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: Failed to get user information for user ``%s'': %s",
285 pl->user, 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: Failed to get group information "
315 "for group ``%s'': %s", pl->group,
316 sstrerror (errno, errbuf, sizeof (errbuf)));
317 exit (-1);
318 }
319 if (NULL == gr_ptr)
320 {
321 ERROR ("exec plugin: No such group: `%s'", pl->group);
322 exit (-1);
323 }
325 egid = gr.gr_gid;
326 }
327 else
328 {
329 egid = gid;
330 }
331 } /* if (pl->group == NULL) */
333 #if HAVE_SETGROUPS
334 if (getuid () == 0)
335 {
336 gid_t glist[2];
337 size_t glist_len;
339 glist[0] = gid;
340 glist_len = 1;
342 if ((gid != egid) && (egid != -1))
343 {
344 glist[1] = egid;
345 glist_len = 2;
346 }
348 setgroups (glist_len, glist);
349 }
350 #endif /* HAVE_SETGROUPS */
352 status = setgid (gid);
353 if (status != 0)
354 {
355 ERROR ("exec plugin: setgid (%i) failed: %s",
356 gid, sstrerror (errno, errbuf, sizeof (errbuf)));
357 exit (-1);
358 }
360 if (egid != -1)
361 {
362 status = setegid (egid);
363 if (status != 0)
364 {
365 ERROR ("exec plugin: setegid (%i) failed: %s",
366 egid, sstrerror (errno, errbuf, sizeof (errbuf)));
367 exit (-1);
368 }
369 }
371 status = setuid (uid);
372 if (status != 0)
373 {
374 ERROR ("exec plugin: setuid (%i) failed: %s",
375 uid, sstrerror (errno, errbuf, sizeof (errbuf)));
376 exit (-1);
377 }
379 status = execvp (pl->exec, pl->argv);
381 ERROR ("exec plugin: Failed to execute ``%s'': %s",
382 pl->exec, sstrerror (errno, errbuf, sizeof (errbuf)));
383 exit (-1);
384 } /* void exec_child }}} */
386 static void reset_signal_mask (void) /* {{{ */
387 {
388 sigset_t ss;
390 memset (&ss, 0, sizeof (ss));
391 sigemptyset (&ss);
392 sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
393 } /* }}} void reset_signal_mask */
395 /*
396 * Creates three pipes (one for reading, one for writing and one for errors),
397 * forks a child, sets up the pipes so that fd_in is connected to STDIN of
398 * the child and fd_out is connected to STDOUT and fd_err is connected to STDERR
399 * of the child. Then is calls `exec_child'.
400 */
401 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
402 {
403 int fd_pipe_in[2];
404 int fd_pipe_out[2];
405 int fd_pipe_err[2];
406 char errbuf[1024];
407 int status;
408 int pid;
410 if (pl->pid != 0)
411 return (-1);
413 status = pipe (fd_pipe_in);
414 if (status != 0)
415 {
416 ERROR ("exec plugin: pipe failed: %s",
417 sstrerror (errno, errbuf, sizeof (errbuf)));
418 return (-1);
419 }
421 status = pipe (fd_pipe_out);
422 if (status != 0)
423 {
424 ERROR ("exec plugin: pipe failed: %s",
425 sstrerror (errno, errbuf, sizeof (errbuf)));
426 return (-1);
427 }
429 status = pipe (fd_pipe_err);
430 if (status != 0)
431 {
432 ERROR ("exec plugin: pipe failed: %s",
433 sstrerror (errno, errbuf, sizeof (errbuf)));
434 return (-1);
435 }
437 pid = fork ();
438 if (pid < 0)
439 {
440 ERROR ("exec plugin: fork failed: %s",
441 sstrerror (errno, errbuf, sizeof (errbuf)));
442 return (-1);
443 }
444 else if (pid == 0)
445 {
446 int fd_num;
447 int fd;
449 /* Close all file descriptors but the pipe end we need. */
450 fd_num = getdtablesize ();
451 for (fd = 0; fd < fd_num; fd++)
452 {
453 if ((fd == fd_pipe_in[0])
454 || (fd == fd_pipe_out[1])
455 || (fd == fd_pipe_err[1]))
456 continue;
457 close (fd);
458 }
460 /* Connect the `in' pipe to STDIN */
