1 /**
2 * collectd - src/exec.c
3 * Copyright (C) 2007-2009 Florian octo Forster
4 * Copyright (C) 2007-2009 Sebastian Harl
5 * Copyright (C) 2008 Peter Holik
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; only version 2 of the License is applicable.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Authors:
21 * Florian octo Forster <octo at verplant.org>
22 * Sebastian Harl <sh at tokkee.org>
23 * Peter Holik <peter at holik.at>
24 **/
26 #define _BSD_SOURCE /* For setgroups */
28 #include "collectd.h"
29 #include "common.h"
30 #include "plugin.h"
32 #include "utils_cmd_putval.h"
33 #include "utils_cmd_putnotif.h"
35 #include <sys/types.h>
36 #include <pwd.h>
37 #include <grp.h>
38 #include <signal.h>
40 #include <pthread.h>
42 #define PL_NORMAL 0x01
43 #define PL_NOTIF_ACTION 0x02
45 #define PL_RUNNING 0x10
47 /*
48 * Private data types
49 */
50 /*
51 * Access to this structure is serialized using the `pl_lock' lock and the
52 * `PL_RUNNING' flag. The execution of notifications is *not* serialized, so
53 * all functions used to handle notifications MUST NOT write to this structure.
54 * The `pid' and `status' fields are thus unused if the `PL_NOTIF_ACTION' flag
55 * is set.
56 * The `PL_RUNNING' flag is set in `exec_read' and unset in `exec_read_one'.
57 */
58 struct program_list_s;
59 typedef struct program_list_s program_list_t;
60 struct program_list_s
61 {
62 char *user;
63 char *group;
64 char *exec;
65 char **argv;
66 int pid;
67 int status;
68 int flags;
69 program_list_t *next;
70 };
72 typedef struct program_list_and_notification_s
73 {
74 program_list_t *pl;
75 notification_t n;
76 } program_list_and_notification_t;
78 /*
79 * Private variables
80 */
81 static program_list_t *pl_head = NULL;
82 static pthread_mutex_t pl_lock = PTHREAD_MUTEX_INITIALIZER;
84 /*
85 * Functions
86 */
87 static void sigchld_handler (int __attribute__((unused)) signal) /* {{{ */
88 {
89 pid_t pid;
90 int status;
91 while ((pid = waitpid (-1, &status, WNOHANG)) > 0)
92 {
93 program_list_t *pl;
94 for (pl = pl_head; pl != NULL; pl = pl->next)
95 if (pl->pid == pid)
96 break;
97 if (pl != NULL)
98 pl->status = status;
99 } /* while (waitpid) */
100 } /* void sigchld_handler }}} */
102 static int exec_config_exec (oconfig_item_t *ci) /* {{{ */
103 {
104 program_list_t *pl;
105 char buffer[128];
106 int i;
108 if (ci->children_num != 0)
109 {
110 WARNING ("exec plugin: The config option `%s' may not be a block.",
111 ci->key);
112 return (-1);
113 }
114 if (ci->values_num < 2)
115 {
116 WARNING ("exec plugin: The config option `%s' needs at least two "
117 "arguments.", ci->key);
118 return (-1);
119 }
120 if ((ci->values[0].type != OCONFIG_TYPE_STRING)
121 || (ci->values[1].type != OCONFIG_TYPE_STRING))
122 {
123 WARNING ("exec plugin: The first two arguments to the `%s' option must "
124 "be string arguments.", ci->key);
125 return (-1);
126 }
128 pl = (program_list_t *) malloc (sizeof (program_list_t));
129 if (pl == NULL)
130 {
131 ERROR ("exec plugin: malloc failed.");
132 return (-1);
133 }
134 memset (pl, '\0', sizeof (program_list_t));
136 if (strcasecmp ("NotificationExec", ci->key) == 0)
137 pl->flags |= PL_NOTIF_ACTION;
138 else
139 pl->flags |= PL_NORMAL;
141 pl->user = strdup (ci->values[0].value.string);
142 if (pl->user == NULL)
143 {
144 ERROR ("exec plugin: strdup failed.");
145 sfree (pl);
146 return (-1);
147 }
149 pl->group = strchr (pl->user, ':');
