Get the correct refcount on the temporary assignment to PL_sigwarn so

that other code assigning to $SIG{__WARN__} doesn't cause a premature
free.

p4raw-id: //depot/perl@24410

diff --git a/perlio.c b/perlio.c
index fbe8da2..f437222 100644 (file)
--- a/perlio.c
+++ b/perlio.c
@@ -762,7 +762,8 @@ PerlIO_find_layer(pTHX_ const char *name, STRLEN len, int load)
            ENTER;
            SAVEINT(PL_in_load_module);
            if (cv) {
-               SAVESPTR(PL_warnhook);
+               SAVEGENERICSV(PL_warnhook);
+               SvREFCNT_inc(cv);
                PL_warnhook = (SV *) cv;
            }
            PL_in_load_module++;
@@ -5039,3 +5040,13 @@ PerlIO_sprintf(char *s, int n, const char *fmt, ...)
     return result;
 }
 #endif
+
+/*
+ * Local variables:
+ * c-indentation-style: bsd
+ * c-basic-offset: 4
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vim: shiftwidth=4:
+*/

diff --git a/t/io/layers.t b/t/io/layers.t
index 79800dc..41c44c4 100644 (file)
--- a/t/io/layers.t
+++ b/t/io/layers.t
@@ -41,7 +41,7 @@ if (${^UNICODE} & 1) {
        $UNICODE_STDIN = 1;
     }
 }
-my $NTEST = 43 - (($DOSISH || !$FASTSTDIO) ? 7 : 0) - ($DOSISH ? 5 : 0)
+my $NTEST = 44 - (($DOSISH || !$FASTSTDIO) ? 7 : 0) - ($DOSISH ? 5 : 0)
     + $UNICODE_STDIN;
 
 sub PerlIO::F_UTF8 () { 0x00008000 } # from perliol.h
@@ -212,5 +212,12 @@ SKIP: {
        close G;
     }
 
+    # Check that PL_sigwarn's reference count is correct, and that 
+    # &PerlIO::Layer::NoWarnings isn't prematurely freed.
+    fresh_perl_like (<<'EOT', qr/^CODE/);
+open(UTF, "<:raw:encoding(utf8)", $^X) or die $!;
+print ref *PerlIO::Layer::NoWarnings{CODE};
+EOT
+
     1 while unlink "afile";
 }