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>
29 #include <netinet/in.h>
46 #include "sysdep_decls.h"
47 #include "citserver.h"
51 #include "housekeeping.h"
52 #include "dynloader.h"
55 #ifdef HAVE_SYS_SELECT_H
56 #include <sys/select.h>
63 #ifdef DEBUG_MEMORY_LEAKS
64 struct TheHeap *heap = NULL;
67 pthread_mutex_t Critters[MAX_SEMAPHORES]; /* Things needing locking */
68 pthread_key_t MyConKey; /* TSD key for MyContext() */
70 int verbosity = DEFAULT_VERBOSITY; /* Logging level */
72 struct CitContext masterCC;
73 int rescan[2]; /* The Rescan Pipe */
74 time_t last_purge = 0; /* Last dead session purge */
75 static int num_threads = 0; /* Current number of threads */
76 int num_sessions = 0; /* Current number of sessions */
78 fd_set masterfds; /* Master sockets etc. */
81 time_t last_timer = 0L; /* Last timer hook processing */
83 static pthread_t initial_thread; /* tid for main() thread */
87 * lprintf() ... Write logging information
89 * Note: the variable "buf" below needs to be large enough to handle any
90 * log data sent through this function. BE CAREFUL!
92 void lprintf(int loglevel, const char *format, ...) {
96 va_start(arg_ptr, format);
97 vsprintf(buf, format, arg_ptr);
100 if (loglevel <= verbosity) {
104 gettimeofday(&tv, NULL);
105 tim = localtime(&(tv.tv_sec));
107 * Log provides millisecond accuracy. If you need
108 * microsecond accuracy and your OS supports it, change
109 * %03ld to %06ld and remove " / 1000" after tv.tv_usec.
111 fprintf(stderr, "%04d/%02d/%02d %2d:%02d:%02d.%03ld %s",
112 tim->tm_year + 1900, tim->tm_mon + 1, tim->tm_mday,
113 tim->tm_hour, tim->tm_min, tim->tm_sec,
114 tv.tv_usec / 1000, buf);
118 PerformLogHooks(loglevel, buf);
123 #ifdef DEBUG_MEMORY_LEAKS
124 void *tracked_malloc(size_t tsize, char *tfile, int tline) {
126 struct TheHeap *hptr;
130 lprintf(3, "DANGER! mallok(%d) at %s:%d failed!\n",
131 tsize, tfile, tline);
135 hptr = (struct TheHeap *) malloc(sizeof(struct TheHeap));
136 strcpy(hptr->h_file, tfile);
137 hptr->h_line = tline;
144 char *tracked_strdup(const char *orig, char *tfile, int tline) {
147 s = tracked_malloc( (strlen(orig)+1), tfile, tline);
148 if (s == NULL) return NULL;
154 void tracked_free(void *ptr) {
155 struct TheHeap *hptr, *freeme;
157 if (heap->h_ptr == ptr) {
163 for (hptr=heap; hptr->next!=NULL; hptr=hptr->next) {
164 if (hptr->next->h_ptr == ptr) {
166 hptr->next = hptr->next->next;
175 void *tracked_realloc(void *ptr, size_t size) {
177 struct TheHeap *hptr;
179 newptr = realloc(ptr, size);
181 for (hptr=heap; hptr!=NULL; hptr=hptr->next) {
182 if (hptr->h_ptr == ptr) hptr->h_ptr = newptr;
189 void dump_tracked() {
190 struct TheHeap *hptr;
192 cprintf("%d Here's what's allocated...\n", LISTING_FOLLOWS);
193 for (hptr=heap; hptr!=NULL; hptr=hptr->next) {
194 cprintf("%20s %5d\n",
195 hptr->h_file, hptr->h_line);
207 * We used to use master_cleanup() as a signal handler to shut down the server.
208 * however, master_cleanup() and the functions it calls do some things that
209 * aren't such a good idea to do from a signal handler: acquiring mutexes,
210 * playing with signal masks on BSDI systems, etc. so instead we install the
211 * following signal handler to set a global variable to inform the main loop
212 * that it's time to call master_cleanup() and exit.
215 volatile int time_to_die = 0;
217 static RETSIGTYPE signal_cleanup(int signum) {
223 * Some initialization stuff...