150 if (pl->group != NULL)
151 {
152 *pl->group = '\0';
153 pl->group++;
154 }
156 pl->exec = strdup (ci->values[1].value.string);
157 if (pl->exec == NULL)
158 {
159 ERROR ("exec plugin: strdup failed.");
160 sfree (pl->user);
161 sfree (pl);
162 return (-1);
163 }
165 pl->argv = (char **) malloc (ci->values_num * sizeof (char *));
166 if (pl->argv == NULL)
167 {
168 ERROR ("exec plugin: malloc failed.");
169 sfree (pl->exec);
170 sfree (pl->user);
171 sfree (pl);
172 return (-1);
173 }
174 memset (pl->argv, '\0', ci->values_num * sizeof (char *));
176 {
177 char *tmp = strrchr (ci->values[1].value.string, '/');
178 if (tmp == NULL)
179 sstrncpy (buffer, ci->values[1].value.string, sizeof (buffer));
180 else
181 sstrncpy (buffer, tmp + 1, sizeof (buffer));
182 }
183 pl->argv[0] = strdup (buffer);
184 if (pl->argv[0] == NULL)
185 {
186 ERROR ("exec plugin: malloc failed.");
187 sfree (pl->argv);
188 sfree (pl->exec);
189 sfree (pl->user);
190 sfree (pl);
191 return (-1);
192 }
194 for (i = 1; i < (ci->values_num - 1); i++)
195 {
196 if (ci->values[i + 1].type == OCONFIG_TYPE_STRING)
197 {
198 pl->argv[i] = strdup (ci->values[i + 1].value.string);
199 }
200 else
201 {
202 if (ci->values[i + 1].type == OCONFIG_TYPE_NUMBER)
203 {
204 ssnprintf (buffer, sizeof (buffer), "%lf",
205 ci->values[i + 1].value.number);
206 }
207 else
208 {
209 if (ci->values[i + 1].value.boolean)
210 sstrncpy (buffer, "true", sizeof (buffer));
211 else
212 sstrncpy (buffer, "false", sizeof (buffer));
213 }
215 pl->argv[i] = strdup (buffer);
216 }
218 if (pl->argv[i] == NULL)
219 {
220 ERROR ("exec plugin: strdup failed.");
221 break;
222 }
223 } /* for (i) */
225 if (i < (ci->values_num - 1))
226 {
227 while ((--i) >= 0)
228 {
229 sfree (pl->argv[i]);
230 }
231 sfree (pl->argv);
232 sfree (pl->exec);
233 sfree (pl->user);
234 sfree (pl);
235 return (-1);
236 }
238 for (i = 0; pl->argv[i] != NULL; i++)
239 {
240 DEBUG ("exec plugin: argv[%i] = %s", i, pl->argv[i]);
241 }
243 pl->next = pl_head;
244 pl_head = pl;
246 return (0);
247 } /* int exec_config_exec }}} */
249 static int exec_config (oconfig_item_t *ci) /* {{{ */
250 {
251 int i;
253 for (i = 0; i < ci->children_num; i++)
254 {
255 oconfig_item_t *child = ci->children + i;
256 if ((strcasecmp ("Exec", child->key) == 0)
257 || (strcasecmp ("NotificationExec", child->key) == 0))
258 exec_config_exec (child);
259 else
260 {
261 WARNING ("exec plugin: Unknown config option `%s'.", child->key);
262 }
263 } /* for (i) */
265 return (0);
266 } /* int exec_config }}} */
268 static void exec_child (program_list_t *pl) /* {{{ */
269 {
270 int status;
271 int uid;
272 int gid;
273 int egid;
275 struct passwd *sp_ptr;
276 struct passwd sp;
277 char nambuf[2048];
278 char errbuf[1024];
280 sp_ptr = NULL;
281 status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
282 if (status != 0)
283 {
284 ERROR ("exec plugin: getpwnam_r failed: %s",
285 sstrerror (errno, errbuf, sizeof (errbuf)));
286 exit (-1);
287 }
288 if (sp_ptr == NULL)
289 {
290 ERROR ("exec plugin: No such user: `%s'", pl->user);
291 exit (-1);
292 }
294 uid = sp.pw_uid;
295 gid = sp.pw_gid;
296 if (uid == 0)
297 {
298 ERROR ("exec plugin: Cowardly refusing to exec program as root.");
299 exit (-1);
300 }
302 /* The group configured in the configfile is set as effective group, because
303 * this way the forked process can (re-)gain the user's primary group. */
