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.
264 * If a negative number is specified, a Unix domain socket is created.
266 int ig_tcp_server(int port_number, int queue_len)
268 struct sockaddr_in sin;
269 struct sockaddr_un addr;
273 if (port_number < 0) {
278 memset(&addr, 0, sizeof(addr));
279 addr.sun_family = AF_UNIX;
280 sprintf(addr.sun_path, USOCKPATH, 0-port_number);
283 memset(&sin, 0, sizeof(sin));
284 sin.sin_family = AF_INET;
285 sin.sin_addr.s_addr = INADDR_ANY;
286 sin.sin_port = htons((u_short)port_number);
290 s = socket(AF_UNIX, SOCK_STREAM, 0);
293 s = socket(PF_INET, SOCK_STREAM,
294 (getprotobyname("tcp")->p_proto));
298 lprintf(1, "citserver: Can't create a socket: %s\n",
303 /* Set the SO_REUSEADDR socket option, because it makes sense. */
306 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
310 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
311 lprintf(1, "citserver: Can't bind: %s\n",
317 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
318 lprintf(1, "citserver: Can't bind: %s\n",
324 if (listen(s, queue_len) < 0) {
325 lprintf(1, "citserver: Can't listen: %s\n", strerror(errno));
335 * Return a pointer to the CitContext structure bound to the thread which
336 * called this function. If there's no such binding (for example, if it's
337 * called by the housekeeper thread) then a generic 'master' CC is returned.
339 struct CitContext *MyContext(void) {
340 struct CitContext *retCC;
341 retCC = (struct CitContext *) pthread_getspecific(MyConKey);
342 if (retCC == NULL) retCC = &masterCC;
348 * Initialize a new context and place it in the list.
350 struct CitContext *CreateNewContext(void) {
351 struct CitContext *me, *ptr;
355 me = (struct CitContext *) mallok(sizeof(struct CitContext));
357 lprintf(1, "citserver: can't allocate memory!!\n");
360 memset(me, 0, sizeof(struct CitContext));
362 /* The new context will be created already in the CON_EXECUTING state
363 * in order to prevent another thread from grabbing it while it's
366 me->state = CON_EXECUTING;
368 begin_critical_section(S_SESSION_TABLE);
370 /* obtain a unique session number */
373 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
374 if (ptr->cs_pid == num) {
379 } while (startover == 1);
382 me->next = ContextList;
386 end_critical_section(S_SESSION_TABLE);
393 * client_write() ... Send binary data to the client.
395 void client_write(char *buf, int nbytes)
397 int bytes_written = 0;
401 if (CC->redirect_fp != NULL) {
402 fwrite(buf, nbytes, 1, CC->redirect_fp);
406 if (CC->redirect_sock > 0) {
407 sock = CC->redirect_sock; /* and continue below... */
410 sock = CC->client_socket;
413 while (bytes_written < nbytes) {
414 retval = write(sock, &buf[bytes_written],
415 nbytes - bytes_written);
417 lprintf(2, "client_write() failed: %s\n",
419 if (sock == CC->client_socket) CC->kill_me = 1;
422 bytes_written = bytes_written + retval;
428 * cprintf() ... Send formatted printable data to the client. It is
429 * implemented in terms of client_write() but remains in
430 * sysdep.c in case we port to somewhere without va_args...
432 void cprintf(const char *format, ...) {
436 va_start(arg_ptr, format);
437 if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
438 buf[sizeof buf - 2] = '\n';
439 client_write(buf, strlen(buf));
445 * Read data from the client socket.
447 * 1 Requested number of bytes has been read.
448 * 0 Request timed out.
449 * -1 The socket is broken.
450 * If the socket breaks, the session will be terminated.
452 int client_read_to(char *buf, int bytes, int timeout)
462 FD_SET(CC->client_socket, &rfds);
466 retval = select( (CC->client_socket)+1,
467 &rfds, NULL, NULL, &tv);
469 if (FD_ISSET(CC->client_socket, &rfds) == 0) {
473 rlen = read(CC->client_socket, &buf[len], bytes-len);
475 lprintf(2, "client_read() failed: %s\n",
486 * Read data from the client socket with default timeout.
