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log exec failures: at least the user should know...

--- a/mbox.c

+++ b/mbox.c

@@ -767,6 +767,19 @@

 }

 static void

+execlog(void*)

+{

+	Waitmsg *w;

+

+	while(1){

+		w = recvp(cwait);

+		if(w->msg[0] != 0)

+			fprint(2, "%d: %s\n", w->pid, w->msg);

+		free(w);

+	}

+} 

+

+static void

 mbmain(void*)

 {

 	Event *ev;

@@ -862,10 +875,13 @@

 	mbload();

 	proccreate(plumbseemail, nil, Stack);

 	proccreate(plumbshowmail, nil, Stack);

+

+	/* avoid duplicate sends when multiple mailboxes are open */

 	if(sender || strcmp(mailbox, "mbox") == 0){

 		plumbsendmailfd = plumbopen("sendmail", OREAD|OCEXEC);

 		proccreate(plumbsendmail, nil, Stack);

 	}

+	threadcreate(execlog, nil, Stack);

 	threadcreate(mbmain, nil, Stack);

 	threadexits(nil);

 }