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doio.c
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doio.c
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/* doio.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 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.
*
*/
/*
* Far below them they saw the white waters pour into a foaming bowl, and
* then swirl darkly about a deep oval basin in the rocks, until they found
* their way out again through a narrow gate, and flowed away, fuming and
* chattering, into calmer and more level reaches.
*
* [p.684 of _The Lord of the Rings_, IV/vi: "The Forbidden Pool"]
*/
/* This file contains functions that do the actual I/O on behalf of ops.
* For example, pp_print() calls the do_print() function in this file for
* each argument needing printing.
*/
#include "EXTERN.h"
#define PERL_IN_DOIO_C
#include "perl.h"
#if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM)
#ifndef HAS_SEM
#include <sys/ipc.h>
#endif
#ifdef HAS_MSG
#include <sys/msg.h>
#endif
#ifdef HAS_SHM
#include <sys/shm.h>
# ifndef HAS_SHMAT_PROTOTYPE
extern Shmat_t shmat (int, char *, int);
# endif
#endif
#endif
#ifdef I_UTIME
# if defined(_MSC_VER) || defined(__MINGW32__)
# include <sys/utime.h>
# else
# include <utime.h>
# endif
#endif
#ifdef O_EXCL
# define OPEN_EXCL O_EXCL
#else
# define OPEN_EXCL 0
#endif
#define PERL_MODE_MAX 8
#define PERL_FLAGS_MAX 10
#include <signal.h>
void
Perl_setfd_cloexec(int fd)
{
assert(fd >= 0);
#if defined(HAS_FCNTL) && defined(F_SETFD) && defined(FD_CLOEXEC)
(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
}
void
Perl_setfd_inhexec(int fd)
{
assert(fd >= 0);
#if defined(HAS_FCNTL) && defined(F_SETFD) && defined(FD_CLOEXEC)
(void) fcntl(fd, F_SETFD, 0);
#endif
}
void
Perl_setfd_cloexec_for_nonsysfd(pTHX_ int fd)
{
assert(fd >= 0);
if(fd > PL_maxsysfd)
setfd_cloexec(fd);
}
void
Perl_setfd_inhexec_for_sysfd(pTHX_ int fd)
{
assert(fd >= 0);
if(fd <= PL_maxsysfd)
setfd_inhexec(fd);
}
void
Perl_setfd_cloexec_or_inhexec_by_sysfdness(pTHX_ int fd)
{
assert(fd >= 0);
if(fd <= PL_maxsysfd)
setfd_inhexec(fd);
else
setfd_cloexec(fd);
}
#define DO_GENOPEN_THEN_CLOEXEC(GENOPEN_NORMAL, GENSETFD_CLOEXEC) \
do { \
int res = (GENOPEN_NORMAL); \
if(LIKELY(res != -1)) GENSETFD_CLOEXEC; \
return res; \
} while(0)
#if defined(HAS_FCNTL) && defined(F_SETFD) && defined(FD_CLOEXEC) && \
defined(F_GETFD)
enum { CLOEXEC_EXPERIMENT = 0, CLOEXEC_AT_OPEN, CLOEXEC_AFTER_OPEN };
# define DO_GENOPEN_EXPERIMENTING_CLOEXEC(strategy, TESTFD, GENOPEN_CLOEXEC, \
GENOPEN_NORMAL, GENSETFD_CLOEXEC) \
do { \
switch (strategy) { \
case CLOEXEC_EXPERIMENT: default: { \
int res = (GENOPEN_CLOEXEC), eno; \
if (LIKELY(res != -1)) { \
int fdflags = fcntl((TESTFD), F_GETFD); \
if (LIKELY(fdflags != -1) && \
LIKELY(fdflags & FD_CLOEXEC)) { \
strategy = CLOEXEC_AT_OPEN; \
} else { \
strategy = CLOEXEC_AFTER_OPEN; \
GENSETFD_CLOEXEC; \
} \
} else if (UNLIKELY((eno = errno) == EINVAL || \
eno == ENOSYS)) { \
res = (GENOPEN_NORMAL); \
if (LIKELY(res != -1)) { \
strategy = CLOEXEC_AFTER_OPEN; \
GENSETFD_CLOEXEC; \
} else if (!LIKELY((eno = errno) == EINVAL || \
eno == ENOSYS)) { \
strategy = CLOEXEC_AFTER_OPEN; \
} \
} \
return res; \
} \
case CLOEXEC_AT_OPEN: \
return (GENOPEN_CLOEXEC); \
case CLOEXEC_AFTER_OPEN: \
DO_GENOPEN_THEN_CLOEXEC(GENOPEN_NORMAL, GENSETFD_CLOEXEC); \
} \
} while(0)
#else
# define DO_GENOPEN_EXPERIMENTING_CLOEXEC(strategy, TESTFD, GENOPEN_CLOEXEC, \
GENOPEN_NORMAL, GENSETFD_CLOEXEC) \
DO_GENOPEN_THEN_CLOEXEC(GENOPEN_NORMAL, GENSETFD_CLOEXEC)
#endif
#define DO_ONEOPEN_THEN_CLOEXEC(ONEOPEN_NORMAL) \
do { \
int fd; \
DO_GENOPEN_THEN_CLOEXEC(fd = (ONEOPEN_NORMAL), \
setfd_cloexec(fd)); \
} while(0)
#define DO_ONEOPEN_EXPERIMENTING_CLOEXEC(strategy, \
ONEOPEN_CLOEXEC, ONEOPEN_NORMAL) \
do { \
int fd; \
DO_GENOPEN_EXPERIMENTING_CLOEXEC(strategy, \
fd, \
fd = (ONEOPEN_CLOEXEC), \
fd = (ONEOPEN_NORMAL), setfd_cloexec(fd)); \
} while(0)
#define DO_PIPESETFD_CLOEXEC(PIPEFD) \
do { \
setfd_cloexec((PIPEFD)[0]); \
setfd_cloexec((PIPEFD)[1]); \
} while(0)
#define DO_PIPEOPEN_THEN_CLOEXEC(PIPEFD, PIPEOPEN_NORMAL) \
DO_GENOPEN_THEN_CLOEXEC(PIPEOPEN_NORMAL, DO_PIPESETFD_CLOEXEC(PIPEFD))
#define DO_PIPEOPEN_EXPERIMENTING_CLOEXEC(strategy, PIPEFD, PIPEOPEN_CLOEXEC, \
PIPEOPEN_NORMAL) \
DO_GENOPEN_EXPERIMENTING_CLOEXEC(strategy, \
(PIPEFD)[0], PIPEOPEN_CLOEXEC, \
PIPEOPEN_NORMAL, DO_PIPESETFD_CLOEXEC(PIPEFD))
int
Perl_PerlLIO_dup_cloexec(pTHX_ int oldfd)
{
#if !defined(PERL_IMPLICIT_SYS) && defined(F_DUPFD_CLOEXEC)
/*
* struct IPerlLIO doesn't cover fcntl(), and there's no clear way
* to extend it, so for the time being this just isn't available on
* PERL_IMPLICIT_SYS builds.
*/
dVAR;
DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
PL_strategy_dup,
fcntl(oldfd, F_DUPFD_CLOEXEC, 0),
PerlLIO_dup(oldfd));
#else
DO_ONEOPEN_THEN_CLOEXEC(PerlLIO_dup(oldfd));
#endif
}
int
Perl_PerlLIO_dup2_cloexec(pTHX_ int oldfd, int newfd)
{
#if !defined(PERL_IMPLICIT_SYS) && defined(HAS_DUP3) && defined(O_CLOEXEC)
/*
* struct IPerlLIO doesn't cover dup3(), and there's no clear way
* to extend it, so for the time being this just isn't available on
* PERL_IMPLICIT_SYS builds.
