ustream: avoid calling s->poll from a write path to avoid looping back through the...

[project/libubox.git] / ustream-fd.c

diff --git a/ustream-fd.c b/ustream-fd.c
index 6bb39e9..93fd501 100644 (file)
--- a/ustream-fd.c
+++ b/ustream-fd.c
@@ -21,7 +21,7 @@
 #include <stdio.h>
 #include "ustream.h"
 
-static void ustream_fd_set_uloop(struct ustream *s)
+static void ustream_fd_set_uloop(struct ustream *s, bool write)
 {
        struct ustream_fd *sf = container_of(s, struct ustream_fd, stream);
        struct ustream_buf *buf;
@@ -31,7 +31,7 @@ static void ustream_fd_set_uloop(struct ustream *s)
                flags |= ULOOP_READ;
 
        buf = s->w.head;
-       if (buf && s->w.data_bytes && !s->write_error)
+       if (write || (buf && s->w.data_bytes && !s->write_error))
                flags |= ULOOP_WRITE;
 
        uloop_fd_add(&sf->fd, flags);
@@ -40,6 +40,11 @@ static void ustream_fd_set_uloop(struct ustream *s)
                sf->fd.cb(&sf->fd, ULOOP_READ);
 }
 
+static void ustream_fd_set_read_blocked(struct ustream *s)
+{
+       ustream_fd_set_uloop(s, false);
+}
+
 static void ustream_fd_read_pending(struct ustream_fd *sf, bool *more)
 {
        struct ustream *s = &sf->stream;
@@ -89,9 +94,12 @@ retry:
                        goto retry;
 
                if (errno == EAGAIN || errno == EWOULDBLOCK)
-                       return 0;
+                       len = 0;
        }
 
+       if (len >= 0 && len < buflen)
+               ustream_fd_set_uloop(s, true);
+
        return len;
 }
 
@@ -105,13 +113,13 @@ static bool __ustream_fd_poll(struct ustream_fd *sf, unsigned int events)
                ustream_fd_read_pending(sf, &more);
 
        if (events & ULOOP_WRITE) {
-               if (ustream_write_pending(s))
-                       ustream_fd_set_uloop(s);
+               if (!ustream_write_pending(s))
+                       ustream_fd_set_uloop(s, false);
        }
 
        if (!s->eof && fd->eof) {
                s->eof = true;
-               ustream_fd_set_uloop(s);
+               ustream_fd_set_uloop(s, false);
                ustream_state_change(s);
        }
 
@@ -122,7 +130,7 @@ static bool ustream_fd_poll(struct ustream *s)
 {
        struct ustream_fd *sf = container_of(s, struct ustream_fd, stream);
 
-       return __ustream_fd_poll(sf, ULOOP_READ);
+       return __ustream_fd_poll(sf, ULOOP_READ | ULOOP_WRITE);
 }
 
 static void ustream_uloop_cb(struct uloop_fd *fd, unsigned int events)
@@ -147,9 +155,9 @@ void ustream_fd_init(struct ustream_fd *sf, int fd)
 
        sf->fd.fd = fd;
        sf->fd.cb = ustream_uloop_cb;
-       s->set_read_blocked = ustream_fd_set_uloop;
+       s->set_read_blocked = ustream_fd_set_read_blocked;
        s->write = ustream_fd_write;
        s->free = ustream_fd_free;
        s->poll = ustream_fd_poll;
-       ustream_fd_set_uloop(s);
+       ustream_fd_set_uloop(s, false);
 }