487 * (This is implemented in terms of client_read_to() and could be
488 * justifiably moved out of sysdep.c)
490 int client_read(char *buf, int bytes)
492 return(client_read_to(buf, bytes, config.c_sleeping));
497 * client_gets() ... Get a LF-terminated line of text from the client.
498 * (This is implemented in terms of client_read() and could be
499 * justifiably moved out of sysdep.c)
501 int client_gets(char *buf)
505 /* Read one character at a time.
508 retval = client_read(&buf[i], 1);
509 if (retval != 1 || buf[i] == '\n' || i == 255)
513 /* If we got a long line, discard characters until the newline.
516 while (buf[i] != '\n' && retval == 1)
517 retval = client_read(&buf[i], 1);
519 /* Strip the trailing newline and any trailing nonprintables (cr's)
522 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
523 buf[strlen(buf)-1] = 0;
530 * The system-dependent part of master_cleanup() - close the master socket.
532 void sysdep_master_cleanup(void) {
533 struct ServiceFunctionHook *serviceptr;
537 * close all protocol master sockets
539 for (serviceptr = ServiceHookTable; serviceptr != NULL;
540 serviceptr = serviceptr->next ) {
541 lprintf(3, "Closing listener on port %d\n",
542 serviceptr->tcp_port);
543 close(serviceptr->msock);
545 /* If it's a Unix domain socket, remove the file. */
546 if (serviceptr->tcp_port < 0) {
547 sprintf(sockpath, USOCKPATH, 0-(serviceptr->tcp_port));
548 lprintf(9, "Removing <%s>\n", sockpath);
556 * Terminate another session.
557 * (This could justifiably be moved out of sysdep.c because it
558 * no longer does anything that is system-dependent.)
560 void kill_session(int session_to_kill) {
561 struct CitContext *ptr;
563 begin_critical_section(S_SESSION_TABLE);
564 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
565 if (ptr->cs_pid == session_to_kill) {
569 end_critical_section(S_SESSION_TABLE);
576 * Start running as a daemon. Only close stdio if do_close_stdio is set.
578 void start_daemon(int do_close_stdio) {
579 if (do_close_stdio) {
584 signal(SIGHUP,SIG_IGN);
585 signal(SIGINT,SIG_IGN);
586 signal(SIGQUIT,SIG_IGN);
587 if (fork()!=0) exit(0);
593 * Tie in to the 'netsetup' program.
595 * (We're going to hope that netsetup never feeds more than 4096 bytes back.)
597 void cmd_nset(char *cmdbuf)
604 char netsetup_args[3][256];
606 if (CC->usersupp.axlevel < 6) {
607 cprintf("%d Higher access required.\n",
608 ERROR + HIGHER_ACCESS_REQUIRED);
612 for (a=1; a<=3; ++a) {
613 if (num_parms(cmdbuf) >= a) {
614 extract(netsetup_args[a-1], cmdbuf, a-1);
615 for (b=0; b<strlen(netsetup_args[a-1]); ++b) {
616 if (netsetup_args[a-1][b] == 34) {
617 netsetup_args[a-1][b] = '_';
622 netsetup_args[a-1][0] = 0;
626 sprintf(fbuf, "./netsetup \"%s\" \"%s\" \"%s\" </dev/null 2>&1",
627 netsetup_args[0], netsetup_args[1], netsetup_args[2]);
628 netsetup = popen(fbuf, "r");
629 if (netsetup == NULL) {
630 cprintf("%d %s\n", ERROR, strerror(errno));
635 while (ch = getc(netsetup), (ch > 0)) {
636 fbuf[strlen(fbuf)+1] = 0;
637 fbuf[strlen(fbuf)] = ch;
640 retcode = pclose(netsetup);
643 for (a=0; a<strlen(fbuf); ++a) {
644 if (fbuf[a] < 32) fbuf[a] = 32;
647 cprintf("%d %s\n", ERROR, fbuf);
651 cprintf("%d Command succeeded. Output follows:\n", LISTING_FOLLOWS);
653 if (fbuf[strlen(fbuf)-1] != 10) cprintf("\n");
660 * Generic routine to convert a login name to a full name (gecos)
661 * Returns nonzero if a conversion took place
663 int convert_login(char NameToConvert[]) {
667 pw = getpwnam(NameToConvert);
672 strcpy(NameToConvert, pw->pw_gecos);
673 for (a=0; a<strlen(NameToConvert); ++a) {
674 if (NameToConvert[a] == ',') NameToConvert[a] = 0;
683 * Purge all sessions which have the 'kill_me' flag set.