*/
dVAR;
DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
PL_strategy_dup2,
dup3(oldfd, newfd, O_CLOEXEC),
PerlLIO_dup2(oldfd, newfd));
#else
DO_ONEOPEN_THEN_CLOEXEC(PerlLIO_dup2(oldfd, newfd));
#endif
}
int
Perl_PerlLIO_open_cloexec(pTHX_ const char *file, int flag)
{
dVAR;
PERL_ARGS_ASSERT_PERLLIO_OPEN_CLOEXEC;
#if defined(O_CLOEXEC)
DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
PL_strategy_open,
PerlLIO_open(file, flag | O_CLOEXEC),
PerlLIO_open(file, flag));
#else
DO_ONEOPEN_THEN_CLOEXEC(PerlLIO_open(file, flag));
#endif
}
int
Perl_PerlLIO_open3_cloexec(pTHX_ const char *file, int flag, int perm)
{
dVAR;
PERL_ARGS_ASSERT_PERLLIO_OPEN3_CLOEXEC;
#if defined(O_CLOEXEC)
DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
PL_strategy_open3,
PerlLIO_open3(file, flag | O_CLOEXEC, perm),
PerlLIO_open3(file, flag, perm));
#else
DO_ONEOPEN_THEN_CLOEXEC(PerlLIO_open3(file, flag, perm));
#endif
}
int
Perl_my_mkstemp_cloexec(char *templte)
{
dVAR;
PERL_ARGS_ASSERT_MY_MKSTEMP_CLOEXEC;
#if defined(O_CLOEXEC)
DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
PL_strategy_mkstemp,
Perl_my_mkostemp(templte, O_CLOEXEC),
Perl_my_mkstemp(templte));
#else
DO_ONEOPEN_THEN_CLOEXEC(Perl_my_mkstemp(templte));
#endif
}
int
Perl_my_mkostemp_cloexec(char *templte, int flags)
{
dVAR;
PERL_ARGS_ASSERT_MY_MKOSTEMP_CLOEXEC;
#if defined(O_CLOEXEC)
DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
PL_strategy_mkstemp,
Perl_my_mkostemp(templte, flags | O_CLOEXEC),
Perl_my_mkostemp(templte, flags));
#else
DO_ONEOPEN_THEN_CLOEXEC(Perl_my_mkostemp(templte, flags));
#endif
}
#ifdef HAS_PIPE
int
Perl_PerlProc_pipe_cloexec(pTHX_ int *pipefd)
{
dVAR;
PERL_ARGS_ASSERT_PERLPROC_PIPE_CLOEXEC;
/*
* struct IPerlProc doesn't cover pipe2(), and there's no clear way
* to extend it, so for the time being this just isn't available on
* PERL_IMPLICIT_SYS builds.
*/
# if !defined(PERL_IMPLICIT_SYS) && defined(HAS_PIPE2) && defined(O_CLOEXEC)
DO_PIPEOPEN_EXPERIMENTING_CLOEXEC(PL_strategy_pipe, pipefd,
pipe2(pipefd, O_CLOEXEC),
PerlProc_pipe(pipefd));
# else
DO_PIPEOPEN_THEN_CLOEXEC(pipefd, PerlProc_pipe(pipefd));
# endif
}
#endif
#ifdef HAS_SOCKET
int
Perl_PerlSock_socket_cloexec(pTHX_ int domain, int type, int protocol)
{
# if defined(SOCK_CLOEXEC)
dVAR;
DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
PL_strategy_socket,
PerlSock_socket(domain, type | SOCK_CLOEXEC, protocol),
PerlSock_socket(domain, type, protocol));
# else
DO_ONEOPEN_THEN_CLOEXEC(PerlSock_socket(domain, type, protocol));
# endif
}
int
Perl_PerlSock_accept_cloexec(pTHX_ int listenfd, struct sockaddr *addr,
Sock_size_t *addrlen)
{
# if !defined(PERL_IMPLICIT_SYS) && \
defined(HAS_ACCEPT4) && defined(SOCK_CLOEXEC)
/*
* struct IPerlSock doesn't cover accept4(), and there's no clear
* way to extend it, so for the time being this just isn't available
* on PERL_IMPLICIT_SYS builds.
