2 * Citadel/UX "system dependent" stuff.
3 * See copyright.txt for copyright information.
7 * Here's where we (hopefully) have all the parts of the Citadel server that
8 * would need to be altered to run the server in a non-POSIX environment.
10 * Eventually we'll try porting to a different platform and either have
11 * multiple variants of this file or simply load it up with #ifdefs.
22 #include <sys/types.h>
24 #include <sys/socket.h>
27 #include <netinet/in.h>
44 #include "sysdep_decls.h"
45 #include "citserver.h"
49 #include "housekeeping.h"
50 #include "dynloader.h"
53 #ifdef HAVE_SYS_SELECT_H
54 #include <sys/select.h>
61 #ifdef DEBUG_MEMORY_LEAKS
62 struct TheHeap *heap = NULL;
65 pthread_mutex_t Critters[MAX_SEMAPHORES]; /* Things needing locking */
66 pthread_key_t MyConKey; /* TSD key for MyContext() */
68 int verbosity = DEFAULT_VERBOSITY; /* Logging level */
70 struct CitContext masterCC;
71 int rescan[2]; /* The Rescan Pipe */
72 time_t last_purge = 0; /* Last dead session purge */
73 int num_threads = 0; /* Current number of threads */
74 int num_sessions = 0; /* Current number of sessions */
76 fd_set masterfds; /* Master sockets etc. */
79 time_t last_timer = 0L; /* Last timer hook processing */
83 * lprintf() ... Write logging information
85 void lprintf(int loglevel, const char *format, ...) {
89 va_start(arg_ptr, format);
90 vsprintf(buf, format, arg_ptr);
93 if (loglevel <= verbosity) {
94 fprintf(stderr, "%s", buf);
98 PerformLogHooks(loglevel, buf);
103 #ifdef DEBUG_MEMORY_LEAKS
104 void *tracked_malloc(size_t tsize, char *tfile, int tline) {
106 struct TheHeap *hptr;
110 lprintf(3, "DANGER! mallok(%d) at %s:%d failed!\n",
111 tsize, tfile, tline);
115 hptr = (struct TheHeap *) malloc(sizeof(struct TheHeap));
116 strcpy(hptr->h_file, tfile);
117 hptr->h_line = tline;
124 char *tracked_strdup(const char *orig, char *tfile, int tline) {
127 s = tracked_malloc( (strlen(orig)+1), tfile, tline);
128 if (s == NULL) return NULL;
134 void tracked_free(void *ptr) {
135 struct TheHeap *hptr, *freeme;
137 if (heap->h_ptr == ptr) {
143 for (hptr=heap; hptr->next!=NULL; hptr=hptr->next) {
144 if (hptr->next->h_ptr == ptr) {
146 hptr->next = hptr->next->next;
155 void *tracked_realloc(void *ptr, size_t size) {
157 struct TheHeap *hptr;
159 newptr = realloc(ptr, size);
161 for (hptr=heap; hptr!=NULL; hptr=hptr->next) {
162 if (hptr->h_ptr == ptr) hptr->h_ptr = newptr;
169 void dump_tracked() {
170 struct TheHeap *hptr;
172 cprintf("%d Here's what's allocated...\n", LISTING_FOLLOWS);
173 for (hptr=heap; hptr!=NULL; hptr=hptr->next) {
174 cprintf("%20s %5d\n",
175 hptr->h_file, hptr->h_line);
187 * we used to use master_cleanup() as a signal handler to shut down the server.
188 * however, master_cleanup() and the functions it calls do some things that
189 * aren't such a good idea to do from a signal handler: acquiring mutexes,
190 * playing with signal masks on BSDI systems, etc. so instead we install the
191 * following signal handler to set a global variable to inform the main loop
192 * that it's time to call master_cleanup() and exit.
195 static volatile int time_to_die = 0;
197 static RETSIGTYPE signal_cleanup(int signum) {
203 * Some initialization stuff...
205 void init_sysdep(void) {
208 /* Set up a bunch of semaphores to be used for critical sections */
209 for (a=0; a<MAX_SEMAPHORES; ++a) {
210 pthread_mutex_init(&Critters[a], NULL);
214 * Set up a place to put thread-specific data.
215 * We only need a single pointer per thread - it points to the
216 * thread's CitContext structure in the ContextList linked list.
