forked from schacon/perl
/
pp_sys.c
5750 lines (5198 loc) · 134 KB
/
pp_sys.c
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/* pp_sys.c
*
* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
* 2004, 2005, 2006, 2007, 2008 by 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.
*
*/
/*
* But only a short way ahead its floor and the walls on either side were
* cloven by a great fissure, out of which the red glare came, now leaping
* up, now dying down into darkness; and all the while far below there was
* a rumour and a trouble as of great engines throbbing and labouring.
*
* [p.945 of _The Lord of the Rings_, VI/iii: "Mount Doom"]
*/
/* This file contains system pp ("push/pop") functions that
* execute the opcodes that make up a perl program. A typical pp function
* expects to find its arguments on the stack, and usually pushes its
* results onto the stack, hence the 'pp' terminology. Each OP structure
* contains a pointer to the relevant pp_foo() function.
*
* By 'system', we mean ops which interact with the OS, such as pp_open().
*/
#include "EXTERN.h"
#define PERL_IN_PP_SYS_C
#include "perl.h"
#include "time64.h"
#include "time64.c"
#ifdef I_SHADOW
/* Shadow password support for solaris - pdo@cs.umd.edu
* Not just Solaris: at least HP-UX, IRIX, Linux.
* The API is from SysV.
*
* There are at least two more shadow interfaces,
* see the comments in pp_gpwent().
*
* --jhi */
# ifdef __hpux__
/* There is a MAXINT coming from <shadow.h> <- <hpsecurity.h> <- <values.h>
* and another MAXINT from "perl.h" <- <sys/param.h>. */
# undef MAXINT
# endif
# include <shadow.h>
#endif
#ifdef I_SYS_RESOURCE
# include <sys/resource.h>
#endif
#ifdef NETWARE
NETDB_DEFINE_CONTEXT
#endif
#ifdef HAS_SELECT
# ifdef I_SYS_SELECT
# include <sys/select.h>
# endif
#endif
/* XXX Configure test needed.
h_errno might not be a simple 'int', especially for multi-threaded
applications, see "extern int errno in perl.h". Creating such
a test requires taking into account the differences between
compiling multithreaded and singlethreaded ($ccflags et al).
HOST_NOT_FOUND is typically defined in <netdb.h>.
*/
#if defined(HOST_NOT_FOUND) && !defined(h_errno) && !defined(__CYGWIN__)
extern int h_errno;
#endif
#ifdef HAS_PASSWD
# ifdef I_PWD
# include <pwd.h>
# else
# if !defined(VMS)
struct passwd *getpwnam (char *);
struct passwd *getpwuid (Uid_t);
# endif
# endif
# ifdef HAS_GETPWENT
#ifndef getpwent
struct passwd *getpwent (void);
#elif defined (VMS) && defined (my_getpwent)
struct passwd *Perl_my_getpwent (pTHX);
#endif
# endif
#endif
#ifdef HAS_GROUP
# ifdef I_GRP
# include <grp.h>
# else
struct group *getgrnam (char *);
struct group *getgrgid (Gid_t);
# endif
# ifdef HAS_GETGRENT
#ifndef getgrent
struct group *getgrent (void);
#endif
# endif
#endif
#ifdef I_UTIME
# if defined(_MSC_VER) || defined(__MINGW32__)
# include <sys/utime.h>
# else
# include <utime.h>
# endif
#endif
#ifdef HAS_CHSIZE
# ifdef my_chsize /* Probably #defined to Perl_my_chsize in embed.h */
# undef my_chsize
# endif
# define my_chsize PerlLIO_chsize
#else
# ifdef HAS_TRUNCATE
# define my_chsize PerlLIO_chsize
# else
I32 my_chsize(int fd, Off_t length);
# endif
#endif
#ifdef HAS_FLOCK
# define FLOCK flock
#else /* no flock() */
/* fcntl.h might not have been included, even if it exists, because
the current Configure only sets I_FCNTL if it's needed to pick up
the *_OK constants. Make sure it has been included before testing
the fcntl() locking constants. */
# if defined(HAS_FCNTL) && !defined(I_FCNTL)
# include <fcntl.h>
# endif
# if defined(HAS_FCNTL) && defined(FCNTL_CAN_LOCK)
# define FLOCK fcntl_emulate_flock
# define FCNTL_EMULATE_FLOCK
# else /* no flock() or fcntl(F_SETLK,...) */
# ifdef HAS_LOCKF
# define FLOCK lockf_emulate_flock
# define LOCKF_EMULATE_FLOCK
# endif /* lockf */
# endif /* no flock() or fcntl(F_SETLK,...) */
# ifdef FLOCK
static int FLOCK (int, int);
/*
* These are the flock() constants. Since this sytems doesn't have
* flock(), the values of the constants are probably not available.