*/
dVAR;
DO_ONEOPEN_EXPERIMENTING_CLOEXEC(
PL_strategy_accept,
accept4(listenfd, addr, addrlen, SOCK_CLOEXEC),
PerlSock_accept(listenfd, addr, addrlen));
# else
DO_ONEOPEN_THEN_CLOEXEC(PerlSock_accept(listenfd, addr, addrlen));
# endif
}
#endif
#if defined (HAS_SOCKETPAIR) || \
(defined (HAS_SOCKET) && defined(SOCK_DGRAM) && \
defined(AF_INET) && defined(PF_INET))
int
Perl_PerlSock_socketpair_cloexec(pTHX_ int domain, int type, int protocol,
int *pairfd)
{
dVAR;
PERL_ARGS_ASSERT_PERLSOCK_SOCKETPAIR_CLOEXEC;
# ifdef SOCK_CLOEXEC
DO_PIPEOPEN_EXPERIMENTING_CLOEXEC(PL_strategy_socketpair, pairfd,
PerlSock_socketpair(domain, type | SOCK_CLOEXEC, protocol, pairfd),
PerlSock_socketpair(domain, type, protocol, pairfd));
# else
DO_PIPEOPEN_THEN_CLOEXEC(pairfd,
PerlSock_socketpair(domain, type, protocol, pairfd));
# endif
}
#endif
static IO *
S_openn_setup(pTHX_ GV *gv, char *mode, PerlIO **saveifp, PerlIO **saveofp,
int *savefd, char *savetype)
{
IO * const io = GvIOn(gv);
PERL_ARGS_ASSERT_OPENN_SETUP;
*saveifp = NULL;
*saveofp = NULL;
*savefd = -1;
*savetype = IoTYPE_CLOSED;
Zero(mode,sizeof(mode),char);
PL_forkprocess = 1; /* assume true if no fork */
/* If currently open - close before we re-open */
if (IoIFP(io)) {
if (IoTYPE(io) == IoTYPE_STD) {
/* This is a clone of one of STD* handles */
}
else {
const int old_fd = PerlIO_fileno(IoIFP(io));
if (old_fd >= 0 && old_fd <= PL_maxsysfd) {
/* This is one of the original STD* handles */
*saveifp = IoIFP(io);
*saveofp = IoOFP(io);
*savetype = IoTYPE(io);
*savefd = old_fd;
}
else {
int result;
if (IoTYPE(io) == IoTYPE_PIPE)
result = PerlProc_pclose(IoIFP(io));
else if (IoIFP(io) != IoOFP(io)) {
if (IoOFP(io)) {
result = PerlIO_close(IoOFP(io));
PerlIO_close(IoIFP(io)); /* clear stdio, fd already closed */
}
else
result = PerlIO_close(IoIFP(io));
}
else
result = PerlIO_close(IoIFP(io));
if (result == EOF && old_fd > PL_maxsysfd) {
/* Why is this not Perl_warn*() call ? */
PerlIO_printf(Perl_error_log,
"Warning: unable to close filehandle %" HEKf
" properly.\n",
HEKfARG(GvENAME_HEK(gv))
);
}
}
}
IoOFP(io) = IoIFP(io) = NULL;
}
return io;
}
bool
Perl_do_openn(pTHX_ GV *gv, const char *oname, I32 len, int as_raw,
int rawmode, int rawperm, PerlIO *supplied_fp, SV **svp,
I32 num_svs)
{
PERL_ARGS_ASSERT_DO_OPENN;
if (as_raw) {
/* sysopen style args, i.e. integer mode and permissions */
if (num_svs != 0) {
Perl_croak(aTHX_ "panic: sysopen with multiple args, num_svs=%ld",
(long) num_svs);
}
return do_open_raw(gv, oname, len, rawmode, rawperm, NULL);
}
return do_open6(gv, oname, len, supplied_fp, svp, num_svs);
}
bool
Perl_do_open_raw(pTHX_ GV *gv, const char *oname, STRLEN len,
int rawmode, int rawperm, Stat_t *statbufp)
{
PerlIO *saveifp;
PerlIO *saveofp;
int savefd;
char savetype;
char mode[PERL_MODE_MAX]; /* file mode ("r\0", "rb\0", "ab\0" etc.) */
IO * const io = openn_setup(gv, mode, &saveifp, &saveofp, &savefd, &savetype);
int writing = 0;
PerlIO *fp;
PERL_ARGS_ASSERT_DO_OPEN_RAW;
/* For ease of blame back to 5.000, keep the existing indenting. */
{
/* sysopen style args, i.e. integer mode and permissions */
STRLEN ix = 0;
const int appendtrunc =
0
#ifdef O_APPEND /* Not fully portable. */
|O_APPEND
#endif
#ifdef O_TRUNC /* Not fully portable. */
|O_TRUNC
#endif
;
const int modifyingmode = O_WRONLY|O_RDWR|O_CREAT|appendtrunc;
int ismodifying;
SV *namesv;
/* It's not always
O_RDONLY 0
O_WRONLY 1
O_RDWR 2
It might be (in OS/390 and Mac OS Classic it is)
O_WRONLY 1
O_RDONLY 2
O_RDWR 3
This means that simple & with O_RDWR would look
like O_RDONLY is present. Therefore we have to
be more careful.