461 if (fd_pipe_in[0] != STDIN_FILENO)
462 {
463 dup2 (fd_pipe_in[0], STDIN_FILENO);
464 close (fd_pipe_in[0]);
465 }
467 /* Now connect the `out' pipe to STDOUT */
468 if (fd_pipe_out[1] != STDOUT_FILENO)
469 {
470 dup2 (fd_pipe_out[1], STDOUT_FILENO);
471 close (fd_pipe_out[1]);
472 }
474 /* Now connect the `out' pipe to STDOUT */
475 if (fd_pipe_err[1] != STDERR_FILENO)
476 {
477 dup2 (fd_pipe_err[1], STDERR_FILENO);
478 close (fd_pipe_err[1]);
479 }
481 /* Unblock all signals */
482 reset_signal_mask ();
484 exec_child (pl);
485 /* does not return */
486 }
488 close (fd_pipe_in[0]);
489 close (fd_pipe_out[1]);
490 close (fd_pipe_err[1]);
492 if (fd_in != NULL)
493 *fd_in = fd_pipe_in[1];
494 else
495 close (fd_pipe_in[1]);
497 if (fd_out != NULL)
498 *fd_out = fd_pipe_out[0];
499 else
500 close (fd_pipe_out[0]);
502 if (fd_err != NULL)
503 *fd_err = fd_pipe_err[0];
504 else
505 close (fd_pipe_err[0]);
507 return (pid);
508 } /* int fork_child }}} */
510 static int parse_line (char *buffer) /* {{{ */
511 {
512 if (strncasecmp ("PUTVAL", buffer, strlen ("PUTVAL")) == 0)
513 return (handle_putval (stdout, buffer));
514 else if (strncasecmp ("PUTNOTIF", buffer, strlen ("PUTNOTIF")) == 0)
515 return (handle_putnotif (stdout, buffer));
516 else
517 {
518 /* For backwards compatibility */
519 char tmp[1220];
520 /* Let's annoy the user a bit.. */
521 INFO ("exec plugin: Prepending `PUTVAL' to this line: %s", buffer);
522 ssnprintf (tmp, sizeof (tmp), "PUTVAL %s", buffer);
523 return (handle_putval (stdout, tmp));
524 }
525 } /* int parse_line }}} */
527 static void *exec_read_one (void *arg) /* {{{ */
528 {
529 program_list_t *pl = (program_list_t *) arg;
530 int fd, fd_err, highest_fd;
531 fd_set fdset, copy;
532 int status;
533 char buffer[1200]; /* if not completely read */
534 char buffer_err[1024];
535 char *pbuffer = buffer;
536 char *pbuffer_err = buffer_err;
538 status = fork_child (pl, NULL, &fd, &fd_err);
539 if (status < 0)
540 pthread_exit ((void *) 1);
541 pl->pid = status;
543 assert (pl->pid != 0);
545 FD_ZERO( &fdset );
546 FD_SET(fd, &fdset);
547 FD_SET(fd_err, &fdset);
549 /* Determine the highest file descriptor */
550 highest_fd = (fd > fd_err) ? fd : fd_err;
552 /* We use a copy of fdset, as select modifies it */
553 copy = fdset;
555 while (select(highest_fd + 1, ©, NULL, NULL, NULL ) > 0)
556 {
557 int len;
559 if (FD_ISSET(fd, ©))
560 {
561 char *pnl;
563 len = read(fd, pbuffer, sizeof(buffer) - 1 - (pbuffer - buffer));
565 if (len < 0)
566 {
567 if (errno == EAGAIN || errno == EINTR) continue;
568 break;
569 }
570 else if (len == 0) break; /* We've reached EOF */
572 pbuffer[len] = '\0';
574 len += pbuffer - buffer;
575 pbuffer = buffer;
577 while ((pnl = strchr(pbuffer, '\n')))
578 {
579 *pnl = '\0';
580 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
582 parse_line (pbuffer);
584 pbuffer = ++pnl;
585 }
586 /* not completely read ? */
587 if (pbuffer - buffer < len)
588 {
589 len -= pbuffer - buffer;
590 memmove(buffer, pbuffer, len);
591 pbuffer = buffer + len;
592 }
593 else
594 pbuffer = buffer;
595 }
596 else if (FD_ISSET(fd_err, ©))
597 {
598 char *pnl;
600 len = read(fd_err, pbuffer_err, sizeof(buffer_err) - 1 - (pbuffer_err - buffer_err));
602 if (len < 0)
603 {
604 if (errno == EAGAIN || errno == EINTR) continue;
605 break;
606 }
607 else if (len == 0)
608 {
609 /* We've reached EOF */
