From: Jarkko Hietaniemi <jhi@iki.fi>
Date: Sat, 5 Jul 2003 18:40:51 +0000 (+0000)
Subject: Make a read from a write-only fh to set errno
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=862083f7e40bc2a9e3b94aedce56c1336e7bdb25;p=p5sagit%2Fp5-mst-13.2.git

Make a read from a write-only fh to set errno
(found by Gisle)

p4raw-id: //depot/perl@20019
---

diff --git a/perlio.c b/perlio.c
index 78b2d18..b0649df 100644
--- a/perlio.c
+++ b/perlio.c
@@ -2033,8 +2033,11 @@ PerlIOBase_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
 {
     STDCHAR *buf = (STDCHAR *) vbuf;
     if (f) {
-	if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD))
+        if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD)) {
+	    PerlIOBase(f)->flags |= PERLIO_F_ERROR;
+	    SETERRNO(EBADF, SS_IVCHAN);
 	    return 0;
+	}
 	while (count > 0) {
 	    SSize_t avail = PerlIO_get_cnt(f);
 	    SSize_t take = 0;