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 static void set_environment (void) /* {{{ */
269 {
270 char buffer[1024];
272 #ifdef HAVE_SETENV
273 ssnprintf (buffer, sizeof (buffer), "%.3f", CDTIME_T_TO_DOUBLE (interval_g));
274 setenv ("COLLECTD_INTERVAL", buffer, /* overwrite = */ 1);
276 ssnprintf (buffer, sizeof (buffer), "%s", hostname_g);
277 setenv ("COLLECTD_HOSTNAME", buffer, /* overwrite = */ 1);
278 #else
279 ssnprintf (buffer, sizeof (buffer), "COLLECTD_INTERVAL=%.3f",
280 CDTIME_T_TO_DOUBLE (interval_g));
281 putenv (buffer);
283 ssnprintf (buffer, sizeof (buffer), "COLLECTD_HOSTNAME=%s", hostname_g);
284 putenv (buffer);
285 #endif
286 } /* }}} void set_environment */
288 __attribute__((noreturn))
289 static void exec_child (program_list_t *pl) /* {{{ */
290 {
291 int status;
292 int uid;
293 int gid;
294 int egid;
296 struct passwd *sp_ptr;
297 struct passwd sp;
298 char nambuf[2048];
299 char errbuf[1024];
301 sp_ptr = NULL;
302 status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
303 if (status != 0)
304 {
305 ERROR ("exec plugin: Failed to get user information for user ``%s'': %s",
306 pl->user, sstrerror (errno, errbuf, sizeof (errbuf)));
307 exit (-1);
308 }
309 if (sp_ptr == NULL)
310 {
311 ERROR ("exec plugin: No such user: `%s'", pl->user);
312 exit (-1);
313 }
315 uid = sp.pw_uid;
316 gid = sp.pw_gid;
317 if (uid == 0)
318 {
319 ERROR ("exec plugin: Cowardly refusing to exec program as root.");
320 exit (-1);
321 }
323 /* The group configured in the configfile is set as effective group, because
324 * this way the forked process can (re-)gain the user's primary group. */
325 egid = -1;
326 if (NULL != pl->group)
327 {
328 if ('\0' != *pl->group) {
329 struct group *gr_ptr = NULL;
330 struct group gr;
332 status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
333 if (0 != status)
334 {
335 ERROR ("exec plugin: Failed to get group information "
336 "for group ``%s'': %s", pl->group,
337 sstrerror (errno, errbuf, sizeof (errbuf)));
338 exit (-1);
339 }
340 if (NULL == gr_ptr)
341 {
342 ERROR ("exec plugin: No such group: `%s'", pl->group);
343 exit (-1);
344 }
346 egid = gr.gr_gid;
347 }
348 else
349 {
350 egid = gid;
351 }
352 } /* if (pl->group == NULL) */
354 #if HAVE_SETGROUPS
355 if (getuid () == 0)
356 {
357 gid_t glist[2];
358 size_t glist_len;
360 glist[0] = gid;
361 glist_len = 1;
363 if ((gid != egid) && (egid != -1))
364 {
365 glist[1] = egid;
366 glist_len = 2;
367 }
369 setgroups (glist_len, glist);
370 }
371 #endif /* HAVE_SETGROUPS */
373 status = setgid (gid);
374 if (status != 0)
375 {
376 ERROR ("exec plugin: setgid (%i) failed: %s",
377 gid, sstrerror (errno, errbuf, sizeof (errbuf)));
378 exit (-1);
379 }
381 if (egid != -1)
382 {
383 status = setegid (egid);
384 if (status != 0)
385 {
386 ERROR ("exec plugin: setegid (%i) failed: %s",
387 egid, sstrerror (errno, errbuf, sizeof (errbuf)));
388 exit (-1);
389 }
390 }
392 status = setuid (uid);
393 if (status != 0)
394 {
395 ERROR ("exec plugin: setuid (%i) failed: %s",
396 uid, sstrerror (errno, errbuf, sizeof (errbuf)));
397 exit (-1);
398 }
400 status = execvp (pl->exec, pl->argv);
402 ERROR ("exec plugin: Failed to execute ``%s'': %s",
403 pl->exec, sstrerror (errno, errbuf, sizeof (errbuf)));
404 exit (-1);
405 } /* void exec_child }}} */
407 static void reset_signal_mask (void) /* {{{ */
408 {
409 sigset_t ss;
411 memset (&ss, 0, sizeof (ss));
412 sigemptyset (&ss);
413 sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
414 } /* }}} void reset_signal_mask */
416 /*
417 * Creates three pipes (one for reading, one for writing and one for errors),
418 * forks a child, sets up the pipes so that fd_in is connected to STDIN of
419 * the child and fd_out is connected to STDOUT and fd_err is connected to STDERR
420 * of the child. Then is calls `exec_child'.
