5 * \defgroup Webserver This contains a simple multithreaded TCP server manager. It sits around
6 * waiting on the specified port for incoming HTTP connections. When a
7 * connection is established, it calls context_loop() from context_loop.c.
8 * \ingroup WebcitHttpServer
13 #include "webserver.h"
20 int vsnprintf(char *buf, size_t max, const char *fmt, va_list argp);
23 int verbosity = 9; /**< Logging level */
24 int msock; /**< master listening socket */
25 int is_https = 0; /**< Nonzero if I am an HTTPS service */
26 int follow_xff = 0; /**< Follow X-Forwarded-For: header */
27 int home_specified = 0; /**< did the user specify a homedir? */
28 int time_to_die = 0; /**< Nonzero if server is shutting down */
29 extern void *context_loop(int);
30 extern void *housekeeping_loop(void);
31 extern pthread_mutex_t SessionListMutex;
32 extern pthread_key_t MyConKey;
35 char ctdl_key_dir[PATH_MAX]=SSL_DIR;
36 char file_crpt_file_key[PATH_MAX]="";
37 char file_crpt_file_csr[PATH_MAX]="";
38 char file_crpt_file_cer[PATH_MAX]="";
40 char socket_dir[PATH_MAX]; /**< where to talk to our citadel server */
41 static const char editor_absolut_dir[PATH_MAX]=EDITORDIR; /**< nailed to what configure gives us. */
42 static char static_dir[PATH_MAX]; /**< calculated on startup */
43 static char static_local_dir[PATH_MAX]; /**< calculated on startup */
44 char *static_dirs[]={ /**< needs same sort order as the web mapping */
45 (char*)static_dir, /** our templates on disk */
46 (char*)static_local_dir, /** user provided templates disk */
47 (char*)editor_absolut_dir /** the editor on disk */
51 * Subdirectories from which the client may request static content
53 * (If you add more, remember to increment 'ndirs' below)
55 char *static_content_dirs[] = {
56 "static", /** static templates */
57 "static.local", /** site local static templates */
58 "tiny_mce" /** rich text editor */
64 char *server_cookie = NULL; /**< our Cookie connection to the client */
65 int http_port = PORT_NUM; /**< Port to listen on */
66 char *ctdlhost = DEFAULT_HOST; /**< our name */
67 char *ctdlport = DEFAULT_PORT; /**< our Port */
68 int setup_wizard = 0; /**< should we run the setup wizard? \todo */
69 char wizard_filename[PATH_MAX]; /**< where's the setup wizard? */
70 int running_as_daemon = 0; /**< should we deamonize on startup? */
74 * \brief This is a generic function to set up a master socket for listening on
75 * a TCP port. The server shuts down if the bind fails.
76 * \param ip_addr ip to bind to
77 * \param port_number the port to bind to
78 * \param queue_len Number of incoming connections to allow in the queue
80 int ig_tcp_server(char *ip_addr, int port_number, int queue_len)
82 struct sockaddr_in sin;
85 memset(&sin, 0, sizeof(sin));
86 sin.sin_family = AF_INET;
87 if (ip_addr == NULL) {
88 sin.sin_addr.s_addr = INADDR_ANY;
90 sin.sin_addr.s_addr = inet_addr(ip_addr);
93 if (sin.sin_addr.s_addr == INADDR_NONE) {
94 sin.sin_addr.s_addr = INADDR_ANY;
97 if (port_number == 0) {
98 lprintf(1, "Cannot start: no port number specified.\n");
101 sin.sin_port = htons((u_short) port_number);
103 s = socket(PF_INET, SOCK_STREAM, (getprotobyname("tcp")->p_proto));
105 lprintf(1, "Can't create a socket: %s\n", strerror(errno));
108 /** Set some socket options that make sense. */
110 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
112 fcntl(s, F_SETFL, O_NONBLOCK);/// TODO
114 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
115 lprintf(1, "Can't bind: %s\n", strerror(errno));
118 if (listen(s, queue_len) < 0) {
119 lprintf(1, "Can't listen: %s\n", strerror(errno));
128 * \brief Create a Unix domain socket and listen on it
129 * \param sockpath file name of the unix domain socket
130 * \param queue_len Number of incoming connections to allow in the queue
132 int ig_uds_server(char *sockpath, int queue_len)
134 struct sockaddr_un addr;
137 int actual_queue_len;
139 actual_queue_len = queue_len;
140 if (actual_queue_len < 5) actual_queue_len = 5;
142 i = unlink(sockpath);
143 if (i != 0) if (errno != ENOENT) {
144 lprintf(1, "citserver: can't unlink %s: %s\n",
145 sockpath, strerror(errno));
149 memset(&addr, 0, sizeof(addr));
150 addr.sun_family = AF_UNIX;
151 safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
153 s = socket(AF_UNIX, SOCK_STREAM, 0);
155 lprintf(1, "citserver: Can't create a socket: %s\n",
160 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
161 lprintf(1, "citserver: Can't bind: %s\n",
166 if (listen(s, actual_queue_len) < 0) {
167 lprintf(1, "citserver: Can't listen: %s\n",
172 chmod(sockpath, 0777);
180 * \brief Read data from the client socket.
