/*
* 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.
/*
* 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
*/
#ifdef DOSISH
# if defined(atarist) || defined(__MINT__)
+ PERL_UNUSED_ARG(iotype);
if (!fflush(fp)) {
if (mode & O_BINARY)
((FILE *) fp)->_flag |= _IOBIN;
return 0;
# else
dTHX;
+ PERL_UNUSED_ARG(iotype);
#ifdef NETWARE
if (PerlLIO_setmode(fp, mode) != -1) {
#else
#else
# if defined(USEMYBINMODE)
dTHX;
+# if defined(__CYGWIN__)
+ PERL_UNUSED_ARG(iotype);
+# endif
if (my_binmode(fp, iotype, mode) != FALSE)
return 1;
else
#else
const char *s = CopFILE(PL_curcop);
STRLEN len;
- SV * const sv = newSVpvs("");
- Perl_sv_catpvf(aTHX_ sv, "%s:%" IVdf " ", s ? s : "(none)",
- (IV) CopLINE(PL_curcop));
+ SV * const sv = Perl_newSVpvf(aTHX_ "%s:%" IVdf " ", s ? s : "(none)",
+ (IV) CopLINE(PL_curcop));
Perl_sv_vcatpvf(aTHX_ sv, fmt, &ap);
s = SvPV_const(sv, len);
PerlIOl *l = PerlIOBase(f);
while (l) {
+ /* There is some collusion in the implementation of
+ XS_PerlIO_get_layers - it knows that name and flags are
+ generated as fresh SVs here, and takes advantage of that to
+ "copy" them by taking a reference. If it changes here, it needs
+ to change there too. */
SV * const name = l->tab && l->tab->name ?
newSVpv(l->tab->name, 0) : &PL_sv_undef;
SV * const arg = l->tab && l->tab->Getarg ?
} else {
SV * const pkgsv = newSVpvs("PerlIO");
SV * const layer = newSVpvn(name, len);
- CV * const cv = get_cv("PerlIO::Layer::NoWarnings", FALSE);
+ CV * const cv = get_cvs("PerlIO::Layer::NoWarnings", 0);
ENTER;
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++;
/*
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",
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",
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;
SV *
PerlIO_tab_sv(pTHX_ PerlIO_funcs *tab)
{
- HV * const stash = gv_stashpvs("PerlIO::Layer", TRUE);
+ HV * const stash = gv_stashpvs("PerlIO::Layer", GV_ADD);
SV * const sv = sv_bless(newRV_noinc(newSViv(PTR2IV(tab))), stash);
return sv;
}
*/
dVAR;
dXSARGS;
+ PERL_UNUSED_ARG(cv);
if (items)
PerlIO_debug("warning:%s\n",SvPV_nolen_const(ST(0)));
XSRETURN(0);
{
dVAR;
dXSARGS;
+ PERL_UNUSED_ARG(cv);
if (items < 2)
Perl_croak(aTHX_ "Usage class->find(name[,load])");
else {
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);
SSize_t
Perl_PerlIO_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
{
+ PERL_ARGS_ASSERT_PERLIO_READ;
+
Perl_PerlIO_or_Base(f, Read, read, -1, (aTHX_ f, vbuf, count));
}
SSize_t
Perl_PerlIO_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
{
+ PERL_ARGS_ASSERT_PERLIO_UNREAD;
+
Perl_PerlIO_or_Base(f, Unread, unread, -1, (aTHX_ f, vbuf, count));
}
SSize_t
Perl_PerlIO_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
{
+ PERL_ARGS_ASSERT_PERLIO_WRITE;
+
Perl_PerlIO_or_fail(f, Write, -1, (aTHX_ f, vbuf, count));
}
int
PerlIO_fast_gets(PerlIO *f)
{
- if (PerlIOValid(f) && (PerlIOBase(f)->flags & PERLIO_F_FASTGETS)) {
- const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
+ if (PerlIOValid(f)) {
+ if (PerlIOBase(f)->flags & PERLIO_F_FASTGETS) {
+ const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
- if (tab)
- return (tab->Set_ptrcnt != NULL);
- SETERRNO(EINVAL, LIB_INVARG);
+ if (tab)
+ return (tab->Set_ptrcnt != NULL);
+ SETERRNO(EINVAL, LIB_INVARG);
+ }
}
else
SETERRNO(EBADF, SS_IVCHAN);
if (self->Getarg)
arg = (*self->Getarg)(aTHX_ o, param, flags);
f = PerlIO_push(aTHX_ f, self, PerlIO_modestr(o,buf), arg);
+ if (PerlIOBase(o)->flags & PERLIO_F_UTF8)
+ PerlIOBase(f)->flags |= PERLIO_F_UTF8;
if (arg)
SvREFCNT_dec(arg);
}
}
}
-void PerlIO_teardown(pTHX) /* Call only from PERL_SYS_TERM(). */
+void PerlIO_teardown(void) /* Call only from PERL_SYS_TERM(). */
{
dVAR;
+#if 0
+/* XXX we can't rely on an interpreter being present at this late stage,
+ XXX so we can't use a function like PerlLIO_write that relies on one
+ being present (at least in win32) :-(.