225 void init_sysdep(void) {
228 /* Set up a bunch of semaphores to be used for critical sections */
229 for (a=0; a<MAX_SEMAPHORES; ++a) {
230 pthread_mutex_init(&Critters[a], NULL);
234 * Set up a place to put thread-specific data.
235 * We only need a single pointer per thread - it points to the
236 * CitContext structure (in the ContextList linked list) of the
237 * session to which the calling thread is currently bound.
239 if (pthread_key_create(&MyConKey, NULL) != 0) {
240 lprintf(1, "Can't create TSD key!! %s\n", strerror(errno));
244 * The action for unexpected signals and exceptions should be to
245 * call signal_cleanup() to gracefully shut down the server.
247 signal(SIGINT, signal_cleanup);
248 signal(SIGQUIT, signal_cleanup);
249 signal(SIGHUP, signal_cleanup);
250 signal(SIGTERM, signal_cleanup);
253 * Do not shut down the server on broken pipe signals, otherwise the
254 * whole Citadel service would come down whenever a single client
257 signal(SIGPIPE, SIG_IGN);
262 * Obtain a semaphore lock to begin a critical section.
264 void begin_critical_section(int which_one)
266 /* lprintf(9, "begin_critical_section(%d)\n", which_one); */
267 /* ensure nobody ever tries to do a critical section within a
268 transaction; this could lead to deadlock. */
270 pthread_mutex_lock(&Critters[which_one]);
274 * Release a semaphore lock to end a critical section.
276 void end_critical_section(int which_one)
278 /* lprintf(9, "end_critical_section(%d)\n", which_one); */
279 pthread_mutex_unlock(&Critters[which_one]);
285 * This is a generic function to set up a master socket for listening on
286 * a TCP port. The server shuts down if the bind fails.
289 int ig_tcp_server(int port_number, int queue_len)
291 struct sockaddr_in sin;
293 int actual_queue_len;
295 actual_queue_len = queue_len;
296 if (actual_queue_len < 5) actual_queue_len = 5;
298 memset(&sin, 0, sizeof(sin));
299 sin.sin_family = AF_INET;
300 sin.sin_addr.s_addr = INADDR_ANY;
301 sin.sin_port = htons((u_short)port_number);
303 s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
306 lprintf(1, "citserver: Can't create a socket: %s\n",
312 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
314 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
315 lprintf(1, "citserver: Can't bind: %s\n",
321 if (listen(s, actual_queue_len) < 0) {
322 lprintf(1, "citserver: Can't listen: %s\n", strerror(errno));
333 * Create a Unix domain socket and listen on it
335 int ig_uds_server(char *sockpath, int queue_len)
337 struct sockaddr_un addr;
340 int actual_queue_len;
342 actual_queue_len = queue_len;
343 if (actual_queue_len < 5) actual_queue_len = 5;
345 i = unlink(sockpath);
346 if (i != 0) if (errno != ENOENT) {
347 lprintf(1, "citserver: can't unlink %s: %s\n",
348 sockpath, strerror(errno));
352 memset(&addr, 0, sizeof(addr));
353 addr.sun_family = AF_UNIX;
354 safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
356 s = socket(AF_UNIX, SOCK_STREAM, 0);
358 lprintf(1, "citserver: Can't create a socket: %s\n",
363 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
364 lprintf(1, "citserver: Can't bind: %s\n",
369 if (listen(s, actual_queue_len) < 0) {
370 lprintf(1, "citserver: Can't listen: %s\n", strerror(errno));
374 chmod(sockpath, 0777);
381 * Return a pointer to the CitContext structure bound to the thread which
382 * called this function. If there's no such binding (for example, if it's
383 * called by the housekeeper thread) then a generic 'master' CC is returned.
385 struct CitContext *MyContext(void) {
386 struct CitContext *retCC;
387 retCC = (struct CitContext *) pthread_getspecific(MyConKey);
388 if (retCC == NULL) retCC = &masterCC;
394 * Initialize a new context and place it in the list. The session number
395 * used to be the PID (which is why it's called cs_pid), but that was when we
396 * had one process per session. Now we just assign them sequentially, starting
397 * at 1 (don't change it to 0 because masterCC uses 0) and re-using them when
398 * sessions terminate.
