merges r22099 from trunk into ruby_1_9_1.

* io.c (io_fread): use rb_io_wait_readable for retry
  avoid Errno::EINTR on ruby -e 'trap(:CHLD) {}; spawn("sleep 1"); STDIN.read'

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@22518 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/io.c b/io.c
index 7a9695c379..50eaa5f261 100644
--- a/io.c
+++ b/io.c
@@ -1428,12 +1428,15 @@ io_fread(VALUE str, long offset, rb_io_t *fptr)
 
     if (READ_DATA_PENDING(fptr) == 0) {
 	while (n > 0) {
+          again:
 	    c = rb_read_internal(fptr->fd, RSTRING_PTR(str)+offset, n);
 	    if (c == 0) {
 		io_set_eof(fptr);
 		break;
 	    }
 	    if (c < 0) {
+                if (rb_io_wait_readable(fptr->fd))
+                    goto again;
 		rb_sys_fail_path(fptr->pathv);
 	    }
 	    offset += c;