1 /**
2 * collectd - src/exec.c
3 * Copyright (C) 2007-2010 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 __attribute__((noreturn))
269 static void exec_child (program_list_t *pl) /* {{{ */
270 {
271 int status;
272 int uid;
273 int gid;
274 int egid;
276 struct passwd *sp_ptr;
277 struct passwd sp;
278 char nambuf[2048];
279 char errbuf[1024];
281 sp_ptr = NULL;
282 status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
283 if (status != 0)
284 {
285 ERROR ("exec plugin: Failed to get user information for user ``%s'': %s",
286 pl->user, sstrerror (errno, errbuf, sizeof (errbuf)));
287 exit (-1);
288 }
289 if (sp_ptr == NULL)
290 {
291 ERROR ("exec plugin: No such user: `%s'", pl->user);
292 exit (-1);
293 }
295 uid = sp.pw_uid;
296 gid = sp.pw_gid;
297 if (uid == 0)
298 {
299 ERROR ("exec plugin: Cowardly refusing to exec program as root.");
300 exit (-1);
301 }
303 /* The group configured in the configfile is set as effective group, because
304 * this way the forked process can (re-)gain the user's primary group. */
305 egid = -1;
306 if (NULL != pl->group)
307 {
308 if ('\0' != *pl->group) {
309 struct group *gr_ptr = NULL;
310 struct group gr;
312 status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
313 if (0 != status)
314 {
315 ERROR ("exec plugin: Failed to get group information "
316 "for group ``%s'': %s", pl->group,
317 sstrerror (errno, errbuf, sizeof (errbuf)));
318 exit (-1);
319 }
320 if (NULL == gr_ptr)
321 {
322 ERROR ("exec plugin: No such group: `%s'", pl->group);
323 exit (-1);
324 }
326 egid = gr.gr_gid;
327 }
328 else
329 {
330 egid = gid;
331 }
332 } /* if (pl->group == NULL) */
334 #if HAVE_SETGROUPS
335 if (getuid () == 0)
336 {
337 gid_t glist[2];
338 size_t glist_len;
340 glist[0] = gid;
341 glist_len = 1;
343 if ((gid != egid) && (egid != -1))
344 {
345 glist[1] = egid;
346 glist_len = 2;
347 }
349 setgroups (glist_len, glist);
350 }
351 #endif /* HAVE_SETGROUPS */
353 status = setgid (gid);
354 if (status != 0)
355 {
356 ERROR ("exec plugin: setgid (%i) failed: %s",
357 gid, sstrerror (errno, errbuf, sizeof (errbuf)));
358 exit (-1);
359 }
361 if (egid != -1)
362 {
363 status = setegid (egid);
364 if (status != 0)
365 {
366 ERROR ("exec plugin: setegid (%i) failed: %s",
367 egid, sstrerror (errno, errbuf, sizeof (errbuf)));
368 exit (-1);
369 }
370 }
372 status = setuid (uid);
373 if (status != 0)
374 {
375 ERROR ("exec plugin: setuid (%i) failed: %s",
376 uid, sstrerror (errno, errbuf, sizeof (errbuf)));
377 exit (-1);
378 }
380 status = execvp (pl->exec, pl->argv);
382 ERROR ("exec plugin: Failed to execute ``%s'': %s",
383 pl->exec, sstrerror (errno, errbuf, sizeof (errbuf)));
384 exit (-1);
385 } /* void exec_child }}} */
387 static void reset_signal_mask (void) /* {{{ */
388 {
389 sigset_t ss;
391 memset (&ss, 0, sizeof (ss));
392 sigemptyset (&ss);
393 sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
394 } /* }}} void reset_signal_mask */
396 /*
397 * Creates three pipes (one for reading, one for writing and one for errors),
398 * forks a child, sets up the pipes so that fd_in is connected to STDIN of
399 * the child and fd_out is connected to STDOUT and fd_err is connected to STDERR
400 * of the child. Then is calls `exec_child'.
