libubus: detect read/write errors and set the eof flag, even if uloop is not used...

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/libubus-io.c b/libubus-io.c
index 589ba20926d4cd2b4d513a2c4fcc6a905423ff3e..78943bc83ac1535b28e291d34a38c9665414f330 100644 (file)
--- a/libubus-io.c
+++ b/libubus-io.c
@@ -94,6 +94,7 @@ int __hidden ubus_send_msg(struct ubus_context *ctx, uint32_t seq,
        struct iovec iov[2] = {
                STATIC_IOV(hdr)
        };
+       int ret;
 
        hdr.version = 0;
        hdr.type = cmd;
@@ -108,37 +109,45 @@ int __hidden ubus_send_msg(struct ubus_context *ctx, uint32_t seq,
        iov[1].iov_base = (char *) msg;
        iov[1].iov_len = blob_raw_len(msg);
 
-       return writev_retry(ctx->sock.fd, iov, ARRAY_SIZE(iov));
+       ret = writev_retry(ctx->sock.fd, iov, ARRAY_SIZE(iov));
+       if (ret < 0)
+               ctx->sock.eof = true;
+
+       return ret;
 }
 
-static bool recv_retry(int fd, struct iovec *iov, bool wait)
+static int recv_retry(int fd, struct iovec *iov, bool wait)
 {
-       int bytes;
+       int bytes, total = 0;
 
        while (iov->iov_len > 0) {
                if (wait)
                        wait_data(fd, false);
 
                bytes = read(fd, iov->iov_base, iov->iov_len);
+               if (!bytes)
+                       return -1;
+
                if (bytes < 0) {
                        bytes = 0;
                        if (uloop_cancelled)
-                               return false;
+                               return 0;
                        if (errno == EINTR)
                                continue;
 
                        if (errno != EAGAIN)
-                               return false;
+                               return -1;
                }
                if (!wait && !bytes)
-                       return false;
+                       return 0;
 
                wait = true;
                iov->iov_len -= bytes;
                iov->iov_base += bytes;
+               total += bytes;
        }
 
-       return true;
+       return total;
 }
 
 static bool ubus_validate_hdr(struct ubus_msghdr *hdr)
@@ -158,11 +167,17 @@ static bool ubus_validate_hdr(struct ubus_msghdr *hdr)
 static bool get_next_msg(struct ubus_context *ctx)
 {
        struct iovec iov = STATIC_IOV(ctx->msgbuf.hdr);
+       int r;
 
        /* receive header + start attribute */
        iov.iov_len += sizeof(struct blob_attr);
-       if (!recv_retry(ctx->sock.fd, &iov, false))
+       r = recv_retry(ctx->sock.fd, &iov, false);
+       if (r <= 0) {
+               if (r < 0)
+                       ctx->sock.eof = true;
+
                return false;
+       }
 
        iov.iov_len = blob_len(ctx->msgbuf.hdr.data);
        if (iov.iov_len > 0 && !recv_retry(ctx->sock.fd, &iov, true))