181 * \param sock socket fd to read from
182 * \param buf buffer to read into
183 * \param bytes number of bytes to read
184 * \param timeout Number of seconds to wait before timing out
185 * \return values are\
186 * 1 Requested number of bytes has been read.\
187 * 0 Request timed out.\
188 * -1 Connection is broken, or other error.
190 int client_read_to(int sock, char *buf, int bytes, int timeout)
200 return (client_read_ssl(buf, bytes, timeout));
205 while (len < bytes) {
211 retval = select((sock) + 1, &rfds, NULL, NULL, &tv);
212 if (FD_ISSET(sock, &rfds) == 0) {
216 rlen = read(sock, &buf[len], bytes - len);
219 lprintf(2, "client_read() failed: %s\n",
227 write(2, "\033[32m", 5);
228 write(2, buf, bytes);
229 write(2, "\033[30m", 5);
235 * \brief write data to the client
236 * \param buf data to write to the client
237 * \param count size of buffer
239 ssize_t client_write(const void *buf, size_t count)
244 if (WC->burst != NULL) {
245 if ((WC->burst_len + count) >= WC->burst_alloc) {
246 newalloc = (WC->burst_alloc * 2);
247 if ((WC->burst_len + count) >= newalloc) {
250 newptr = realloc(WC->burst, newalloc);
251 if (newptr != NULL) {
253 WC->burst_alloc = newalloc;
256 if ((WC->burst_len + count) < WC->burst_alloc) {
257 memcpy(&WC->burst[WC->burst_len], buf, count);
258 WC->burst_len += count;
267 client_write_ssl((char *) buf, count);
272 write(2, "\033[34m", 5);
273 write(2, buf, count);
274 write(2, "\033[30m", 5);
276 return (write(WC->http_sock, buf, count));
280 * \brief Begin buffering HTTP output so we can transmit it all in one write operation later.
282 void begin_burst(void)
284 if (WC->burst != NULL) {
289 WC->burst_alloc = 32768;
290 WC->burst = malloc(WC->burst_alloc);
295 * \brief uses the same calling syntax as compress2(), but it
296 * creates a stream compatible with HTTP "Content-encoding: gzip"
299 #define DEF_MEM_LEVEL 8 /**< memlevel??? */
300 #define OS_CODE 0x03 /**< unix */
301 int ZEXPORT compress_gzip(Bytef * dest, /**< compressed buffer*/
302 size_t * destLen, /**< length of the compresed data */
303 const Bytef * source, /**< source to encode */
304 uLong sourceLen, /**< length of source to encode */
305 int level) /**< compression level */
307 const int gz_magic[2] = { 0x1f, 0x8b }; /** gzip magic header */
309 /** write gzip header */
310 snprintf((char *) dest, *destLen,
311 "%c%c%c%c%c%c%c%c%c%c",
312 gz_magic[0], gz_magic[1], Z_DEFLATED,
313 0 /*flags */ , 0, 0, 0, 0 /*time */ , 0 /** xflags */ ,
319 stream.next_in = (Bytef *) source;
320 stream.avail_in = (uInt) sourceLen;
321 stream.next_out = dest + 10L; // after header
322 stream.avail_out = (uInt) * destLen;
323 if ((uLong) stream.avail_out != *destLen)
326 stream.zalloc = (alloc_func) 0;
327 stream.zfree = (free_func) 0;
328 stream.opaque = (voidpf) 0;
330 err = deflateInit2(&stream, level, Z_DEFLATED, -MAX_WBITS,
331 DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
335 err = deflate(&stream, Z_FINISH);
336 if (err != Z_STREAM_END) {
338 return err == Z_OK ? Z_BUF_ERROR : err;
340 *destLen = stream.total_out + 10L;
342 /* write CRC and Length */
343 uLong crc = crc32(0L, source, sourceLen);
345 for (n = 0; n < 4; ++n, ++*destLen) {
346 dest[*destLen] = (int) (crc & 0xff);
349 uLong len = stream.total_in;
350 for (n = 0; n < 4; ++n, ++*destLen) {
351 dest[*destLen] = (int) (len & 0xff);
354 err = deflateEnd(&stream);
360 * \brief Finish buffering HTTP output. [Compress using zlib and] output with a Content-Length: header.