218 if (pthread_key_create(&MyConKey, NULL) != 0) {
219 lprintf(1, "Can't create TSD key!! %s\n", strerror(errno));
223 * The action for unexpected signals and exceptions should be to
224 * call signal_cleanup() to gracefully shut down the server.
226 signal(SIGINT, signal_cleanup);
227 signal(SIGQUIT, signal_cleanup);
228 signal(SIGHUP, signal_cleanup);
229 signal(SIGTERM, signal_cleanup);
232 * Do not shut down the server on broken pipe signals, otherwise the
233 * whole Citadel service would come down whenever a single client
236 signal(SIGPIPE, SIG_IGN);
241 * Obtain a semaphore lock to begin a critical section.
243 void begin_critical_section(int which_one)
245 /* lprintf(9, "begin_critical_section(%d)\n", which_one); */
246 pthread_mutex_lock(&Critters[which_one]);
250 * Release a semaphore lock to end a critical section.
252 void end_critical_section(int which_one)
254 /* lprintf(9, "end_critical_section(%d)\n", which_one); */
255 pthread_mutex_unlock(&Critters[which_one]);
261 * This is a generic function to set up a master socket for listening on
262 * a TCP port. The server shuts down if the bind fails.
265 int ig_tcp_server(int port_number, int queue_len)
267 struct sockaddr_in sin;
270 memset(&sin, 0, sizeof(sin));
271 sin.sin_family = AF_INET;
272 sin.sin_addr.s_addr = INADDR_ANY;
273 sin.sin_port = htons((u_short)port_number);
275 s = socket(PF_INET, SOCK_STREAM,
276 (getprotobyname("tcp")->p_proto));
279 lprintf(1, "citserver: Can't create a socket: %s\n",
285 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
287 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
288 lprintf(1, "citserver: Can't bind: %s\n",
293 if (listen(s, queue_len) < 0) {
294 lprintf(1, "citserver: Can't listen: %s\n", strerror(errno));
304 * Create a Unix domain socket and listen on it
306 int ig_uds_server(char *sockpath, int queue_len)
308 struct sockaddr_un addr;
313 memset(&addr, 0, sizeof(addr));
314 addr.sun_family = AF_UNIX;
315 safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
317 s = socket(AF_UNIX, SOCK_STREAM, 0);
319 lprintf(1, "citserver: Can't create a socket: %s\n",
324 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
325 lprintf(1, "citserver: Can't bind: %s\n",
330 if (listen(s, queue_len) < 0) {
331 lprintf(1, "citserver: Can't listen: %s\n", strerror(errno));
341 * Return a pointer to the CitContext structure bound to the thread which
342 * called this function. If there's no such binding (for example, if it's
343 * called by the housekeeper thread) then a generic 'master' CC is returned.
345 struct CitContext *MyContext(void) {
346 struct CitContext *retCC;
347 retCC = (struct CitContext *) pthread_getspecific(MyConKey);
348 if (retCC == NULL) retCC = &masterCC;
354 * Initialize a new context and place it in the list.
356 struct CitContext *CreateNewContext(void) {
357 struct CitContext *me, *ptr;
361 me = (struct CitContext *) mallok(sizeof(struct CitContext));
363 lprintf(1, "citserver: can't allocate memory!!\n");
366 memset(me, 0, sizeof(struct CitContext));
368 /* The new context will be created already in the CON_EXECUTING state
369 * in order to prevent another thread from grabbing it while it's
372 me->state = CON_EXECUTING;
374 begin_critical_section(S_SESSION_TABLE);
376 /* obtain a unique session number */
379 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
380 if (ptr->cs_pid == num) {
385 } while (startover == 1);
388 me->next = ContextList;
392 end_critical_section(S_SESSION_TABLE);
399 * client_write() ... Send binary data to the client.
401 void client_write(char *buf, int nbytes)
403 int bytes_written = 0;
407 if (CC->redirect_fp != NULL) {
408 fwrite(buf, nbytes, 1, CC->redirect_fp);
412 if (CC->redirect_sock > 0) {
413 sock = CC->redirect_sock; /* and continue below... */
416 sock = CC->client_socket;
419 while (bytes_written < nbytes) {
420 retval = write(sock, &buf[bytes_written],
421 nbytes - bytes_written);
423 lprintf(2, "client_write() failed: %s\n",
425 if (sock == CC->client_socket) CC->kill_me = 1;
428 bytes_written = bytes_written + retval;
434 * cprintf() ... Send formatted printable data to the client. It is
435 * implemented in terms of client_write() but remains in
436 * sysdep.c in case we port to somewhere without va_args...
