2 * Copyright (c) 1995, the EUROPAGATE consortium (see below).
4 * The EUROPAGATE consortium members are:
6 * University College Dublin
7 * Danmarks Teknologiske Videnscenter
8 * An Chomhairle Leabharlanna
9 * Consejo Superior de Investigaciones Cientificas
11 * Permission to use, copy, modify, distribute, and sell this software and
12 * its documentation, in whole or in part, for any purpose, is hereby granted,
15 * 1. This copyright and permission notice appear in all copies of the
16 * software and its documentation. Notices of copyright or attribution
17 * which appear at the beginning of any file must remain unchanged.
19 * 2. The names of EUROPAGATE or the project partners may not be used to
20 * endorse or promote products derived from this software without specific
21 * prior written permission.
23 * 3. Users of this software (implementors and gateway operators) agree to
24 * inform the EUROPAGATE consortium of their use of the software. This
25 * information will be used to evaluate the EUROPAGATE project and the
26 * software, and to plan further developments. The consortium may use
27 * the information in later publications.
29 * 4. Users of this software agree to make their best efforts, when
30 * documenting their use of the software, to acknowledge the EUROPAGATE
31 * consortium, and the role played by the software in their work.
33 * THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND,
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36 * IN NO EVENT SHALL THE EUROPAGATE CONSORTIUM OR ITS MEMBERS BE LIABLE
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39 * OR PROFITS, WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND
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41 * USE OR PERFORMANCE OF THIS SOFTWARE.
44 /* Gateway Resource Monitor
48 * Revision 1.10 1995/05/18 12:03:09 adam
49 * Bug fixes and minor improvements.
51 * Revision 1.9 1995/05/17 10:51:32 adam
52 * Added a few more error checks to the show command.
54 * Revision 1.8 1995/05/16 09:40:42 adam
55 * LICENSE. Setting of CCL token names (and/or/not/set) in read_kernel_res.
57 * Revision 1.7 1995/05/03 12:18:46 adam
58 * This code ran on dtbsun. Minor changes.
60 * Revision 1.6 1995/05/03 09:16:17 adam
63 * Revision 1.5 1995/05/03 07:37:42 adam
64 * CCL commands stop/continue implemented. New functions gw_res_{int,bool}
65 * are used when possible.
67 * Revision 1.4 1995/05/02 15:26:00 adam
68 * Monitor observes death of child (email kernel). The number
69 * of simultanous processes is controlled now. Email requests are
70 * queued if necessary. This scheme should only be forced if no kernels
73 * Revision 1.3 1995/05/02 07:20:10 adam
74 * Use pid of exited child to close fifos.
76 * Revision 1.2 1995/05/01 16:26:57 adam
77 * More work on resource monitor.
79 * Revision 1.1 1995/05/01 12:43:36 adam
80 * First work on resource monitor program.
97 #include <sys/types.h>
104 #include <strqueue.h>
107 #define LINE_MAX 1024
109 #define MONITOR_FIFO_S "fifo.s.m"
110 #define MONITOR_FIFO_C "fifo.c.m"
112 static char *module = "monitor";
113 static jmp_buf retry_jmp;
115 static GwRes monitor_res = NULL;
116 static int no_process = 0;
117 static int max_process = 1;
118 static int got_sighup = 0;
119 static int got_term = 0;
120 static int got_int = 0;
121 const char *default_res = "default.res";
124 * reread_resources: reread monitor resources. The static variable,
125 * max_process, is updated.
127 static void reread_resources (void)
130 gw_res_close (monitor_res);
131 monitor_res = gw_res_init ();
132 if (gw_res_merge (monitor_res, default_res))
134 gw_log (GW_LOG_WARN, module, "Couldn't read resource file %s",
138 max_process = gw_res_int (monitor_res, "gw.max.process", 10);
142 int id; /* email user-id */
143 pid_t pid; /* pid of email kernel child */
144 GIP gip; /* fifo information */
145 struct str_queue *queue; /* message queue */
146 struct ke_info *next; /* link to next */
149 /* list of email kernel infos */
150 static struct ke_info *ke_info_list = NULL;
153 * ke_info_add: add/lookup of email kernel info.
154 * id: email user-id to search for.
155 * return: pointer to info structure.
157 struct ke_info *ke_info_add (int id)
159 struct ke_info **kip;
161 for (kip = &ke_info_list; *kip; kip= &(*kip)->next)
162 if ((*kip)->id == id)
164 *kip = malloc (sizeof(**kip));
169 (*kip)->queue = NULL;
173 static void ke_info_del (void)
177 assert (ke_info_list);
179 str_queue_rm (&ki->queue);
180 ke_info_list = ki->next;
185 * catch_child: catch SIGCHLD. Set email kernel pid to -1
186 * to indicate that child has exited
188 static void catch_child (int num)
193 while ((pid=waitpid (-1, 0, WNOHANG)) > 0)
195 for (ki = ke_info_list; ki; ki = ki->next)
200 signal (SIGCHLD, catch_child);
204 * catch_int: catch SIGHUP.
