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,
34 * EXPRESS, IMPLIED, OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
35 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
36 * IN NO EVENT SHALL THE EUROPAGATE CONSORTIUM OR ITS MEMBERS BE LIABLE
37 * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF
38 * ANY KIND, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
39 * OR PROFITS, WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND
40 * ON ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
41 * USE OR PERFORMANCE OF THIS SOFTWARE.
44 /* Gateway Resource Monitor
48 * Revision 1.11 1995/05/19 13:26:00 adam
49 * Bug fixes. Better command line options.
51 * Revision 1.10 1995/05/18 12:03:09 adam
52 * Bug fixes and minor improvements.
54 * Revision 1.9 1995/05/17 10:51:32 adam
55 * Added a few more error checks to the show command.
57 * Revision 1.8 1995/05/16 09:40:42 adam
58 * LICENSE. Setting of CCL token names (and/or/not/set) in read_kernel_res.
60 * Revision 1.7 1995/05/03 12:18:46 adam
61 * This code ran on dtbsun. Minor changes.
63 * Revision 1.6 1995/05/03 09:16:17 adam
66 * Revision 1.5 1995/05/03 07:37:42 adam
67 * CCL commands stop/continue implemented. New functions gw_res_{int,bool}
68 * are used when possible.
70 * Revision 1.4 1995/05/02 15:26:00 adam
71 * Monitor observes death of child (email kernel). The number
72 * of simultanous processes is controlled now. Email requests are
73 * queued if necessary. This scheme should only be forced if no kernels
76 * Revision 1.3 1995/05/02 07:20:10 adam
77 * Use pid of exited child to close fifos.
79 * Revision 1.2 1995/05/01 16:26:57 adam
80 * More work on resource monitor.
82 * Revision 1.1 1995/05/01 12:43:36 adam
83 * First work on resource monitor program.
100 #include <sys/types.h>
101 #include <sys/time.h>
102 #include <sys/wait.h>
107 #include <strqueue.h>
110 #define LINE_MAX 1024
112 #define MONITOR_FIFO_S "fifo.s.m"
113 #define MONITOR_FIFO_C "fifo.c.m"
115 static char *module = "monitor";
116 static jmp_buf retry_jmp;
118 static GwRes monitor_res = NULL;
119 static int no_process = 0;
120 static int max_process = 1;
121 static int got_sighup = 0;
122 static int got_term = 0;
123 static int got_int = 0;
124 const char *default_res = "default.res";
127 * reread_resources: reread monitor resources. The static variable,
128 * max_process, is updated.
130 static void reread_resources (void)
133 gw_res_close (monitor_res);
134 monitor_res = gw_res_init ();
135 if (gw_res_merge (monitor_res, default_res))
137 gw_log (GW_LOG_WARN, module, "Couldn't read resource file %s",
141 max_process = gw_res_int (monitor_res, "gw.max.process", 10);
145 int id; /* email user-id */
146 pid_t pid; /* pid of email kernel child */
147 GIP gip; /* fifo information */
148 struct str_queue *queue; /* message queue */
149 struct ke_info *next; /* link to next */
152 /* list of email kernel infos */
153 static struct ke_info *ke_info_list = NULL;
156 * ke_info_add: add/lookup of email kernel info.
157 * id: email user-id to search for.
158 * return: pointer to info structure.
160 struct ke_info *ke_info_add (int id)
162 struct ke_info **kip;
164 for (kip = &ke_info_list; *kip; kip= &(*kip)->next)
165 if ((*kip)->id == id)
167 *kip = malloc (sizeof(**kip));
172 (*kip)->queue = NULL;
176 static void ke_info_del (void)
180 assert (ke_info_list);
182 str_queue_rm (&ki->queue);
183 ke_info_list = ki->next;
188 * catch_child: catch SIGCHLD. Set email kernel pid to -1
189 * to indicate that child has exited
191 static void catch_child (int num)
196 while ((pid=waitpid (-1, 0, WNOHANG)) > 0)
198 for (ki = ke_info_list; ki; ki = ki->next)
203 signal (SIGCHLD, catch_child);
207 * catch_int: catch SIGHUP.
209 static void catch_hup (int num)
212 signal (SIGHUP, catch_hup);
216 * catch_int: catch SIGTERM.
218 static void catch_term (int num)
221 signal (SIGTERM, catch_term);
225 * catch_int: catch SIGINT.
227 static void catch_int (int num)
230 signal (SIGINT, catch_int);
234 * pipe_handle: handle SIGPIPE when transferring message to kernel
236 static void pipe_handle (int dummy)
238 longjmp (retry_jmp, 1);
242 * start_kernel: start email kernel.
243 * argc: argc of email kernel
244 * argv: argv of email kernel
246 * return: pid of email kernel child
248 static pid_t start_kernel (int argc, char **argv, int id)
253 char userid_option[20];
255 argv_p = malloc (sizeof(*argv_p)*(argc+2));
258 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "malloc fail");
261 argv_p[0] = "kernel";
262 for (i = 1; i<argc; i++)
264 sprintf (userid_option, "-i%d", id);
265 argv_p[i++] = userid_option;
268 gw_log (GW_LOG_DEBUG, module, "Starting kernel");
272 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "fork");
277 execv ("kernel", argv_p);
278 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "execvp");
285 * deliver: deliver message to child (email kernel).