438 void cprintf(const char *format, ...) {
442 va_start(arg_ptr, format);
443 if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
444 buf[sizeof buf - 2] = '\n';
445 client_write(buf, strlen(buf));
451 * Read data from the client socket.
453 * 1 Requested number of bytes has been read.
454 * 0 Request timed out.
455 * -1 The socket is broken.
456 * If the socket breaks, the session will be terminated.
458 int client_read_to(char *buf, int bytes, int timeout)
468 FD_SET(CC->client_socket, &rfds);
472 retval = select( (CC->client_socket)+1,
473 &rfds, NULL, NULL, &tv);
475 if (FD_ISSET(CC->client_socket, &rfds) == 0) {
479 rlen = read(CC->client_socket, &buf[len], bytes-len);
481 lprintf(2, "client_read() failed: %s\n",
492 * Read data from the client socket with default timeout.
493 * (This is implemented in terms of client_read_to() and could be
494 * justifiably moved out of sysdep.c)
496 int client_read(char *buf, int bytes)
498 return(client_read_to(buf, bytes, config.c_sleeping));
503 * client_gets() ... Get a LF-terminated line of text from the client.
504 * (This is implemented in terms of client_read() and could be
505 * justifiably moved out of sysdep.c)
507 int client_gets(char *buf)
511 /* Read one character at a time.
514 retval = client_read(&buf[i], 1);
515 if (retval != 1 || buf[i] == '\n' || i == 255)
519 /* If we got a long line, discard characters until the newline.
522 while (buf[i] != '\n' && retval == 1)
523 retval = client_read(&buf[i], 1);
525 /* Strip the trailing newline and any trailing nonprintables (cr's)
528 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
529 buf[strlen(buf)-1] = 0;
536 * The system-dependent part of master_cleanup() - close the master socket.
538 void sysdep_master_cleanup(void) {
539 struct ServiceFunctionHook *serviceptr;
542 * close all protocol master sockets
544 for (serviceptr = ServiceHookTable; serviceptr != NULL;
545 serviceptr = serviceptr->next ) {
546 lprintf(3, "Closing listener on port %d\n",
547 serviceptr->tcp_port);
548 close(serviceptr->msock);
550 /* If it's a Unix domain socket, remove the file. */
551 if (serviceptr->sockpath != NULL) {
552 unlink(serviceptr->sockpath);
559 * Terminate another session.
560 * (This could justifiably be moved out of sysdep.c because it
561 * no longer does anything that is system-dependent.)
563 void kill_session(int session_to_kill) {
564 struct CitContext *ptr;
566 begin_critical_section(S_SESSION_TABLE);
567 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
568 if (ptr->cs_pid == session_to_kill) {
572 end_critical_section(S_SESSION_TABLE);
579 * Start running as a daemon. Only close stdio if do_close_stdio is set.
581 void start_daemon(int do_close_stdio) {
582 if (do_close_stdio) {
587 signal(SIGHUP,SIG_IGN);
588 signal(SIGINT,SIG_IGN);
589 signal(SIGQUIT,SIG_IGN);
590 if (fork()!=0) exit(0);
596 * Tie in to the 'netsetup' program.
598 * (We're going to hope that netsetup never feeds more than 4096 bytes back.)
