Mark a bunch of constructors as explicit

This prevents undesired implicit conversions

src/proc.cpp

@@ -354,8 +354,6 @@ int job_signal(job_t *j, int signal)
 
 /**
    Store the status of the process pid that was returned by waitpid.
-   Return 0 if all went well, nonzero otherwise.
-   This is called from a signal handler.
 */
 static void mark_process_status(const job_t *j, process_t *p, int status)
 {
@@ -374,18 +372,7 @@ static void mark_process_status(const job_t *j, process_t *p, int status)
     {
         /* This should never be reached */
         p->completed = 1;
-
-        char mess[MESS_SIZE];
-        snprintf(mess,
-                 MESS_SIZE,
-                 "Process %ld exited abnormally\n",
-                 (long) p->pid);
-        /*
-          If write fails, do nothing. We're in a signal handlers error
-          handler. If things aren't working properly, it's safer to
-          give up.
-         */
-        write_ignore(2, mess, strlen(mess));
+        fprintf(stderr, "Process %ld exited abnormally\n", (long)p->pid);
     }
 }
 
@@ -399,10 +386,8 @@ void job_mark_process_as_failed(const job_t *job, process_t *p)
 }
 
 /**
-   Handle status update for child \c pid. This function is called by
-   the signal handler, so it mustn't use malloc or any such hitech
-   nonsense.
-
+   Handle status update for child \c pid.
+ 
    \param pid the pid of the process whose status changes
    \param status the status as returned by wait
 */
@@ -411,14 +396,6 @@ static void handle_child_status(pid_t pid, int status)
     bool found_proc = false;
     const job_t *j = NULL;
     process_t *p = NULL;
-//	char mess[MESS_SIZE];
-    /*
-      snprintf( mess,
-      MESS_SIZE,
-      "Process %d\n",
-      (int) pid );
-      write( 2, mess, strlen(mess ));
-    */
 
     job_iterator_t jobs;
     while (! found_proc && (j = jobs.next()))