*/
# ifndef LOCK_SH
# define LOCK_SH 1
# endif
# ifndef LOCK_EX
# define LOCK_EX 2
# endif
# ifndef LOCK_NB
# define LOCK_NB 4
# endif
# ifndef LOCK_UN
# define LOCK_UN 8
# endif
# endif /* emulating flock() */
#endif /* no flock() */
#define ZBTLEN 10
static const char zero_but_true[ZBTLEN + 1] = "0 but true";
#if defined(I_SYS_ACCESS) && !defined(R_OK)
# include <sys/access.h>
#endif
#include "reentr.h"
#ifdef __Lynx__
/* Missing protos on LynxOS */
void sethostent(int);
void endhostent(void);
void setnetent(int);
void endnetent(void);
void setprotoent(int);
void endprotoent(void);
void setservent(int);
void endservent(void);
#endif
#undef PERL_EFF_ACCESS /* EFFective uid/gid ACCESS */
/* F_OK unused: if stat() cannot find it... */
#if !defined(PERL_EFF_ACCESS) && defined(HAS_ACCESS) && defined(EFF_ONLY_OK) && !defined(NO_EFF_ONLY_OK)
/* Digital UNIX (when the EFF_ONLY_OK gets fixed), UnixWare */
# define PERL_EFF_ACCESS(p,f) (access((p), (f) | EFF_ONLY_OK))
#endif
#if !defined(PERL_EFF_ACCESS) && defined(HAS_EACCESS)
# ifdef I_SYS_SECURITY
# include <sys/security.h>
# endif
# ifdef ACC_SELF
/* HP SecureWare */
# define PERL_EFF_ACCESS(p,f) (eaccess((p), (f), ACC_SELF))
# else
/* SCO */
# define PERL_EFF_ACCESS(p,f) (eaccess((p), (f)))
# endif
#endif
#if !defined(PERL_EFF_ACCESS) && defined(HAS_ACCESSX) && defined(ACC_SELF)
/* AIX */
# define PERL_EFF_ACCESS(p,f) (accessx((p), (f), ACC_SELF))
#endif
#if !defined(PERL_EFF_ACCESS) && defined(HAS_ACCESS) \
&& (defined(HAS_SETREUID) || defined(HAS_SETRESUID) \
|| defined(HAS_SETREGID) || defined(HAS_SETRESGID))
/* The Hard Way. */
STATIC int
S_emulate_eaccess(pTHX_ const char* path, Mode_t mode)
{
const Uid_t ruid = getuid();
const Uid_t euid = geteuid();
const Gid_t rgid = getgid();
const Gid_t egid = getegid();
int res;
#if !defined(HAS_SETREUID) && !defined(HAS_SETRESUID)
Perl_croak(aTHX_ "switching effective uid is not implemented");
#else
#ifdef HAS_SETREUID
if (setreuid(euid, ruid))
#else
#ifdef HAS_SETRESUID
if (setresuid(euid, ruid, (Uid_t)-1))
#endif
#endif
/* diag_listed_as: entering effective %s failed */
Perl_croak(aTHX_ "entering effective uid failed");
#endif
#if !defined(HAS_SETREGID) && !defined(HAS_SETRESGID)
Perl_croak(aTHX_ "switching effective gid is not implemented");
#else
#ifdef HAS_SETREGID
if (setregid(egid, rgid))
#else
#ifdef HAS_SETRESGID
if (setresgid(egid, rgid, (Gid_t)-1))
#endif
#endif
/* diag_listed_as: entering effective %s failed */
Perl_croak(aTHX_ "entering effective gid failed");
#endif
res = access(path, mode);
#ifdef HAS_SETREUID
if (setreuid(ruid, euid))
#else
#ifdef HAS_SETRESUID