401 */
402 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
403 {
404 int fd_pipe_in[2];
405 int fd_pipe_out[2];
406 int fd_pipe_err[2];
407 char errbuf[1024];
408 int status;
409 int pid;
411 if (pl->pid != 0)
412 return (-1);
414 status = pipe (fd_pipe_in);
415 if (status != 0)
416 {
417 ERROR ("exec plugin: pipe failed: %s",
418 sstrerror (errno, errbuf, sizeof (errbuf)));
419 return (-1);
420 }
422 status = pipe (fd_pipe_out);
423 if (status != 0)
424 {
425 ERROR ("exec plugin: pipe failed: %s",
426 sstrerror (errno, errbuf, sizeof (errbuf)));
427 return (-1);
428 }
430 status = pipe (fd_pipe_err);
431 if (status != 0)
432 {
433 ERROR ("exec plugin: pipe failed: %s",
434 sstrerror (errno, errbuf, sizeof (errbuf)));
435 return (-1);
436 }
438 pid = fork ();
439 if (pid < 0)
440 {
441 ERROR ("exec plugin: fork failed: %s",
442 sstrerror (errno, errbuf, sizeof (errbuf)));
443 return (-1);
444 }
445 else if (pid == 0)
446 {
447 int fd_num;
448 int fd;
450 /* Close all file descriptors but the pipe end we need. */
451 fd_num = getdtablesize ();
452 for (fd = 0; fd < fd_num; fd++)
453 {
454 if ((fd == fd_pipe_in[0])
455 || (fd == fd_pipe_out[1])
456 || (fd == fd_pipe_err[1]))
457 continue;
458 close (fd);
459 }
461 /* Connect the `in' pipe to STDIN */
462 if (fd_pipe_in[0] != STDIN_FILENO)
463 {
464 dup2 (fd_pipe_in[0], STDIN_FILENO);
465 close (fd_pipe_in[0]);
466 }
468 /* Now connect the `out' pipe to STDOUT */
469 if (fd_pipe_out[1] != STDOUT_FILENO)
470 {
471 dup2 (fd_pipe_out[1], STDOUT_FILENO);
472 close (fd_pipe_out[1]);
473 }
475 /* Now connect the `out' pipe to STDOUT */
476 if (fd_pipe_err[1] != STDERR_FILENO)
477 {
478 dup2 (fd_pipe_err[1], STDERR_FILENO);
479 close (fd_pipe_err[1]);
480 }
482 /* Unblock all signals */
483 reset_signal_mask ();
485 exec_child (pl);
486 /* does not return */
487 }
489 close (fd_pipe_in[0]);
490 close (fd_pipe_out[1]);
491 close (fd_pipe_err[1]);
493 if (fd_in != NULL)
494 *fd_in = fd_pipe_in[1];
495 else
496 close (fd_pipe_in[1]);
498 if (fd_out != NULL)
499 *fd_out = fd_pipe_out[0];
500 else
501 close (fd_pipe_out[0]);
503 if (fd_err != NULL)
504 *fd_err = fd_pipe_err[0];
505 else
506 close (fd_pipe_err[0]);
508 return (pid);
509 } /* int fork_child }}} */
511 static int parse_line (char *buffer) /* {{{ */
512 {
513 if (strncasecmp ("PUTVAL", buffer, strlen ("PUTVAL")) == 0)
514 return (handle_putval (stdout, buffer));
515 else if (strncasecmp ("PUTNOTIF", buffer, strlen ("PUTNOTIF")) == 0)
516 return (handle_putnotif (stdout, buffer));
517 else
518 {
519 /* For backwards compatibility */
520 char tmp[1220];
521 /* Let's annoy the user a bit.. */
522 INFO ("exec plugin: Prepending `PUTVAL' to this line: %s", buffer);
523 ssnprintf (tmp, sizeof (tmp), "PUTVAL %s", buffer);
524 return (handle_putval (stdout, tmp));
525 }
526 } /* int parse_line }}} */
528 static void *exec_read_one (void *arg) /* {{{ */
529 {
530 program_list_t *pl = (program_list_t *) arg;
531 int fd, fd_err, highest_fd;
532 fd_set fdset, copy;
533 int status;
534 char buffer[1200]; /* if not completely read */
535 char buffer_err[1024];
536 char *pbuffer = buffer;
537 char *pbuffer_err = buffer_err;
539 status = fork_child (pl, NULL, &fd, &fd_err);
540 if (status < 0)
541 {
542 /* Reset the "running" flag */
543 pthread_mutex_lock (&pl_lock);
544 pl->flags &= ~PL_RUNNING;
545 pthread_mutex_unlock (&pl_lock);
546 pthread_exit ((void *) 1);
547 }
548 pl->pid = status;
550 assert (pl->pid != 0);
552 FD_ZERO( &fdset );
553 FD_SET(fd, &fdset);
554 FD_SET(fd_err, &fdset);
556 /* Determine the highest file descriptor */
557 highest_fd = (fd > fd_err) ? fd : fd_err;
559 /* We use a copy of fdset, as select modifies it */
560 copy = fdset;
562 while (select(highest_fd + 1, ©, NULL, NULL, NULL ) > 0)
563 {
564 int len;
566 if (FD_ISSET(fd, ©))
567 {
568 char *pnl;
570 len = read(fd, pbuffer, sizeof(buffer) - 1 - (pbuffer - buffer));