421 */
422 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
423 {
424 int fd_pipe_in[2];
425 int fd_pipe_out[2];
426 int fd_pipe_err[2];
427 char errbuf[1024];
428 int status;
429 int pid;
431 if (pl->pid != 0)
432 return (-1);
434 status = pipe (fd_pipe_in);
435 if (status != 0)
436 {
437 ERROR ("exec plugin: pipe failed: %s",
438 sstrerror (errno, errbuf, sizeof (errbuf)));
439 return (-1);
440 }
442 status = pipe (fd_pipe_out);
443 if (status != 0)
444 {
445 ERROR ("exec plugin: pipe failed: %s",
446 sstrerror (errno, errbuf, sizeof (errbuf)));
447 return (-1);
448 }
450 status = pipe (fd_pipe_err);
451 if (status != 0)
452 {
453 ERROR ("exec plugin: pipe failed: %s",
454 sstrerror (errno, errbuf, sizeof (errbuf)));
455 return (-1);
456 }
458 pid = fork ();
459 if (pid < 0)
460 {
461 ERROR ("exec plugin: fork failed: %s",
462 sstrerror (errno, errbuf, sizeof (errbuf)));
463 return (-1);
464 }
465 else if (pid == 0)
466 {
467 int fd_num;
468 int fd;
470 /* Close all file descriptors but the pipe end we need. */
471 fd_num = getdtablesize ();
472 for (fd = 0; fd < fd_num; fd++)
473 {
474 if ((fd == fd_pipe_in[0])
475 || (fd == fd_pipe_out[1])
476 || (fd == fd_pipe_err[1]))
477 continue;
478 close (fd);
479 }
481 /* Connect the `in' pipe to STDIN */
482 if (fd_pipe_in[0] != STDIN_FILENO)
483 {
484 dup2 (fd_pipe_in[0], STDIN_FILENO);
485 close (fd_pipe_in[0]);
486 }
488 /* Now connect the `out' pipe to STDOUT */
489 if (fd_pipe_out[1] != STDOUT_FILENO)
490 {
491 dup2 (fd_pipe_out[1], STDOUT_FILENO);
492 close (fd_pipe_out[1]);
493 }
495 /* Now connect the `out' pipe to STDOUT */
496 if (fd_pipe_err[1] != STDERR_FILENO)
497 {
498 dup2 (fd_pipe_err[1], STDERR_FILENO);
499 close (fd_pipe_err[1]);
500 }
502 set_environment ();
504 /* Unblock all signals */
505 reset_signal_mask ();
507 exec_child (pl);
508 /* does not return */
509 }
511 close (fd_pipe_in[0]);
512 close (fd_pipe_out[1]);
513 close (fd_pipe_err[1]);
515 if (fd_in != NULL)
516 *fd_in = fd_pipe_in[1];
517 else
518 close (fd_pipe_in[1]);
520 if (fd_out != NULL)
521 *fd_out = fd_pipe_out[0];
522 else
523 close (fd_pipe_out[0]);
525 if (fd_err != NULL)
526 *fd_err = fd_pipe_err[0];
527 else
528 close (fd_pipe_err[0]);
530 return (pid);
531 } /* int fork_child }}} */
533 static int parse_line (char *buffer) /* {{{ */
534 {
535 if (strncasecmp ("PUTVAL", buffer, strlen ("PUTVAL")) == 0)
536 return (handle_putval (stdout, buffer));
537 else if (strncasecmp ("PUTNOTIF", buffer, strlen ("PUTNOTIF")) == 0)
538 return (handle_putnotif (stdout, buffer));
539 else
540 {
541 ERROR ("exec plugin: Unable to parse command, ignoring line: \"%s\"",
542 buffer);
543 return (-1);
544 }
545 } /* int parse_line }}} */
547 static void *exec_read_one (void *arg) /* {{{ */
548 {
549 program_list_t *pl = (program_list_t *) arg;
550 int fd, fd_err, highest_fd;
551 fd_set fdset, copy;