if (setresuid(ruid, euid, (Uid_t)-1))
#endif
#endif
/* diag_listed_as: leaving effective %s failed */
Perl_croak(aTHX_ "leaving effective uid failed");
#ifdef HAS_SETREGID
if (setregid(rgid, egid))
#else
#ifdef HAS_SETRESGID
if (setresgid(rgid, egid, (Gid_t)-1))
#endif
#endif
/* diag_listed_as: leaving effective %s failed */
Perl_croak(aTHX_ "leaving effective gid failed");
return res;
}
# define PERL_EFF_ACCESS(p,f) (S_emulate_eaccess(aTHX_ (p), (f)))
#endif
PP(pp_backtick)
{
dSP; dTARGET;
PerlIO *fp;
const char * const tmps = POPpconstx;
const I32 gimme = GIMME_V;
const char *mode = "r";
TAINT_PROPER("``");
if (PL_op->op_private & OPpOPEN_IN_RAW)
mode = "rb";
else if (PL_op->op_private & OPpOPEN_IN_CRLF)
mode = "rt";
fp = PerlProc_popen(tmps, mode);
if (fp) {
const char * const type = Perl_PerlIO_context_layers(aTHX_ NULL);
if (type && *type)
PerlIO_apply_layers(aTHX_ fp,mode,type);
if (gimme == G_VOID) {
char tmpbuf[256];
while (PerlIO_read(fp, tmpbuf, sizeof tmpbuf) > 0)
NOOP;
}
else if (gimme == G_SCALAR) {
ENTER_with_name("backtick");
SAVESPTR(PL_rs);
PL_rs = &PL_sv_undef;
sv_setpvs(TARG, ""); /* note that this preserves previous buffer */
while (sv_gets(TARG, fp, SvCUR(TARG)) != NULL)
NOOP;
LEAVE_with_name("backtick");
XPUSHs(TARG);
SvTAINTED_on(TARG);
}
else {
for (;;) {
SV * const sv = newSV(79);
if (sv_gets(sv, fp, 0) == NULL) {
SvREFCNT_dec(sv);
break;
}
mXPUSHs(sv);
if (SvLEN(sv) - SvCUR(sv) > 20) {
SvPV_shrink_to_cur(sv);
}
SvTAINTED_on(sv);
}
}
STATUS_NATIVE_CHILD_SET(PerlProc_pclose(fp));
TAINT; /* "I believe that this is not gratuitous!" */
}
else {
STATUS_NATIVE_CHILD_SET(-1);
if (gimme == G_SCALAR)
RETPUSHUNDEF;
}
RETURN;
}
PP(pp_glob)
{
OP *result;
dSP;
GV * const gv = (PL_op->op_flags & OPf_SPECIAL) ? NULL : (GV *)POPs;
PUTBACK;
/* make a copy of the pattern if it is gmagical, to ensure that magic
* is called once and only once */
if (SvGMAGICAL(TOPs)) TOPs = sv_2mortal(newSVsv(TOPs));
tryAMAGICunTARGETlist(iter_amg, (PL_op->op_flags & OPf_SPECIAL));
if (PL_op->op_flags & OPf_SPECIAL) {
/* call Perl-level glob function instead. Stack args are:
* MARK, wildcard
* and following OPs should be: gv(CORE::GLOBAL::glob), entersub
* */
return NORMAL;
}
if (PL_globhook) {
PL_globhook(aTHX);
return NORMAL;
}
/* Note that we only ever get here if File::Glob fails to load
* without at the same time croaking, for some reason, or if
* perl was built with PERL_EXTERNAL_GLOB */
ENTER_with_name("glob");
#ifndef VMS
if (TAINTING_get) {
/*
* The external globbing program may use things we can't control,
* so for security reasons we must assume the worst.
