/* define normal version that locks/unlocks, validates fh */
int __cdecl _read (
int fh,
void *buf,
unsigned cnt
)
{
int r; /* return value */
/* validate handle */
_CHECK_FH_CLEAR_OSSERR_RETURN( fh, EBADF, -1 );
_VALIDATE_CLEAR_OSSERR_RETURN((fh >= 0 && (unsigned)fh < (unsigned)_nhandle), EBADF, -1);
_VALIDATE_CLEAR_OSSERR_RETURN((_osfile(fh) & FOPEN), EBADF, -1);
_lock_fh(fh); /* lock file */
__try {
if ( _osfile(fh) & FOPEN )
r = _read_nolock(fh, buf, cnt); /* read bytes */
else {
errno = EBADF;
_doserrno = 0;
r = -1;
_ASSERTE(("Invalid file descriptor. File possibly closed by a different thread",0));
}
}
__finally {
_unlock_fh(fh); /* unlock file */
}
return r;
}
/* define locking/validating lseek */
long __cdecl _lseek (
int fh,
long pos,
int mthd
)
{
int r;
/* validate fh */
_CHECK_FH_CLEAR_OSSERR_RETURN( fh, EBADF, -1 );
_VALIDATE_CLEAR_OSSERR_RETURN((fh >= 0 && (unsigned)fh < (unsigned)_nhandle), EBADF, -1);
_VALIDATE_CLEAR_OSSERR_RETURN((_osfile(fh) & FOPEN), EBADF, -1);
_lock_fh(fh); /* lock file handle */
__try {
if ( _osfile(fh) & FOPEN )
r = _lseek_nolock(fh, pos, mthd); /* seek */
else {
errno = EBADF;
_doserrno = 0;
r = -1;
_ASSERTE(("Invalid file descriptor. File possibly closed by a different thread",0));
}
}
__finally {
_unlock_fh(fh); /* unlock file handle */
}
return r;
}
int __cdecl _dup (
int fh
)
{
int newfh =-1; /* variable for new file handle */
/* validate file handle */
_CHECK_FH_CLEAR_OSSERR_RETURN( fh, EBADF, -1 );
_VALIDATE_CLEAR_OSSERR_RETURN((fh >= 0 && (unsigned)fh < (unsigned)_nhandle), EBADF, -1);
_VALIDATE_CLEAR_OSSERR_RETURN((_osfile(fh) & FOPEN), EBADF, -1);
_lock_fh(fh); /* lock file handle */
__TRY
if ( _osfile(fh) & FOPEN )
newfh = _dup_nolock(fh);
else {
errno = EBADF;
_doserrno = 0;
newfh = -1;
_ASSERTE(("Invalid file descriptor. File possibly closed by a different thread",0));
}
__FINALLY
_unlock_fh(fh);
__END_TRY_FINALLY
return newfh;
}
int __cdecl _setmode(
int fh,
int mode
) {
int retval;
_VALIDATE_RETURN(((mode == _O_TEXT) ||
(mode == _O_BINARY) ||
(mode == _O_WTEXT) ||
(mode == _O_U8TEXT) ||
(mode == _O_U16TEXT)),
EINVAL, -1);
_CHECK_FH_RETURN(fh, EBADF, -1);
_VALIDATE_RETURN((fh >= 0 && (unsigned)fh < (unsigned)_nhandle), EBADF, -1);
_VALIDATE_RETURN((_osfile(fh) & FOPEN), EBADF, -1);
/* lock the file */
_lock_fh(fh);
__try {
if (_osfile(fh) & FOPEN)
/* set the text/binary mode */
{
retval = _setmode_nolock(fh, mode);
} else {
errno = EBADF;
_ASSERTE(("Invalid file descriptor. File possibly closed by a different thread", 0));
retval = -1;
}
} __finally {
/* unlock the file */
_unlock_fh(fh);
}
/* Return to user (_setmode_nolock sets errno, if needed) */
return (retval);
}
int __cdecl _dup2 (
int fh1,
int fh2
)
{
int retcode;
/* validate file handles */
_CHECK_FH_CLEAR_OSSERR_RETURN( fh1, EBADF, -1 );
_VALIDATE_CLEAR_OSSERR_RETURN((fh1 >= 0 && (unsigned)fh1 < (unsigned)_nhandle), EBADF, -1);
_VALIDATE_CLEAR_OSSERR_RETURN((_osfile(fh1) & FOPEN), EBADF, -1);
_CHECK_FH_CLEAR_OSSERR_RETURN( fh2, EBADF, -1 );
_VALIDATE_CLEAR_OSSERR_RETURN(((unsigned)fh2 < _NHANDLE_), EBADF, -1);
/*
* Make sure there is an ioinfo struct corresponding to fh2.
*/
if ( (fh2 >= _nhandle) && (extend_ioinfo_arrays(fh2) != 0) ) {
errno = ENOMEM;
return -1;
}
/* get the two file handle locks; in order to prevent deadlock,
get the lowest handle lock first. */
if ( fh1 < fh2 ) {
_lock_fh(fh1);
_lock_fh(fh2);
}
else if ( fh1 > fh2 ) {
_lock_fh(fh2);
_lock_fh(fh1);
}
__try {
retcode = _dup2_nolock(fh1, fh2);
}
__finally {
_unlock_fh(fh1);
_unlock_fh(fh2);
}
return retcode;
}
int __cdecl _eof (
int filedes
)
{
__int64 here;
__int64 end;
int retval;
_CHECK_FH_CLEAR_OSSERR_RETURN( filedes, EBADF, -1 );
_VALIDATE_CLEAR_OSSERR_RETURN((filedes >= 0 && (unsigned)filedes < (unsigned)_nhandle), EBADF, -1);
_VALIDATE_CLEAR_OSSERR_RETURN((_osfile(filedes) & FOPEN), EBADF, -1);
/* Lock the file */
_lock_fh(filedes);
__try {
if ( _osfile(filedes) & FOPEN ) {
/* See if the current position equals the end of the file. */
if ( ((here = _lseeki64_nolock(filedes, 0i64, SEEK_CUR)) == -1i64) ||
((end = _lseeki64_nolock(filedes, 0i64, SEEK_END)) == -1i64) )
retval = -1;
else if ( here == end )
retval = 1;
else {
_lseeki64_nolock(filedes, here, SEEK_SET);
retval = 0;
}
}
else {
errno = EBADF;
_doserrno = 0;
retval = -1;
_ASSERTE(("Invalid file descriptor. File possibly closed by a different thread",0));
}
}
__finally {
/* Unlock the file */
_unlock_fh(filedes);
}
/* Done */
return(retval);
}
void __cdecl _wperror (
const wchar_t *wmessage
)
{
int fh = 2;
size_t size = 0;
char *amessage;
const char *sysmessage;
/* convert WCS string into ASCII string */
if ( wmessage && *wmessage )
{
_ERRCHECK_EINVAL_ERANGE(wcstombs_s( &size, NULL, 0, wmessage, INT_MAX));
if ( size==0 || (amessage = (char *)_calloc_crt(size, sizeof(char))) == NULL )
return;
if ( _ERRCHECK_EINVAL_ERANGE(wcstombs_s(NULL, amessage, size, wmessage, _TRUNCATE)) != 0)
{
_free_crt(amessage);
return;
}
}
else
amessage = NULL;
_lock_fh( fh ); /* acquire file handle lock */
__try {
if ( amessage )
{
_write_nolock(fh,(char *)amessage,(unsigned)strlen(amessage));
_write_nolock(fh,": ",2);
}
_free_crt(amessage); /* note: freeing NULL is legal and benign */
sysmessage = _get_sys_err_msg( errno );
_write_nolock(fh, sysmessage,(unsigned)strlen(sysmessage));
_write_nolock(fh,"\n",1);
}
__finally {
_unlock_fh( fh ); /* release file handle lock */
}
}
int __cdecl _commit (
int filedes
)
{
int retval;
/* if filedes out of range, complain */
_CHECK_FH_RETURN( filedes, EBADF, -1 );
_VALIDATE_RETURN((filedes >= 0 && (unsigned)filedes < (unsigned)_nhandle), EBADF, -1);
_VALIDATE_RETURN((_osfile(filedes) & FOPEN), EBADF, -1);
_lock_fh(filedes);
__try {
if (_osfile(filedes) & FOPEN) {
if ( !FlushFileBuffers((HANDLE)_get_osfhandle(filedes)) ) {
retval = GetLastError();
}
else {
retval = 0; /* return success */
}
/* map the OS return code to C errno value and return code */
if (retval == 0)
goto good;
_doserrno = retval;
}
errno = EBADF;
retval = -1;
_ASSERTE(("Invalid file descriptor. File possibly closed by a different thread",0));
good :
;
}
__finally {
_unlock_fh(filedes);
}
return (retval);
}
int __cdecl _commit (
int filedes
)
{
int retval;
/* if filedes out of range, complain */
if ( ((unsigned)filedes >= (unsigned)_nhandle) ||
!(_osfile(filedes) & FOPEN) )
{
errno = EBADF;
return (-1);
}
_lock_fh(filedes);
/* if filedes open, try to commit, else fall through to bad */
if (_osfile(filedes) & FOPEN) {
if ( !FlushFileBuffers((HANDLE)_get_osfhandle(filedes)) ) {
retval = GetLastError();
