server.c: Multiplex client events

Future commits would allow user-defined callbacks to write zero, one or
more bytes to a file descriptor. If zero bytes were written, server_poll
must avoid to always point to the same server_client, so that other
requests from other server_client instances can still be handled.

1 files changed, 15 insertions, 4 deletions

diff --git a/server.c b/server.c
index 4c19439..dec3080 100644
--- a/server.c
+++ b/server.c
@@ -13,7 +13,7 @@
 
 struct server
 {
-    int fd, cfds[2];
+    int fd, cfds[2], lastfd;
 
     struct server_client
     {
@@ -267,6 +267,8 @@ again:
         goto end;
     }
 
+    struct server_client *sel = NULL;
+
     for (struct {struct server_client *c; size_t j;}
         _ = {.c = s->c, .j = CLIENTS}; _.c; _.c = _.c->next, _.j++)
     {
@@ -274,12 +276,21 @@ again:
 
         if (p->revents)
         {
-            *io = true;
-            ret = _.c;
-            goto end;
+            sel = _.c;
+
+            if (n_clients == 1 || p->fd != s->lastfd)
+                break;
         }
     }
 
+    if (sel)
+    {
+        *io = true;
+        ret = sel;
+        s->lastfd = sel->fd;
+        goto end;
+    }
+
     fprintf(stderr, "%s: unlisted fd\n", __func__);
 
 end: