pipe2 where possible

CMakeLists.txt

@@ -567,6 +567,7 @@ include(CheckIncludeFile)
 include(CheckIncludeFiles)
 include(CheckLibraryExists)
 include(CheckTypeSize)
+include(CheckCSourceCompiles)
 
 if (LWS_WITHOUT_BUILTIN_SHA1)
 	set(LWS_SHA1_USE_OPENSSL_NAME 1)
@@ -1359,6 +1360,11 @@ else()
 CHECK_FUNCTION_EXISTS(TLS_client_method LWS_HAVE_TLS_CLIENT_METHOD)
 CHECK_FUNCTION_EXISTS(TLSv1_2_client_method LWS_HAVE_TLSV1_2_CLIENT_METHOD)
 endif()
+
+# ideally we want to use pipe2()
+
+CHECK_C_SOURCE_COMPILES("#define _GNU_SOURCE\n#include <unistd.h>\nint main(void) {int fd[2];\n return pipe2(fd, 0);\n}\n" LWS_HAVE_PIPE2)
+
 set(CMAKE_REQUIRED_LIBRARIES ${temp})
 # Generate the lws_config.h that includes all the public compilation settings.
 configure_file(

cmake/lws_config.h.in

@@ -164,6 +164,8 @@
 
 #cmakedefine LWS_HAVE_MALLOC_H
 
+#cmakedefine LWS_HAVE_PIPE2
+
 /* OpenSSL various APIs */
 
 #cmakedefine LWS_HAVE_TLS_CLIENT_METHOD

lib/plat/lws-plat-unix.c

@@ -19,6 +19,7 @@
  *  MA  02110-1301  USA
  */
 
+#define _GNU_SOURCE
 #include "private-libwebsockets.h"
 
 #include <pwd.h>
@@ -40,7 +41,11 @@ lws_plat_pipe_create(struct lws *wsi)
 {
 	struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
 
+#if defined(LWS_HAVE_PIPE2)
+	return pipe2(pt->dummy_pipe_fds, O_NONBLOCK);
+#else
 	return pipe(pt->dummy_pipe_fds);
+#endif
 }
 
 int

lib/roles/pipe/ops-pipe.c

@@ -26,7 +26,7 @@ rops_handle_POLLIN_pipe(struct lws_context_per_thread *pt, struct lws *wsi,
 			struct lws_pollfd *pollfd)
 {
 #if !defined(WIN32) && !defined(_WIN32)
-	char s[10];
+	char s[100];
 	int n;
 
 	/*