610 NOTICE ("exec plugin: Program `%s' has closed STDERR.",
611 pl->exec);
612 close (fd_err);
613 FD_CLR (fd_err, &fdset);
614 highest_fd = fd;
615 fd_err = -1;
616 continue;
617 }
619 pbuffer_err[len] = '\0';
621 len += pbuffer_err - buffer_err;
622 pbuffer_err = buffer_err;
624 while ((pnl = strchr(pbuffer_err, '\n')))
625 {
626 *pnl = '\0';
627 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
629 ERROR ("exec plugin: exec_read_one: error = %s", pbuffer_err);
631 pbuffer_err = ++pnl;
632 }
633 /* not completely read ? */
634 if (pbuffer_err - buffer_err < len)
635 {
636 len -= pbuffer_err - buffer_err;
637 memmove(buffer_err, pbuffer_err, len);
638 pbuffer_err = buffer_err + len;
639 }
640 else
641 pbuffer_err = buffer_err;
642 }
643 /* reset copy */
644 copy = fdset;
645 }
647 DEBUG ("exec plugin: exec_read_one: Waiting for `%s' to exit.", pl->exec);
648 if (waitpid (pl->pid, &status, 0) > 0)
649 pl->status = status;
651 DEBUG ("exec plugin: Child %i exited with status %i.",
652 (int) pl->pid, pl->status);
654 pl->pid = 0;
656 pthread_mutex_lock (&pl_lock);
657 pl->flags &= ~PL_RUNNING;
658 pthread_mutex_unlock (&pl_lock);
660 close (fd);
661 if (fd_err >= 0)
662 close (fd_err);
664 pthread_exit ((void *) 0);
665 return (NULL);
666 } /* void *exec_read_one }}} */
668 static void *exec_notification_one (void *arg) /* {{{ */
669 {
670 program_list_t *pl = ((program_list_and_notification_t *) arg)->pl;
671 notification_t *n = &((program_list_and_notification_t *) arg)->n;
672 notification_meta_t *meta;
673 int fd;
674 FILE *fh;
675 int pid;
676 int status;
677 const char *severity;
679 pid = fork_child (pl, &fd, NULL, NULL);
680 if (pid < 0) {
681 sfree (arg);
682 pthread_exit ((void *) 1);
683 }
685 fh = fdopen (fd, "w");
686 if (fh == NULL)
687 {
688 char errbuf[1024];
689 ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
690 sstrerror (errno, errbuf, sizeof (errbuf)));
691 kill (pl->pid, SIGTERM);
692 pl->pid = 0;
693 close (fd);
694 sfree (arg);
695 pthread_exit ((void *) 1);
696 }
698 severity = "FAILURE";
699 if (n->severity == NOTIF_WARNING)
700 severity = "WARNING";
701 else if (n->severity == NOTIF_OKAY)
702 severity = "OKAY";
704 fprintf (fh,
705 "Severity: %s\n"
706 "Time: %u\n",
707 severity, (unsigned int) n->time);
709 /* Print the optional fields */
710 if (strlen (n->host) > 0)
711 fprintf (fh, "Host: %s\n", n->host);
712 if (strlen (n->plugin) > 0)
713 fprintf (fh, "Plugin: %s\n", n->plugin);
714 if (strlen (n->plugin_instance) > 0)
715 fprintf (fh, "PluginInstance: %s\n", n->plugin_instance);
716 if (strlen (n->type) > 0)
717 fprintf (fh, "Type: %s\n", n->type);
718 if (strlen (n->type_instance) > 0)
719 fprintf (fh, "TypeInstance: %s\n", n->type_instance);
721 for (meta = n->meta; meta != NULL; meta = meta->next)
722 {
723 if (meta->type == NM_TYPE_STRING)
724 fprintf (fh, "%s: %s\n", meta->name, meta->nm_value.nm_string);
725 else if (meta->type == NM_TYPE_SIGNED_INT)
726 fprintf (fh, "%s: %"PRIi64"\n", meta->name, meta->nm_value.nm_signed_int);
727 else if (meta->type == NM_TYPE_UNSIGNED_INT)
728 fprintf (fh, "%s: %"PRIu64"\n", meta->name, meta->nm_value.nm_unsigned_int);
729 else if (meta->type == NM_TYPE_DOUBLE)
730 fprintf (fh, "%s: %e\n", meta->name, meta->nm_value.nm_double);
731 else if (meta->type == NM_TYPE_BOOLEAN)
732 fprintf (fh, "%s: %s\n", meta->name,
733 meta->nm_value.nm_boolean ? "true" : "false");
734 }