*/
if ((ismodifying = (rawmode & modifyingmode))) {
if ((ismodifying & O_WRONLY) == O_WRONLY ||
(ismodifying & O_RDWR) == O_RDWR ||
(ismodifying & (O_CREAT|appendtrunc)))
TAINT_PROPER("sysopen");
}
mode[ix++] = IoTYPE_NUMERIC; /* Marker to openn to use numeric "sysopen" */
#if defined(USE_64_BIT_RAWIO) && defined(O_LARGEFILE)
rawmode |= O_LARGEFILE; /* Transparently largefiley. */
#endif
IoTYPE(io) = PerlIO_intmode2str(rawmode, &mode[ix], &writing);
namesv = newSVpvn_flags(oname, len, SVs_TEMP);
fp = PerlIO_openn(aTHX_ NULL, mode, -1, rawmode, rawperm, NULL, 1, &namesv);
}
return openn_cleanup(gv, io, fp, mode, oname, saveifp, saveofp, savefd,
savetype, writing, 0, NULL, statbufp);
}
bool
Perl_do_open6(pTHX_ GV *gv, const char *oname, STRLEN len,
PerlIO *supplied_fp, SV **svp, U32 num_svs)
{
PerlIO *saveifp;
PerlIO *saveofp;
int savefd;
char savetype;
char mode[PERL_MODE_MAX]; /* file mode ("r\0", "rb\0", "ab\0" etc.) */
IO * const io = openn_setup(gv, mode, &saveifp, &saveofp, &savefd, &savetype);
int writing = 0;
PerlIO *fp;
bool was_fdopen = FALSE;
char *type = NULL;
PERL_ARGS_ASSERT_DO_OPEN6;
/* For ease of blame back to 5.000, keep the existing indenting. */
{
/* Regular (non-sys) open */
char *name;
STRLEN olen = len;
char *tend;
int dodup = 0;
bool in_raw = 0, in_crlf = 0, out_raw = 0, out_crlf = 0;
/* Collect default raw/crlf info from the op */
if (PL_op && PL_op->op_type == OP_OPEN) {
/* set up IO layers */
const U8 flags = PL_op->op_private;
in_raw = (flags & OPpOPEN_IN_RAW);
in_crlf = (flags & OPpOPEN_IN_CRLF);
out_raw = (flags & OPpOPEN_OUT_RAW);
out_crlf = (flags & OPpOPEN_OUT_CRLF);
}
type = savepvn(oname, len);
tend = type+len;
SAVEFREEPV(type);
/* Lose leading and trailing white space */
while (isSPACE(*type))
type++;
while (tend > type && isSPACE(tend[-1]))
*--tend = '\0';
if (num_svs) {
const char *p;
STRLEN nlen = 0;
/* New style explicit name, type is just mode and layer info */
#ifdef USE_STDIO
if (SvROK(*svp) && !memchr(oname, '&', len)) {
if (ckWARN(WARN_IO))
Perl_warner(aTHX_ packWARN(WARN_IO),
"Can't open a reference");
SETERRNO(EINVAL, LIB_INVARG);
fp = NULL;
goto say_false;
}
#endif /* USE_STDIO */
p = (SvOK(*svp) || SvGMAGICAL(*svp)) ? SvPV(*svp, nlen) : NULL;
if (p && !IS_SAFE_PATHNAME(p, nlen, "open")) {
fp = NULL;
goto say_false;
}
name = p ? savepvn(p, nlen) : savepvs("");
SAVEFREEPV(name);
}
else {
name = type;
len = tend-type;
}
IoTYPE(io) = *type;
if ((*type == IoTYPE_RDWR) && /* scary */
(*(type+1) == IoTYPE_RDONLY || *(type+1) == IoTYPE_WRONLY) &&
((!num_svs || (tend > type+1 && tend[-1] != IoTYPE_PIPE)))) {
TAINT_PROPER("open");
mode[1] = *type++;
writing = 1;
}
if (*type == IoTYPE_PIPE) {
if (num_svs) {
if (type[1] != IoTYPE_STD) {
unknown_open_mode:
Perl_croak(aTHX_ "Unknown open() mode '%.*s'", (int)olen, oname);
}
type++;
}
do {
type++;
} while (isSPACE(*type));
if (!num_svs) {
name = type;
len = tend-type;
}
if (*name == '\0') {
/* command is missing 19990114 */
if (ckWARN(WARN_PIPE))
