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
287 #ifdef HAVE_SETENV
288 #else
289 #endif
290 } /* }}} void set_environment */
292 __attribute__((noreturn))
293 static void exec_child (program_list_t *pl) /* {{{ */
294 {
295 int status;
296 int uid;
297 int gid;
298 int egid;
300 struct passwd *sp_ptr;
301 struct passwd sp;
302 char nambuf[2048];
303 char errbuf[1024];
305 sp_ptr = NULL;
306 status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
307 if (status != 0)
308 {
309 ERROR ("exec plugin: Failed to get user information for user ``%s'': %s",
310 pl->user, sstrerror (errno, errbuf, sizeof (errbuf)));
311 exit (-1);
312 }
313 if (sp_ptr == NULL)
314 {
315 ERROR ("exec plugin: No such user: `%s'", pl->user);
316 exit (-1);
317 }
319 uid = sp.pw_uid;
320 gid = sp.pw_gid;
321 if (uid == 0)
322 {
323 ERROR ("exec plugin: Cowardly refusing to exec program as root.");
324 exit (-1);
325 }
327 /* The group configured in the configfile is set as effective group, because
328 * this way the forked process can (re-)gain the user's primary group. */
329 egid = -1;
330 if (NULL != pl->group)
331 {
332 if ('\0' != *pl->group) {
333 struct group *gr_ptr = NULL;
334 struct group gr;
336 status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
337 if (0 != status)
338 {
339 ERROR ("exec plugin: Failed to get group information "
340 "for group ``%s'': %s", pl->group,
341 sstrerror (errno, errbuf, sizeof (errbuf)));
342 exit (-1);
343 }
344 if (NULL == gr_ptr)
345 {
346 ERROR ("exec plugin: No such group: `%s'", pl->group);
347 exit (-1);
348 }
350 egid = gr.gr_gid;
351 }
352 else
353 {
354 egid = gid;
355 }
356 } /* if (pl->group == NULL) */
358 #if HAVE_SETGROUPS
359 if (getuid () == 0)
360 {
361 gid_t glist[2];
362 size_t glist_len;
364 glist[0] = gid;
365 glist_len = 1;
367 if ((gid != egid) && (egid != -1))
368 {
369 glist[1] = egid;
370 glist_len = 2;
371 }
373 setgroups (glist_len, glist);
374 }
375 #endif /* HAVE_SETGROUPS */
377 status = setgid (gid);
378 if (status != 0)
379 {
380 ERROR ("exec plugin: setgid (%i) failed: %s",
381 gid, sstrerror (errno, errbuf, sizeof (errbuf)));
382 exit (-1);
383 }
385 if (egid != -1)
386 {
387 status = setegid (egid);
388 if (status != 0)
389 {
390 ERROR ("exec plugin: setegid (%i) failed: %s",
391 egid, sstrerror (errno, errbuf, sizeof (errbuf)));
392 exit (-1);
393 }
394 }
396 status = setuid (uid);
397 if (status != 0)
398 {
399 ERROR ("exec plugin: setuid (%i) failed: %s",
400 uid, sstrerror (errno, errbuf, sizeof (errbuf)));
401 exit (-1);
402 }
404 status = execvp (pl->exec, pl->argv);
406 ERROR ("exec plugin: Failed to execute ``%s'': %s",
407 pl->exec, sstrerror (errno, errbuf, sizeof (errbuf)));
408 exit (-1);
409 } /* void exec_child }}} */
411 static void reset_signal_mask (void) /* {{{ */
412 {
413 sigset_t ss;
415 memset (&ss, 0, sizeof (ss));
416 sigemptyset (&ss);
417 sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
418 } /* }}} void reset_signal_mask */
420 /*
421 * Creates three pipes (one for reading, one for writing and one for errors),
422 * forks a child, sets up the pipes so that fd_in is connected to STDIN of
423 * the child and fd_out is connected to STDOUT and fd_err is connected to STDERR
424 * of the child. Then is calls `exec_child'.