600 void cmd_nset(char *cmdbuf)
607 char netsetup_args[3][256];
609 if (CC->usersupp.axlevel < 6) {
610 cprintf("%d Higher access required.\n",
611 ERROR + HIGHER_ACCESS_REQUIRED);
615 for (a=1; a<=3; ++a) {
616 if (num_parms(cmdbuf) >= a) {
617 extract(netsetup_args[a-1], cmdbuf, a-1);
618 for (b=0; b<strlen(netsetup_args[a-1]); ++b) {
619 if (netsetup_args[a-1][b] == 34) {
620 netsetup_args[a-1][b] = '_';
625 netsetup_args[a-1][0] = 0;
629 sprintf(fbuf, "./netsetup \"%s\" \"%s\" \"%s\" </dev/null 2>&1",
630 netsetup_args[0], netsetup_args[1], netsetup_args[2]);
631 netsetup = popen(fbuf, "r");
632 if (netsetup == NULL) {
633 cprintf("%d %s\n", ERROR, strerror(errno));
638 while (ch = getc(netsetup), (ch > 0)) {
639 fbuf[strlen(fbuf)+1] = 0;
640 fbuf[strlen(fbuf)] = ch;
643 retcode = pclose(netsetup);
646 for (a=0; a<strlen(fbuf); ++a) {
647 if (fbuf[a] < 32) fbuf[a] = 32;
650 cprintf("%d %s\n", ERROR, fbuf);
654 cprintf("%d Command succeeded. Output follows:\n", LISTING_FOLLOWS);
656 if (fbuf[strlen(fbuf)-1] != 10) cprintf("\n");
663 * Generic routine to convert a login name to a full name (gecos)
664 * Returns nonzero if a conversion took place
666 int convert_login(char NameToConvert[]) {
670 pw = getpwnam(NameToConvert);
675 strcpy(NameToConvert, pw->pw_gecos);
676 for (a=0; a<strlen(NameToConvert); ++a) {
677 if (NameToConvert[a] == ',') NameToConvert[a] = 0;
686 * Purge all sessions which have the 'kill_me' flag set.
687 * This function has code to prevent it from running more than once every
688 * few seconds, because running it after every single unbind would waste a lot
689 * of CPU time and keep the context list locked too much.
691 * After that's done, we raise or lower the size of the worker thread pool
692 * if such an action is appropriate.
694 void dead_session_purge(void) {
695 struct CitContext *ptr, *rem;
699 if ( (time(NULL) - last_purge) < 5 ) return; /* Too soon, go away */
704 begin_critical_section(S_SESSION_TABLE);
705 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
706 if ( (ptr->state == CON_IDLE) && (ptr->kill_me) ) {
710 end_critical_section(S_SESSION_TABLE);
712 /* RemoveContext() enters its own S_SESSION_TABLE critical
713 * section, so we have to do it like this.
716 lprintf(9, "Purging session %d\n", rem->cs_pid);
720 } while (rem != NULL);
723 /* Raise or lower the size of the worker thread pool if such
724 * an action is appropriate.
727 if ( (num_sessions > num_threads)
728 && (num_threads < config.c_max_workers) ) {
730 pthread_attr_init(&attr);
731 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
732 if (pthread_create(&newthread, &attr,
733 (void* (*)(void*)) worker_thread, NULL) != 0) {
734 lprintf(1, "Can't create worker thead: %s\n",
740 else if ( (num_sessions < num_threads)
741 && (num_threads > config.c_min_workers) ) {
753 * Redirect a session's output to a file or socket.
754 * This function may be called with a file handle *or* a socket (but not
755 * both). Call with neither to return output to its normal client socket.
757 void CtdlRedirectOutput(FILE *fp, int sock) {
759 if (fp != NULL) CC->redirect_fp = fp;
760 else CC->redirect_fp = NULL;
762 if (sock > 0) CC->redirect_sock = sock;
763 else CC->redirect_sock = (-1);
769 * masterCC is the context we use when not attached to a session. This
770 * function initializes it.
772 void InitializeMasterCC(void) {
773 memset(&masterCC, 0, sizeof(struct CitContext));
774 masterCC.internal_pgm = 1;
780 * Here's where it all begins.
