prefer rb_syserr_fail

* file.c, io.c, util.c: prefer rb_syserr_fail with saved errno
  over setting errno then call rb_sys_fail, not to be clobbered
  potentially and to reduce thread local errno accesses.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53264 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 5 insertions, 3 deletions

diff --git a/util.c b/util.c
index 89dec0d19b..95ac2b09b5 100644
--- a/util.c
+++ b/util.c
@@ -507,9 +507,10 @@ ruby_getcwd(void)
     char *buf = xmalloc(size);
 
     while (!getcwd(buf, size)) {
-	if (errno != ERANGE) {
+	int e = errno;
+	if (e != ERANGE) {
 	    xfree(buf);
-	    rb_sys_fail("getcwd");
+	    rb_syserr_fail(e, "getcwd");
 	}
 	size *= 2;
 	buf = xrealloc(buf, size);
@@ -527,8 +528,9 @@ ruby_getcwd(void)
     char *buf = xmalloc(PATH_MAX+1);
 
     if (!getwd(buf)) {
+	int e = errno;
 	xfree(buf);
-	rb_sys_fail("getwd");
+	rb_syserr_fail(e, "getwd");
     }
 #endif
     return buf;