367 if (WC->burst == NULL)
370 the_len = WC->burst_len;
371 the_data = WC->burst;
378 /* Perform gzip compression, if enabled and supported by client */
380 char *compressed_data = NULL;
381 size_t compressed_len;
383 compressed_len = ((the_len * 101) / 100) + 100;
384 compressed_data = malloc(compressed_len);
386 if (compress_gzip((Bytef *) compressed_data,
389 (uLongf) the_len, Z_BEST_SPEED) == Z_OK) {
390 wprintf("Content-encoding: gzip\r\n");
392 the_data = compressed_data;
393 the_len = compressed_len;
395 free(compressed_data);
398 #endif /* HAVE_ZLIB */
400 wprintf("Content-length: %d\r\n\r\n", the_len);
401 client_write(the_data, the_len);
409 * \brief Read data from the client socket with default timeout.
410 * (This is implemented in terms of client_read_to() and could be
411 * justifiably moved out of sysdep.c)
412 * \param sock the socket fd to read from
413 * \param buf the buffer to write to
414 * \param bytes Number of bytes to read
416 int client_read(int sock, char *buf, int bytes)
418 return (client_read_to(sock, buf, bytes, SLEEPING));
423 * \brief Get a LF-terminated line of text from the client.
424 * (This is implemented in terms of client_read() and could be
425 * justifiably moved out of sysdep.c)
426 * \param sock socket fd to get client line from
427 * \param buf buffer to write read data to
428 * \param bufsiz how many bytes to read
429 * \return number of bytes read???
431 int client_getln(int sock, char *buf, int bufsiz)
435 /** Read one character at a time.*/
437 retval = client_read(sock, &buf[i], 1);
438 if (retval != 1 || buf[i] == '\n' || i == (bufsiz-1))
440 if ( (!isspace(buf[i])) && (!isprint(buf[i])) ) {
441 /** Non printable character recieved from client */
446 /** If we got a long line, discard characters until the newline. */
448 while (buf[i] != '\n' && retval == 1)
449 retval = client_read(sock, &buf[i], 1);
452 * Strip any trailing non-printable characters.
455 while ((i > 0) && (!isprint(buf[i - 1]))) {
462 * \brief shut us down the regular way.
463 * param signum the signal we want to forward
466 void graceful_shutdown_watcher(int signum) {
467 lprintf (1, "bye; shutting down watcher.");
468 kill(current_child, signum);
473 * \brief shut us down the regular way.
474 * param signum the signal we want to forward
477 void graceful_shutdown(int signum) {
478 // kill(current_child, signum);
483 lprintf (1, "bye going down gracefull.[%d][%s]\n", signum, wd);
495 * \brief Start running as a daemon.
497 * param do_close_stdio Only close stdio if set.
501 * Start running as a daemon.
503 void start_daemon(char *pid_file)
512 /* Close stdin/stdout/stderr and replace them with /dev/null.
513 * We don't just call close() because we don't want these fd's
514 * to be reused for other files.