400 struct CitContext *CreateNewContext(void) {
401 struct CitContext *me, *ptr;
405 me = (struct CitContext *) mallok(sizeof(struct CitContext));
407 lprintf(1, "citserver: can't allocate memory!!\n");
410 memset(me, 0, sizeof(struct CitContext));
412 /* The new context will be created already in the CON_EXECUTING state
413 * in order to prevent another thread from grabbing it while it's
416 me->state = CON_EXECUTING;
418 begin_critical_section(S_SESSION_TABLE);
420 /* obtain a unique session number */
423 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
424 if (ptr->cs_pid == num) {
429 } while (startover == 1);
432 me->next = ContextList;
436 end_critical_section(S_SESSION_TABLE);
443 * client_write() ... Send binary data to the client.
445 void client_write(char *buf, int nbytes)
447 int bytes_written = 0;
452 if (CC->redirect_fp != NULL) {
453 fwrite(buf, nbytes, 1, CC->redirect_fp);
457 if (CC->redirect_sock > 0) {
458 sock = CC->redirect_sock; /* and continue below... */
461 sock = CC->client_socket;
464 while (bytes_written < nbytes) {
465 retval = write(sock, &buf[bytes_written],
466 nbytes - bytes_written);
468 lprintf(2, "client_write() failed: %s\n",
470 if (sock == CC->client_socket) CC->kill_me = 1;
473 bytes_written = bytes_written + retval;
479 * cprintf() ... Send formatted printable data to the client. It is
480 * implemented in terms of client_write() but remains in
481 * sysdep.c in case we port to somewhere without va_args...
483 void cprintf(const char *format, ...) {
487 va_start(arg_ptr, format);
488 if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
489 buf[sizeof buf - 2] = '\n';
490 client_write(buf, strlen(buf));
496 * Read data from the client socket.
498 * 1 Requested number of bytes has been read.
499 * 0 Request timed out.
500 * -1 The socket is broken.
501 * If the socket breaks, the session will be terminated.
503 int client_read_to(char *buf, int bytes, int timeout)
513 FD_SET(CC->client_socket, &rfds);
517 retval = select( (CC->client_socket)+1,
518 &rfds, NULL, NULL, &tv);
520 if (FD_ISSET(CC->client_socket, &rfds) == 0) {
524 rlen = read(CC->client_socket, &buf[len], bytes-len);
526 lprintf(2, "client_read() failed: %s\n",
537 * Read data from the client socket with default timeout.
538 * (This is implemented in terms of client_read_to() and could be
539 * justifiably moved out of sysdep.c)
541 int client_read(char *buf, int bytes)
543 return(client_read_to(buf, bytes, config.c_sleeping));
548 * client_gets() ... Get a LF-terminated line of text from the client.
549 * (This is implemented in terms of client_read() and could be
550 * justifiably moved out of sysdep.c)
552 int client_gets(char *buf)
556 /* Read one character at a time.
559 retval = client_read(&buf[i], 1);
560 if (retval != 1 || buf[i] == '\n' || i == (SIZ-1))
564 /* If we got a long line, discard characters until the newline.
567 while (buf[i] != '\n' && retval == 1)
568 retval = client_read(&buf[i], 1);
570 /* Strip the trailing newline and any trailing nonprintables (cr's)
573 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
574 buf[strlen(buf)-1] = 0;
575 if (retval < 0) strcpy(buf, "000");
582 * The system-dependent part of master_cleanup() - close the master socket.
584 void sysdep_master_cleanup(void) {
585 struct ServiceFunctionHook *serviceptr;
588 * close all protocol master sockets
590 for (serviceptr = ServiceHookTable; serviceptr != NULL;
591 serviceptr = serviceptr->next ) {
593 if (serviceptr->tcp_port > 0)
594 lprintf(3, "Closing listener on port %d\n",
595 serviceptr->tcp_port);
597 if (serviceptr->sockpath != NULL)
598 lprintf(3, "Closing listener on '%s'\n",
599 serviceptr->sockpath);
601 close(serviceptr->msock);
603 /* If it's a Unix domain socket, remove the file. */
604 if (serviceptr->sockpath != NULL) {
605 unlink(serviceptr->sockpath);
612 * Terminate another session.
613 * (This could justifiably be moved out of sysdep.c because it
614 * no longer does anything that is system-dependent.)