684 * This function has code to prevent it from running more than once every
685 * few seconds, because running it after every single unbind would waste a lot
686 * of CPU time and keep the context list locked too much.
688 * After that's done, we raise or lower the size of the worker thread pool
689 * if such an action is appropriate.
691 void dead_session_purge(void) {
692 struct CitContext *ptr, *rem;
696 if ( (time(NULL) - last_purge) < 5 ) return; /* Too soon, go away */
701 begin_critical_section(S_SESSION_TABLE);
702 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
703 if ( (ptr->state == CON_IDLE) && (ptr->kill_me) ) {
707 end_critical_section(S_SESSION_TABLE);
709 /* RemoveContext() enters its own S_SESSION_TABLE critical
710 * section, so we have to do it like this.
713 lprintf(9, "Purging session %d\n", rem->cs_pid);
717 } while (rem != NULL);
720 /* Raise or lower the size of the worker thread pool if such
721 * an action is appropriate.
724 if ( (num_sessions > num_threads)
725 && (num_threads < config.c_max_workers) ) {
727 pthread_attr_init(&attr);
728 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
729 if (pthread_create(&newthread, &attr,
730 (void* (*)(void*)) worker_thread, NULL) != 0) {
731 lprintf(1, "Can't create worker thead: %s\n",
737 else if ( (num_sessions < num_threads)
738 && (num_threads > config.c_min_workers) ) {
750 * Redirect a session's output to a file or socket.
751 * This function may be called with a file handle *or* a socket (but not
752 * both). Call with neither to return output to its normal client socket.
754 void CtdlRedirectOutput(FILE *fp, int sock) {
756 if (fp != NULL) CC->redirect_fp = fp;
757 else CC->redirect_fp = NULL;
759 if (sock > 0) CC->redirect_sock = sock;
760 else CC->redirect_sock = (-1);
766 * masterCC is the context we use when not attached to a session. This
767 * function initializes it.
769 void InitializeMasterCC(void) {
770 memset(&masterCC, 0, sizeof(struct CitContext));
771 masterCC.internal_pgm = 1;
777 * Here's where it all begins.
779 int main(int argc, char **argv)
781 pthread_t HousekeepingThread; /* Thread descriptor */
782 pthread_attr_t attr; /* Thread attributes */
783 char tracefile[128]; /* Name of file to log traces to */
784 int a, i; /* General-purpose variables */
786 int drop_root_perms = 1;
788 struct ServiceFunctionHook *serviceptr;
790 /* specify default port name and trace file */
791 strcpy(tracefile, "");
793 /* initialize the master context */
794 InitializeMasterCC();
796 /* parse command-line arguments */
797 for (a=1; a<argc; ++a) {
799 /* -t specifies where to log trace messages to */
800 if (!strncmp(argv[a], "-t", 2)) {
801 strcpy(tracefile, argv[a]);
802 strcpy(tracefile, &tracefile[2]);
803 freopen(tracefile, "r", stdin);
804 freopen(tracefile, "w", stdout);
805 freopen(tracefile, "w", stderr);
808 /* run in the background if -d was specified */
809 else if (!strcmp(argv[a], "-d")) {
810 start_daemon( (strlen(tracefile) > 0) ? 0 : 1 ) ;
813 /* -x specifies the desired logging level */
814 else if (!strncmp(argv[a], "-x", 2)) {
815 verbosity = atoi(&argv[a][2]);
818 else if (!strncmp(argv[a], "-h", 2)) {
819 safestrncpy(bbs_home_directory, &argv[a][2],
820 sizeof bbs_home_directory);
824 else if (!strncmp(argv[a], "-f", 2)) {
828 /* -r tells the server not to drop root permissions. don't use
829 * this unless you know what you're doing. this should be
830 * removed in the next release if it proves unnecessary. */
831 else if (!strcmp(argv[a], "-r"))
834 /* any other parameter makes it crash and burn */
836 lprintf(1, "citserver: usage: "
837 "citserver [-tTraceFile] [-d] [-f]"
838 " [-xLogLevel] [-hHomeDir]\n");
844 /* Tell 'em who's in da house */
846 "\nMultithreaded message server for Citadel/UX\n"
847 "Copyright (C) 1987-1999 by the Citadel/UX development team.\n"
848 "Citadel/UX is free software, covered by the GNU General Public License, and\n"
849 "you are welcome to change it and/or distribute copies of it under certain\n"
850 "conditions. There is absolutely no warranty for this software. Please\n"
851 "read the 'COPYING.txt' file for details.\n\n");
855 openlog("citserver",LOG_PID,LOG_USER);
857 /* Load site-specific parameters */
858 lprintf(7, "Loading citadel.config\n");
862 * Do non system dependent startup functions.