+ Disable for now.
+*/
#ifdef DEBUGGING
{
/* By now all filehandles should have been closed, so any
* stray (non-STD-)filehandles indicate *possible* (PerlIO)
* errors. */
+#define PERLIO_TEARDOWN_MESSAGE_BUF_SIZE 64
+#define PERLIO_TEARDOWN_MESSAGE_FD 2
+ char buf[PERLIO_TEARDOWN_MESSAGE_BUF_SIZE];
int i;
for (i = 3; i < PL_perlio_fd_refcnt_size; i++) {
- if (PL_perlio_fd_refcnt[i])
- PerlIO_debug("PerlIO_cleanup: fd %d refcnt=%d\n",
- i, PL_perlio_fd_refcnt[i]);
+ if (PL_perlio_fd_refcnt[i]) {
+ const STRLEN len =
+ my_snprintf(buf, sizeof(buf),
+ "PerlIO_teardown: fd %d refcnt=%d\n",
+ i, PL_perlio_fd_refcnt[i]);
+ PerlLIO_write(PERLIO_TEARDOWN_MESSAGE_FD, buf, len);
+ }
}
}
#endif
+#endif
/* Not bothering with PL_perlio_mutex since by now
* all the interpreters are gone. */
if (PL_perlio_fd_refcnt_size /* Assuming initial size of zero. */
if ((f = PerlIO_push(aTHX_(f = PerlIO_allocate(aTHX)), PERLIO_FUNCS_CAST(&PerlIO_stdio), mode, NULL))) {
s = PerlIOSelf(f, PerlIOStdio);
s->stdio = stdio;
+ PerlIOUnix_refcnt_inc(fileno(stdio));
}
}
return f;
stdio = PerlSIO_fdopen(fd, PerlIO_modestr(o,mode));
set_this:
PerlIOSelf(f, PerlIOStdio)->stdio = stdio;
- PerlIOUnix_refcnt_inc(fileno(stdio));
+ if(stdio) {
+ PerlIOUnix_refcnt_inc(fileno(stdio));
+ }
}
return f;
}
const int fd = fileno(stdio);
int invalidate = 0;
IV result = 0;
- int saveerr = 0;
- int dupfd = 0;
+ int dupfd = -1;
+ dSAVEDERRNO;
+#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()
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 */
fileno slot of the FILE *
*/
result = PerlIO_flush(f);
- saveerr = errno;
+ SAVE_ERRNO;
invalidate = PerlIOStdio_invalidate_fileno(aTHX_ stdio);
- if (!invalidate)
+ 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)
+ 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 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. */
+#endif
dupfd = PerlLIO_dup(fd);
+#ifdef USE_ITHREADS
+ if (dupfd < 0) {
+ MUTEX_UNLOCK(&PL_perlio_mutex);
+ /* Oh cXap. This isn't going to go well. Not sure if we can
+ recover from here, or if closing this particular FILE *
+ is a good idea now. */
+ }
+#endif
+ }
+ } else {
+ SAVE_ERRNO; /* This is here only to silence compiler warnings */
}
result = PerlSIO_fclose(stdio);
/* We treat error from stdio as success if we invalidated
errno may NOT be expected EBADF
*/
if (invalidate && result != 0) {
- errno = saveerr;
+ RESTORE_ERRNO;
result = 0;
}
#ifdef SOCKS5_VERSION_NAME
/* in SOCKS' case, let close() determine return value */
result = close(fd);
#endif
- if (dupfd) {
+ if (dupfd >= 0) {
PerlLIO_dup2(dupfd,fd);
PerlLIO_close(dupfd);
+#ifdef USE_ITHREADS