616 void kill_session(int session_to_kill) {
617 struct CitContext *ptr;
619 begin_critical_section(S_SESSION_TABLE);
620 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
621 if (ptr->cs_pid == session_to_kill) {
625 end_critical_section(S_SESSION_TABLE);
632 * Start running as a daemon. Only close stdio if do_close_stdio is set.
634 void start_daemon(int do_close_stdio) {
635 if (do_close_stdio) {
640 signal(SIGHUP,SIG_IGN);
641 signal(SIGINT,SIG_IGN);
642 signal(SIGQUIT,SIG_IGN);
643 if (fork()!=0) exit(0);
649 * Tie in to the 'netsetup' program.
651 * (We're going to hope that netsetup never feeds more than 4096 bytes back.)
653 void cmd_nset(char *cmdbuf)
660 char netsetup_args[3][SIZ];
662 if (CC->usersupp.axlevel < 6) {
663 cprintf("%d Higher access required.\n",
664 ERROR + HIGHER_ACCESS_REQUIRED);
668 for (a=1; a<=3; ++a) {
669 if (num_parms(cmdbuf) >= a) {
670 extract(netsetup_args[a-1], cmdbuf, a-1);
671 for (b=0; b<strlen(netsetup_args[a-1]); ++b) {
672 if (netsetup_args[a-1][b] == 34) {
673 netsetup_args[a-1][b] = '_';
678 netsetup_args[a-1][0] = 0;
682 sprintf(fbuf, "./netsetup \"%s\" \"%s\" \"%s\" </dev/null 2>&1",
683 netsetup_args[0], netsetup_args[1], netsetup_args[2]);
684 netsetup = popen(fbuf, "r");
685 if (netsetup == NULL) {
686 cprintf("%d %s\n", ERROR, strerror(errno));
691 while (ch = getc(netsetup), (ch > 0)) {
692 fbuf[strlen(fbuf)+1] = 0;
693 fbuf[strlen(fbuf)] = ch;
696 retcode = pclose(netsetup);
699 for (a=0; a<strlen(fbuf); ++a) {
700 if (fbuf[a] < 32) fbuf[a] = 32;
703 cprintf("%d %s\n", ERROR, fbuf);
707 cprintf("%d Command succeeded. Output follows:\n", LISTING_FOLLOWS);
709 if (fbuf[strlen(fbuf)-1] != 10) cprintf("\n");
716 * Generic routine to convert a login name to a full name (gecos)
717 * Returns nonzero if a conversion took place
719 int convert_login(char NameToConvert[]) {
723 pw = getpwnam(NameToConvert);
728 strcpy(NameToConvert, pw->pw_gecos);
729 for (a=0; a<strlen(NameToConvert); ++a) {
730 if (NameToConvert[a] == ',') NameToConvert[a] = 0;
736 static struct worker_node {
738 struct worker_node *next;
739 } *worker_list = NULL;
743 * create a worker thread. this function must always be called from within
744 * an S_WORKER_LIST critical section!
746 static void create_worker(void) {
748 struct worker_node *n = mallok(sizeof *n);
751 lprintf(1, "can't allocate worker_node, exiting\n");
756 if ((ret = pthread_create(&n->tid, NULL, worker_thread, NULL) != 0))
759 lprintf(1, "Can't create worker thread: %s\n",
763 n->next = worker_list;
770 * Purge all sessions which have the 'kill_me' flag set.
771 * This function has code to prevent it from running more than once every
772 * few seconds, because running it after every single unbind would waste a lot
773 * of CPU time and keep the context list locked too much.
775 * After that's done, we raise or lower the size of the worker thread pool
776 * if such an action is appropriate.
778 void dead_session_purge(void) {
779 struct CitContext *ptr, *rem;
780 struct worker_node **node, *tmp;
783 if ( (time(NULL) - last_purge) < 5 ) return; /* Too soon, go away */
788 begin_critical_section(S_SESSION_TABLE);
789 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
790 if ( (ptr->state == CON_IDLE) && (ptr->kill_me) ) {
794 end_critical_section(S_SESSION_TABLE);
796 /* RemoveContext() enters its own S_SESSION_TABLE critical
797 * section, so we have to do it like this.
800 lprintf(9, "Purging session %d\n", rem->cs_pid);
804 } while (rem != NULL);
807 /* Raise or lower the size of the worker thread pool if such
808 * an action is appropriate.