518 signal(SIGHUP, SIG_IGN);
519 signal(SIGINT, SIG_IGN);
520 signal(SIGQUIT, SIG_IGN);
529 freopen("/dev/null", "r", stdin);
530 freopen("/dev/null", "w", stdout);
531 freopen("/dev/null", "w", stderr);
532 /// signal(SIGTERM, graceful_shutdown_watcher);
533 signal(SIGHUP, graceful_shutdown_watcher);
536 current_child = fork();
539 if (current_child < 0) {
544 else if (current_child == 0) {
545 //// signal(SIGTERM, graceful_shutdown);
546 signal(SIGHUP, graceful_shutdown);
548 return; /* continue starting webcit. */
552 //// signal(SIGTERM, SIG_IGN);
553 signal(SIGHUP, SIG_IGN);
555 fp = fopen(pid_file, "w");
557 fprintf(fp, "%d\n", current_child);
561 waitpid(current_child, &status, 0);
566 /* Did the main process exit with an actual exit code? */
567 if (WIFEXITED(status)) {
569 /* Exit code 0 means the watcher should exit */
570 if (WEXITSTATUS(status) == 0) {
574 /* Exit code 101-109 means the watcher should exit */
575 else if ( (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109) ) {
579 /* Any other exit code means we should restart. */
585 /* Any other type of termination (signals, etc.) should also restart. */
590 } while (do_restart);
595 exit(WEXITSTATUS(status));
599 * \brief Spawn an additional worker thread into the pool.
601 void spawn_another_worker_thread()
603 pthread_t SessThread; /**< Thread descriptor */
604 pthread_attr_t attr; /**< Thread attributes */
607 lprintf(3, "Creating a new thread\n");
609 /** set attributes for the new thread */
610 pthread_attr_init(&attr);
611 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
614 * Our per-thread stacks need to be bigger than the default size, otherwise
615 * the MIME parser crashes on FreeBSD, and the IMAP service crashes on
618 if ((ret = pthread_attr_setstacksize(&attr, 1024 * 1024))) {
619 lprintf(1, "pthread_attr_setstacksize: %s\n",
621 pthread_attr_destroy(&attr);
624 /** now create the thread */
625 if (pthread_create(&SessThread, &attr,
626 (void *(*)(void *)) worker_entry, NULL)
628 lprintf(1, "Can't create thread: %s\n", strerror(errno));
631 /** free up the attributes */
632 pthread_attr_destroy(&attr);
636 * \brief Here's where it all begins.
637 * \param argc number of commandline args
638 * \param argv the commandline arguments
640 int main(int argc, char **argv)
642 pthread_t SessThread; /**< Thread descriptor */
643 pthread_attr_t attr; /**< Thread attributes */
644 int a, i; /**< General-purpose variables */
645 char tracefile[PATH_MAX];
646 char ip_addr[256]="0.0.0.0";
647 char dirbuffer[PATH_MAX]="";
650 int home_specified=0;
651 char relhome[PATH_MAX]="";
652 char webcitdir[PATH_MAX] = DATADIR;
653 char *pidfile = NULL;
659 #endif /* ENABLE_NLS */
660 char uds_listen_path[PATH_MAX]; /**< listen on a unix domain socket? */
662 strcpy(uds_listen_path, "");
664 /** Parse command line */
666 while ((a = getopt(argc, argv, "h:i:p:t:x:dD:cfs")) != EOF)
668 while ((a = getopt(argc, argv, "h:i:p:t:x:dD:cf")) != EOF)
672 hdir = strdup(optarg);
674 if (!relh) safestrncpy(webcitdir, hdir,
677 safestrncpy(relhome, relhome,
679 /* free(hdir); TODO: SHOULD WE DO THIS? */
684 running_as_daemon = 1;
687 pidfile = strdup(optarg);
688 running_as_daemon = 1;
691 safestrncpy(ip_addr, optarg, sizeof ip_addr);
694 http_port = atoi(optarg);