206 static void catch_hup (int num)
209 signal (SIGHUP, catch_hup);
213 * catch_int: catch SIGTERM.
215 static void catch_term (int num)
218 signal (SIGTERM, catch_term);
222 * catch_int: catch SIGINT.
224 static void catch_int (int num)
227 signal (SIGINT, catch_int);
231 * pipe_handle: handle SIGPIPE when transferring message to kernel
233 static void pipe_handle (int dummy)
235 longjmp (retry_jmp, 1);
239 * start_kernel: start email kernel.
240 * argc: argc of email kernel
241 * argv: argv of email kernel
243 * return: pid of email kernel child
245 static pid_t start_kernel (int argc, char **argv, int id)
250 char userid_option[20];
252 argv_p = malloc (sizeof(*argv_p)*(argc+2));
255 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "malloc fail");
258 argv_p[0] = "kernel";
259 for (i = 1; i<argc; i++)
261 sprintf (userid_option, "-i%d", id);
262 argv_p[i++] = userid_option;
265 gw_log (GW_LOG_DEBUG, module, "Starting kernel");
269 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "fork");
274 execv ("kernel", argv_p);
275 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "execvp");
282 * deliver: deliver message to child (email kernel).
283 * argc: exec argc to child (if it need to be started)
284 * argv: exec argv to child (if it need to be started)
286 * queue: message queue to be transferred
287 * gip: pointer to FIFO info. if *gip is NULL prior invocation
288 * it will be created (initialized) and the pointer will be
290 * pidp: pointer to pid. Will hold process-id of child (if it need to
292 * dont_exec: if non-zero a child will never be started; otherwise child
293 * will be started if not already running.
294 * return: 0 if message couldn't be transferred, i.e. dont_exec is non-zero
295 * and the child is not already running.
296 * 1 if message was transferred and the child was already running.
297 * 2 if message was transferred and the child was started and
298 * dont_exec was zero.
299 * 3 serious error. Permissions denied or kernel couldn't be
302 static int deliver (int argc, char **argv, int id, struct str_queue *queue,
303 GIP *gip, pid_t *pidp, int dont_exec)
308 char fifo_server_name[128];
309 char fifo_client_name[128];
313 sprintf (fifo_server_name, "fifo.s.%d", id);
314 sprintf (fifo_client_name, "fifo.c.%d", id);
318 *gip = gipc_initialize (fifo_client_name);
320 oldsig = signal (SIGPIPE, pipe_handle);
324 { /* assume child is running */
325 gipc_close (*gip); /* shut down existing FIFOs */
326 r = gipc_open (*gip, fifo_server_name, 0); /* try re-open ... */
329 { /* assume child is NOT running */
333 { /* we aren't allowed to start */
334 signal (SIGPIPE, oldsig);
337 mknod (fifo_server_name, S_IFIFO|0666, 0);
338 pid = start_kernel (argc, argv, id);
339 if (pidp) /* set pid of child */
341 r = gipc_open (*gip, fifo_server_name, 1);
344 { /* message couldn't be transferred */
345 signal (SIGPIPE, oldsig);
346 gw_log (GW_LOG_WARN, module, "Cannot start kernel");
349 if (r < 0) /* gipc_open fail? */
352 gw_log (GW_LOG_DEBUG|GW_LOG_ERRNO, module, "r==-2");
354 gw_log (GW_LOG_DEBUG|GW_LOG_ERRNO, module, "r==-1");
356 gw_log (GW_LOG_WARN|GW_LOG_ERRNO, module, "gipc_open");
357 longjmp (retry_jmp, 1); /* yet another pass */
359 index = 0; /* transfer. may be interrupted */
360 while ((msg = str_queue_get (queue, index++)))
361 gip_wline (*gip, msg);
362 signal (SIGPIPE, oldsig);
363 return pass; /* successful transfer */
367 * monitor_events: Event loop of monitor
368 * argc: argc of monitor (used in exec of Email kernel children)
369 * argv: argv of monitor (used in exec of Email kernel children)
371 static void monitor_events (int argc, char **argv)
374 int r, gip_m_fd, too_many;
377 char command[128], *cp;
379 gip_m = gips_initialize (MONITOR_FIFO_S);
380 r = gips_open (gip_m, MONITOR_FIFO_C);
381 gip_m_fd = gip_infileno (gip_m);
382 open (MONITOR_FIFO_S, O_WRONLY);
393 gw_log (GW_LOG_STAT, module, "Got SIGHUP. Reading resources");
399 gw_log (GW_LOG_STAT, module, "Got SIGTERM. Exiting...");
400 unlink (MONITOR_FIFO_S);
401 unlink (MONITOR_FIFO_C);
406 gw_log (GW_LOG_STAT, module, "Got SIGINT. Exiting...");