811 self = pthread_self();
813 if ( (num_sessions > num_threads)
814 && (num_threads < config.c_max_workers) ) {
815 begin_critical_section(S_WORKER_LIST);
817 end_critical_section(S_WORKER_LIST);
820 /* don't let the initial thread die since it's responsible for
821 waiting for all the other threads to terminate. */
822 else if ( (num_sessions < num_threads)
823 && (num_threads > config.c_min_workers)
824 && (self != initial_thread) ) {
826 begin_critical_section(S_WORKER_LIST);
829 /* we're exiting before server shutdown... unlink ourself from
830 the worker list and detach our thread to avoid memory leaks
833 for (node = &worker_list; *node != NULL; node = &(*node)->next)
834 if ((*node)->tid == self) {
836 *node = (*node)->next;
841 pthread_detach(self);
842 end_critical_section(S_WORKER_LIST);
853 * Redirect a session's output to a file or socket.
854 * This function may be called with a file handle *or* a socket (but not
855 * both). Call with neither to return output to its normal client socket.
857 void CtdlRedirectOutput(FILE *fp, int sock) {
859 if (fp != NULL) CC->redirect_fp = fp;
860 else CC->redirect_fp = NULL;
862 if (sock > 0) CC->redirect_sock = sock;
863 else CC->redirect_sock = (-1);
869 * masterCC is the context we use when not attached to a session. This
870 * function initializes it.
872 void InitializeMasterCC(void) {
873 memset(&masterCC, 0, sizeof(struct CitContext));
874 masterCC.internal_pgm = 1;
881 * Set up a fd_set containing all the master sockets to which we
882 * always listen. It's computationally less expensive to just copy
883 * this to a local fd_set when starting a new select() and then add
884 * the client sockets than it is to initialize a new one and then
885 * figure out what to put there.
887 void init_master_fdset(void) {
888 struct ServiceFunctionHook *serviceptr;
891 lprintf(9, "Initializing master fdset\n");
896 lprintf(9, "Will listen on rescan pipe %d\n", rescan[0]);
897 FD_SET(rescan[0], &masterfds);
898 if (rescan[0] > masterhighest) masterhighest = rescan[0];
900 for (serviceptr = ServiceHookTable; serviceptr != NULL;
901 serviceptr = serviceptr->next ) {
902 m = serviceptr->msock;
903 lprintf(9, "Will listen on master socket %d\n", m);
904 FD_SET(m, &masterfds);
905 if (m > masterhighest) {
909 lprintf(9, "masterhighest = %d\n", masterhighest);
915 * Here's where it all begins.
917 int main(int argc, char **argv)
919 char tracefile[128]; /* Name of file to log traces to */
920 int a, i; /* General-purpose variables */
922 int drop_root_perms = 1;
924 struct worker_node *wnp;
926 /* specify default port name and trace file */
927 strcpy(tracefile, "");
929 /* initialize the master context */
930 InitializeMasterCC();
932 /* parse command-line arguments */
933 for (a=1; a<argc; ++a) {
935 /* -t specifies where to log trace messages to */
936 if (!strncmp(argv[a], "-t", 2)) {
937 strcpy(tracefile, argv[a]);
938 strcpy(tracefile, &tracefile[2]);
939 freopen(tracefile, "r", stdin);
940 freopen(tracefile, "w", stdout);
941 freopen(tracefile, "w", stderr);
944 /* run in the background if -d was specified */
945 else if (!strcmp(argv[a], "-d")) {
946 start_daemon( (strlen(tracefile) > 0) ? 0 : 1 ) ;
949 /* -x specifies the desired logging level */
950 else if (!strncmp(argv[a], "-x", 2)) {
951 verbosity = atoi(&argv[a][2]);
954 else if (!strncmp(argv[a], "-h", 2)) {
955 safestrncpy(bbs_home_directory, &argv[a][2],
956 sizeof bbs_home_directory);
960 else if (!strncmp(argv[a], "-f", 2)) {
964 /* -r tells the server not to drop root permissions. don't use
965 * this unless you know what you're doing. this should be
966 * removed in the next release if it proves unnecessary. */
967 else if (!strcmp(argv[a], "-r"))
970 /* any other parameter makes it crash and burn */
972 lprintf(1, "citserver: usage: "
973 "citserver [-tTraceFile] [-d] [-f]"
974 " [-xLogLevel] [-hHomeDir]\n");
980 /* Tell 'em who's in da house */
982 "\nMultithreaded message server for Citadel/UX\n"
983 "Copyright (C) 1987-2000 by the Citadel/UX development team.\n"
984 "Citadel/UX is free software, covered by the GNU General Public License, and\n"
985 "you are welcome to change it and/or distribute copies of it under certain\n"
986 "conditions. There is absolutely no warranty for this software. Please\n"
987 "read the 'COPYING.txt' file for details.\n\n");
991 openlog("citserver", LOG_PID, LOG_USER);
993 /* Load site-specific parameters */
994 lprintf(7, "Loading citadel.config\n");
999 * Do non system dependent startup functions.