Perl_warner(aTHX_ packWARN(WARN_PIPE), "Missing command in piped open");
errno = EPIPE;
fp = NULL;
goto say_false;
}
if (!(*name == '-' && name[1] == '\0') || num_svs)
TAINT_ENV();
TAINT_PROPER("piped open");
if (!num_svs && name[len-1] == '|') {
name[--len] = '\0' ;
if (ckWARN(WARN_PIPE))
Perl_warner(aTHX_ packWARN(WARN_PIPE), "Can't open bidirectional pipe");
}
mode[0] = 'w';
writing = 1;
if (out_raw)
mode[1] = 'b';
else if (out_crlf)
mode[1] = 't';
if (num_svs > 1) {
fp = PerlProc_popen_list(mode, num_svs, svp);
}
else {
fp = PerlProc_popen(name,mode);
}
if (num_svs) {
if (*type) {
if (PerlIO_apply_layers(aTHX_ fp, mode, type) != 0) {
fp = NULL;
goto say_false;
}
}
}
} /* IoTYPE_PIPE */
else if (*type == IoTYPE_WRONLY) {
TAINT_PROPER("open");
type++;
if (*type == IoTYPE_WRONLY) {
/* Two IoTYPE_WRONLYs in a row make for an IoTYPE_APPEND. */
mode[0] = IoTYPE(io) = IoTYPE_APPEND;
type++;
}
else {
mode[0] = 'w';
}
writing = 1;
if (out_raw)
mode[1] = 'b';
else if (out_crlf)
mode[1] = 't';
if (*type == '&') {
duplicity:
dodup = PERLIO_DUP_FD;
type++;
if (*type == '=') {
dodup = 0;
type++;
}
if (!num_svs && !*type && supplied_fp) {
/* "<+&" etc. is used by typemaps */
fp = supplied_fp;
}
else {
PerlIO *that_fp = NULL;
int wanted_fd;
UV uv;
if (num_svs > 1) {
/* diag_listed_as: More than one argument to '%s' open */
Perl_croak(aTHX_ "More than one argument to '%c&' open",IoTYPE(io));
}
while (isSPACE(*type))
type++;
if (num_svs && (
SvIOK(*svp)
|| (SvPOKp(*svp) && looks_like_number(*svp))
)) {
wanted_fd = SvUV(*svp);
num_svs = 0;
}
else if (isDIGIT(*type)
&& grok_atoUV(type, &uv, NULL)
&& uv <= INT_MAX
) {
wanted_fd = (int)uv;
}
else {
const IO* thatio;
if (num_svs) {
thatio = sv_2io(*svp);
}
else {
GV * const thatgv = gv_fetchpvn_flags(type, tend - type,
0, SVt_PVIO);
thatio = GvIO(thatgv);
}
if (!thatio) {
#ifdef EINVAL
SETERRNO(EINVAL,SS_IVCHAN);
#endif
fp = NULL;
goto say_false;
}
if ((that_fp = IoIFP(thatio))) {
/* Flush stdio buffer before dup. --mjd
* Unfortunately SEEK_CURing 0 seems to
* be optimized away on most platforms;
* only Solaris and Linux seem to flush
* on that. --jhi */
/* On the other hand, do all platforms
* take gracefully to flushing a read-only
* filehandle? Perhaps we should do
* fsetpos(src)+fgetpos(dst)? --nik */
PerlIO_flush(that_fp);
wanted_fd = PerlIO_fileno(that_fp);
/* When dup()ing STDIN, STDOUT or STDERR
* explicitly set appropriate access mode */
if (that_fp == PerlIO_stdout()
|| that_fp == PerlIO_stderr())
IoTYPE(io) = IoTYPE_WRONLY;
else if (that_fp == PerlIO_stdin())
IoTYPE(io) = IoTYPE_RDONLY;
/* When dup()ing a socket, say result is
* one as well */
else if (IoTYPE(thatio) == IoTYPE_SOCKET)
IoTYPE(io) = IoTYPE_SOCKET;
}
else {
SETERRNO(EBADF, RMS_IFI);
fp = NULL;
goto say_false;
}
}
if (!num_svs)
type = NULL;
if (that_fp) {
fp = PerlIO_fdupopen(aTHX_ that_fp, NULL, dodup);
}
else {
if (dodup)
wanted_fd = PerlLIO_dup_cloexec(wanted_fd);
else
was_fdopen = TRUE;
if (!(fp = PerlIO_openn(aTHX_ type,mode,wanted_fd,0,0,NULL,num_svs,svp))) {