407 unlink (MONITOR_FIFO_S);
408 unlink (MONITOR_FIFO_C);
411 /* deliver any unsent messages to Email kernels */
413 for (ki = ke_info_list; ki; ki = ki->next)
417 gw_log (GW_LOG_DEBUG, module, "Transfer mail to %d", ki->id);
418 r = deliver (argc, argv, ki->id, ki->queue, &ki->gip, &ki->pid,
419 no_process >= max_process);
420 if (r == 2) /* new child was spawned? */
423 gw_log (GW_LOG_DEBUG, module, "Start of %d", ki->id);
425 if (r == 1 || r == 2) /* transfer at all? */
426 str_queue_rm (&ki->queue);
427 if (r == 0) /* too many pending? */
433 gw_log (GW_LOG_DEBUG, module, "%d too many pending",
435 for (ki = ke_info_list; ki; ki = ki->next)
437 if (!ki->queue && ki->pid != -1)
439 if (!(ki->queue = str_queue_mk ()))
441 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module,
445 str_queue_enq (ki->queue, "stop\n");
446 str_queue_enq (ki->queue, "\001");
447 gw_log (GW_LOG_DEBUG, module, "Stopping %d", ki->id);
448 deliver (argc, argv, ki->id, ki->queue, &ki->gip,
450 str_queue_rm (&ki->queue);
457 FD_SET (gip_m_fd, &set_r);
458 gw_log (GW_LOG_DEBUG, module, "set gip_m_fd %d", gip_m_fd);
461 for (ki = ke_info_list; ki; ki = ki->next)
467 { /* child has exited */
468 gw_log (GW_LOG_DEBUG, module, "Close of %d", ki->id);
469 gipc_close (ki->gip);
470 gipc_destroy (ki->gip);
473 else if ((fd = gip_infileno (ki->gip)) != -1)
474 { /* read select on child FIFO */
475 gw_log (GW_LOG_DEBUG, module, "set fd %d", fd);
482 gw_log (GW_LOG_DEBUG, module, "Cur/Max processes %d/%d",
483 no_process, max_process);
484 gw_log (GW_LOG_DEBUG, module, "IPC select");
485 r = select (fd_max+1, &set_r, NULL, NULL, NULL);
489 { /* select aborted. And it was not due to interrupt */
490 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "select");
493 /* select was interrupted. Probably child has died */
494 gw_log (GW_LOG_DEBUG|GW_LOG_ERRNO, module, "select");
496 /* go through list of Email kernels. See if any message has arrived */
497 gw_log (GW_LOG_DEBUG, module, "Testing ke_info_list");
498 for (ki = ke_info_list; ki; ki = ki->next)
501 if (ki->gip && (fd = gip_infileno (ki->gip)) != -1)
503 gw_log (GW_LOG_DEBUG, module, "Test of %d", fd);
504 if (FD_ISSET (fd, &set_r))
506 if (lgets (line_buf, sizeof(line_buf)-1, fd))
508 gw_log (GW_LOG_DEBUG, module, "IPC: %s", line_buf);
512 gw_log (GW_LOG_DEBUG, module, "Close of %d", ki->id);
513 gipc_close (ki->gip);
514 gipc_destroy (ki->gip);
520 /* see if any message from eti has arrived */
521 gw_log (GW_LOG_DEBUG, module, "Testing gip_m_fd %d", gip_m_fd);
522 if (FD_ISSET (gip_m_fd, &set_r))
524 gw_log (GW_LOG_DEBUG, module, "Reading from %d", gip_m_fd);
525 if (!(lgets (command, sizeof(command)-1, gip_m_fd)))
527 gw_log (GW_LOG_FATAL, module, "Unexpected close");
530 gw_log (GW_LOG_DEBUG, module, "Done");
531 if ((cp = strchr (command, '\n')))
533 gw_log (GW_LOG_DEBUG, module, "IPC: %s", command);
534 if (!memcmp (command, "eti ", 4))
536 int id = atoi (command+4);
537 struct ke_info *new_k;
539 new_k = ke_info_add (id);
540 gw_log (GW_LOG_DEBUG, module, "Incoming mail %d", id);
544 if (!(new_k->queue = str_queue_mk ()))
546 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module,
551 str_queue_enq (new_k->queue, "mail\n");
552 while (lgets (line_buf, sizeof(line_buf)-1, gip_m_fd))
553 str_queue_enq (new_k->queue, line_buf);
554 str_queue_enq (new_k->queue, "\001");
561 * main: main of monitor
563 int main (int argc, char **argv)
568 while (++argno < argc)
570 if (argv[argno][0] == '-')
572 switch (argv[argno][1])
575 fprintf (stderr, "monitor [option..] [resource]\n");
576 fprintf (stderr, "If no resource file is given");
577 fprintf (stderr, " default.res is used\n");
578 fprintf (stderr, "Options are transferred to kernel\n");
581 gw_log_level (GW_LOG_ALL & ~RES_DEBUG);
584 gw_log_level (GW_LOG_ALL);
589 default_res = argv[argno];
592 signal (SIGCHLD, catch_child);
593 signal (SIGHUP, catch_hup);
594 signal (SIGTERM, catch_term);
595 signal (SIGINT, catch_int);
597 gw_log_level (GW_LOG_ALL & ~RES_DEBUG);
598 gw_log_file (GW_LOG_ALL, "monitor.log");
600 monitor_events (argc, argv);