552 int status;
553 char buffer[1200]; /* if not completely read */
554 char buffer_err[1024];
555 char *pbuffer = buffer;
556 char *pbuffer_err = buffer_err;
558 status = fork_child (pl, NULL, &fd, &fd_err);
559 if (status < 0)
560 {
561 /* Reset the "running" flag */
562 pthread_mutex_lock (&pl_lock);
563 pl->flags &= ~PL_RUNNING;
564 pthread_mutex_unlock (&pl_lock);
565 pthread_exit ((void *) 1);
566 }
567 pl->pid = status;
569 assert (pl->pid != 0);
571 FD_ZERO( &fdset );
572 FD_SET(fd, &fdset);
573 FD_SET(fd_err, &fdset);
575 /* Determine the highest file descriptor */
576 highest_fd = (fd > fd_err) ? fd : fd_err;
578 /* We use a copy of fdset, as select modifies it */
579 copy = fdset;
581 while (select(highest_fd + 1, ©, NULL, NULL, NULL ) > 0)
582 {
583 int len;
585 if (FD_ISSET(fd, ©))
586 {
587 char *pnl;
589 len = read(fd, pbuffer, sizeof(buffer) - 1 - (pbuffer - buffer));
591 if (len < 0)
592 {
593 if (errno == EAGAIN || errno == EINTR) continue;
594 break;
595 }
596 else if (len == 0) break; /* We've reached EOF */
598 pbuffer[len] = '\0';
600 len += pbuffer - buffer;
601 pbuffer = buffer;
603 while ((pnl = strchr(pbuffer, '\n')))
604 {
605 *pnl = '\0';
606 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
608 parse_line (pbuffer);
610 pbuffer = ++pnl;
611 }
612 /* not completely read ? */
613 if (pbuffer - buffer < len)
614 {
615 len -= pbuffer - buffer;
616 memmove(buffer, pbuffer, len);
617 pbuffer = buffer + len;
618 }
619 else
620 pbuffer = buffer;
621 }
622 else if (FD_ISSET(fd_err, ©))
623 {
624 char *pnl;
626 len = read(fd_err, pbuffer_err, sizeof(buffer_err) - 1 - (pbuffer_err - buffer_err));
628 if (len < 0)
629 {
630 if (errno == EAGAIN || errno == EINTR) continue;
631 break;
632 }
633 else if (len == 0)
634 {
635 /* We've reached EOF */
636 NOTICE ("exec plugin: Program `%s' has closed STDERR.",
637 pl->exec);
638 close (fd_err);
639 FD_CLR (fd_err, &fdset);
640 highest_fd = fd;
641 fd_err = -1;
642 continue;
643 }
645 pbuffer_err[len] = '\0';
647 len += pbuffer_err - buffer_err;
648 pbuffer_err = buffer_err;
650 while ((pnl = strchr(pbuffer_err, '\n')))
651 {
652 *pnl = '\0';
653 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
655 ERROR ("exec plugin: exec_read_one: error = %s", pbuffer_err);
657 pbuffer_err = ++pnl;
658 }
659 /* not completely read ? */
660 if (pbuffer_err - buffer_err < len)
661 {
662 len -= pbuffer_err - buffer_err;
663 memmove(buffer_err, pbuffer_err, len);
664 pbuffer_err = buffer_err + len;
665 }
666 else
667 pbuffer_err = buffer_err;
668 }
669 /* reset copy */
670 copy = fdset;
671 }
673 DEBUG ("exec plugin: exec_read_one: Waiting for `%s' to exit.", pl->exec);
674 if (waitpid (pl->pid, &status, 0) > 0)
675 pl->status = status;
677 DEBUG ("exec plugin: Child %i exited with status %i.",
678 (int) pl->pid, pl->status);
680 pl->pid = 0;
682 pthread_mutex_lock (&pl_lock);