572 if (len < 0)
573 {
574 if (errno == EAGAIN || errno == EINTR) continue;
575 break;
576 }
577 else if (len == 0) break; /* We've reached EOF */
579 pbuffer[len] = '\0';
581 len += pbuffer - buffer;
582 pbuffer = buffer;
584 while ((pnl = strchr(pbuffer, '\n')))
585 {
586 *pnl = '\0';
587 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
589 parse_line (pbuffer);
591 pbuffer = ++pnl;
592 }
593 /* not completely read ? */
594 if (pbuffer - buffer < len)
595 {
596 len -= pbuffer - buffer;
597 memmove(buffer, pbuffer, len);
598 pbuffer = buffer + len;
599 }
600 else
601 pbuffer = buffer;
602 }
603 else if (FD_ISSET(fd_err, ©))
604 {
605 char *pnl;
607 len = read(fd_err, pbuffer_err, sizeof(buffer_err) - 1 - (pbuffer_err - buffer_err));
609 if (len < 0)
610 {
611 if (errno == EAGAIN || errno == EINTR) continue;
612 break;
613 }
614 else if (len == 0)
615 {
616 /* We've reached EOF */
617 NOTICE ("exec plugin: Program `%s' has closed STDERR.",
618 pl->exec);
619 close (fd_err);
620 FD_CLR (fd_err, &fdset);
621 highest_fd = fd;
622 fd_err = -1;
623 continue;
624 }
626 pbuffer_err[len] = '\0';
628 len += pbuffer_err - buffer_err;
629 pbuffer_err = buffer_err;
631 while ((pnl = strchr(pbuffer_err, '\n')))
632 {
633 *pnl = '\0';
634 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
636 ERROR ("exec plugin: exec_read_one: error = %s", pbuffer_err);
638 pbuffer_err = ++pnl;
639 }
640 /* not completely read ? */
641 if (pbuffer_err - buffer_err < len)
642 {
643 len -= pbuffer_err - buffer_err;
644 memmove(buffer_err, pbuffer_err, len);
645 pbuffer_err = buffer_err + len;
646 }
647 else
648 pbuffer_err = buffer_err;
649 }
650 /* reset copy */
651 copy = fdset;
652 }
654 DEBUG ("exec plugin: exec_read_one: Waiting for `%s' to exit.", pl->exec);
655 if (waitpid (pl->pid, &status, 0) > 0)
656 pl->status = status;
658 DEBUG ("exec plugin: Child %i exited with status %i.",
659 (int) pl->pid, pl->status);
661 pl->pid = 0;
663 pthread_mutex_lock (&pl_lock);
664 pl->flags &= ~PL_RUNNING;
665 pthread_mutex_unlock (&pl_lock);
667 close (fd);
668 if (fd_err >= 0)
669 close (fd_err);
671 pthread_exit ((void *) 0);
672 return (NULL);
673 } /* void *exec_read_one }}} */
675 static void *exec_notification_one (void *arg) /* {{{ */
676 {
677 program_list_t *pl = ((program_list_and_notification_t *) arg)->pl;
678 notification_t *n = &((program_list_and_notification_t *) arg)->n;
679 notification_meta_t *meta;
680 int fd;
681 FILE *fh;
682 int pid;
683 int status;
684 const char *severity;
686 pid = fork_child (pl, &fd, NULL, NULL);
687 if (pid < 0) {
688 sfree (arg);
689 pthread_exit ((void *) 1);
690 }
692 fh = fdopen (fd, "w");
693 if (fh == NULL)
694 {
695 char errbuf[1024];
696 ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
697 sstrerror (errno, errbuf, sizeof (errbuf)));
698 kill (pl->pid, SIGTERM);
699 pl->pid = 0;
700 close (fd);
701 sfree (arg);
702 pthread_exit ((void *) 1);
703 }
705 severity = "FAILURE";
706 if (n->severity == NOTIF_WARNING)
707 severity = "WARNING";
708 else if (n->severity == NOTIF_OKAY)
709 severity = "OKAY";
711 fprintf (fh,
712 "Severity: %s\n"
713 "Time: %u\n",
714 severity, (unsigned int) n->time);
716 /* Print the optional fields */
717 if (strlen (n->host) > 0)
718 fprintf (fh, "Host: %s\n", n->host);
719 if (strlen (n->plugin) > 0)
720 fprintf (fh, "Plugin: %s\n", n->plugin);
721 if (strlen (n->plugin_instance) > 0)
722 fprintf (fh, "PluginInstance: %s\n", n->plugin_instance);
723 if (strlen (n->type) > 0)
724 fprintf (fh, "Type: %s\n", n->type);
725 if (strlen (n->type_instance) > 0)
726 fprintf (fh, "TypeInstance: %s\n", n->type_instance);
728 for (meta = n->meta; meta != NULL; meta = meta->next)
729 {
730 if (meta->type == NM_TYPE_STRING)
731 fprintf (fh, "%s: %s\n", meta->name, meta->nm_value.nm_string);
732 else if (meta->type == NM_TYPE_SIGNED_INT)