782 int main(int argc, char **argv)
784 pthread_t HousekeepingThread; /* Thread descriptor */
785 pthread_attr_t attr; /* Thread attributes */
786 char tracefile[128]; /* Name of file to log traces to */
787 int a, i; /* General-purpose variables */
789 int drop_root_perms = 1;
791 struct ServiceFunctionHook *serviceptr;
793 /* specify default port name and trace file */
794 strcpy(tracefile, "");
796 /* initialize the master context */
797 InitializeMasterCC();
799 /* parse command-line arguments */
800 for (a=1; a<argc; ++a) {
802 /* -t specifies where to log trace messages to */
803 if (!strncmp(argv[a], "-t", 2)) {
804 strcpy(tracefile, argv[a]);
805 strcpy(tracefile, &tracefile[2]);
806 freopen(tracefile, "r", stdin);
807 freopen(tracefile, "w", stdout);
808 freopen(tracefile, "w", stderr);
811 /* run in the background if -d was specified */
812 else if (!strcmp(argv[a], "-d")) {
813 start_daemon( (strlen(tracefile) > 0) ? 0 : 1 ) ;
816 /* -x specifies the desired logging level */
817 else if (!strncmp(argv[a], "-x", 2)) {
818 verbosity = atoi(&argv[a][2]);
821 else if (!strncmp(argv[a], "-h", 2)) {
822 safestrncpy(bbs_home_directory, &argv[a][2],
823 sizeof bbs_home_directory);
827 else if (!strncmp(argv[a], "-f", 2)) {
831 /* -r tells the server not to drop root permissions. don't use
832 * this unless you know what you're doing. this should be
833 * removed in the next release if it proves unnecessary. */
834 else if (!strcmp(argv[a], "-r"))
837 /* any other parameter makes it crash and burn */
839 lprintf(1, "citserver: usage: "
840 "citserver [-tTraceFile] [-d] [-f]"
841 " [-xLogLevel] [-hHomeDir]\n");
847 /* Tell 'em who's in da house */
849 "\nMultithreaded message server for Citadel/UX\n"
850 "Copyright (C) 1987-1999 by the Citadel/UX development team.\n"
851 "Citadel/UX is free software, covered by the GNU General Public License, and\n"
852 "you are welcome to change it and/or distribute copies of it under certain\n"
853 "conditions. There is absolutely no warranty for this software. Please\n"
854 "read the 'COPYING.txt' file for details.\n\n");
858 openlog("citserver",LOG_PID,LOG_USER);
860 /* Load site-specific parameters */
861 lprintf(7, "Loading citadel.config\n");
865 * Do non system dependent startup functions.
870 * Bind the server to our favorite ports.
872 CtdlRegisterServiceHook(config.c_port_number, /* TCP */
874 citproto_begin_session,
876 CtdlRegisterServiceHook(0, /* TCP */
878 citproto_begin_session,
882 * Load any server-side modules (plugins) available here.
884 lprintf(7, "Initializing loadable modules\n");
885 if ((moddir = malloc(strlen(bbs_home_directory) + 9)) != NULL) {
886 sprintf(moddir, "%s/modules", bbs_home_directory);
887 DLoader_Init(moddir);
892 * The rescan pipe exists so that worker threads can be woken up and
893 * told to re-scan the context list for fd's to listen on. This is
894 * necessary, for example, when a context is about to go idle and needs
895 * to get back on that list.
898 lprintf(1, "Can't create rescan pipe!\n");
903 * Set up a fd_set containing all the master sockets to which we
904 * always listen. It's computationally less expensive to just copy
905 * this to a local fd_set when starting a new select() and then add
906 * the client sockets than it is to initialize a new one and then
907 * figure out what to put there.
911 FD_SET(rescan[0], &masterfds);
912 if (rescan[0] > masterhighest) masterhighest = rescan[0];
914 for (serviceptr = ServiceHookTable; serviceptr != NULL;
915 serviceptr = serviceptr->next ) {
916 FD_SET(serviceptr->msock, &masterfds);
917 if (serviceptr->msock > masterhighest) {
918 masterhighest = serviceptr->msock;
924 * Now that we've bound the sockets, change to the BBS user id and its
925 * corresponding group ids
927 if (drop_root_perms) {
928 if ((pw = getpwuid(BBSUID)) == NULL)
929 lprintf(1, "WARNING: getpwuid(%d): %s\n"
930 "Group IDs will be incorrect.\n", BBSUID,
933 initgroups(pw->pw_name, pw->pw_gid);
934 if (setgid(pw->pw_gid))
935 lprintf(3, "setgid(%d): %s\n", pw->pw_gid,
938 lprintf(7, "Changing uid to %d\n", BBSUID);
939 if (setuid(BBSUID) != 0) {
940 lprintf(3, "setuid() failed: %s\n", strerror(errno));
945 * Create the housekeeper thread
947 lprintf(7, "Starting housekeeper thread\n");
948 pthread_attr_init(&attr);
949 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
950 if (pthread_create(&HousekeepingThread, &attr,
951 (void* (*)(void*)) housekeeping_loop, NULL) != 0) {
952 lprintf(1, "Can't create housekeeping thead: %s\n",
958 * Now create a bunch of worker threads.
960 for (i=0; i<(config.c_min_workers-1); ++i) {
961 pthread_attr_init(&attr);
962 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
963 if (pthread_create(&HousekeepingThread, &attr,
964 (void* (*)(void*)) worker_thread, NULL) != 0) {
965 lprintf(1, "Can't create worker thead: %s\n",
970 /* Now this thread can become a worker as well. */
978 * Bind a thread to a context.