425 */
426 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
427 {
428 int fd_pipe_in[2];
429 int fd_pipe_out[2];
430 int fd_pipe_err[2];
431 char errbuf[1024];
432 int status;
433 int pid;
435 if (pl->pid != 0)
436 return (-1);
438 status = pipe (fd_pipe_in);
439 if (status != 0)
440 {
441 ERROR ("exec plugin: pipe failed: %s",
442 sstrerror (errno, errbuf, sizeof (errbuf)));
443 return (-1);
444 }
446 status = pipe (fd_pipe_out);
447 if (status != 0)
448 {
449 ERROR ("exec plugin: pipe failed: %s",
450 sstrerror (errno, errbuf, sizeof (errbuf)));
451 return (-1);
452 }
454 status = pipe (fd_pipe_err);
455 if (status != 0)
456 {
457 ERROR ("exec plugin: pipe failed: %s",
458 sstrerror (errno, errbuf, sizeof (errbuf)));
459 return (-1);
460 }
462 pid = fork ();
463 if (pid < 0)
464 {
465 ERROR ("exec plugin: fork failed: %s",
466 sstrerror (errno, errbuf, sizeof (errbuf)));
467 return (-1);
468 }
469 else if (pid == 0)
470 {
471 int fd_num;
472 int fd;
474 /* Close all file descriptors but the pipe end we need. */
475 fd_num = getdtablesize ();
476 for (fd = 0; fd < fd_num; fd++)
477 {
478 if ((fd == fd_pipe_in[0])
479 || (fd == fd_pipe_out[1])
480 || (fd == fd_pipe_err[1]))
481 continue;
482 close (fd);
483 }
485 /* Connect the `in' pipe to STDIN */
486 if (fd_pipe_in[0] != STDIN_FILENO)
487 {
488 dup2 (fd_pipe_in[0], STDIN_FILENO);
489 close (fd_pipe_in[0]);
490 }
492 /* Now connect the `out' pipe to STDOUT */
493 if (fd_pipe_out[1] != STDOUT_FILENO)
494 {
495 dup2 (fd_pipe_out[1], STDOUT_FILENO);
496 close (fd_pipe_out[1]);
497 }
499 /* Now connect the `out' pipe to STDOUT */
500 if (fd_pipe_err[1] != STDERR_FILENO)
501 {
502 dup2 (fd_pipe_err[1], STDERR_FILENO);
503 close (fd_pipe_err[1]);
504 }
506 set_environment ();
508 /* Unblock all signals */
509 reset_signal_mask ();
511 exec_child (pl);
512 /* does not return */
513 }
515 close (fd_pipe_in[0]);
516 close (fd_pipe_out[1]);
517 close (fd_pipe_err[1]);
519 if (fd_in != NULL)
520 *fd_in = fd_pipe_in[1];
521 else
522 close (fd_pipe_in[1]);
524 if (fd_out != NULL)
525 *fd_out = fd_pipe_out[0];
526 else
527 close (fd_pipe_out[0]);
529 if (fd_err != NULL)
530 *fd_err = fd_pipe_err[0];
531 else
532 close (fd_pipe_err[0]);
534 return (pid);
535 } /* int fork_child }}} */
537 static int parse_line (char *buffer) /* {{{ */
538 {
539 if (strncasecmp ("PUTVAL", buffer, strlen ("PUTVAL")) == 0)
540 return (handle_putval (stdout, buffer));
541 else if (strncasecmp ("PUTNOTIF", buffer, strlen ("PUTNOTIF")) == 0)
542 return (handle_putnotif (stdout, buffer));
543 else
544 {
545 ERROR ("exec plugin: Unable to parse command, ignoring line: \"%s\"",
546 buffer);
547 return (-1);
548 }
549 } /* int parse_line }}} */
551 static void *exec_read_one (void *arg) /* {{{ */
552 {
553 program_list_t *pl = (program_list_t *) arg;
554 int fd, fd_err, highest_fd;
555 fd_set fdset, copy;
556 int status;
557 char buffer[1200]; /* if not completely read */
558 char buffer_err[1024];
559 char *pbuffer = buffer;
560 char *pbuffer_err = buffer_err;
562 status = fork_child (pl, NULL, &fd, &fd_err);
563 if (status < 0)
564 {
565 /* Reset the "running" flag */
566 pthread_mutex_lock (&pl_lock);
567 pl->flags &= ~PL_RUNNING;
568 pthread_mutex_unlock (&pl_lock);
569 pthread_exit ((void *) 1);
570 }
571 pl->pid = status;
573 assert (pl->pid != 0);
575 FD_ZERO( &fdset );
576 FD_SET(fd, &fdset);
577 FD_SET(fd_err, &fdset);
579 /* Determine the highest file descriptor */
580 highest_fd = (fd > fd_err) ? fd : fd_err;
582 /* We use a copy of fdset, as select modifies it */
583 copy = fdset;
585 while (select(highest_fd + 1, ©, NULL, NULL, NULL ) > 0)
586 {
587 int len;
589 if (FD_ISSET(fd, ©))
590 {
591 char *pnl;
593 len = read(fd, pbuffer, sizeof(buffer) - 1 - (pbuffer - buffer));
595 if (len < 0)
596 {
597 if (errno == EAGAIN || errno == EINTR) continue;