736 fprintf (fh, "\n%s\n", n->message);
738 fflush (fh);
739 fclose (fh);
741 waitpid (pid, &status, 0);
743 DEBUG ("exec plugin: Child %i exited with status %i.",
744 pid, status);
746 if (n->meta != NULL)
747 plugin_notification_meta_free (n->meta);
748 n->meta = NULL;
749 sfree (arg);
750 pthread_exit ((void *) 0);
751 return (NULL);
752 } /* void *exec_notification_one }}} */
754 static int exec_init (void) /* {{{ */
755 {
756 struct sigaction sa;
758 memset (&sa, '\0', sizeof (sa));
759 sa.sa_handler = sigchld_handler;
760 sigaction (SIGCHLD, &sa, NULL);
762 return (0);
763 } /* int exec_init }}} */
765 static int exec_read (void) /* {{{ */
766 {
767 program_list_t *pl;
769 for (pl = pl_head; pl != NULL; pl = pl->next)
770 {
771 pthread_t t;
772 pthread_attr_t attr;
774 /* Only execute `normal' style executables here. */
775 if ((pl->flags & PL_NORMAL) == 0)
776 continue;
778 pthread_mutex_lock (&pl_lock);
779 /* Skip if a child is already running. */
780 if ((pl->flags & PL_RUNNING) != 0)
781 {
782 pthread_mutex_unlock (&pl_lock);
783 continue;
784 }
785 pl->flags |= PL_RUNNING;
786 pthread_mutex_unlock (&pl_lock);
788 pthread_attr_init (&attr);
789 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
790 pthread_create (&t, &attr, exec_read_one, (void *) pl);
791 } /* for (pl) */
793 return (0);
794 } /* int exec_read }}} */
796 static int exec_notification (const notification_t *n,
797 user_data_t __attribute__((unused)) *user_data)
798 {
799 program_list_t *pl;
800 program_list_and_notification_t *pln;
802 for (pl = pl_head; pl != NULL; pl = pl->next)
803 {
804 pthread_t t;
805 pthread_attr_t attr;
807 /* Only execute `notification' style executables here. */
808 if ((pl->flags & PL_NOTIF_ACTION) == 0)
809 continue;
811 /* Skip if a child is already running. */
812 if (pl->pid != 0)
813 continue;
815 pln = (program_list_and_notification_t *) malloc (sizeof
816 (program_list_and_notification_t));
817 if (pln == NULL)
818 {
819 ERROR ("exec plugin: malloc failed.");
820 continue;
821 }
823 pln->pl = pl;
824 memcpy (&pln->n, n, sizeof (notification_t));
826 /* Set the `meta' member to NULL, otherwise `plugin_notification_meta_copy'
827 * will run into an endless loop. */
828 pln->n.meta = NULL;
829 plugin_notification_meta_copy (&pln->n, n);
831 pthread_attr_init (&attr);
832 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
833 pthread_create (&t, &attr, exec_notification_one, (void *) pln);
834 } /* for (pl) */
836 return (0);
837 } /* }}} int exec_notification */
839 static int exec_shutdown (void) /* {{{ */
840 {
841 program_list_t *pl;
842 program_list_t *next;
844 pl = pl_head;
845 while (pl != NULL)
846 {
847 next = pl->next;
849 if (pl->pid > 0)
850 {
851 kill (pl->pid, SIGTERM);
852 INFO ("exec plugin: Sent SIGTERM to %hu", (unsigned short int) pl->pid);
853 }
855 sfree (pl->user);
856 sfree (pl);
858 pl = next;
859 } /* while (pl) */
860 pl_head = NULL;
862 return (0);
863 } /* int exec_shutdown }}} */
865 void module_register (void)
866 {
867 plugin_register_complex_config ("exec", exec_config);
868 plugin_register_init ("exec", exec_init);
869 plugin_register_read ("exec", exec_read);
870 plugin_register_notification ("exec", exec_notification,
871 /* user_data = */ NULL);
872 plugin_register_shutdown ("exec", exec_shutdown);
873 } /* void module_register */
875 /*
876 * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
877 */