+
+
+/*
+ * run-program - execute a program with given arguments,
+ * but don't wait for it.
+ * If the program can't be executed, logs an error unless
+ * must_exist is 0 and the program file doesn't exist.
+ */
+static int n_children;
+
+int
+run_program(prog, args, must_exist)
+ char *prog;
+ char **args;
+ int must_exist;
+{
+ int pid;
+
+ pid = fork();
+ if (pid == -1) {
+ syslog(LOG_ERR, "can't fork to run %s: %m", prog);
+ return -1;
+ }
+ if (pid == 0) {
+ execv(prog, args);
+ if (must_exist || errno != ENOENT)
+ syslog(LOG_WARNING, "can't execute %s: %m", prog);
+ _exit(-1);
+ }
+ MAINDEBUG(("Script %s started; pid = %d", prog, pid));
+ ++n_children;
+ return 0;
+}
+
+
+/*
+ * reap_kids - get status from any dead child processes,
+ * and log a message for abnormal terminations.
+ */
+void
+reap_kids()
+{
+ int pid, status;
+
+ if (n_children == 0)
+ return;
+ if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
+ if (errno != ECHILD)
+ syslog(LOG_ERR, "waitpid: %m");
+ return;
+ }
+ --n_children;
+ if (WIFSIGNALED(status)) {
+ syslog(LOG_WARNING, "child process %d terminated with signal %d",
+ pid, WTERMSIG(status));
+ }
+}