linux: don't use accept4() syscall after ENOSYS

Repeatedly calling the syscall when it's not supported has a small but measurable performance impact. Besides, it's a silly thing to do.
joyent · Jun 29, 2012 · f6a02fb · f6a02fb
1 parent 27cd5f0
commit f6a02fb
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/src/unix/core.c b/src/unix/core.c
@@ -426,6 +426,11 @@ int uv__accept(int sockfd) {
 
   while (1) {
 #if __linux__
+    static int no_accept4;
+
+    if (no_accept4)
+      goto skip;
+
     peerfd = uv__accept4(sockfd,
                          NULL,
                          NULL,
@@ -439,6 +444,9 @@ int uv__accept(int sockfd) {
 
     if (errno != ENOSYS)
       break;
+
+    no_accept4 = 1;
+skip:
 #endif
 
     peerfd = accept(sockfd, NULL, NULL);