695 if (http_port == 0) {
696 safestrncpy(uds_listen_path, optarg, sizeof uds_listen_path);
700 safestrncpy(tracefile, optarg, sizeof tracefile);
701 freopen(tracefile, "w", stdout);
702 freopen(tracefile, "w", stderr);
703 freopen(tracefile, "r", stdin);
706 verbosity = atoi(optarg);
712 server_cookie = malloc(256);
713 if (server_cookie != NULL) {
714 safestrncpy(server_cookie,
715 "Set-cookie: wcserver=",
718 (&server_cookie[strlen(server_cookie)],
720 lprintf(2, "gethostname: %s\n",
730 fprintf(stderr, "usage: webserver "
731 "[-i ip_addr] [-p http_port] "
732 "[-t tracefile] [-c] [-f] "
737 "[remotehost [remoteport]]\n");
742 ctdlhost = argv[optind];
744 ctdlport = argv[optind];
747 /* daemonize, if we were asked to */
748 if (running_as_daemon) {
749 start_daemon(pidfile);
752 /// signal(SIGTERM, graceful_shutdown);
753 signal(SIGHUP, graceful_shutdown);
756 /** Tell 'em who's in da house */
757 lprintf(1, PACKAGE_STRING "\n");
758 lprintf(1, "Copyright (C) 1996-2008 by the Citadel development team.\n"
759 "This software is distributed under the terms of the "
760 "GNU General Public License.\n\n"
764 /** initialize the International Bright Young Thing */
766 initialize_locales();
767 locale = setlocale(LC_ALL, "");
768 mo = malloc(strlen(webcitdir) + 20);
769 lprintf(9, "Message catalog directory: %s\n", bindtextdomain("webcit", LOCALEDIR"/locale"));
771 lprintf(9, "Text domain: %s\n", textdomain("webcit"));
772 lprintf(9, "Text domain Charset: %s\n", bind_textdomain_codeset("webcit","UTF8"));
776 /* calculate all our path on a central place */
777 /* where to keep our config */
779 #define COMPUTE_DIRECTORY(SUBDIR) memcpy(dirbuffer,SUBDIR, sizeof dirbuffer);\
780 snprintf(SUBDIR,sizeof SUBDIR, "%s%s%s%s%s%s%s", \
781 (home&!relh)?webcitdir:basedir, \
782 ((basedir!=webcitdir)&(home&!relh))?basedir:"/", \
783 ((basedir!=webcitdir)&(home&!relh))?"/":"", \
785 (relhome[0]!='\0')?"/":"",\
787 (dirbuffer[0]!='\0')?"/":"");
789 COMPUTE_DIRECTORY(socket_dir);
790 basedir=WWWDIR "/static";
791 COMPUTE_DIRECTORY(static_dir);
792 basedir=WWWDIR "/static.local";
793 COMPUTE_DIRECTORY(static_local_dir);
795 snprintf(file_crpt_file_key,
796 sizeof file_crpt_file_key,
799 snprintf(file_crpt_file_csr,
800 sizeof file_crpt_file_csr,
803 snprintf(file_crpt_file_cer,
804 sizeof file_crpt_file_cer,
808 /** we should go somewhere we can leave our coredump, if enabled... */
809 lprintf(9, "Changing directory to %s\n", socket_dir);
810 if (chdir(webcitdir) != 0) {
813 initialize_viewdefs();
817 * Set up a place to put thread-specific data.
818 * We only need a single pointer per thread - it points to the
819 * wcsession struct to which the thread is currently bound.
821 if (pthread_key_create(&MyConKey, NULL) != 0) {
822 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
824 InitialiseSemaphores ();
827 * Set up a place to put thread-specific SSL data.
828 * We don't stick this in the wcsession struct because SSL starts
829 * up before the session is bound, and it gets torn down between
833 if (pthread_key_create(&ThreadSSL, NULL) != 0) {
834 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
839 * Bind the server to our favorite port.
840 * There is no need to check for errors, because ig_tcp_server()
841 * exits if it doesn't succeed.