1004 * Bind the server to a Unix-domain socket.
1006 CtdlRegisterServiceHook(0,
1008 citproto_begin_session,
1012 * Bind the server to our favorite TCP port (usually 504).
1014 CtdlRegisterServiceHook(config.c_port_number,
1016 citproto_begin_session,
1020 * Load any server-side modules (plugins) available here.
1022 lprintf(7, "Initializing loadable modules\n");
1023 if ((moddir = malloc(strlen(bbs_home_directory) + 9)) != NULL) {
1024 sprintf(moddir, "%s/modules", bbs_home_directory);
1025 DLoader_Init(moddir);
1030 * The rescan pipe exists so that worker threads can be woken up and
1031 * told to re-scan the context list for fd's to listen on. This is
1032 * necessary, for example, when a context is about to go idle and needs
1033 * to get back on that list.
1036 lprintf(1, "Can't create rescan pipe!\n");
1040 init_master_fdset();
1043 * Now that we've bound the sockets, change to the BBS user id and its
1044 * corresponding group ids
1046 if (drop_root_perms) {
1047 if ((pw = getpwuid(BBSUID)) == NULL)
1048 lprintf(1, "WARNING: getpwuid(%d): %s\n"
1049 "Group IDs will be incorrect.\n", BBSUID,
1052 initgroups(pw->pw_name, pw->pw_gid);
1053 if (setgid(pw->pw_gid))
1054 lprintf(3, "setgid(%d): %s\n", pw->pw_gid,
1057 lprintf(7, "Changing uid to %d\n", BBSUID);
1058 if (setuid(BBSUID) != 0) {
1059 lprintf(3, "setuid() failed: %s\n", strerror(errno));
1063 /* We want to check for idle sessions once per minute */
1064 CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
1067 * Now create a bunch of worker threads.
1069 lprintf(9, "Starting %d worker threads\n", config.c_min_workers-1);
1070 begin_critical_section(S_WORKER_LIST);
1071 for (i=0; i<(config.c_min_workers-1); ++i) {
1074 end_critical_section(S_WORKER_LIST);
1076 /* Now this thread can become a worker as well. */
1077 initial_thread = pthread_self();
1078 worker_thread(NULL);
1080 /* Server is exiting. Wait for workers to shutdown. */
1081 lprintf(7, "Waiting for worker threads to shut down\n");
1083 begin_critical_section(S_WORKER_LIST);
1084 while (worker_list != NULL) {
1086 worker_list = wnp->next;
1088 /* avoid deadlock with an exiting thread */
1089 end_critical_section(S_WORKER_LIST);
1090 if ((i = pthread_join(wnp->tid, NULL)))
1091 lprintf(1, "pthread_join: %s\n", strerror(i));
1093 begin_critical_section(S_WORKER_LIST);
1095 end_critical_section(S_WORKER_LIST);
1104 * Bind a thread to a context. (It's inline merely to speed things up.)
1106 inline void become_session(struct CitContext *which_con) {
1107 pthread_setspecific(MyConKey, (void *)which_con );
1113 * This loop just keeps going and going and going...
1115 void *worker_thread(void *arg) {
1119 struct CitContext *ptr;
1120 struct CitContext *bind_me = NULL;
1123 struct CitContext *con= NULL; /* Temporary context pointer */
1124 struct ServiceFunctionHook *serviceptr;
1125 struct sockaddr_in fsin; /* Data for master socket */
1126 int alen; /* Data for master socket */
1127 int ssock; /* Descriptor for client socket */
1134 while (!time_to_die) {
1137 * A naive implementation would have all idle threads
1138 * calling select() and then they'd all wake up at once. We
1139 * solve this problem by putting the select() in a critical
1140 * section, so only one thread has the opportunity to wake
1141 * up. If we wake up on a master socket, create a new
1142 * session context; otherwise, just bind the thread to the
1143 * context we want and go on our merry way.