683 pl->flags &= ~PL_RUNNING;
684 pthread_mutex_unlock (&pl_lock);
686 close (fd);
687 if (fd_err >= 0)
688 close (fd_err);
690 pthread_exit ((void *) 0);
691 return (NULL);
692 } /* void *exec_read_one }}} */
694 static void *exec_notification_one (void *arg) /* {{{ */
695 {
696 program_list_t *pl = ((program_list_and_notification_t *) arg)->pl;
697 notification_t *n = &((program_list_and_notification_t *) arg)->n;
698 notification_meta_t *meta;
699 int fd;
700 FILE *fh;
701 int pid;
702 int status;
703 const char *severity;
705 pid = fork_child (pl, &fd, NULL, NULL);
706 if (pid < 0) {
707 sfree (arg);
708 pthread_exit ((void *) 1);
709 }
711 fh = fdopen (fd, "w");
712 if (fh == NULL)
713 {
714 char errbuf[1024];
715 ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
716 sstrerror (errno, errbuf, sizeof (errbuf)));
717 kill (pl->pid, SIGTERM);
718 pl->pid = 0;
719 close (fd);
720 sfree (arg);
721 pthread_exit ((void *) 1);
722 }
724 severity = "FAILURE";
725 if (n->severity == NOTIF_WARNING)
726 severity = "WARNING";
727 else if (n->severity == NOTIF_OKAY)
728 severity = "OKAY";
730 fprintf (fh,
731 "Severity: %s\n"
732 "Time: %u\n",
733 severity, (unsigned int) n->time);
735 /* Print the optional fields */
736 if (strlen (n->host) > 0)
737 fprintf (fh, "Host: %s\n", n->host);
738 if (strlen (n->plugin) > 0)
739 fprintf (fh, "Plugin: %s\n", n->plugin);
740 if (strlen (n->plugin_instance) > 0)
741 fprintf (fh, "PluginInstance: %s\n", n->plugin_instance);
742 if (strlen (n->type) > 0)
743 fprintf (fh, "Type: %s\n", n->type);
744 if (strlen (n->type_instance) > 0)
745 fprintf (fh, "TypeInstance: %s\n", n->type_instance);
747 for (meta = n->meta; meta != NULL; meta = meta->next)
748 {
749 if (meta->type == NM_TYPE_STRING)
750 fprintf (fh, "%s: %s\n", meta->name, meta->nm_value.nm_string);
751 else if (meta->type == NM_TYPE_SIGNED_INT)
752 fprintf (fh, "%s: %"PRIi64"\n", meta->name, meta->nm_value.nm_signed_int);
753 else if (meta->type == NM_TYPE_UNSIGNED_INT)
754 fprintf (fh, "%s: %"PRIu64"\n", meta->name, meta->nm_value.nm_unsigned_int);
755 else if (meta->type == NM_TYPE_DOUBLE)
756 fprintf (fh, "%s: %e\n", meta->name, meta->nm_value.nm_double);
757 else if (meta->type == NM_TYPE_BOOLEAN)
758 fprintf (fh, "%s: %s\n", meta->name,
759 meta->nm_value.nm_boolean ? "true" : "false");
760 }
762 fprintf (fh, "\n%s\n", n->message);
764 fflush (fh);
765 fclose (fh);
767 waitpid (pid, &status, 0);
769 DEBUG ("exec plugin: Child %i exited with status %i.",
770 pid, status);
772 if (n->meta != NULL)
773 plugin_notification_meta_free (n->meta);
774 n->meta = NULL;
775 sfree (arg);
776 pthread_exit ((void *) 0);
777 return (NULL);
778 } /* void *exec_notification_one }}} */
780 static int exec_init (void) /* {{{ */
781 {
782 struct sigaction sa;
784 memset (&sa, '\0', sizeof (sa));
785 sa.sa_handler = sigchld_handler;