598 break;
599 }
600 else if (len == 0) break; /* We've reached EOF */
602 pbuffer[len] = '\0';
604 len += pbuffer - buffer;
605 pbuffer = buffer;
607 while ((pnl = strchr(pbuffer, '\n')))
608 {
609 *pnl = '\0';
610 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
612 parse_line (pbuffer);
614 pbuffer = ++pnl;
615 }
616 /* not completely read ? */
617 if (pbuffer - buffer < len)
618 {
619 len -= pbuffer - buffer;
620 memmove(buffer, pbuffer, len);
621 pbuffer = buffer + len;
622 }
623 else
624 pbuffer = buffer;
625 }
626 else if (FD_ISSET(fd_err, ©))
627 {
628 char *pnl;
630 len = read(fd_err, pbuffer_err, sizeof(buffer_err) - 1 - (pbuffer_err - buffer_err));
632 if (len < 0)
633 {
634 if (errno == EAGAIN || errno == EINTR) continue;
635 break;
636 }
637 else if (len == 0)
638 {
639 /* We've reached EOF */
640 NOTICE ("exec plugin: Program `%s' has closed STDERR.",
641 pl->exec);
642 close (fd_err);
643 FD_CLR (fd_err, &fdset);
644 highest_fd = fd;
645 fd_err = -1;
646 continue;
647 }
649 pbuffer_err[len] = '\0';
651 len += pbuffer_err - buffer_err;
652 pbuffer_err = buffer_err;
654 while ((pnl = strchr(pbuffer_err, '\n')))
655 {
656 *pnl = '\0';
657 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
659 ERROR ("exec plugin: exec_read_one: error = %s", pbuffer_err);
661 pbuffer_err = ++pnl;
662 }
663 /* not completely read ? */
664 if (pbuffer_err - buffer_err < len)
665 {
666 len -= pbuffer_err - buffer_err;
667 memmove(buffer_err, pbuffer_err, len);
668 pbuffer_err = buffer_err + len;
669 }
670 else
671 pbuffer_err = buffer_err;
672 }
673 /* reset copy */
674 copy = fdset;
675 }
677 DEBUG ("exec plugin: exec_read_one: Waiting for `%s' to exit.", pl->exec);
678 if (waitpid (pl->pid, &status, 0) > 0)
679 pl->status = status;
681 DEBUG ("exec plugin: Child %i exited with status %i.",
682 (int) pl->pid, pl->status);
684 pl->pid = 0;
686 pthread_mutex_lock (&pl_lock);
687 pl->flags &= ~PL_RUNNING;
688 pthread_mutex_unlock (&pl_lock);
690 close (fd);
691 if (fd_err >= 0)
692 close (fd_err);
694 pthread_exit ((void *) 0);
695 return (NULL);
696 } /* void *exec_read_one }}} */
698 static void *exec_notification_one (void *arg) /* {{{ */
699 {
700 program_list_t *pl = ((program_list_and_notification_t *) arg)->pl;
701 notification_t *n = &((program_list_and_notification_t *) arg)->n;
702 notification_meta_t *meta;
703 int fd;
704 FILE *fh;
705 int pid;
706 int status;
707 const char *severity;
709 pid = fork_child (pl, &fd, NULL, NULL);
710 if (pid < 0) {
711 sfree (arg);
712 pthread_exit ((void *) 1);
713 }
715 fh = fdopen (fd, "w");
716 if (fh == NULL)
717 {
718 char errbuf[1024];
719 ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
720 sstrerror (errno, errbuf, sizeof (errbuf)));
721 kill (pl->pid, SIGTERM);
722 pl->pid = 0;
723 close (fd);
724 sfree (arg);
725 pthread_exit ((void *) 1);
726 }
728 severity = "FAILURE";
729 if (n->severity == NOTIF_WARNING)
730 severity = "WARNING";
731 else if (n->severity == NOTIF_OKAY)
732 severity = "OKAY";
734 fprintf (fh,
735 "Severity: %s\n"
736 "Time: %u\n",
737 severity, (unsigned int) n->time);
739 /* Print the optional fields */
740 if (strlen (n->host) > 0)
741 fprintf (fh, "Host: %s\n", n->host);
742 if (strlen (n->plugin) > 0)
743 fprintf (fh, "Plugin: %s\n", n->plugin);
744 if (strlen (n->plugin_instance) > 0)
745 fprintf (fh, "PluginInstance: %s\n", n->plugin_instance);
746 if (strlen (n->type) > 0)
747 fprintf (fh, "Type: %s\n", n->type);
748 if (strlen (n->type_instance) > 0)
749 fprintf (fh, "TypeInstance: %s\n", n->type_instance);
751 for (meta = n->meta; meta != NULL; meta = meta->next)
752 {
753 if (meta->type == NM_TYPE_STRING)
754 fprintf (fh, "%s: %s\n", meta->name, meta->nm_value.nm_string);
755 else if (meta->type == NM_TYPE_SIGNED_INT)
756 fprintf (fh, "%s: %"PRIi64"\n", meta->name, meta->nm_value.nm_signed_int);