304 egid = -1;
305 if (NULL != pl->group)
306 {
307 if ('\0' != *pl->group) {
308 struct group *gr_ptr = NULL;
309 struct group gr;
311 status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
312 if (0 != status)
313 {
314 ERROR ("exec plugin: getgrnam_r failed: %s",
315 sstrerror (errno, errbuf, sizeof (errbuf)));
316 exit (-1);
317 }
318 if (NULL == gr_ptr)
319 {
320 ERROR ("exec plugin: No such group: `%s'", pl->group);
321 exit (-1);
322 }
324 egid = gr.gr_gid;
325 }
326 else
327 {
328 egid = gid;
329 }
330 } /* if (pl->group == NULL) */
332 #if HAVE_SETGROUPS
333 if (getuid () == 0)
334 {
335 gid_t glist[2];
336 size_t glist_len;
338 glist[0] = gid;
339 glist_len = 1;
341 if ((gid != egid) && (egid != -1))
342 {
343 glist[1] = egid;
344 glist_len = 2;
345 }
347 setgroups (glist_len, glist);
348 }
349 #endif /* HAVE_SETGROUPS */
351 status = setgid (gid);
352 if (status != 0)
353 {
354 ERROR ("exec plugin: setgid (%i) failed: %s",
355 gid, sstrerror (errno, errbuf, sizeof (errbuf)));
356 exit (-1);
357 }
359 if (egid != -1)
360 {
361 status = setegid (egid);
362 if (status != 0)
363 {
364 ERROR ("exec plugin: setegid (%i) failed: %s",
365 egid, sstrerror (errno, errbuf, sizeof (errbuf)));
366 exit (-1);
367 }
368 }
370 status = setuid (uid);
371 if (status != 0)
372 {
373 ERROR ("exec plugin: setuid (%i) failed: %s",
374 uid, sstrerror (errno, errbuf, sizeof (errbuf)));
375 exit (-1);
376 }
378 status = execvp (pl->exec, pl->argv);
380 ERROR ("exec plugin: exec failed: %s",
381 sstrerror (errno, errbuf, sizeof (errbuf)));
382 exit (-1);
383 } /* void exec_child }}} */
385 static void reset_signal_mask (void) /* {{{ */
386 {
387 sigset_t ss;
389 memset (&ss, 0, sizeof (ss));
390 sigemptyset (&ss);
391 sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
392 } /* }}} void reset_signal_mask */
394 /*
395 * Creates three pipes (one for reading, one for writing and one for errors),
396 * forks a child, sets up the pipes so that fd_in is connected to STDIN of
397 * the child and fd_out is connected to STDOUT and fd_err is connected to STDERR
398 * of the child. Then is calls `exec_child'.
399 */
400 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
401 {
402 int fd_pipe_in[2];
403 int fd_pipe_out[2];
404 int fd_pipe_err[2];
405 char errbuf[1024];
406 int status;
407 int pid;
409 if (pl->pid != 0)
410 return (-1);
412 status = pipe (fd_pipe_in);
413 if (status != 0)
414 {
415 ERROR ("exec plugin: pipe failed: %s",
416 sstrerror (errno, errbuf, sizeof (errbuf)));
417 return (-1);
418 }
420 status = pipe (fd_pipe_out);
421 if (status != 0)
422 {
423 ERROR ("exec plugin: pipe failed: %s",
424 sstrerror (errno, errbuf, sizeof (errbuf)));
425 return (-1);
426 }
428 status = pipe (fd_pipe_err);
429 if (status != 0)
430 {
431 ERROR ("exec plugin: pipe failed: %s",
432 sstrerror (errno, errbuf, sizeof (errbuf)));
433 return (-1);
434 }
436 pid = fork ();
437 if (pid < 0)
438 {
439 ERROR ("exec plugin: fork failed: %s",
440 sstrerror (errno, errbuf, sizeof (errbuf)));
441 return (-1);
442 }
443 else if (pid == 0)
444 {
445 int fd_num;
446 int fd;
448 /* Close all file descriptors but the pipe end we need. */
449 fd_num = getdtablesize ();
450 for (fd = 0; fd < fd_num; fd++)
451 {
452 if ((fd == fd_pipe_in[0])
453 || (fd == fd_pipe_out[1])
454 || (fd == fd_pipe_err[1]))
455 continue;
456 close (fd);
457 }
459 /* Connect the `in' pipe to STDIN */