if (dodup && wanted_fd >= 0)
PerlLIO_close(wanted_fd);
}
}
}
} /* & */
else {
while (isSPACE(*type))
type++;
if (*type == IoTYPE_STD && (!type[1] || isSPACE(type[1]) || type[1] == ':')) {
type++;
fp = PerlIO_stdout();
IoTYPE(io) = IoTYPE_STD;
if (num_svs > 1) {
/* diag_listed_as: More than one argument to '%s' open */
Perl_croak(aTHX_ "More than one argument to '>%c' open",IoTYPE_STD);
}
}
else {
if (num_svs) {
fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,num_svs,svp);
}
else {
SV *namesv = newSVpvn_flags(type, tend - type, SVs_TEMP);
type = NULL;
fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,1,&namesv);
}
}
} /* !& */
if (!fp && type && *type && *type != ':' && !isIDFIRST(*type))
goto unknown_open_mode;
} /* IoTYPE_WRONLY */
else if (*type == IoTYPE_RDONLY) {
do {
type++;
} while (isSPACE(*type));
mode[0] = 'r';
if (in_raw)
mode[1] = 'b';
else if (in_crlf)
mode[1] = 't';
if (*type == '&') {
goto duplicity;
}
if (*type == IoTYPE_STD && (!type[1] || isSPACE(type[1]) || type[1] == ':')) {
type++;
fp = PerlIO_stdin();
IoTYPE(io) = IoTYPE_STD;
if (num_svs > 1) {
/* diag_listed_as: More than one argument to '%s' open */
Perl_croak(aTHX_ "More than one argument to '<%c' open",IoTYPE_STD);
}
}
else {
if (num_svs) {
fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,num_svs,svp);
}
else {
SV *namesv = newSVpvn_flags(type, tend - type, SVs_TEMP);
type = NULL;
fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,1,&namesv);
}
}
if (!fp && type && *type && *type != ':' && !isIDFIRST(*type))
goto unknown_open_mode;
} /* IoTYPE_RDONLY */
else if ((num_svs && /* '-|...' or '...|' */
type[0] == IoTYPE_STD && type[1] == IoTYPE_PIPE) ||
(!num_svs && tend > type+1 && tend[-1] == IoTYPE_PIPE)) {
if (num_svs) {
type += 2; /* skip over '-|' */
}
else {
*--tend = '\0';
while (tend > type && isSPACE(tend[-1]))
*--tend = '\0';
for (; isSPACE(*type); type++)
;
name = type;
len = tend-type;
}
if (*name == '\0') {
/* command is missing 19990114 */
if (ckWARN(WARN_PIPE))
Perl_warner(aTHX_ packWARN(WARN_PIPE), "Missing command in piped open");
errno = EPIPE;
fp = NULL;
goto say_false;
}
if (!(*name == '-' && name[1] == '\0') || num_svs)
TAINT_ENV();
TAINT_PROPER("piped open");
mode[0] = 'r';
if (in_raw)
mode[1] = 'b';
else if (in_crlf)
mode[1] = 't';
if (num_svs > 1) {
fp = PerlProc_popen_list(mode,num_svs,svp);
}
else {
fp = PerlProc_popen(name,mode);
}
IoTYPE(io) = IoTYPE_PIPE;
if (num_svs) {
while (isSPACE(*type))
type++;
if (*type) {
if (PerlIO_apply_layers(aTHX_ fp, mode, type) != 0) {
fp = NULL;
goto say_false;
}
}
}
}
else { /* layer(Args) */
if (num_svs)
goto unknown_open_mode;
name = type;
IoTYPE(io) = IoTYPE_RDONLY;
for (; isSPACE(*name); name++)
;
mode[0] = 'r';
if (in_raw)
mode[1] = 'b';
else if (in_crlf)
mode[1] = 't';
if (*name == '-' && name[1] == '\0') {
fp = PerlIO_stdin();
IoTYPE(io) = IoTYPE_STD;
}
else {
if (num_svs) {
fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,num_svs,svp);
}
else {