*/
TAINT;
taint_proper(PL_no_security, "glob");
}
#endif /* !VMS */
SAVESPTR(PL_last_in_gv); /* We don't want this to be permanent. */
PL_last_in_gv = gv;
SAVESPTR(PL_rs); /* This is not permanent, either. */
PL_rs = newSVpvs_flags("\000", SVs_TEMP);
#ifndef DOSISH
#ifndef CSH
*SvPVX(PL_rs) = '\n';
#endif /* !CSH */
#endif /* !DOSISH */
result = do_readline();
LEAVE_with_name("glob");
return result;
}
PP(pp_rcatline)
{
PL_last_in_gv = cGVOP_gv;
return do_readline();
}
PP(pp_warn)
{
dSP; dMARK;
SV *exsv;
STRLEN len;
if (SP - MARK > 1) {
dTARGET;
do_join(TARG, &PL_sv_no, MARK, SP);
exsv = TARG;
SP = MARK + 1;
}
else if (SP == MARK) {
exsv = &PL_sv_no;
EXTEND(SP, 1);
SP = MARK + 1;
}
else {
exsv = TOPs;
if (SvGMAGICAL(exsv)) exsv = sv_mortalcopy(exsv);
}
if (SvROK(exsv) || (SvPV_const(exsv, len), len)) {
/* well-formed exception supplied */
}
else {
SV * const errsv = ERRSV;
SvGETMAGIC(errsv);
if (SvROK(errsv)) {
if (SvGMAGICAL(errsv)) {
exsv = sv_newmortal();
sv_setsv_nomg(exsv, errsv);
}
else exsv = errsv;
}
else if (SvPOKp(errsv) ? SvCUR(errsv) : SvNIOKp(errsv)) {
exsv = sv_newmortal();
sv_setsv_nomg(exsv, errsv);
sv_catpvs(exsv, "\t...caught");
}
else {
exsv = newSVpvs_flags("Warning: something's wrong", SVs_TEMP);
}
}
if (SvROK(exsv) && !PL_warnhook)
Perl_warn(aTHX_ "%"SVf, SVfARG(exsv));
else warn_sv(exsv);
RETSETYES;
}
PP(pp_die)
{
dSP; dMARK;
SV *exsv;
STRLEN len;
#ifdef VMS
VMSISH_HUSHED =
VMSISH_HUSHED || (PL_curcop->op_private & OPpHUSH_VMSISH);
#endif
if (SP - MARK != 1) {
dTARGET;
do_join(TARG, &PL_sv_no, MARK, SP);
exsv = TARG;
SP = MARK + 1;
}
else {
exsv = TOPs;
}
if (SvROK(exsv) || (SvPV_const(exsv, len), len)) {
/* well-formed exception supplied */
}
else {
SV * const errsv = ERRSV;
SvGETMAGIC(errsv);
if (SvROK(errsv)) {
exsv = errsv;
if (sv_isobject(exsv)) {
HV * const stash = SvSTASH(SvRV(exsv));
GV * const gv = gv_fetchmethod(stash, "PROPAGATE");
if (gv) {
SV * const file = sv_2mortal(newSVpv(CopFILE(PL_curcop),0));
SV * const line = sv_2mortal(newSVuv(CopLINE(PL_curcop)));
EXTEND(SP, 3);
PUSHMARK(SP);
PUSHs(exsv);
PUSHs(file);
PUSHs(line);
PUTBACK;
call_sv(MUTABLE_SV(GvCV(gv)),
G_SCALAR|G_EVAL|G_KEEPERR);
exsv = sv_mortalcopy(*PL_stack_sp--);
}
}
}
else if (SvPOK(errsv) && SvCUR(errsv)) {
exsv = sv_mortalcopy(errsv);
sv_catpvs(exsv, "\t...propagated");
}
else {
exsv = newSVpvs_flags("Died", SVs_TEMP);
}
}
die_sv(exsv);
NOT_REACHED; /* NOTREACHED */
return NULL; /* avoid missing return from non-void function warning */
}
/* I/O. */
OP *
Perl_tied_method(pTHX_ SV *methname, SV **sp, SV *const sv,
const MAGIC *const mg, const U32 flags, U32 argc, ...)
