forked from schacon/perl
/
pp_sys.c
5760 lines (5250 loc) · 131 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_WAIT
# include <sys/wait.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
#if defined(HAS_FCNTL) && defined(F_SETFD) && !defined(FD_CLOEXEC)
# define FD_CLOEXEC 1 /* NeXT needs this */
#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
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
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
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
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)
{
dVAR; 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)
{
dVAR;
OP *result;
tryAMAGICunTARGET(iter, -1);
/* 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 (PL_tainting) {
/*
* 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 = MUTABLE_GV(*PL_stack_sp--);
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)
{
dVAR;
PL_last_in_gv = cGVOP_gv;
return do_readline();
}
PP(pp_warn)
{
dVAR; dSP; dMARK;
SV *exsv;
const char *pv;
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 (SvROK(exsv) || (pv = SvPV_const(exsv, len), len)) {
/* well-formed exception supplied */
}
else if (SvROK(ERRSV)) {
exsv = ERRSV;
}
else if (SvPOK(ERRSV) && SvCUR(ERRSV)) {
exsv = sv_mortalcopy(ERRSV);
sv_catpvs(exsv, "\t...caught");
}
else {
exsv = newSVpvs_flags("Warning: something's wrong", SVs_TEMP);
}
warn_sv(exsv);
RETSETYES;
}
PP(pp_die)
{
dVAR; dSP; dMARK;
SV *exsv;
const char *pv;
STRLEN len;
#ifdef VMS
VMSISH_HUSHED = VMSISH_HUSHED || (PL_op->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) || (pv = SvPV_const(exsv, len), len)) {
/* well-formed exception supplied */
}
else 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);
}
return die_sv(exsv);
}
/* I/O. */
PP(pp_open)
{
dVAR; 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))) {
MAGIC *mg;
IoFLAGS(GvIOp(gv)) &= ~IOf_UNTAINT;
if (IoDIRP(io))
Perl_ck_warner_d(aTHX_ packWARN2(WARN_IO, WARN_DEPRECATED),
"Opening dirhandle %s also as a file",
GvENAME(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 */
*MARK-- = SvTIED_obj(MUTABLE_SV(io), mg);
PUSHMARK(MARK);
PUTBACK;
ENTER_with_name("call_OPEN");
call_method("OPEN", G_SCALAR);
LEAVE_with_name("call_OPEN");
SPAGAIN;
RETURN;
}
}
if (MARK < SP) {
sv = *++MARK;
}
else {
sv = GvSVn(gv);
}
tmps = SvPV_const(sv, len);
ok = do_openn(gv, tmps, len, FALSE, O_RDONLY, 0, 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;
}
/* These are private to this function, which is private to this file.
Use 0x04 rather than the next available bit, to help the compiler if the
architecture can generate more efficient instructions. */
#define MORTALIZE_NOT_NEEDED 0x04
#define TIED_HANDLE_ARGC_SHIFT 3
static OP *
S_tied_handle_method(pTHX_ const char *const methname, SV **sp,
IO *const io, MAGIC *const mg, const U32 flags, ...)
{
U32 argc = flags >> TIED_HANDLE_ARGC_SHIFT;
PERL_ARGS_ASSERT_TIED_HANDLE_METHOD;
/* Ensure that our flag bits do not overlap. */
assert((MORTALIZE_NOT_NEEDED & G_WANT) == 0);
assert((G_WANT >> TIED_HANDLE_ARGC_SHIFT) == 0);
PUSHMARK(sp);
PUSHs(SvTIED_obj(MUTABLE_SV(io), mg));
if (argc) {
const U32 mortalize_not_needed = flags & MORTALIZE_NOT_NEEDED;
va_list args;
va_start(args, flags);
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_handle_method");
call_method(methname, flags & G_WANT);
LEAVE_with_name("call_tied_handle_method");
return NORMAL;
}
#define tied_handle_method(a,b,c,d) \
S_tied_handle_method(aTHX_ a,b,c,d,G_SCALAR)
#define tied_handle_method1(a,b,c,d,e) \
S_tied_handle_method(aTHX_ a,b,c,d,G_SCALAR | (1 << TIED_HANDLE_ARGC_SHIFT),e)
#define tied_handle_method2(a,b,c,d,e,f) \
S_tied_handle_method(aTHX_ a,b,c,d,G_SCALAR | (2 << TIED_HANDLE_ARGC_SHIFT), e,f)
PP(pp_close)
{
dVAR; dSP;
GV * const gv = (MAXARG == 0) ? PL_defoutgv : MUTABLE_GV(POPs);
if (MAXARG == 0)
EXTEND(SP, 1);
if (gv) {
IO * const io = GvIO(gv);
if (io) {
MAGIC * const mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar);
if (mg) {
return tied_handle_method("CLOSE", SP, io, mg);
}
}
}
PUSHs(boolSV(do_close(gv, TRUE)));
RETURN;
}
PP(pp_pipe_op)
{
#ifdef HAS_PIPE
dVAR;
dSP;
register IO *rstio;
register IO *wstio;
int fd[2];
GV * const wgv = MUTABLE_GV(POPs);
GV * const rgv = MUTABLE_GV(POPs);
if (!rgv || !wgv)
goto badexit;
if (!isGV_with_GP(rgv) || !isGV_with_GP(wgv))
DIE(aTHX_ PL_no_usym, "filehandle");
rstio = GvIOn(rgv);
wstio = GvIOn(wgv);
if (IoIFP(rstio))
do_close(rgv, FALSE);
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)
fcntl(fd[0],F_SETFD,fd[0] > PL_maxsysfd); /* ensure close-on-exec */
fcntl(fd[1],F_SETFD,fd[1] > PL_maxsysfd); /* ensure close-on-exec */
#endif
RETPUSHYES;
badexit:
RETPUSHUNDEF;
#else
DIE(aTHX_ PL_no_func, "pipe");
#endif
}
PP(pp_fileno)
{
dVAR; dSP; dTARGET;
GV *gv;
IO *io;
PerlIO *fp;
MAGIC *mg;
if (MAXARG < 1)
RETPUSHUNDEF;
gv = MUTABLE_GV(POPs);
if (gv && (io = GvIO(gv))
&& (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
{
return tied_handle_method("FILENO", SP, io, mg);
}
if (!gv || !(io = GvIO(gv)) || !(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.
