[perl #948] [PATCH] Allow tied $,

[perl5.git] / perlio.c

diff --git a/perlio.c b/perlio.c
index ed829e4..a3ea344 100644 (file)
--- a/perlio.c
+++ b/perlio.c
@@ -1,7 +1,7 @@
 /*
  * perlio.c
  * Copyright (c) 1996-2006, Nick Ing-Simmons
- * Copyright (c) 2006, 2007, Larry Wall and others
+ * Copyright (c) 2006, 2007, 2008 Larry Wall and others
  *
  * You may distribute under the terms of either the GNU General Public License
  * or the Artistic License, as specified in the README file.
@@ -10,6 +10,8 @@
 /*
  * Hour after hour for nearly three weary days he had jogged up and down,
  * over passes, and through long dales, and across many streams.
+ *
+ *     [pp.791-792 of _The Lord of the Rings_, V/iii: "The Muster of Rohan"]
  */
 
 /* This file contains the functions needed to implement PerlIO, which
@@ -810,7 +812,7 @@ PerlIO_find_layer(pTHX_ const char *name, STRLEN len, int load)
            SAVEINT(PL_in_load_module);
            if (cv) {
                SAVEGENERICSV(PL_warnhook);
-               PL_warnhook = (SV *) (SvREFCNT_inc_simple_NN(cv));
+               PL_warnhook = MUTABLE_SV((SvREFCNT_inc_simple_NN(cv)));
            }
            PL_in_load_module++;
            /*
@@ -832,7 +834,7 @@ static int
 perlio_mg_set(pTHX_ SV *sv, MAGIC *mg)
 {
     if (SvROK(sv)) {
-       IO * const io = GvIOn((GV *) SvRV(sv));
+       IO * const io = GvIOn(MUTABLE_GV(SvRV(sv)));
        PerlIO * const ifp = IoIFP(io);
        PerlIO * const ofp = IoOFP(io);
        Perl_warn(aTHX_ "set %" SVf " %p %p %p",
@@ -845,7 +847,7 @@ static int
 perlio_mg_get(pTHX_ SV *sv, MAGIC *mg)
 {
     if (SvROK(sv)) {
-       IO * const io = GvIOn((GV *) SvRV(sv));
+       IO * const io = GvIOn(MUTABLE_GV(SvRV(sv)));
        PerlIO * const ifp = IoIFP(io);
        PerlIO * const ofp = IoOFP(io);
        Perl_warn(aTHX_ "get %" SVf " %p %p %p",
@@ -884,7 +886,7 @@ XS(XS_io_MODIFY_SCALAR_ATTRIBUTES)
     MAGIC *mg;
     int count = 0;
     int i;
-    sv_magic(sv, (SV *) av, PERL_MAGIC_ext, NULL, 0);
+    sv_magic(sv, MUTABLE_SV(av), PERL_MAGIC_ext, NULL, 0);
     SvRMAGICAL_off(sv);
     mg = mg_find(sv, PERL_MAGIC_ext);
     mg->mg_virtual = &perlio_vtab;
@@ -1295,7 +1297,7 @@ PerlIORaw_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
        while (t && (l = *t)) {
            if (l->tab->Binmode) {
                /* Has a handler - normal case */
-               if ((*l->tab->Binmode)(aTHX_ f) == 0) {
+               if ((*l->tab->Binmode)(aTHX_ t) == 0) {
                    if (*t == l) {
                        /* Layer still there - move down a layer */
                        t = PerlIONext(t);
@@ -3131,6 +3133,9 @@ PerlIOStdio_close(pTHX_ PerlIO *f)
        IV result = 0;
        int saveerr = 0;
        int dupfd = -1;
+#ifdef USE_ITHREADS
+       dVAR;
+#endif
 #ifdef SOCKS5_VERSION_NAME
        /* Socks lib overrides close() but stdio isn't linked to
           that library (though we are) - so we must call close()
@@ -3141,8 +3146,15 @@ PerlIOStdio_close(pTHX_ PerlIO *f)
        if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *) &optval, &optlen) == 0)
            invalidate = 1;
 #endif
-       if (PerlIOUnix_refcnt_dec(fd) > 0) /* File descriptor still in use */
+       /* Test for -1, as *BSD stdio (at least) on fclose sets the FILE* such
+          that a subsequent fileno() on it returns -1. Don't want to croak()
+          from within PerlIOUnix_refcnt_dec() if some buggy caller code is
+          trying to close an already closed handle which somehow it still has
+          a reference to. (via.xs, I'm looking at you).  */
+       if (fd != -1 && PerlIOUnix_refcnt_dec(fd) > 0) {
+           /* File descriptor still in use */
            invalidate = 1;
+       }
        if (invalidate) {
            /* For STD* handles, don't close stdio, since we shared the FILE *, too. */
            if (stdio == stdin) /* Some stdios are buggy fflush-ing inputs */
@@ -3159,20 +3171,20 @@ PerlIOStdio_close(pTHX_ PerlIO *f)
            if (!invalidate) {
 #ifdef USE_ITHREADS
                MUTEX_LOCK(&PL_perlio_mutex);
-               /* Right. We need a mutex here because for a brief while we will
-                  have the situation that fd is actually closed. Hence if a
-                  second thread were to get into this block, its dup() would
-                  likely return our fd as its dupfd. (after all, it is closed).
+               /* Right. We need a mutex here because for a brief while we
+                  will have the situation that fd is actually closed. Hence if
+                  a second thread were to get into this block, its dup() would
+                  likely return our fd as its dupfd. (after all, it is closed)
                   Then if we get to the dup2() first, we blat the fd back
                   (messing up its temporary as a side effect) only for it to
                   then close its dupfd (== our fd) in its close(dupfd) */
 
                /* There is, of course, a race condition, that any other thread
                   trying to input/output/whatever on this fd will be stuffed
-                  for the duraction of this little manoeuver. Perhaps we should
-                  hold an IO mutex for the duration of every IO operation if
-                  we know that invalidate doesn't work on this platform, but
-                  that would suck, and could kill performance.
+                  for the duration of this little manoeuvrer. Perhaps we
+                  should hold an IO mutex for the duration of every IO
+                  operation if we know that invalidate doesn't work on this
+                  platform, but that would suck, and could kill performance.
 
                   Except that correctness trumps speed.
                   Advice from klortho #11912. */
@@ -4628,9 +4640,7 @@ PerlIOCrlf_binmode(pTHX_ PerlIO *f)
        PerlIOBase(f)->flags &= ~PERLIO_F_CRLF;
 #ifndef PERLIO_USING_CRLF
        /* CRLF is unusual case - if this is just the :crlf layer pop it */
-       if (PerlIOBase(f)->tab == &PerlIO_crlf) {
-               PerlIO_pop(aTHX_ f);
-       }
+       PerlIO_pop(aTHX_ f);
 #endif
     }
     return 0;