{
SV **orig_sp = sp;
I32 ret_args;
PERL_ARGS_ASSERT_TIED_METHOD;
/* Ensure that our flag bits do not overlap. */
STATIC_ASSERT_STMT((TIED_METHOD_MORTALIZE_NOT_NEEDED & G_WANT) == 0);
STATIC_ASSERT_STMT((TIED_METHOD_ARGUMENTS_ON_STACK & G_WANT) == 0);
STATIC_ASSERT_STMT((TIED_METHOD_SAY & G_WANT) == 0);
PUTBACK; /* sp is at *foot* of args, so this pops args from old stack */
PUSHSTACKi(PERLSI_MAGIC);
EXTEND(SP, argc+1); /* object + args */
PUSHMARK(sp);
PUSHs(SvTIED_obj(sv, mg));
if (flags & TIED_METHOD_ARGUMENTS_ON_STACK) {
Copy(orig_sp + 2, sp + 1, argc, SV*); /* copy args to new stack */
sp += argc;
}
else if (argc) {
const U32 mortalize_not_needed
= flags & TIED_METHOD_MORTALIZE_NOT_NEEDED;
va_list args;
va_start(args, argc);
do {
SV *const arg = va_arg(args, SV *);
if(mortalize_not_needed)
PUSHs(arg);
else
mPUSHs(arg);
} while (--argc);
va_end(args);
}
PUTBACK;
ENTER_with_name("call_tied_method");
if (flags & TIED_METHOD_SAY) {
/* local $\ = "\n" */
SAVEGENERICSV(PL_ors_sv);
PL_ors_sv = newSVpvs("\n");
}
ret_args = call_sv(methname, (flags & G_WANT)|G_METHOD_NAMED);
SPAGAIN;
orig_sp = sp;
POPSTACK;
SPAGAIN;
if (ret_args) { /* copy results back to original stack */
EXTEND(sp, ret_args);
Copy(orig_sp - ret_args + 1, sp + 1, ret_args, SV*);
sp += ret_args;
PUTBACK;
}
LEAVE_with_name("call_tied_method");
return NORMAL;
}
#define tied_method0(a,b,c,d) \
Perl_tied_method(aTHX_ a,b,c,d,G_SCALAR,0)
#define tied_method1(a,b,c,d,e) \
Perl_tied_method(aTHX_ a,b,c,d,G_SCALAR,1,e)
#define tied_method2(a,b,c,d,e,f) \
Perl_tied_method(aTHX_ a,b,c,d,G_SCALAR,2,e,f)
PP(pp_open)
{
dSP;
dMARK; dORIGMARK;
dTARGET;
SV *sv;
IO *io;
const char *tmps;
STRLEN len;
bool ok;
GV * const gv = MUTABLE_GV(*++MARK);
if (!isGV(gv) && !(SvTYPE(gv) == SVt_PVLV && isGV_with_GP(gv)))
DIE(aTHX_ PL_no_usym, "filehandle");
if ((io = GvIOp(gv))) {
const MAGIC *mg;
IoFLAGS(GvIOp(gv)) &= ~IOf_UNTAINT;
if (IoDIRP(io))
Perl_ck_warner_d(aTHX_ packWARN2(WARN_IO, WARN_DEPRECATED),
"Opening dirhandle %"HEKf" also as a file",
HEKfARG(GvENAME_HEK(gv)));
mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar);
if (mg) {
/* Method's args are same as ours ... */
/* ... except handle is replaced by the object */
return Perl_tied_method(aTHX_ SV_CONST(OPEN), mark - 1, MUTABLE_SV(io), mg,
G_SCALAR | TIED_METHOD_ARGUMENTS_ON_STACK,
sp - mark);
}
}
if (MARK < SP) {
sv = *++MARK;
}
else {
sv = GvSVn(gv);
}
tmps = SvPV_const(sv, len);
