1 files changed, 24 insertions, 16 deletions

diff --git a/lib/utils_cmd.c b/lib/utils_cmd.c
index 34fb390..7957ec1 100644
--- a/lib/utils_cmd.c
+++ b/lib/utils_cmd.c
@@ -18,18 +18,18 @@
 * Care has been taken to make sure the functions are async-safe. The one
 * function which isn't is cmd_init() which it doesn't make sense to
 * call twice anyway, so the api as a whole should be considered async-safe.
-* 
-* 
+*
+*
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
-* 
+*
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
-* 
+*
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
@@ -42,7 +42,20 @@
 #include "common.h"
 #include "utils.h"
 #include "utils_cmd.h"
+/* This variable must be global, since there's no way the caller
+ * can forcibly slay a dead or ungainly running program otherwise.
+ * Multithreading apps and plugins can initialize it (via CMD_INIT)
+ * in an async safe manner PRIOR to calling cmd_run() or cmd_run_array()
+ * for the first time.
+ *
+ * The check for initialized values is atomic and can
+ * occur in any number of threads simultaneously. */
+static pid_t *_cmd_pids = NULL;
+
 #include "utils_base.h"
+
+#include "./maxfd.h"
+
 #include <fcntl.h>
 
 #ifdef HAVE_SYS_WAIT_H
@@ -86,13 +99,7 @@ extern void die (int, const char *, ...)
 void
 cmd_init (void)
 {
-#ifndef maxfd
-        if (!maxfd && (maxfd = sysconf (_SC_OPEN_MAX)) < 0) {
-                /* possibly log or emit a warning here, since there's no
-                 * guarantee that our guess at maxfd will be adequate */
-                maxfd = DEFAULT_MAXFD;
-        }
-#endif
+        long maxfd = mp_open_max();
 
         /* if maxfd is unnaturally high, we force it to a lower value
          * ( e.g. on SunOS, when ulimit is set to unlimited: 2147483647 this would cause
@@ -148,6 +155,7 @@ _cmd_open (char *const *argv, int *pfd, int *pfderr)
                 /* close all descriptors in _cmd_pids[]
                  * This is executed in a separate address space (pure child),
                  * so we don't have to worry about async safety */
+                long maxfd = mp_open_max();
                 for (i = 0; i < maxfd; i++)
                         if (_cmd_pids[i] > 0)
                                 close (i);
@@ -174,6 +182,7 @@ _cmd_close (int fd)
         pid_t pid;
 
         /* make sure the provided fd was opened */
+        long maxfd = mp_open_max();
         if (fd < 0 || fd > maxfd || !_cmd_pids || (pid = _cmd_pids[fd]) == 0)
                 return -1;
 
@@ -265,7 +274,6 @@ _cmd_fetch_output (int fd, output * op, int flags)
 int
 cmd_run (const char *cmdstring, output * out, output * err, int flags)
 {
-        int fd, pfd_out[2], pfd_err[2];
         int i = 0, argc;
         size_t cmdlen;
         char **argv = NULL;
@@ -369,10 +377,10 @@ cmd_file_read ( char *filename, output *out, int flags)
         if ((fd = open(filename, O_RDONLY)) == -1) {
                 die( STATE_UNKNOWN, _("Error opening %s: %s"), filename, strerror(errno) );
         }
-        
+
         if(out)
                 out->lines = _cmd_fetch_output (fd, out, flags);
-        
+
         if (close(fd) == -1)
                 die( STATE_UNKNOWN, _("Error closing %s: %s"), filename, strerror(errno) );
 
@@ -382,12 +390,12 @@ cmd_file_read ( char *filename, output *out, int flags)
 void
 timeout_alarm_handler (int signo)
 {
-        size_t i;
         if (signo == SIGALRM) {
                 printf (_("%s - Plugin timed out after %d seconds\n"),
                                                 state_text(timeout_state), timeout_interval);
 
-                if(_cmd_pids) for(i = 0; i < maxfd; i++) {
+                long maxfd = mp_open_max();
+                if(_cmd_pids) for(long int i = 0; i < maxfd; i++) {
                         if(_cmd_pids[i] != 0) kill(_cmd_pids[i], SIGKILL);
                 }