460 if (fd_pipe_in[0] != STDIN_FILENO)
461 {
462 dup2 (fd_pipe_in[0], STDIN_FILENO);
463 close (fd_pipe_in[0]);
464 }
466 /* Now connect the `out' pipe to STDOUT */
467 if (fd_pipe_out[1] != STDOUT_FILENO)
468 {
469 dup2 (fd_pipe_out[1], STDOUT_FILENO);
470 close (fd_pipe_out[1]);
471 }
473 /* Now connect the `out' pipe to STDOUT */
474 if (fd_pipe_err[1] != STDERR_FILENO)
475 {
476 dup2 (fd_pipe_err[1], STDERR_FILENO);
477 close (fd_pipe_err[1]);
478 }
480 /* Unblock all signals */
481 reset_signal_mask ();
483 exec_child (pl);
484 /* does not return */
485 }
487 close (fd_pipe_in[0]);
488 close (fd_pipe_out[1]);
489 close (fd_pipe_err[1]);
491 if (fd_in != NULL)
492 *fd_in = fd_pipe_in[1];
493 else
494 close (fd_pipe_in[1]);
496 if (fd_out != NULL)
497 *fd_out = fd_pipe_out[0];
498 else
499 close (fd_pipe_out[0]);
501 if (fd_err != NULL)
502 *fd_err = fd_pipe_err[0];
503 else
504 close (fd_pipe_err[0]);
506 return (pid);
507 } /* int fork_child }}} */
509 static int parse_line (char *buffer) /* {{{ */
510 {
511 if (strncasecmp ("PUTVAL", buffer, strlen ("PUTVAL")) == 0)
512 return (handle_putval (stdout, buffer));
513 else if (strncasecmp ("PUTNOTIF", buffer, strlen ("PUTNOTIF")) == 0)
514 return (handle_putnotif (stdout, buffer));
515 else
516 {
517 /* For backwards compatibility */
518 char tmp[1220];
519 /* Let's annoy the user a bit.. */
520 INFO ("exec plugin: Prepending `PUTVAL' to this line: %s", buffer);
521 ssnprintf (tmp, sizeof (tmp), "PUTVAL %s", buffer);
522 return (handle_putval (stdout, tmp));
523 }
524 } /* int parse_line }}} */
526 static void *exec_read_one (void *arg) /* {{{ */
527 {
528 program_list_t *pl = (program_list_t *) arg;
529 int fd, fd_err, highest_fd;
530 fd_set fdset, copy;
531 int status;
532 char buffer[1200]; /* if not completely read */
533 char buffer_err[1024];
534 char *pbuffer = buffer;
535 char *pbuffer_err = buffer_err;
537 status = fork_child (pl, NULL, &fd, &fd_err);
538 if (status < 0)
539 pthread_exit ((void *) 1);
540 pl->pid = status;
542 assert (pl->pid != 0);
544 FD_ZERO( &fdset );
545 FD_SET(fd, &fdset);
546 FD_SET(fd_err, &fdset);
548 /* Determine the highest file descriptor */
549 highest_fd = (fd > fd_err) ? fd : fd_err;
551 /* We use a copy of fdset, as select modifies it */
552 copy = fdset;
554 while (select(highest_fd + 1, ©, NULL, NULL, NULL ) > 0)
555 {
556 int len;
558 if (FD_ISSET(fd, ©))
559 {
560 char *pnl;
562 len = read(fd, pbuffer, sizeof(buffer) - 1 - (pbuffer - buffer));
564 if (len < 0)
565 {
566 if (errno == EAGAIN || errno == EINTR) continue;
567 break;
568 }
569 else if (len == 0) break; /* We've reached EOF */
571 pbuffer[len] = '\0';
573 len += pbuffer - buffer;
574 pbuffer = buffer;
576 while ((pnl = strchr(pbuffer, '\n')))
577 {
578 *pnl = '\0';
579 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
581 parse_line (pbuffer);
583 pbuffer = ++pnl;
584 }
585 /* not completely read ? */
586 if (pbuffer - buffer < len)
587 {
588 len -= pbuffer - buffer;
589 memmove(buffer, pbuffer, len);
590 pbuffer = buffer + len;
591 }
592 else
593 pbuffer = buffer;
594 }
595 else if (FD_ISSET(fd_err, ©))
596 {
597 char *pnl;
599 len = read(fd_err, pbuffer_err, sizeof(buffer_err) - 1 - (pbuffer_err - buffer_err));
601 if (len < 0)
602 {
603 if (errno == EAGAIN || errno == EINTR) continue;
604 break;
605 }
606 else if (len == 0)
607 {
608 /* We've reached EOF */