980 inline void become_session(struct CitContext *which_con) {
981 pthread_setspecific(MyConKey, (void *)which_con );
987 * This loop just keeps going and going and going...
989 void worker_thread(void) {
993 struct CitContext *ptr;
994 struct CitContext *bind_me = NULL;
997 struct CitContext *con= NULL; /* Temporary context pointer */
998 struct ServiceFunctionHook *serviceptr;
999 struct sockaddr_in fsin; /* Data for master socket */
1000 int alen; /* Data for master socket */
1001 int ssock; /* Descriptor for client socket */
1006 while (!time_to_die) {
1009 * A naive implementation would have all idle threads
1010 * calling select() and then they'd all wake up at once. We
1011 * solve this problem by putting the select() in a critical
1012 * section, so only one thread has the opportunity to wake
1013 * up. If we wake up on the master socket, create a new
1014 * session context; otherwise, just bind the thread to the
1015 * context we want and go on our merry way.
1018 begin_critical_section(S_I_WANNA_SELECT);
1019 SETUP_FD: memcpy(&readfds, &masterfds, sizeof(fd_set) );
1020 highest = masterhighest;
1021 begin_critical_section(S_SESSION_TABLE);
1022 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1023 if (ptr->state == CON_IDLE) {
1024 FD_SET(ptr->client_socket, &readfds);
1025 if (ptr->client_socket > highest)
1026 highest = ptr->client_socket;
1029 end_critical_section(S_SESSION_TABLE);
1031 tv.tv_sec = 60; /* wake up every minute if no input */
1033 retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1035 /* Now figure out who made this select() unblock.
1036 * First, check for an error or exit condition.
1039 end_critical_section(S_I_WANNA_SELECT);
1040 lprintf(9, "Exiting (%s)\n", strerror(errno));
1044 /* Next, check to see if it's a new client connecting
1045 * on the master socket.
1047 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1048 serviceptr = serviceptr->next ) {
1050 if (FD_ISSET(serviceptr->msock, &readfds)) {
1052 ssock = accept(serviceptr->msock,
1053 (struct sockaddr *)&fsin, &alen);
1055 lprintf(2, "citserver: accept(): %s\n",
1059 lprintf(7, "citserver: "
1060 "New client socket %d\n",
1063 /* New context will be created already
1064 * set up in the CON_EXECUTING state.
1066 con = CreateNewContext();
1068 /* Assign new socket number to it. */
1069 con->client_socket = ssock;
1070 con->h_command_function =
1071 serviceptr->h_command_function;
1073 /* Set the SO_REUSEADDR socket option */
1075 setsockopt(ssock, SOL_SOCKET,
1079 become_session(con);
1081 serviceptr->h_greeting_function();
1082 become_session(NULL);
1083 con->state = CON_IDLE;
1089 /* If the rescan pipe went active, someone is telling this
1090 * thread that the &readfds needs to be refreshed with more
1093 if (!time_to_die) if (FD_ISSET(rescan[0], &readfds)) {
1094 read(rescan[0], &junk, 1);
1098 /* It must be a client socket. Find a context that has data
1099 * waiting on its socket *and* is in the CON_IDLE state.
1103 begin_critical_section(S_SESSION_TABLE);
1104 for (ptr = ContextList;
1105 ( (ptr != NULL) && (bind_me == NULL) );
1107 if ( (FD_ISSET(ptr->client_socket, &readfds))
1108 && (ptr->state == CON_IDLE) ) {
1112 if (bind_me != NULL) {
1113 /* Found one. Stake a claim to it before
1114 * letting anyone else touch the context list.
1116 bind_me->state = CON_EXECUTING;
1119 end_critical_section(S_SESSION_TABLE);
1120 end_critical_section(S_I_WANNA_SELECT);
1122 /* We're bound to a session, now do *one* command */
1123 if (bind_me != NULL) {
1124 become_session(bind_me);
1125 CC->h_command_function();
1126 become_session(NULL);
1127 bind_me->state = CON_IDLE;
1128 if (bind_me->kill_me == 1) {
1129 RemoveContext(bind_me);
1131 write(rescan[1], &junk, 1);
1135 dead_session_purge();
1136 if ((time(NULL) - last_timer) > 60L) {
1137 last_timer = time(NULL);
1138 PerformSessionHooks(EVT_TIMER);
1142 /* If control reaches this point, the server is shutting down */