diff --git a/src/wl_window.c b/src/wl_window.c
index 64a83d16..3407370a 100644
--- a/src/wl_window.c
+++ b/src/wl_window.c
@@ -24,6 +24,8 @@
 //
 //========================================================================
 
+#define _GNU_SOURCE
+
 #include "internal.h"
 
 #include <stdio.h>
@@ -101,43 +103,13 @@ static GLboolean createSurface(_GLFWwindow* window,
 }
 
 static int
-set_cloexec_or_close(int fd)
-{
-    long flags;
-
-    if (fd == -1)
-        return -1;
-
-    flags = fcntl(fd, F_GETFD);
-    if (flags == -1)
-        goto err;
-
-    if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1)
-        goto err;
-
-    return fd;
-
-err:
-    close(fd);
-    return -1;
-}
-
-static int
-create_tmpfile_cloexec(char *tmpname)
+createTmpfileCloexec(char* tmpname)
 {
     int fd;
 
-#ifdef HAVE_MKOSTEMP
     fd = mkostemp(tmpname, O_CLOEXEC);
     if (fd >= 0)
         unlink(tmpname);
-#else
-    fd = mkstemp(tmpname);
-    if (fd >= 0) {
-        fd = set_cloexec_or_close(fd);
-        unlink(tmpname);
-    }
-#endif
 
     return fd;
 }
@@ -157,23 +129,23 @@ create_tmpfile_cloexec(char *tmpname)
  * transmitting the file descriptor over Unix sockets using the
  * SCM_RIGHTS methods.
  *
- * If the C library implements posix_fallocate(), it is used to
- * guarantee that disk space is available for the file at the
- * given size. If disk space is insufficent, errno is set to ENOSPC.
- * If posix_fallocate() is not supported, program may receive
- * SIGBUS on accessing mmap()'ed file contents instead.
+ * posix_fallocate() is used to guarantee that disk space is available
+ * for the file at the given size. If disk space is insufficent, errno
+ * is set to ENOSPC. If posix_fallocate() is not supported, program may
+ * receive SIGBUS on accessing mmap()'ed file contents instead.
  */
 int
-os_create_anonymous_file(off_t size)
+createAnonymousFile(off_t size)
 {
     static const char template[] = "/glfw-shared-XXXXXX";
-    const char *path;
-    char *name;
+    const char* path;
+    char* name;
     int fd;
     int ret;
 
     path = getenv("XDG_RUNTIME_DIR");
-    if (!path) {
+    if (!path)
+    {
         errno = ENOENT;
         return -1;
     }
@@ -182,14 +154,15 @@ os_create_anonymous_file(off_t size)
     strcpy(name, path);
     strcat(name, template);
 
-    fd = create_tmpfile_cloexec(name);
+    fd = createTmpfileCloexec(name);
 
     free(name);
 
     if (fd < 0)
         return -1;
     ret = posix_fallocate(fd, 0, size);
-    if (ret != 0) {
+    if (ret != 0)
+    {
         close(fd);
         errno = ret;
         return -1;
@@ -403,7 +376,7 @@ int _glfwPlatformCreateCursor(_GLFWcursor* cursor,
     void *data;
     int fd, i;
 
-    fd = os_create_anonymous_file(length);
+    fd = createAnonymousFile(length);
     if (fd < 0) {
         _glfwInputError(GLFW_PLATFORM_ERROR,
                     "Wayland: Creating a buffer file for %d B failed: %m\n",