609 NOTICE ("exec plugin: Program `%s' has closed STDERR.",
610 pl->exec);
611 close (fd_err);
612 FD_CLR (fd_err, &fdset);
613 highest_fd = fd;
614 fd_err = -1;
615 continue;
616 }
618 pbuffer_err[len] = '\0';
620 len += pbuffer_err - buffer_err;
621 pbuffer_err = buffer_err;
623 while ((pnl = strchr(pbuffer_err, '\n')))
624 {
625 *pnl = '\0';
626 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
628 ERROR ("exec plugin: exec_read_one: error = %s", pbuffer_err);
630 pbuffer_err = ++pnl;
631 }
632 /* not completely read ? */
633 if (pbuffer_err - buffer_err < len)
634 {
635 len -= pbuffer_err - buffer_err;
636 memmove(buffer_err, pbuffer_err, len);
637 pbuffer_err = buffer_err + len;
638 }
639 else
640 pbuffer_err = buffer_err;
641 }
642 /* reset copy */
643 copy = fdset;
644 }
646 DEBUG ("exec plugin: exec_read_one: Waiting for `%s' to exit.", pl->exec);
647 if (waitpid (pl->pid, &status, 0) > 0)
648 pl->status = status;
650 DEBUG ("exec plugin: Child %i exited with status %i.",
651 (int) pl->pid, pl->status);
653 pl->pid = 0;
655 pthread_mutex_lock (&pl_lock);
656 pl->flags &= ~PL_RUNNING;
657 pthread_mutex_unlock (&pl_lock);
659 close (fd);
660 if (fd_err >= 0)
661 close (fd_err);
663 pthread_exit ((void *) 0);
664 return (NULL);
665 } /* void *exec_read_one }}} */
667 static void *exec_notification_one (void *arg) /* {{{ */
668 {
669 program_list_t *pl = ((program_list_and_notification_t *) arg)->pl;
670 notification_t *n = &((program_list_and_notification_t *) arg)->n;
671 notification_meta_t *meta;
672 int fd;
673 FILE *fh;
674 int pid;
675 int status;
676 const char *severity;
678 pid = fork_child (pl, &fd, NULL, NULL);
679 if (pid < 0) {
680 sfree (arg);
681 pthread_exit ((void *) 1);
682 }
684 fh = fdopen (fd, "w");
685 if (fh == NULL)
686 {
687 char errbuf[1024];
688 ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
689 sstrerror (errno, errbuf, sizeof (errbuf)));
690 kill (pl->pid, SIGTERM);
691 pl->pid = 0;
692 close (fd);
693 sfree (arg);
694 pthread_exit ((void *) 1);
695 }
697 severity = "FAILURE";
698 if (n->severity == NOTIF_WARNING)
699 severity = "WARNING";
700 else if (n->severity == NOTIF_OKAY)
701 severity = "OKAY";
703 fprintf (fh,
704 "Severity: %s\n"
705 "Time: %u\n",
706 severity, (unsigned int) n->time);
708 /* Print the optional fields */
709 if (strlen (n->host) > 0)
710 fprintf (fh, "Host: %s\n", n->host);
711 if (strlen (n->plugin) > 0)
712 fprintf (fh, "Plugin: %s\n", n->plugin);
713 if (strlen (n->plugin_instance) > 0)
714 fprintf (fh, "PluginInstance: %s\n", n->plugin_instance);
715 if (strlen (n->type) > 0)
716 fprintf (fh, "Type: %s\n", n->type);
717 if (strlen (n->type_instance) > 0)
718 fprintf (fh, "TypeInstance: %s\n", n->type_instance);
720 for (meta = n->meta; meta != NULL; meta = meta->next)
721 {
722 if (meta->type == NM_TYPE_STRING)
723 fprintf (fh, "%s: %s\n", meta->name, meta->nm_value.nm_string);
724 else if (meta->type == NM_TYPE_SIGNED_INT)
725 fprintf (fh, "%s: %"PRIi64"\n", meta->name, meta->nm_value.nm_signed_int);
726 else if (meta->type == NM_TYPE_UNSIGNED_INT)
727 fprintf (fh, "%s: %"PRIu64"\n", meta->name, meta->nm_value.nm_unsigned_int);
728 else if (meta->type == NM_TYPE_DOUBLE)
729 fprintf (fh, "%s: %e\n", meta->name, meta->nm_value.nm_double);
730 else if (meta->type == NM_TYPE_BOOLEAN)
731 fprintf (fh, "%s: %s\n", meta->name,
732 meta->nm_value.nm_boolean ? "true" : "false");
733 }