ok = do_open6(gv, tmps, len, NULL, MARK+1, (SP-MARK));
SP = ORIGMARK;
if (ok)
PUSHi( (I32)PL_forkprocess );
else if (PL_forkprocess == 0) /* we are a new child */
PUSHi(0);
else
RETPUSHUNDEF;
RETURN;
}
PP(pp_close)
{
dSP;
GV * const gv =
MAXARG == 0 || (!TOPs && !POPs) ? PL_defoutgv : MUTABLE_GV(POPs);
if (MAXARG == 0)
EXTEND(SP, 1);
if (gv) {
IO * const io = GvIO(gv);
if (io) {
const MAGIC * const mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar);
if (mg) {
return tied_method0(SV_CONST(CLOSE), SP, MUTABLE_SV(io), mg);
}
}
}
PUSHs(boolSV(do_close(gv, TRUE)));
RETURN;
}
PP(pp_pipe_op)
{
#ifdef HAS_PIPE
dSP;
IO *rstio;
IO *wstio;
int fd[2];
GV * const wgv = MUTABLE_GV(POPs);
GV * const rgv = MUTABLE_GV(POPs);
assert (isGV_with_GP(rgv));
assert (isGV_with_GP(wgv));
rstio = GvIOn(rgv);
if (IoIFP(rstio))
do_close(rgv, FALSE);
wstio = GvIOn(wgv);
if (IoIFP(wstio))
do_close(wgv, FALSE);
if (PerlProc_pipe(fd) < 0)
goto badexit;
IoIFP(rstio) = PerlIO_fdopen(fd[0], "r"PIPE_OPEN_MODE);
IoOFP(wstio) = PerlIO_fdopen(fd[1], "w"PIPE_OPEN_MODE);
IoOFP(rstio) = IoIFP(rstio);
IoIFP(wstio) = IoOFP(wstio);
IoTYPE(rstio) = IoTYPE_RDONLY;
IoTYPE(wstio) = IoTYPE_WRONLY;
if (!IoIFP(rstio) || !IoOFP(wstio)) {
if (IoIFP(rstio))
PerlIO_close(IoIFP(rstio));
else
PerlLIO_close(fd[0]);
if (IoOFP(wstio))
PerlIO_close(IoOFP(wstio));
else
PerlLIO_close(fd[1]);
goto badexit;
}
#if defined(HAS_FCNTL) && defined(F_SETFD)
/* ensure close-on-exec */
if ((fcntl(fd[0], F_SETFD,fd[0] > PL_maxsysfd) < 0) ||
(fcntl(fd[1], F_SETFD,fd[1] > PL_maxsysfd) < 0))
goto badexit;
#endif
RETPUSHYES;
badexit:
RETPUSHUNDEF;
#else
DIE(aTHX_ PL_no_func, "pipe");
#endif
}
PP(pp_fileno)
{
dSP; dTARGET;
GV *gv;
IO *io;
PerlIO *fp;
const MAGIC *mg;
if (MAXARG < 1)
RETPUSHUNDEF;
gv = MUTABLE_GV(POPs);
io = GvIO(gv);
if (io
&& (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
{
return tied_method0(SV_CONST(FILENO), SP, MUTABLE_SV(io), mg);
}
if (io && IoDIRP(io)) {
#if defined(HAS_DIRFD) || defined(HAS_DIR_DD_FD)
PUSHi(my_dirfd(IoDIRP(io)));
RETURN;
#elif defined(ENOTSUP)
errno = ENOTSUP; /* Operation not supported */
RETPUSHUNDEF;
#elif defined(EOPNOTSUPP)
errno = EOPNOTSUPP; /* Operation not supported on socket */
RETPUSHUNDEF;
#else
errno = EINVAL; /* Invalid argument */
RETPUSHUNDEF;
#endif
}
if (!io || !(fp = IoIFP(io))) {
/* Can't do this because people seem to do things like
defined(fileno($foo)) to check whether $foo is a valid fh.