867 * Bind the server to our favorite ports.
869 CtdlRegisterServiceHook(config.c_port_number, /* TCP */
870 citproto_begin_session,
872 CtdlRegisterServiceHook(0-config.c_port_number, /* Unix */
873 citproto_begin_session,
877 * Load any server-side modules (plugins) available here.
879 lprintf(7, "Initializing loadable modules\n");
880 if ((moddir = malloc(strlen(bbs_home_directory) + 9)) != NULL) {
881 sprintf(moddir, "%s/modules", bbs_home_directory);
882 DLoader_Init(moddir);
887 * The rescan pipe exists so that worker threads can be woken up and
888 * told to re-scan the context list for fd's to listen on. This is
889 * necessary, for example, when a context is about to go idle and needs
890 * to get back on that list.
893 lprintf(1, "Can't create rescan pipe!\n");
898 * Set up a fd_set containing all the master sockets to which we
899 * always listen. It's computationally less expensive to just copy
900 * this to a local fd_set when starting a new select() and then add
901 * the client sockets than it is to initialize a new one and then
902 * figure out what to put there.
906 FD_SET(rescan[0], &masterfds);
907 if (rescan[0] > masterhighest) masterhighest = rescan[0];
909 for (serviceptr = ServiceHookTable; serviceptr != NULL;
910 serviceptr = serviceptr->next ) {
911 FD_SET(serviceptr->msock, &masterfds);
912 if (serviceptr->msock > masterhighest) {
913 masterhighest = serviceptr->msock;
919 * Now that we've bound the sockets, change to the BBS user id and its
920 * corresponding group ids
922 if (drop_root_perms) {
923 if ((pw = getpwuid(BBSUID)) == NULL)
924 lprintf(1, "WARNING: getpwuid(%d): %s\n"
925 "Group IDs will be incorrect.\n", BBSUID,
928 initgroups(pw->pw_name, pw->pw_gid);
929 if (setgid(pw->pw_gid))
930 lprintf(3, "setgid(%d): %s\n", pw->pw_gid,
933 lprintf(7, "Changing uid to %d\n", BBSUID);
934 if (setuid(BBSUID) != 0) {
935 lprintf(3, "setuid() failed: %s\n", strerror(errno));
940 * Create the housekeeper thread
942 lprintf(7, "Starting housekeeper thread\n");
943 pthread_attr_init(&attr);
944 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
945 if (pthread_create(&HousekeepingThread, &attr,
946 (void* (*)(void*)) housekeeping_loop, NULL) != 0) {
947 lprintf(1, "Can't create housekeeping thead: %s\n",
953 * Now create a bunch of worker threads.
955 for (i=0; i<(config.c_min_workers-1); ++i) {
956 pthread_attr_init(&attr);
957 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
958 if (pthread_create(&HousekeepingThread, &attr,
959 (void* (*)(void*)) worker_thread, NULL) != 0) {
960 lprintf(1, "Can't create worker thead: %s\n",
965 /* Now this thread can become a worker as well. */
973 * Bind a thread to a context.
975 inline void become_session(struct CitContext *which_con) {
976 pthread_setspecific(MyConKey, (void *)which_con );
982 * This loop just keeps going and going and going...
