use rb_gc_for_fd for more callers

* dir.c (dir_initialize): use rb_gc_for_fd for ENOMEM
* ext/socket/init.c (rsock_socket): ditto
* ext/socket/socket.c (rsock_socketpair): ditto
* internal.h (rb_gc_for_fd): prototype
* io.c (rb_gc_for_fd): remove static
  [ruby-core:71623] [Feature #11727]

Manpages for opendir(2), socket(2), and socketpair(3posix)
describe ENOMEM as a possible error for each of these;
handle it consistently with our existing wrappers for
open(2)/pipe(2) etc...

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52726 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 2 deletions

diff --git a/dir.c b/dir.c
index 05ad656fda..70e9bbd2cd 100644
--- a/dir.c
+++ b/dir.c
@@ -519,8 +519,7 @@ dir_initialize(int argc, VALUE *argv, VALUE dir)
     path = RSTRING_PTR(dirname);
     dp->dir = opendir(path);
     if (dp->dir == NULL) {
-	if (errno == EMFILE || errno == ENFILE) {
-	    rb_gc();
+	if (rb_gc_for_fd(errno)) {
 	    dp->dir = opendir(path);
 	}
 #ifdef HAVE_GETATTRLIST