+ MUTEX_UNLOCK(&PL_perlio_mutex);
+#endif
}
return result;
}
/*
* Not writeable - sync by attempting a seek
*/
- const int err = errno;
+ dSAVE_ERRNO;
if (PerlSIO_fseek(stdio, (Off_t) 0, SEEK_CUR) != 0)
- errno = err;
+ RESTORE_ERRNO;
#endif
}
return 0;
#ifdef STDIO_PTR_LVALUE
PerlSIO_set_ptr(stdio, ptr); /* LHS STDCHAR* cast non-portable */
#ifdef STDIO_PTR_LVAL_SETS_CNT
- if (PerlSIO_get_cnt(stdio) != (cnt)) {
- assert(PerlSIO_get_cnt(stdio) == (cnt));
- }
+ assert(PerlSIO_get_cnt(stdio) == (cnt));
#endif
#if (!defined(STDIO_PTR_LVAL_NOCHANGE_CNT))
/*
if (PerlSIO_fflush(stdio) != 0)
return EOF;
}
- c = PerlSIO_fgetc(stdio);
- if (c == EOF)
- return EOF;
+ for (;;) {
+ c = PerlSIO_fgetc(stdio);
+ if (c != EOF)
+ break;
+ if (! PerlSIO_ferror(stdio) || errno != EINTR)
+ return EOF;
+ PERL_ASYNC_CHECK();
+ SETERRNO(0,0);
+ }
#if (defined(STDIO_PTR_LVALUE) && (defined(STDIO_CNT_LVALUE) || defined(STDIO_PTR_LVAL_SETS_CNT)))
if ((f2 = PerlIO_push(aTHX_ f, PERLIO_FUNCS_CAST(&PerlIO_stdio), buf, NULL))) {
PerlIOStdio *s = PerlIOSelf((f = f2), PerlIOStdio);
s->stdio = stdio;
+ PerlIOUnix_refcnt_inc(fileno(stdio));
/* Link previous lower layers under new one */
*PerlIONext(f) = l;
}
PerlIO_findFILE(PerlIO *f)
{
PerlIOl *l = *f;
+ FILE *stdio;
while (l) {
if (l->tab == &PerlIO_stdio) {
PerlIOStdio *s = PerlIOSelf(&l, PerlIOStdio);
l = *PerlIONext(&l);
}
/* Uses fallback "mode" via PerlIO_modestr() in PerlIO_exportFILE */
- return PerlIO_exportFILE(f, NULL);
+ /* However, we're not really exporting a FILE * to someone else (who
+ becomes responsible for closing it, or calling PerlIO_releaseFILE())
+ So we need to undo its refernce count increase on the underlying file
+ descriptor. We have to do this, because if the loop above returns you
+ the FILE *, then *it* didn't increase any reference count. So there's
+ only one way to be consistent. */
+ stdio = PerlIO_exportFILE(f, NULL);
+ if (stdio) {
+ const int fd = fileno(stdio);
+ if (fd >= 0)
+ PerlIOUnix_refcnt_dec(fd);
+ }
+ return stdio;
}
/* Use this to reverse PerlIO_exportFILE calls. */
PerlIOStdio *s = PerlIOSelf(&l, PerlIOStdio);
if (s->stdio == f) {
dTHX;
+ const int fd = fileno(f);
+ if (fd >= 0)
+ PerlIOUnix_refcnt_dec(fd);
PerlIO_pop(aTHX_ p);
return;
}
PerlIOBuf_set_ptrcnt(pTHX_ PerlIO *f, STDCHAR * ptr, SSize_t cnt)
{
PerlIOBuf * const b = PerlIOSelf(f, PerlIOBuf);
+#ifndef DEBUGGING
+ PERL_UNUSED_ARG(cnt);
+#endif
if (!b->buf)
PerlIO_get_base(f);
b->ptr = ptr;
- if (PerlIO_get_cnt(f) != cnt || b->ptr < b->buf) {
- assert(PerlIO_get_cnt(f) == cnt);
- assert(b->ptr >= b->buf);
- }
+ assert(PerlIO_get_cnt(f) == cnt);