if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
report_evil_fh(gv, io, PL_op->op_type);
*/
RETPUSHUNDEF;
}
PUSHi(PerlIO_fileno(fp));
RETURN;
}
PP(pp_umask)
{
dVAR;
dSP;
#ifdef HAS_UMASK
dTARGET;
Mode_t anum;
if (MAXARG < 1) {
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 && (POPi & 0700))
DIE(aTHX_ "umask not implemented");
XPUSHs(&PL_sv_undef);
#endif
RETURN;
}
PP(pp_binmode)
{
dVAR; dSP;
GV *gv;
IO *io;
PerlIO *fp;
SV *discp = NULL;
if (MAXARG < 1)
RETPUSHUNDEF;
if (MAXARG > 1) {
discp = POPs;
}
gv = MUTABLE_GV(POPs);
if (gv && (io = GvIO(gv))) {
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 S_tied_handle_method(aTHX_ "BINMODE", SP, io, mg,
G_SCALAR|MORTALIZE_NOT_NEEDED
| (discp
? (1 << TIED_HANDLE_ARGC_SHIFT) : 0),
discp);
}
}
if (!(io = GvIO(gv)) || !(fp = IoIFP(io))) {
if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
report_evil_fh(gv, io, PL_op->op_type);
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)
{
dVAR; 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:
methname = "TIEHASH";
HvEITER_set(MUTABLE_HV(varsv), 0);
break;
case SVt_PVAV:
methname = "TIEARRAY";
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;
}
/* FALL THROUGH */
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.)
*/
STRLEN len;
const char *name = SvPV_nomg_const(*MARK, len);
stash = gv_stashpvn(name, len, 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;
}
PP(pp_untie)
{
dVAR; 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 ((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");
call_sv(MUTABLE_SV(cv), G_VOID);
LEAVE_with_name("call_UNTIE");
SPAGAIN;
}
else if (mg && SvREFCNT(obj) > 1) {
Perl_ck_warner(aTHX_ packWARN(WARN_UNTIE),
"untie attempted while %"UVuf" inner references still exist",
(UV)SvREFCNT(obj) - 1 ) ;
}
}
}
sv_unmagic(sv, how) ;
RETPUSHYES;
}
PP(pp_tied)
{
dVAR;
dSP;
const 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))))
RETPUSHUNDEF;
if ((mg = SvTIED_mg(sv, how))) {
SV *osv = SvTIED_obj(sv, mg);
if (osv == mg->mg_obj)
osv = sv_mortalcopy(osv);
PUSHs(osv);
RETURN;
}
RETPUSHUNDEF;
}
PP(pp_dbmopen)
{
dVAR; dSP;
dPOPPOPssrl;
HV* stash;
GV *gv = NULL;
HV * const hv = MUTABLE_HV(POPs);
SV * const sv = newSVpvs_flags("AnyDBM_File", SVs_TEMP);
stash = gv_stashsv(sv, 0);
if (!stash || !(gv = gv_fetchmethod(stash, "TIEHASH"))) {
PUTBACK;
require_pv("AnyDBM_File.pm");
SPAGAIN;
if (!stash || !(gv = gv_fetchmethod(stash, "TIEHASH")))
DIE(aTHX_ "No dbm on this machine");
}
ENTER;
PUSHMARK(SP);
EXTEND(SP, 5);
PUSHs(sv);
PUSHs(left);
if (SvIV(right))
mPUSHu(O_RDWR|O_CREAT);
else
mPUSHu(O_RDWR);
PUSHs(right);
PUTBACK;
call_sv(MUTABLE_SV(GvCV(gv)), G_SCALAR);
SPAGAIN;
if (!sv_isobject(TOPs)) {
SP--;
PUSHMARK(SP);
PUSHs(sv);
PUSHs(left);
mPUSHu(O_RDONLY);
PUSHs(right);
PUTBACK;
call_sv(MUTABLE_SV(GvCV(gv)), G_SCALAR);
SPAGAIN;
}