733 fprintf (fh, "%s: %"PRIi64"\n", meta->name, meta->nm_value.nm_signed_int);
734 else if (meta->type == NM_TYPE_UNSIGNED_INT)
735 fprintf (fh, "%s: %"PRIu64"\n", meta->name, meta->nm_value.nm_unsigned_int);
736 else if (meta->type == NM_TYPE_DOUBLE)
737 fprintf (fh, "%s: %e\n", meta->name, meta->nm_value.nm_double);
738 else if (meta->type == NM_TYPE_BOOLEAN)
739 fprintf (fh, "%s: %s\n", meta->name,
740 meta->nm_value.nm_boolean ? "true" : "false");
741 }
743 fprintf (fh, "\n%s\n", n->message);
745 fflush (fh);
746 fclose (fh);
748 waitpid (pid, &status, 0);
750 DEBUG ("exec plugin: Child %i exited with status %i.",
751 pid, status);
753 if (n->meta != NULL)
754 plugin_notification_meta_free (n->meta);
755 n->meta = NULL;
756 sfree (arg);
757 pthread_exit ((void *) 0);
758 return (NULL);
759 } /* void *exec_notification_one }}} */
761 static int exec_init (void) /* {{{ */
762 {
763 struct sigaction sa;
765 memset (&sa, '\0', sizeof (sa));
766 sa.sa_handler = sigchld_handler;
767 sigaction (SIGCHLD, &sa, NULL);
769 return (0);
770 } /* int exec_init }}} */
772 static int exec_read (void) /* {{{ */
773 {
774 program_list_t *pl;
776 for (pl = pl_head; pl != NULL; pl = pl->next)
777 {
778 pthread_t t;
779 pthread_attr_t attr;
781 /* Only execute `normal' style executables here. */
782 if ((pl->flags & PL_NORMAL) == 0)
783 continue;
785 pthread_mutex_lock (&pl_lock);
786 /* Skip if a child is already running. */
787 if ((pl->flags & PL_RUNNING) != 0)
788 {
789 pthread_mutex_unlock (&pl_lock);
790 continue;
791 }
792 pl->flags |= PL_RUNNING;
793 pthread_mutex_unlock (&pl_lock);
795 pthread_attr_init (&attr);
796 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
797 pthread_create (&t, &attr, exec_read_one, (void *) pl);
798 } /* for (pl) */
800 return (0);
801 } /* int exec_read }}} */
803 static int exec_notification (const notification_t *n, /* {{{ */
804 user_data_t __attribute__((unused)) *user_data)
805 {
806 program_list_t *pl;
807 program_list_and_notification_t *pln;
809 for (pl = pl_head; pl != NULL; pl = pl->next)
810 {
811 pthread_t t;
812 pthread_attr_t attr;
814 /* Only execute `notification' style executables here. */
815 if ((pl->flags & PL_NOTIF_ACTION) == 0)
816 continue;
818 /* Skip if a child is already running. */
819 if (pl->pid != 0)
820 continue;
822 pln = (program_list_and_notification_t *) malloc (sizeof
823 (program_list_and_notification_t));
824 if (pln == NULL)
825 {
826 ERROR ("exec plugin: malloc failed.");
827 continue;
828 }
830 pln->pl = pl;
831 memcpy (&pln->n, n, sizeof (notification_t));
833 /* Set the `meta' member to NULL, otherwise `plugin_notification_meta_copy'
834 * will run into an endless loop. */
835 pln->n.meta = NULL;
836 plugin_notification_meta_copy (&pln->n, n);
838 pthread_attr_init (&attr);
839 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
840 pthread_create (&t, &attr, exec_notification_one, (void *) pln);
841 } /* for (pl) */
843 return (0);
844 } /* }}} int exec_notification */
846 static int exec_shutdown (void) /* {{{ */
847 {
848 program_list_t *pl;
849 program_list_t *next;
851 pl = pl_head;
852 while (pl != NULL)
853 {
854 next = pl->next;
856 if (pl->pid > 0)
857 {
858 kill (pl->pid, SIGTERM);
859 INFO ("exec plugin: Sent SIGTERM to %hu", (unsigned short int) pl->pid);
860 }
862 sfree (pl->user);
863 sfree (pl);
865 pl = next;
866 } /* while (pl) */
867 pl_head = NULL;
869 return (0);
870 } /* int exec_shutdown }}} */
872 void module_register (void)
873 {
874 plugin_register_complex_config ("exec", exec_config);
875 plugin_register_init ("exec", exec_init);
876 plugin_register_read ("exec", exec_read);
877 plugin_register_notification ("exec", exec_notification,
878 /* user_data = */ NULL);
879 plugin_register_shutdown ("exec", exec_shutdown);
880 } /* void module_register */
882 /*
883 * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
884 */