286 * argc: exec argc to child (if it need to be started)
287 * argv: exec argv to child (if it need to be started)
289 * queue: message queue to be transferred
290 * gip: pointer to FIFO info. if *gip is NULL prior invocation
291 * it will be created (initialized) and the pointer will be
293 * pidp: pointer to pid. Will hold process-id of child (if it need to
295 * dont_exec: if non-zero a child will never be started; otherwise child
296 * will be started if not already running.
297 * return: 0 if message couldn't be transferred, i.e. dont_exec is non-zero
298 * and the child is not already running.
299 * 1 if message was transferred and the child was already running.
300 * 2 if message was transferred and the child was started and
301 * dont_exec was zero.
302 * 3 serious error. Permissions denied or kernel couldn't be
305 static int deliver (int argc, char **argv, int id, struct str_queue *queue,
306 GIP *gip, pid_t *pidp, int dont_exec)
311 char fifo_server_name[128];
312 char fifo_client_name[128];
316 sprintf (fifo_server_name, "fifo.s.%d", id);
317 sprintf (fifo_client_name, "fifo.c.%d", id);
321 *gip = gipc_initialize (fifo_client_name);
323 oldsig = signal (SIGPIPE, pipe_handle);
327 { /* assume child is running */
328 gipc_close (*gip); /* shut down existing FIFOs */
329 r = gipc_open (*gip, fifo_server_name, 0); /* try re-open ... */
332 { /* assume child is NOT running */
336 { /* we aren't allowed to start */
337 signal (SIGPIPE, oldsig);
340 mknod (fifo_server_name, S_IFIFO|0666, 0);
341 pid = start_kernel (argc, argv, id);
342 if (pidp) /* set pid of child */
344 r = gipc_open (*gip, fifo_server_name, 1);
347 { /* message couldn't be transferred */
348 signal (SIGPIPE, oldsig);
349 gw_log (GW_LOG_WARN, module, "Cannot start kernel");
352 if (r < 0) /* gipc_open fail? */
355 gw_log (GW_LOG_DEBUG|GW_LOG_ERRNO, module, "r==-2");
357 gw_log (GW_LOG_DEBUG|GW_LOG_ERRNO, module, "r==-1");
359 gw_log (GW_LOG_WARN|GW_LOG_ERRNO, module, "gipc_open");
360 longjmp (retry_jmp, 1); /* yet another pass */
362 index = 0; /* transfer. may be interrupted */
363 while ((msg = str_queue_get (queue, index++)))
364 gip_wline (*gip, msg);
365 signal (SIGPIPE, oldsig);
366 return pass; /* successful transfer */
370 * monitor_events: Event loop of monitor
371 * argc: argc of monitor (used in exec of Email kernel children)
372 * argv: argv of monitor (used in exec of Email kernel children)
374 static void monitor_events (int argc, char **argv)
377 int r, gip_m_fd, too_many;
380 char command[128], *cp;
382 mknod (MONITOR_FIFO_C, S_IFIFO|0666, 0);
383 open (MONITOR_FIFO_C, O_RDONLY|O_NONBLOCK);
384 gip_m = gips_initialize (MONITOR_FIFO_S);
385 r = gips_open (gip_m, MONITOR_FIFO_C, 0);
386 gip_m_fd = gip_infileno (gip_m);
397 gw_log (GW_LOG_STAT, module, "Got SIGHUP. Reading resources");
403 gw_log (GW_LOG_STAT, module, "Got SIGTERM. Exiting...");
404 unlink (MONITOR_FIFO_S);
405 unlink (MONITOR_FIFO_C);
410 gw_log (GW_LOG_STAT, module, "Got SIGINT. Exiting...");
411 unlink (MONITOR_FIFO_S);
412 unlink (MONITOR_FIFO_C);
415 /* deliver any unsent messages to Email kernels */
417 for (ki = ke_info_list; ki; ki = ki->next)
421 gw_log (GW_LOG_DEBUG, module, "Transfer mail to %d", ki->id);
422 r = deliver (argc, argv, ki->id, ki->queue, &ki->gip, &ki->pid,
423 no_process >= max_process);
424 if (r == 2) /* new child was spawned? */
427 gw_log (GW_LOG_DEBUG, module, "Start of %d", ki->id);
429 if (r == 1 || r == 2) /* transfer at all? */
430 str_queue_rm (&ki->queue);
431 if (r == 0) /* too many pending? */
437 gw_log (GW_LOG_DEBUG, module, "%d too many pending",
439 for (ki = ke_info_list; ki; ki = ki->next)
441 if (!ki->queue && ki->pid != -1)
443 if (!(ki->queue = str_queue_mk ()))
445 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module,