report_evil_fh(gv);
*/
RETPUSHUNDEF;
}
PUSHi(PerlIO_fileno(fp));
RETURN;
}
PP(pp_umask)
{
dSP;
#ifdef HAS_UMASK
dTARGET;
Mode_t anum;
if (MAXARG < 1 || (!TOPs && !POPs)) {
anum = PerlLIO_umask(022);
/* setting it to 022 between the two calls to umask avoids
* to have a window where the umask is set to 0 -- meaning
* that another thread could create world-writeable files. */
if (anum != 022)
(void)PerlLIO_umask(anum);
}
else
anum = PerlLIO_umask(POPi);
TAINT_PROPER("umask");
XPUSHi(anum);
#else
/* Only DIE if trying to restrict permissions on "user" (self).
* Otherwise it's harmless and more useful to just return undef
* since 'group' and 'other' concepts probably don't exist here. */
if (MAXARG >= 1 && (TOPs||POPs) && (POPi & 0700))
DIE(aTHX_ "umask not implemented");
XPUSHs(&PL_sv_undef);
#endif
RETURN;
}
PP(pp_binmode)
{
dSP;
GV *gv;
IO *io;
PerlIO *fp;
SV *discp = NULL;
if (MAXARG < 1)
RETPUSHUNDEF;
if (MAXARG > 1) {
discp = POPs;
}
gv = MUTABLE_GV(POPs);
io = GvIO(gv);
if (io) {
const MAGIC * const mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar);
if (mg) {
/* This takes advantage of the implementation of the varargs
function, which I don't think that the optimiser will be able to
figure out. Although, as it's a static function, in theory it
could. */
return Perl_tied_method(aTHX_ SV_CONST(BINMODE), SP, MUTABLE_SV(io), mg,
G_SCALAR|TIED_METHOD_MORTALIZE_NOT_NEEDED,
discp ? 1 : 0, discp);
}
}
if (!io || !(fp = IoIFP(io))) {
report_evil_fh(gv);
SETERRNO(EBADF,RMS_IFI);
RETPUSHUNDEF;
}
PUTBACK;
{
STRLEN len = 0;
const char *d = NULL;
int mode;
if (discp)
d = SvPV_const(discp, len);
mode = mode_from_discipline(d, len);
if (PerlIO_binmode(aTHX_ fp, IoTYPE(io), mode, d)) {
if (IoOFP(io) && IoOFP(io) != IoIFP(io)) {
if (!PerlIO_binmode(aTHX_ IoOFP(io), IoTYPE(io), mode, d)) {
SPAGAIN;
RETPUSHUNDEF;
}
}
SPAGAIN;
RETPUSHYES;
}
else {
SPAGAIN;
RETPUSHUNDEF;
}
}
}
PP(pp_tie)
{
dSP; dMARK;
HV* stash;
GV *gv = NULL;
SV *sv;
const I32 markoff = MARK - PL_stack_base;
const char *methname;
int how = PERL_MAGIC_tied;
U32 items;
SV *varsv = *++MARK;
switch(SvTYPE(varsv)) {
case SVt_PVHV:
{
HE *entry;
methname = "TIEHASH";
if (HvLAZYDEL(varsv) && (entry = HvEITER((HV *)varsv))) {
HvLAZYDEL_off(varsv);
hv_free_ent((HV *)varsv, entry);
}
HvEITER_set(MUTABLE_HV(varsv), 0);
break;
}
case SVt_PVAV:
methname = "TIEARRAY";
if (!AvREAL(varsv)) {
if (!AvREIFY(varsv))
Perl_croak(aTHX_ "Cannot tie unreifiable array");
av_clear((AV *)varsv);
AvREIFY_off(varsv);
AvREAL_on(varsv);
}
break;
case SVt_PVGV:
case SVt_PVLV:
if (isGV_with_GP(varsv) && !SvFAKE(varsv)) {
methname = "TIEHANDLE";
how = PERL_MAGIC_tiedscalar;
/* For tied filehandles, we apply tiedscalar magic to the IO
slot of the GP rather than the GV itself. AMS 20010812 */
if (!GvIOp(varsv))
GvIOp(varsv) = newIO();
varsv = MUTABLE_SV(GvIOp(varsv));
break;
}
if (SvTYPE(varsv) == SVt_PVLV && LvTYPE(varsv) == 'y') {
vivify_defelem(varsv);
varsv = LvTARG(varsv);
}
/* FALLTHROUGH */
default:
methname = "TIESCALAR";
how = PERL_MAGIC_tiedscalar;
break;
}
items = SP - MARK++;
if (sv_isobject(*MARK)) { /* Calls GET magic. */
ENTER_with_name("call_TIE");
PUSHSTACKi(PERLSI_MAGIC);
PUSHMARK(SP);
EXTEND(SP,(I32)items);
while (items--)
PUSHs(*MARK++);
PUTBACK;
call_method(methname, G_SCALAR);
}
else {
/* Can't use call_method here, else this: fileno FOO; tie @a, "FOO"
* will attempt to invoke IO::File::TIEARRAY, with (best case) the
* wrong error message, and worse case, supreme action at a distance.
* (Sorry obfuscation writers. You're not going to be given this one.)
*/
stash = gv_stashsv(*MARK, 0);
if (!stash || !(gv = gv_fetchmethod(stash, methname))) {
DIE(aTHX_ "Can't locate object method \"%s\" via package \"%"SVf"\"",
methname, SVfARG(SvOK(*MARK) ? *MARK : &PL_sv_no));
}
ENTER_with_name("call_TIE");
PUSHSTACKi(PERLSI_MAGIC);
PUSHMARK(SP);
EXTEND(SP,(I32)items);
while (items--)
PUSHs(*MARK++);
PUTBACK;
call_sv(MUTABLE_SV(GvCV(gv)), G_SCALAR);
}
SPAGAIN;
sv = TOPs;
POPSTACK;
if (sv_isobject(sv)) {
sv_unmagic(varsv, how);
/* Croak if a self-tie on an aggregate is attempted. */
if (varsv == SvRV(sv) &&
(SvTYPE(varsv) == SVt_PVAV ||
SvTYPE(varsv) == SVt_PVHV))
Perl_croak(aTHX_
"Self-ties of arrays and hashes are not supported");
sv_magic(varsv, (SvRV(sv) == varsv ? NULL : sv), how, NULL, 0);
}
LEAVE_with_name("call_TIE");
SP = PL_stack_base + markoff;
PUSHs(sv);
RETURN;
}
/* also used for: pp_dbmclose() */
PP(pp_untie)
{
dSP;
MAGIC *mg;
SV *sv = POPs;
const char how = (SvTYPE(sv) == SVt_PVHV || SvTYPE(sv) == SVt_PVAV)
? PERL_MAGIC_tied : PERL_MAGIC_tiedscalar;
if (isGV_with_GP(sv) && !SvFAKE(sv) && !(sv = MUTABLE_SV(GvIOp(sv))))
RETPUSHYES;
if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y' &&
!(sv = defelem_target(sv, NULL))) RETPUSHUNDEF;
if ((mg = SvTIED_mg(sv, how))) {
SV * const obj = SvRV(SvTIED_obj(sv, mg));
if (obj) {
GV * const gv = gv_fetchmethod_autoload(SvSTASH(obj), "UNTIE", FALSE);
CV *cv;
if (gv && isGV(gv) && (cv = GvCV(gv))) {
PUSHMARK(SP);
PUSHs(SvTIED_obj(MUTABLE_SV(gv), mg));
mXPUSHi(SvREFCNT(obj) - 1);
PUTBACK;
ENTER_with_name("call_UNTIE");