[PATCH spice-server v5 14/18] dispatcher: Port to Windows

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

Replace poll call with select.
As socket is set to non-blocking we must support it so if
we detect an EAGAIN error wait for data.

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 server/dispatcher.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/server/dispatcher.c b/server/dispatcher.c
index 9a49a9899..ae505efae 100644
--- a/server/dispatcher.c
+++ b/server/dispatcher.c
@@ -201,6 +201,7 @@ static int read_safe(int fd, uint8_t *buf, size_t size, int block)
     }
 
     if (!block) {
+#ifndef _WIN32
         struct pollfd pollfd = {.fd = fd, .events = POLLIN, .revents = 0};
         while ((ret = poll(&pollfd, 1, 0)) == -1) {
             if (errno == EINTR) {
@@ -213,6 +214,15 @@ static int read_safe(int fd, uint8_t *buf, size_t size, int block)
         if (!(pollfd.revents & POLLIN)) {
             return 0;
         }
+#else
+        struct timeval tv = { 0, 0 };
+        fd_set fds;
+        FD_ZERO(&fds);
+        FD_SET(fd, &fds);
+        if (select(1, &fds, NULL, NULL, &tv) < 1) {
+            return 0;
+        }
+#endif
     }
     while (read_size < size) {
         ret = socket_read(fd, buf + read_size, size - read_size);
@@ -221,6 +231,16 @@ static int read_safe(int fd, uint8_t *buf, size_t size, int block)
                 spice_debug("EINTR in read");
                 continue;
             }
+#ifdef _WIN32
+            // Windows turns this socket not-blocking
+            if (errno == EAGAIN) {
+                fd_set fds;
+                FD_ZERO(&fds);
+                FD_SET(fd, &fds);
+                select(1, &fds, NULL, NULL, NULL);
+                continue;
+            }
+#endif
             return -1;
         }
         if (ret == 0) {
-- 
2.20.1

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