lib: Log EGAINs again, but attempt to do so sparingly.

diff --git a/lib/cf.c b/lib/cf.c
index 5a6388e..bd4aba3 100644 (file)
--- a/lib/cf.c
+++ b/lib/cf.c
@@ -43,6 +43,7 @@ struct stdchild {
     char **argv;
     char **envp;
     int fd;
+    int agains;
 };
 
 static int parsefile(struct cfstate *s, FILE *in);
@@ -385,16 +386,24 @@ static int stdhandle(struct child *ch, struct hthead *req, int fd, void (*chinit
                sd->fd = stdmkchild(args, stdinit, idata);
                freeca(args);
                if(!sendreq2(sd->fd, req, fd, MSG_NOSIGNAL | MSG_DONTWAIT))
-                   return(0);
+                   goto ok;
                serr = errno;
            }
-           if(serr != EAGAIN) {
+           if(serr == EAGAIN) {
+               if(sd->agains++ == 0)
+                   flog(LOG_WARNING, "request to child %s denied due to buffer overload", ch->name);
+           } else {
                flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(serr));
                close(sd->fd);
                sd->fd = -1;
            }
            return(-1);
        }
+    ok:
+       if(sd->agains > 0) {
+           flog(LOG_WARNING, "%i requests to child %s were denied due to buffer overload", sd->agains, ch->name);
+           sd->agains = 0;
+       }
     } else if(sd->type == CH_FORK) {
        args = expandargs(sd);
        if(stdforkserve(args, req, fd, chinit, idata) < 0) {