SV *namesv = newSVpvn_flags(type, tend - type, SVs_TEMP);
type = NULL;
fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,1,&namesv);
}
}
}
}
say_false:
return openn_cleanup(gv, io, fp, mode, oname, saveifp, saveofp, savefd,
savetype, writing, was_fdopen, type, NULL);
}
/* Yes, this is ugly, but it's private, and I don't see a cleaner way to
simplify the two-headed public interface of do_openn. */
static bool
S_openn_cleanup(pTHX_ GV *gv, IO *io, PerlIO *fp, char *mode, const char *oname,
PerlIO *saveifp, PerlIO *saveofp, int savefd, char savetype,
int writing, bool was_fdopen, const char *type, Stat_t *statbufp)
{
int fd;
Stat_t statbuf;
PERL_ARGS_ASSERT_OPENN_CLEANUP;
Zero(&statbuf, 1, Stat_t);
if (!fp) {
if (IoTYPE(io) == IoTYPE_RDONLY && ckWARN(WARN_NEWLINE)
&& should_warn_nl(oname)
)
{
GCC_DIAG_IGNORE_STMT(-Wformat-nonliteral); /* PL_warn_nl is constant */
Perl_warner(aTHX_ packWARN(WARN_NEWLINE), PL_warn_nl, "open");
GCC_DIAG_RESTORE_STMT;
}
goto say_false;
}
if (ckWARN(WARN_IO)) {
if ((IoTYPE(io) == IoTYPE_RDONLY) &&
(fp == PerlIO_stdout() || fp == PerlIO_stderr())) {
Perl_warner(aTHX_ packWARN(WARN_IO),
"Filehandle STD%s reopened as %" HEKf
" only for input",
((fp == PerlIO_stdout()) ? "OUT" : "ERR"),
HEKfARG(GvENAME_HEK(gv)));
}
else if ((IoTYPE(io) == IoTYPE_WRONLY) && fp == PerlIO_stdin()) {
Perl_warner(aTHX_ packWARN(WARN_IO),
"Filehandle STDIN reopened as %" HEKf " only for output",
HEKfARG(GvENAME_HEK(gv))
);
}
}
fd = PerlIO_fileno(fp);
/* Do NOT do: "if (fd < 0) goto say_false;" here. If there is no
* fd assume it isn't a socket - this covers PerlIO::scalar -
* otherwise unless we "know" the type probe for socket-ness.
*/
if (IoTYPE(io) && IoTYPE(io) != IoTYPE_PIPE && IoTYPE(io) != IoTYPE_STD && fd >= 0) {
if (PerlLIO_fstat(fd,&statbuf) < 0) {
/* If PerlIO claims to have fd we had better be able to fstat() it. */
(void) PerlIO_close(fp);
goto say_false;
}
#ifndef PERL_MICRO
if (S_ISSOCK(statbuf.st_mode))
IoTYPE(io) = IoTYPE_SOCKET; /* in case a socket was passed in to us */
#ifdef HAS_SOCKET
else if (
!(statbuf.st_mode & S_IFMT)
&& IoTYPE(io) != IoTYPE_WRONLY /* Dups of STD* filehandles already have */
&& IoTYPE(io) != IoTYPE_RDONLY /* type so they aren't marked as sockets */
) { /* on OS's that return 0 on fstat()ed pipe */
char tmpbuf[256];
Sock_size_t buflen = sizeof tmpbuf;
if (PerlSock_getsockname(fd, (struct sockaddr *)tmpbuf, &buflen) >= 0
|| errno != ENOTSOCK)
IoTYPE(io) = IoTYPE_SOCKET; /* some OS's return 0 on fstat()ed socket */
/* but some return 0 for streams too, sigh */
}
#endif /* HAS_SOCKET */
#endif /* !PERL_MICRO */
}
/* Eeek - FIXME !!!
* If this is a standard handle we discard all the layer stuff
* and just dup the fd into whatever was on the handle before !
*/
if (saveifp) { /* must use old fp? */
/* If fd is less that PL_maxsysfd i.e. STDIN..STDERR
then dup the new fileno down
*/
if (saveofp) {
PerlIO_flush(saveofp); /* emulate PerlIO_close() */
if (saveofp != saveifp) { /* was a socket? */
PerlIO_close(saveofp);
}