1146 /* make doubly sure we're not holding any stale db handles
1147 * which might cause a deadlock.
1149 cdb_check_handles();
1151 begin_critical_section(S_I_WANNA_SELECT);
1152 SETUP_FD: memcpy(&readfds, &masterfds, sizeof masterfds);
1153 highest = masterhighest;
1154 begin_critical_section(S_SESSION_TABLE);
1155 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1156 if (ptr->state == CON_IDLE) {
1157 FD_SET(ptr->client_socket, &readfds);
1158 if (ptr->client_socket > highest)
1159 highest = ptr->client_socket;
1162 end_critical_section(S_SESSION_TABLE);
1164 tv.tv_sec = 1; /* wake up every second if no input */
1169 retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1171 end_critical_section(S_I_WANNA_SELECT);
1175 /* Now figure out who made this select() unblock.
1176 * First, check for an error or exit condition.
1179 if (errno != EINTR) {
1180 lprintf(9, "Exiting (%s)\n", strerror(errno));
1182 } else if (!time_to_die)
1186 /* Next, check to see if it's a new client connecting
1187 * on a master socket.
1189 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1190 serviceptr = serviceptr->next ) {
1192 if (FD_ISSET(serviceptr->msock, &readfds)) {
1194 ssock = accept(serviceptr->msock,
1195 (struct sockaddr *)&fsin, &alen);
1197 lprintf(2, "citserver: accept(): %s\n",
1201 lprintf(7, "citserver: "
1202 "New client socket %d\n",
1205 /* New context will be created already
1206 * set up in the CON_EXECUTING state.
1208 con = CreateNewContext();
1210 /* Assign new socket number to it. */
1211 con->client_socket = ssock;
1212 con->h_command_function =
1213 serviceptr->h_command_function;
1215 /* Determine whether local socket */
1216 if (serviceptr->sockpath != NULL)
1217 con->is_local_socket = 1;
1219 /* Set the SO_REUSEADDR socket option */
1221 setsockopt(ssock, SOL_SOCKET,
1225 become_session(con);
1227 serviceptr->h_greeting_function();
1228 become_session(NULL);
1229 con->state = CON_IDLE;
1235 /* If the rescan pipe went active, someone is telling this
1236 * thread that the &readfds needs to be refreshed with more
1240 end_critical_section(S_I_WANNA_SELECT);
1244 if (FD_ISSET(rescan[0], &readfds)) {
1245 read(rescan[0], &junk, 1);
1249 /* It must be a client socket. Find a context that has data
1250 * waiting on its socket *and* is in the CON_IDLE state.
1254 begin_critical_section(S_SESSION_TABLE);
1255 for (ptr = ContextList;
1256 ( (ptr != NULL) && (bind_me == NULL) );
1258 if ( (FD_ISSET(ptr->client_socket, &readfds))
1259 && (ptr->state == CON_IDLE) ) {
1263 if (bind_me != NULL) {
1264 /* Found one. Stake a claim to it before
1265 * letting anyone else touch the context list.
1267 bind_me->state = CON_EXECUTING;
1270 end_critical_section(S_SESSION_TABLE);
1271 end_critical_section(S_I_WANNA_SELECT);
1273 /* We're bound to a session, now do *one* command */
1274 if (bind_me != NULL) {
1275 become_session(bind_me);
1276 CC->h_command_function();
1277 become_session(NULL);
1278 bind_me->state = CON_IDLE;
1279 if (bind_me->kill_me == 1) {
1280 RemoveContext(bind_me);
1282 write(rescan[1], &junk, 1);
1286 dead_session_purge();
1287 if ((time(NULL) - last_timer) > 60L) {
1288 last_timer = time(NULL);
1289 cdb_check_handles(); /* suggested by Justin Case */
1290 PerformSessionHooks(EVT_TIMER);
1293 check_sched_shutdown();
1296 /* If control reaches this point, the server is shutting down */