+ assert(b->ptr >= b->buf);
PerlIOBase(f)->flags |= PERLIO_F_RDBUF;
}
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;
PerlIO_vprintf(PerlIO *f, const char *fmt, va_list ap)
{
dTHX;
- SV * const sv = newSVpvs("");
+ SV * sv;
const char *s;
STRLEN len;
SSize_t wrote;
#ifdef NEED_VA_COPY
va_list apc;
Perl_va_copy(ap, apc);
- sv_vcatpvf(sv, fmt, &apc);
+ sv = vnewSVpvf(fmt, &apc);
#else
- sv_vcatpvf(sv, fmt, &ap);
+ sv = vnewSVpvf(fmt, &ap);
#endif
s = SvPV_const(sv, len);
wrote = PerlIO_write(f, s, len);
f = PerlIO_fdopen(fd, "w+b");
#else /* WIN32 */
# if defined(HAS_MKSTEMP) && ! defined(VMS) && ! defined(OS2)
- SV * const sv = newSVpvs("/tmp/PerlIO_XXXXXX");
+ int fd = -1;
+ char tempname[] = "/tmp/PerlIO_XXXXXX";
+ const char * const tmpdir = PL_tainting ? NULL : PerlEnv_getenv("TMPDIR");
+ SV * const sv = tmpdir && *tmpdir ? newSVpv(tmpdir, 0) : NULL;
/*
* I have no idea how portable mkstemp() is ... NI-S
*/
- const int fd = mkstemp(SvPVX(sv));
+ if (sv) {
+ /* if TMPDIR is set and not empty, we try that first */
+ sv_catpv(sv, tempname + 4);
+ fd = mkstemp(SvPVX(sv));
+ }
+ if (fd < 0) {
+ /* else we try /tmp */
+ fd = mkstemp(tempname);
+ }
if (fd >= 0) {
f = PerlIO_fdopen(fd, "w+");
if (f)
PerlIOBase(f)->flags |= PERLIO_F_TEMP;
- PerlLIO_unlink(SvPVX_const(sv));
- SvREFCNT_dec(sv);
+ PerlLIO_unlink(sv ? SvPVX_const(sv) : tempname);
}
+ if (sv)
+ SvREFCNT_dec(sv);
# else /* !HAS_MKSTEMP, fallback to stdio tmpfile(). */
FILE * const stdio = PerlSIO_tmpfile();
Perl_PerlIO_context_layers(pTHX_ const char *mode)
{
dVAR;
- const char *type = NULL;
+ const char *direction = NULL;
+ SV *layers;
/*
* Need to supply default layer info from open.pm
*/
- if (PL_curcop && PL_curcop->cop_hints & HINT_LEXICAL_IO) {
- SV * const layers
- = Perl_refcounted_he_fetch(aTHX_ PL_curcop->cop_hints_hash, 0,
- "open", 4, 0, 0);
- assert(layers);
- if (SvOK(layers)) {
- STRLEN len;
- type = SvPV_const(layers, len);
- if (type && mode && mode[0] != 'r') {
- /*
- * Skip to write part, which is separated by a '\0'
- */
- STRLEN read_len = strlen(type);
- if (read_len < len) {
- type += read_len + 1;
- }
- }
- }
+
+ if (!PL_curcop)
+ return NULL;
+
+ if (mode && mode[0] != 'r') {
+ if (PL_curcop->cop_hints & HINT_LEXICAL_IO_OUT)
+ direction = "open>";
+ } else {
+ if (PL_curcop->cop_hints & HINT_LEXICAL_IO_IN)
+ direction = "open<";
}
- return type;
+ if (!direction)
+ return NULL;
+
+ layers = Perl_refcounted_he_fetch(aTHX_ PL_curcop->cop_hints_hash,
+ 0, direction, 5, 0, 0);
+
+ assert(layers);
+ return SvOK(layers) ? SvPV_nolen_const(layers) : NULL;
}
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