL)))
1102 lprintf(1, "pthread_join: %s\n", strerror(i));
1104 begin_critical_section(S_WORKER_LIST);
1106 end_critical_section(S_WORKER_LIST);
1115 * Bind a thread to a context. (It's inline merely to speed things up.)
1117 inline void become_session(struct CitContext *which_con) {
1118 pthread_setspecific(MyConKey, (void *)which_con );
1124 * This loop just keeps going and going and going...
1126 void *worker_thread(void *arg) {
1130 struct CitContext *ptr;
1131 struct CitContext *bind_me = NULL;
1134 struct CitContext *con= NULL; /* Temporary context pointer */
1135 struct ServiceFunctionHook *serviceptr;
1136 struct sockaddr_in fsin; /* Data for master socket */
1137 int alen; /* Data for master socket */
1138 int ssock; /* Descriptor for client socket */
1145 while (!time_to_die) {
1148 * A naive implementation would have all idle threads
1149 * calling select() and then they'd all wake up at once. We
1150 * solve this problem by putting the select() in a critical
1151 * section, so only one thread has the opportunity to wake
1152 * up. If we wake up on a master socket, create a new
1153 * session context; otherwise, just bind the thread to the
1154 * context we want and go on our merry way.
1157 /* make doubly sure we're not holding any stale db handles
1158 * which might cause a deadlock.
1160 cdb_check_handles();
1162 begin_critical_section(S_I_WANNA_SELECT);
1163 SETUP_FD: memcpy(&readfds, &masterfds, sizeof masterfds);
1164 highest = masterhighest;
1165 begin_critical_section(S_SESSION_TABLE);
1166 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1167 if (ptr->state == CON_IDLE) {
1168 FD_SET(ptr->client_socket, &readfds);
1169 if (ptr->client_socket > highest)
1170 highest = ptr->client_socket;
1173 end_critical_section(S_SESSION_TABLE);
1175 tv.tv_sec = 1; /* wake up every second if no input */
1180 retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1182 end_critical_section(S_I_WANNA_SELECT);
1186 /* Now figure out who made this select() unblock.
1187 * First, check for an error or exit condition.
1190 if (errno != EINTR) {
1191 lprintf(9, "Exiting (%s)\n", strerror(errno));
1193 } else if (!time_to_die)
1197 /* Next, check to see if it's a new client connecting
1198 * on a master socket.
1200 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1201 serviceptr = serviceptr->next ) {
1203 if (FD_ISSET(serviceptr->msock, &readfds)) {
1205 ssock = accept(serviceptr->msock,
1206 (struct sockaddr *)&fsin, &alen);
1208 lprintf(2, "citserver: accept(): %s\n",
1212 lprintf(7, "citserver: "
1213 "New client socket %d\n",
1216 /* New context will be created already
1217 * set up in the CON_EXECUTING state.
1219 con = CreateNewContext();
1221 /* Assign new socket number to it. */
1222 con->client_socket = ssock;
1223 con->h_command_function =
1224 serviceptr->h_command_function;
1226 /* Determine whether local socket */
1227 if (serviceptr->sockpath != NULL)
1228 con->is_local_socket = 1;
1230 /* Set the SO_REUSEADDR socket option */
1232 setsockopt(ssock, SOL_SOCKET,
1236 become_session(con);
1238 serviceptr->h_greeting_function();
1239 become_session(NULL);
1240 con->state = CON_IDLE;
1246 /* If the rescan pipe went active, someone is telling this
1247 * thread that the &readfds needs to be refreshed with more
1251 end_critical_section(S_I_WANNA_SELECT);
1255 if (FD_ISSET(rescan[0], &readfds)) {
1256 read(rescan[0], &junk, 1);
1260 /* It must be a client socket. Find a context that has data
1261 * waiting on its socket *and* is in the CON_IDLE state.
1265 begin_critical_section(S_SESSION_TABLE);
1266 for (ptr = ContextList;
1267 ( (ptr != NULL) && (bind_me == NULL) );
1269 if ( (FD_ISSET(ptr->client_socket, &readfds))
1270 && (ptr->state == CON_IDLE) ) {
1274 if (bind_me != NULL) {
1275 /* Found one. Stake a claim to it before
1276 * letting anyone else touch the context list.
1278 bind_me->state = CON_EXECUTING;
1281 end_critical_section(S_SESSION_TABLE);
1282 end_critical_section(S_I_WANNA_SELECT);
1284 /* We're bound to a session, now do *one* command */
1285 if (bind_me != NULL) {
1286 become_session(bind_me);
1287 CC->h_command_function();
1288 become_session(NULL);
1289 bind_me->state = CON_IDLE;
1290 if (bind_me->kill_me == 1) {
1291 RemoveContext(bind_me);
1293 write(rescan[1], &junk, 1);
1297 dead_session_purge();
1298 if ((time(NULL) - last_timer) > 60L) {
1299 last_timer = time(NULL);
1300 cdb_check_handles(); /* suggested by Justin Case */
1301 PerformSessionHooks(EVT_TIMER);
1304 check_sched_shutdown();
1307 /* If control reaches this point, the server is shutting down */