735 fprintf (fh, "\n%s\n", n->message);
737 fflush (fh);
738 fclose (fh);
740 waitpid (pid, &status, 0);
742 DEBUG ("exec plugin: Child %i exited with status %i.",
743 pid, status);
745 if (n->meta != NULL)
746 plugin_notification_meta_free (n->meta);
747 n->meta = NULL;
748 sfree (arg);
749 pthread_exit ((void *) 0);
750 return (NULL);
751 } /* void *exec_notification_one }}} */
753 static int exec_init (void) /* {{{ */
754 {
755 struct sigaction sa;
757 memset (&sa, '\0', sizeof (sa));
758 sa.sa_handler = sigchld_handler;
759 sigaction (SIGCHLD, &sa, NULL);
761 return (0);
762 } /* int exec_init }}} */
764 static int exec_read (void) /* {{{ */
765 {
766 program_list_t *pl;
768 for (pl = pl_head; pl != NULL; pl = pl->next)
769 {
770 pthread_t t;
771 pthread_attr_t attr;
773 /* Only execute `normal' style executables here. */
774 if ((pl->flags & PL_NORMAL) == 0)
775 continue;
777 pthread_mutex_lock (&pl_lock);
778 /* Skip if a child is already running. */
779 if ((pl->flags & PL_RUNNING) != 0)
780 {
781 pthread_mutex_unlock (&pl_lock);
782 continue;
783 }
784 pl->flags |= PL_RUNNING;
785 pthread_mutex_unlock (&pl_lock);
787 pthread_attr_init (&attr);
788 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
789 pthread_create (&t, &attr, exec_read_one, (void *) pl);
790 } /* for (pl) */
792 return (0);
793 } /* int exec_read }}} */
795 static int exec_notification (const notification_t *n,
796 user_data_t __attribute__((unused)) *user_data)
797 {
798 program_list_t *pl;
799 program_list_and_notification_t *pln;
801 for (pl = pl_head; pl != NULL; pl = pl->next)
802 {
803 pthread_t t;
804 pthread_attr_t attr;
806 /* Only execute `notification' style executables here. */
807 if ((pl->flags & PL_NOTIF_ACTION) == 0)
808 continue;
810 /* Skip if a child is already running. */
811 if (pl->pid != 0)
812 continue;
814 pln = (program_list_and_notification_t *) malloc (sizeof
815 (program_list_and_notification_t));
816 if (pln == NULL)
817 {
818 ERROR ("exec plugin: malloc failed.");
819 continue;
820 }
822 pln->pl = pl;
823 memcpy (&pln->n, n, sizeof (notification_t));
825 /* Set the `meta' member to NULL, otherwise `plugin_notification_meta_copy'
826 * will run into an endless loop. */
827 pln->n.meta = NULL;
828 plugin_notification_meta_copy (&pln->n, n);
830 pthread_attr_init (&attr);
831 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
832 pthread_create (&t, &attr, exec_notification_one, (void *) pln);
833 } /* for (pl) */
835 return (0);
836 } /* }}} int exec_notification */
838 static int exec_shutdown (void) /* {{{ */
839 {
840 program_list_t *pl;
841 program_list_t *next;
843 pl = pl_head;
844 while (pl != NULL)
845 {
846 next = pl->next;
848 if (pl->pid > 0)
849 {
850 kill (pl->pid, SIGTERM);
851 INFO ("exec plugin: Sent SIGTERM to %hu", (unsigned short int) pl->pid);
852 }
854 sfree (pl->user);
855 sfree (pl);
857 pl = next;
858 } /* while (pl) */
859 pl_head = NULL;
861 return (0);
862 } /* int exec_shutdown }}} */
864 void module_register (void)
865 {
866 plugin_register_complex_config ("exec", exec_config);
867 plugin_register_init ("exec", exec_init);
868 plugin_register_read ("exec", exec_read);
869 plugin_register_notification ("exec", exec_notification,
870 /* user_data = */ NULL);
871 plugin_register_shutdown ("exec", exec_shutdown);
872 } /* void module_register */
874 /*
875 * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
876 */