449 str_queue_enq (ki->queue, "stop\n");
450 str_queue_enq (ki->queue, "\001");
451 r = deliver (argc, argv, ki->id, ki->queue, &ki->gip,
454 gw_log (GW_LOG_DEBUG, module,
455 "Stop not sent: %d", r);
456 str_queue_rm (&ki->queue);
463 FD_SET (gip_m_fd, &set_r);
464 gw_log (GW_LOG_DEBUG, module, "set gip_m_fd %d", gip_m_fd);
467 for (ki = ke_info_list; ki; ki = ki->next)
473 { /* child has exited */
474 gw_log (GW_LOG_DEBUG, module, "Close of %d", ki->id);
475 gipc_close (ki->gip);
476 gipc_destroy (ki->gip);
479 else if ((fd = gip_infileno (ki->gip)) != -1)
480 { /* read select on child FIFO */
481 gw_log (GW_LOG_DEBUG, module, "set fd %d", fd);
488 gw_log (GW_LOG_DEBUG, module, "Cur/Max processes %d/%d",
489 no_process, max_process);
490 gw_log (GW_LOG_DEBUG, module, "IPC select");
491 r = select (fd_max+1, &set_r, NULL, NULL, NULL);
495 { /* select aborted. And it was not due to interrupt */
496 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "select");
499 /* select was interrupted. Probably child has died */
500 gw_log (GW_LOG_DEBUG|GW_LOG_ERRNO, module, "select");
502 /* go through list of Email kernels. See if any message has arrived */
503 gw_log (GW_LOG_DEBUG, module, "Testing ke_info_list");
504 for (ki = ke_info_list; ki; ki = ki->next)
507 if (ki->gip && (fd = gip_infileno (ki->gip)) != -1)
509 gw_log (GW_LOG_DEBUG, module, "Test of %d", fd);
510 if (FD_ISSET (fd, &set_r))
512 if (lgets (line_buf, sizeof(line_buf)-1, fd))
514 gw_log (GW_LOG_DEBUG, module, "IPC: %s", line_buf);
518 gw_log (GW_LOG_DEBUG, module, "Close of %d", ki->id);
519 gipc_close (ki->gip);
520 gipc_destroy (ki->gip);
526 /* see if any message from eti has arrived */
527 gw_log (GW_LOG_DEBUG, module, "Testing gip_m_fd %d", gip_m_fd);
528 if (FD_ISSET (gip_m_fd, &set_r))
530 gw_log (GW_LOG_DEBUG, module, "Reading from %d", gip_m_fd);
531 if (!(lgets (command, sizeof(command)-1, gip_m_fd)))
533 gw_log (GW_LOG_FATAL, module, "Unexpected close");
536 gw_log (GW_LOG_DEBUG, module, "Done");
537 if ((cp = strchr (command, '\n')))
539 gw_log (GW_LOG_DEBUG, module, "IPC: %s", command);
540 if (!memcmp (command, "eti ", 4))
542 int id = atoi (command+4);
543 struct ke_info *new_k;
545 new_k = ke_info_add (id);
546 gw_log (GW_LOG_DEBUG, module, "Incoming mail %d", id);
550 if (!(new_k->queue = str_queue_mk ()))
552 gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module,
557 str_queue_enq (new_k->queue, "mail\n");
558 while (lgets (line_buf, sizeof(line_buf)-1, gip_m_fd))
559 str_queue_enq (new_k->queue, line_buf);
560 str_queue_enq (new_k->queue, "\001");
567 * main: main of monitor
569 int main (int argc, char **argv)
574 while (++argno < argc)
576 if (argv[argno][0] == '-')
578 if (argv[argno][1] == '-')
580 switch (argv[argno][1])
584 fprintf (stderr, "monitor [options] [resourceFile]"
585 " -- [kernelOptions]\n");
586 fprintf (stderr, "If no resource file is specified");
587 fprintf (stderr, " default.res is used\n");
588 fprintf (stderr, "Options:\n");
589 fprintf (stderr, " -l log Set Log file\n");
590 fprintf (stderr, " -d Enable debugging log\n");
591 fprintf (stderr, " -D Enable more debugging log\n");
592 fprintf (stderr, " -- Precedes kernel options\n");
593 fprintf (stderr, "Kernel options are transferred to kernel\n");
597 gw_log_file (GW_LOG_ALL, argv[argno]+2);
598 else if (++argno < argc)
599 gw_log_file (GW_LOG_ALL, argv[argno]);
602 fprintf (stderr, "%s: missing log filename\n", *argv);
607 gw_log_level (GW_LOG_ALL & ~RES_DEBUG);
610 gw_log_level (GW_LOG_ALL);
613 fprintf (stderr, "%s: unknown option `%s'; use -H for help\n",
619 default_res = argv[argno];
622 signal (SIGCHLD, catch_child);
623 signal (SIGHUP, catch_hup);
624 signal (SIGTERM, catch_term);
625 signal (SIGINT, catch_int);
626 monitor_events (argc-argno, argv+argno);