757 else if (meta->type == NM_TYPE_UNSIGNED_INT)
758 fprintf (fh, "%s: %"PRIu64"\n", meta->name, meta->nm_value.nm_unsigned_int);
759 else if (meta->type == NM_TYPE_DOUBLE)
760 fprintf (fh, "%s: %e\n", meta->name, meta->nm_value.nm_double);
761 else if (meta->type == NM_TYPE_BOOLEAN)
762 fprintf (fh, "%s: %s\n", meta->name,
763 meta->nm_value.nm_boolean ? "true" : "false");
764 }
766 fprintf (fh, "\n%s\n", n->message);
768 fflush (fh);
769 fclose (fh);
771 waitpid (pid, &status, 0);
773 DEBUG ("exec plugin: Child %i exited with status %i.",
774 pid, status);
776 if (n->meta != NULL)
777 plugin_notification_meta_free (n->meta);
778 n->meta = NULL;
779 sfree (arg);
780 pthread_exit ((void *) 0);
781 return (NULL);
782 } /* void *exec_notification_one }}} */
784 static int exec_init (void) /* {{{ */
785 {
786 struct sigaction sa;
788 memset (&sa, '\0', sizeof (sa));
789 sa.sa_handler = sigchld_handler;
790 sigaction (SIGCHLD, &sa, NULL);
792 return (0);
793 } /* int exec_init }}} */
795 static int exec_read (void) /* {{{ */
796 {
797 program_list_t *pl;
799 for (pl = pl_head; pl != NULL; pl = pl->next)
800 {
801 pthread_t t;
802 pthread_attr_t attr;
804 /* Only execute `normal' style executables here. */
805 if ((pl->flags & PL_NORMAL) == 0)
806 continue;
808 pthread_mutex_lock (&pl_lock);
809 /* Skip if a child is already running. */
810 if ((pl->flags & PL_RUNNING) != 0)
811 {
812 pthread_mutex_unlock (&pl_lock);
813 continue;
814 }
815 pl->flags |= PL_RUNNING;
816 pthread_mutex_unlock (&pl_lock);
818 pthread_attr_init (&attr);
819 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
820 pthread_create (&t, &attr, exec_read_one, (void *) pl);
821 } /* for (pl) */
823 return (0);
824 } /* int exec_read }}} */
826 static int exec_notification (const notification_t *n, /* {{{ */
827 user_data_t __attribute__((unused)) *user_data)
828 {
829 program_list_t *pl;
830 program_list_and_notification_t *pln;
832 for (pl = pl_head; pl != NULL; pl = pl->next)
833 {
834 pthread_t t;
835 pthread_attr_t attr;
837 /* Only execute `notification' style executables here. */
838 if ((pl->flags & PL_NOTIF_ACTION) == 0)
839 continue;
841 /* Skip if a child is already running. */
842 if (pl->pid != 0)
843 continue;
845 pln = (program_list_and_notification_t *) malloc (sizeof
846 (program_list_and_notification_t));
847 if (pln == NULL)
848 {
849 ERROR ("exec plugin: malloc failed.");
850 continue;
851 }
853 pln->pl = pl;
854 memcpy (&pln->n, n, sizeof (notification_t));
856 /* Set the `meta' member to NULL, otherwise `plugin_notification_meta_copy'
857 * will run into an endless loop. */
858 pln->n.meta = NULL;
859 plugin_notification_meta_copy (&pln->n, n);
861 pthread_attr_init (&attr);
862 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
863 pthread_create (&t, &attr, exec_notification_one, (void *) pln);
864 } /* for (pl) */
866 return (0);
867 } /* }}} int exec_notification */
869 static int exec_shutdown (void) /* {{{ */
870 {
871 program_list_t *pl;
872 program_list_t *next;
874 pl = pl_head;
875 while (pl != NULL)
876 {
877 next = pl->next;
879 if (pl->pid > 0)
880 {
881 kill (pl->pid, SIGTERM);
882 INFO ("exec plugin: Sent SIGTERM to %hu", (unsigned short int) pl->pid);
883 }
885 sfree (pl->user);
886 sfree (pl);
888 pl = next;
889 } /* while (pl) */
890 pl_head = NULL;
892 return (0);
893 } /* int exec_shutdown }}} */
895 void module_register (void)
896 {
897 plugin_register_complex_config ("exec", exec_config);
898 plugin_register_init ("exec", exec_init);
899 plugin_register_read ("exec", exec_read);
900 plugin_register_notification ("exec", exec_notification,
901 /* user_data = */ NULL);
902 plugin_register_shutdown ("exec", exec_shutdown);
903 } /* void module_register */
905 /*
906 * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
907 */