* io.c (internal_{read,write}_func, rb_{read,write}_internal):

reverted r27265, since now rb_thread_blocking_region() preserves
  errno.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27403 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Tue Apr 20 00:41:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* io.c (internal_{read,write}_func, rb_{read,write}_internal):
+	  reverted r27265, since now rb_thread_blocking_region() preserves
+	  errno.
+
 Mon Apr 19 23:14:45 2010  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* thread.c (rb_thread_blocking_region, rb_thread_blocking_region_end):

io.c

@@ -530,7 +530,6 @@ wsplit_p(rb_io_t *fptr)
 
 struct io_internal_struct {
     int fd;
-    int saved_errno;
     void *buf;
     size_t capa;
 };
@@ -539,48 +538,36 @@ static VALUE
 internal_read_func(void *ptr)
 {
     struct io_internal_struct *iis = (struct io_internal_struct*)ptr;
-    ssize_t ret = read(iis->fd, iis->buf, iis->capa);
-    iis->saved_errno = errno;
-    return (VALUE)ret;
+    return read(iis->fd, iis->buf, iis->capa);
 }
 
 static VALUE
 internal_write_func(void *ptr)
 {
     struct io_internal_struct *iis = (struct io_internal_struct*)ptr;
-    ssize_t ret = write(iis->fd, iis->buf, iis->capa);
-    iis->saved_errno = errno;
-    return (VALUE)ret;
+    return write(iis->fd, iis->buf, iis->capa);
 }
 
 static ssize_t
 rb_read_internal(int fd, void *buf, size_t count)
 {
     struct io_internal_struct iis;
-    ssize_t ret;
-
     iis.fd = fd;
     iis.buf = buf;
     iis.capa = count;
 
-    ret = (ssize_t)rb_thread_blocking_region(internal_read_func, &iis, RUBY_UBF_IO, 0);
-    errno = iis.saved_errno;
-    return ret;
+    return (ssize_t)rb_thread_blocking_region(internal_read_func, &iis, RUBY_UBF_IO, 0);
 }
 
 static ssize_t
 rb_write_internal(int fd, void *buf, size_t count)
 {
     struct io_internal_struct iis;
-    ssize_t ret;
-
     iis.fd = fd;
     iis.buf = buf;
     iis.capa = count;
 
-    ret = (ssize_t)rb_thread_blocking_region(internal_write_func, &iis, RUBY_UBF_IO, 0);
-    errno = iis.saved_errno;
-    return ret;
+    return (ssize_t)rb_thread_blocking_region(internal_write_func, &iis, RUBY_UBF_IO, 0);
 }
 
 static long