844 if (!IsEmptyStr(uds_listen_path)) {
845 lprintf(2, "Attempting to create listener socket at %s...\n", uds_listen_path);
846 msock = ig_uds_server(uds_listen_path, LISTEN_QUEUE_LENGTH);
849 lprintf(2, "Attempting to bind to port %d...\n", http_port);
850 msock = ig_tcp_server(ip_addr, http_port, LISTEN_QUEUE_LENGTH);
853 lprintf(2, "Listening on socket %d\n", msock);
854 signal(SIGPIPE, SIG_IGN);
856 pthread_mutex_init(&SessionListMutex, NULL);
859 * Start up the housekeeping thread
861 pthread_attr_init(&attr);
862 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
863 pthread_create(&SessThread, &attr,
864 (void *(*)(void *)) housekeeping_loop, NULL);
868 * If this is an HTTPS server, fire up SSL
876 /** Start a few initial worker threads */
877 for (i = 0; i < (MIN_WORKER_THREADS); ++i) {
878 spawn_another_worker_thread();
881 /* now the original thread becomes another worker */
888 * Entry point for worker threads
890 void worker_entry(void)
894 int fail_this_transaction = 0;
897 fd_set readset, tempset;
902 FD_SET(msock, &readset);
905 /** Only one thread can accept at a time */
906 fail_this_transaction = 0;
910 ret = -1; /* just one at once should select... */
911 begin_critical_section(S_SELECT);
914 if (msock > 0) FD_SET(msock, &tempset);
917 if (msock > 0) ret = select(msock+1, &tempset, NULL, NULL, &tv);
918 end_critical_section(S_SELECT);
919 if ((ret < 0) && (errno != EINTR) && (errno != EAGAIN))
920 {// EINTR and EAGAIN are thrown but not of interest.
921 lprintf(2, "accept() failed:%d %s\n",
922 errno, strerror(errno));
924 else if ((ret > 0) && (msock > 0) && FD_ISSET(msock, &tempset))
925 {// Successfully selected, and still not shutting down? Accept!
926 ssock = accept(msock, NULL, 0);
929 } while ((msock > 0) && (ssock < 0) && (time_to_die == 0));
931 if ((msock == -1)||(time_to_die))
932 {// ok, we're going down.
935 /* the first to come here will have to do the cleanup.
936 * make shure its realy just one.
938 begin_critical_section(S_SHUTDOWN);
944 end_critical_section(S_SHUTDOWN);
946 {// we're the one to cleanup the mess.
947 lprintf(2, "I'm master shutdown: tagging sessions to be killed.\n");
949 lprintf(2, "master shutdown: waiting for others\n");
950 sleeeeeeeeeep(1); // wait so some others might finish...
951 lprintf(2, "master shutdown: cleaning up sessions\n");
953 #ifdef WEBCIT_WITH_CALENDAR_SERVICE
954 lprintf(2, "master shutdown: cleaning up libical\n");
955 free_zone_directory ();
956 icaltimezone_release_zone_tab ();
957 icalmemory_free_ring ();
959 lprintf(2, "master shutdown exiting!.\n");
964 if (ssock < 0 ) continue;
967 if (ssock > 0) close (ssock);
968 lprintf(2, "inbetween.");
970 } else { // Got it? do some real work!
971 /** Set the SO_REUSEADDR socket option */
973 setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR,
976 /** If we are an HTTPS server, go crypto now. */
979 if (starttls(ssock) != 0) {
980 fail_this_transaction = 1;
986 if (fail_this_transaction == 0) {
988 /** Perform an HTTP transaction... */
991 /** Shut down SSL/TLS if required... */
998 /** ...and close the socket. */
999 lingering_close(ssock);
1004 } while (!time_to_die);
1006 lprintf (1, "bye\n");
1011 * \brief logprintf. log messages
1012 * logs to stderr if loglevel is lower than the verbosity set at startup
1013 * \param loglevel level of the message
1014 * \param format the printf like format string
1015 * \param ... the strings to put into format
1017 int lprintf(int loglevel, const char *format, ...)
1021 if (loglevel <= verbosity) {
1022 va_start(ap, format);
1023 vfprintf(stderr, format, ap);
1032 * \brief print the actual stack frame.
1034 void wc_backtrace(void)
1036 #ifdef HAVE_BACKTRACE
1037 void *stack_frames[50];
1042 size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
1043 strings = backtrace_symbols(stack_frames, size);
1044 for (i = 0; i < size; i++) {
1045 if (strings != NULL)
1046 lprintf(1, "%s\n", strings[i]);
1048 lprintf(1, "%p\n", stack_frames[i]);