Set blocking mode to fd returned by accept

That addresses issues in OpenBSD where the fd is
set to non blocking when the accept's fd is non blocking.

src/common.c

@@ -177,6 +177,14 @@ int val;
 	fcntl(fd, F_SETFL, val | O_NONBLOCK);
 }
 
+void set_block(int fd)
+{
+int val;
+
+	val = fcntl(fd, F_GETFL, 0);
+	fcntl(fd, F_SETFL, val & (~O_NONBLOCK));
+}
+
 ssize_t recv_timeout(int sockfd, void *buf, size_t len, unsigned sec)
 {
 int ret;

src/common.h

@@ -36,6 +36,7 @@ void *_talloc_size2(void *ctx, size_t size);
 #define DEFAULT_SOCKET_TIMEOUT 10
 
 void set_non_block(int fd);
+void set_block(int fd);
 
 ssize_t force_write(int sockfd, const void *buf, size_t len);
 ssize_t force_read(int sockfd, void *buf, size_t len);

src/main.c

@@ -1111,6 +1111,10 @@ int main(int argc, char** argv)
 					continue;
 				}
 				set_cloexec_flag (fd, 1);
+#ifndef __linux__
+				/* OpenBSD sets the non-blocking flag if accept's fd is non-blocking */
+				set_block(fd);
+#endif
 
 				if (s->config->max_clients > 0 && s->active_clients >= s->config->max_clients) {
 					close(fd);