984 void worker_thread(void) {
988 struct CitContext *ptr;
989 struct CitContext *bind_me = NULL;
992 struct CitContext *con= NULL; /* Temporary context pointer */
993 struct ServiceFunctionHook *serviceptr;
994 struct sockaddr_in fsin; /* Data for master socket */
995 int alen; /* Data for master socket */
996 int ssock; /* Descriptor for client socket */
1001 while (!time_to_die) {
1004 * A naive implementation would have all idle threads
1005 * calling select() and then they'd all wake up at once. We
1006 * solve this problem by putting the select() in a critical
1007 * section, so only one thread has the opportunity to wake
1008 * up. If we wake up on the master socket, create a new
1009 * session context; otherwise, just bind the thread to the
1010 * context we want and go on our merry way.
1013 begin_critical_section(S_I_WANNA_SELECT);
1014 SETUP_FD: memcpy(&readfds, &masterfds, sizeof(fd_set) );
1015 highest = masterhighest;
1016 begin_critical_section(S_SESSION_TABLE);
1017 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1018 if (ptr->state == CON_IDLE) {
1019 FD_SET(ptr->client_socket, &readfds);
1020 if (ptr->client_socket > highest)
1021 highest = ptr->client_socket;
1024 end_critical_section(S_SESSION_TABLE);
1026 tv.tv_sec = 60; /* wake up every minute if no input */
1028 retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1030 /* Now figure out who made this select() unblock.
1031 * First, check for an error or exit condition.
1034 end_critical_section(S_I_WANNA_SELECT);
1035 lprintf(9, "Exiting (%s)\n", strerror(errno));
1039 /* Next, check to see if it's a new client connecting
1040 * on the master socket.
1042 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1043 serviceptr = serviceptr->next ) {
1045 if (FD_ISSET(serviceptr->msock, &readfds)) {
1047 ssock = accept(serviceptr->msock,
1048 (struct sockaddr *)&fsin, &alen);
1050 lprintf(2, "citserver: accept(): %s\n",
1054 lprintf(7, "citserver: "
1055 "New client socket %d\n",
1058 /* New context will be created already
1059 * set up in the CON_EXECUTING state.
1061 con = CreateNewContext();
1063 /* Assign new socket number to it. */
1064 con->client_socket = ssock;
1065 con->h_command_function =
1066 serviceptr->h_command_function;
1068 /* Set the SO_REUSEADDR socket option */
1070 setsockopt(ssock, SOL_SOCKET,
1074 become_session(con);
1076 serviceptr->h_greeting_function();
1077 become_session(NULL);
1078 con->state = CON_IDLE;
1084 /* If the rescan pipe went active, someone is telling this
1085 * thread that the &readfds needs to be refreshed with more
1088 if (!time_to_die) if (FD_ISSET(rescan[0], &readfds)) {
1089 read(rescan[0], &junk, 1);
1093 /* It must be a client socket. Find a context that has data
1094 * waiting on its socket *and* is in the CON_IDLE state.
1098 begin_critical_section(S_SESSION_TABLE);
1099 for (ptr = ContextList;
1100 ( (ptr != NULL) && (bind_me == NULL) );
1102 if ( (FD_ISSET(ptr->client_socket, &readfds))
1103 && (ptr->state == CON_IDLE) ) {
1107 if (bind_me != NULL) {
1108 /* Found one. Stake a claim to it before
1109 * letting anyone else touch the context list.
1111 bind_me->state = CON_EXECUTING;
1114 end_critical_section(S_SESSION_TABLE);
1115 end_critical_section(S_I_WANNA_SELECT);
1117 /* We're bound to a session, now do *one* command */
1118 if (bind_me != NULL) {
1119 become_session(bind_me);
1120 CC->h_command_function();
1121 become_session(NULL);
1122 bind_me->state = CON_IDLE;
1123 if (bind_me->kill_me == 1) {
1124 RemoveContext(bind_me);
1126 write(rescan[1], &junk, 1);
1130 dead_session_purge();
1131 if ((time(NULL) - last_timer) > 60L) {
1132 last_timer = time(NULL);
1133 PerformSessionHooks(EVT_TIMER);
1137 /* If control reaches this point, the server is shutting down */