786 sigaction (SIGCHLD, &sa, NULL);
788 return (0);
789 } /* int exec_init }}} */
791 static int exec_read (void) /* {{{ */
792 {
793 program_list_t *pl;
795 for (pl = pl_head; pl != NULL; pl = pl->next)
796 {
797 pthread_t t;
798 pthread_attr_t attr;
800 /* Only execute `normal' style executables here. */
801 if ((pl->flags & PL_NORMAL) == 0)
802 continue;
804 pthread_mutex_lock (&pl_lock);
805 /* Skip if a child is already running. */
806 if ((pl->flags & PL_RUNNING) != 0)
807 {
808 pthread_mutex_unlock (&pl_lock);
809 continue;
810 }
811 pl->flags |= PL_RUNNING;
812 pthread_mutex_unlock (&pl_lock);
814 pthread_attr_init (&attr);
815 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
816 pthread_create (&t, &attr, exec_read_one, (void *) pl);
817 } /* for (pl) */
819 return (0);
820 } /* int exec_read }}} */
822 static int exec_notification (const notification_t *n, /* {{{ */
823 user_data_t __attribute__((unused)) *user_data)
824 {
825 program_list_t *pl;
826 program_list_and_notification_t *pln;
828 for (pl = pl_head; pl != NULL; pl = pl->next)
829 {
830 pthread_t t;
831 pthread_attr_t attr;
833 /* Only execute `notification' style executables here. */
834 if ((pl->flags & PL_NOTIF_ACTION) == 0)
835 continue;
837 /* Skip if a child is already running. */
838 if (pl->pid != 0)
839 continue;
841 pln = (program_list_and_notification_t *) malloc (sizeof
842 (program_list_and_notification_t));
843 if (pln == NULL)
844 {
845 ERROR ("exec plugin: malloc failed.");
846 continue;
847 }
849 pln->pl = pl;
850 memcpy (&pln->n, n, sizeof (notification_t));
852 /* Set the `meta' member to NULL, otherwise `plugin_notification_meta_copy'
853 * will run into an endless loop. */
854 pln->n.meta = NULL;
855 plugin_notification_meta_copy (&pln->n, n);
857 pthread_attr_init (&attr);
858 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
859 pthread_create (&t, &attr, exec_notification_one, (void *) pln);
860 } /* for (pl) */
862 return (0);
863 } /* }}} int exec_notification */
865 static int exec_shutdown (void) /* {{{ */
866 {
867 program_list_t *pl;
868 program_list_t *next;
870 pl = pl_head;
871 while (pl != NULL)
872 {
873 next = pl->next;
875 if (pl->pid > 0)
876 {
877 kill (pl->pid, SIGTERM);
878 INFO ("exec plugin: Sent SIGTERM to %hu", (unsigned short int) pl->pid);
879 }
881 sfree (pl->user);
882 sfree (pl);
884 pl = next;
885 } /* while (pl) */
886 pl_head = NULL;
888 return (0);
889 } /* int exec_shutdown }}} */
891 void module_register (void)
892 {
893 plugin_register_complex_config ("exec", exec_config);
894 plugin_register_init ("exec", exec_init);
895 plugin_register_read ("exec", exec_read);
896 plugin_register_notification ("exec", exec_notification,
897 /* user_data = */ NULL);
898 plugin_register_shutdown ("exec", exec_shutdown);
899 } /* void module_register */
901 /*
902 * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
903 */