} else {
retval = 0; /* return success */
}
/* map the OS return code to C errno value and return code */
if (retval == 0) {
goto good;
} else {
_doserrno = retval;
goto bad;
}
}
bad :
errno = EBADF;
retval = -1;
good :
_unlock_fh(filedes);
return (retval);
}
int __cdecl _close (
int fh
)
{
int r; /* return value */
/* validate file handle */
if ( ((unsigned)fh >= (unsigned)_nhandle) ||
!(_osfile(fh) & FOPEN) )
{
/* bad file handle, set errno and abort */
errno = EBADF;
_doserrno = 0;
return -1;
}
_lock_fh(fh); /* lock file */
r = _close_lk(fh);
_unlock_fh(fh); /* unlock the file */
return r;
}
void __cdecl _wperror (
REG1 const wchar_t *wmessage
)
{
REG2 int fh = 2;
int size;
char *amessage;
/* convert WCS string into ASCII string */
size = wcslen(wmessage) + 1;
if (NULL == (amessage = (char *)_malloc_crt(size * sizeof(char))))
return;
if (0 == (wcstombs(amessage, wmessage, size)))
{
_free_crt (amessage);
return;
}
_lock_fh(fh); /* acquire file handle lock */
if (amessage && *amessage)
{
_write_lk(fh,(char *)amessage,strlen(amessage));
_write_lk(fh,": ",2);
}
_free_crt(amessage);
amessage = _sys_err_msg( errno );
_write_lk(fh,(char *)amessage,strlen(amessage));
_write_lk(fh,"\n",1);
_unlock_fh(fh); /* release file handle lock */
}
int __cdecl _eof (
int filedes
)
{
long here;
long end;
int retval;
if ( ((unsigned)filedes >= (unsigned)_nhandle) ||
!(_osfile(filedes) & FOPEN) )
{
errno = EBADF;
_doserrno = 0;
return(-1);
}
/* Lock the file */
_lock_fh(filedes);
/* See if the current position equals the end of the file. */
if ( ((here = _lseek_lk(filedes, 0L, SEEK_CUR)) == -1L) ||
((end = _lseek_lk(filedes, 0L, SEEK_END)) == -1L) )
retval = -1;
else if ( here == end )
retval = 1;
else {
_lseek_lk(filedes, here, SEEK_SET);
retval = 0;
}
/* Unlock the file */
_unlock_fh(filedes);
/* Done */
return(retval);
}
int __cdecl _dup (
int fh
)
{
ULONG dosretval; /* o.s. return value */
int newfh; /* variable for new file handle */
char fileinfo; /* _osfile info for file */
long new_osfhandle;
/* validate file handle */
if ( ((unsigned)fh >= (unsigned)_nhandle) ||
!(_osfile(fh) & FOPEN) )
{
errno = EBADF;
_doserrno = 0; /* no o.s. error */
return -1;
}
_lock_fh(fh); /* lock file handle */
fileinfo = _osfile(fh); /* get file info for file */
/* create duplicate handle */
if ( (newfh = _alloc_osfhnd()) == -1 )
{
errno = EMFILE; /* too many files error */
_doserrno = 0L; /* not an OS error */
_unlock_fh(fh);
return -1; /* return error to caller */
}
/*
* duplicate the file handle
*/
if ( !(DuplicateHandle(GetCurrentProcess(),
(HANDLE)_get_osfhandle(fh),
GetCurrentProcess(),
(PHANDLE)&new_osfhandle,
0L,
TRUE,
DUPLICATE_SAME_ACCESS)) )
{
dosretval = GetLastError();
}
else {
_set_osfhnd(newfh, new_osfhandle);
dosretval = 0;
}
_unlock_fh(newfh);
_unlock_fh(fh); /* unlock file handle */
if (dosretval) {
/* o.s. error -- map and return */
_dosmaperr(dosretval);
return -1;
}
/*
* copy the _osfile value, with the FNOINHERIT bit cleared
*/
_osfile(newfh) = fileinfo & ~FNOINHERIT;
return newfh;
}
int __cdecl _pipe (
int phandles[2],
unsigned psize,
int textmode
)
{
ULONG dosretval; /* o.s. return value */
HANDLE ReadHandle, WriteHandle;
SECURITY_ATTRIBUTES SecurityAttributes;
SecurityAttributes.nLength = sizeof(SecurityAttributes);
SecurityAttributes.lpSecurityDescriptor = NULL;
if (textmode & _O_NOINHERIT) {
SecurityAttributes.bInheritHandle = FALSE;
}
else {
SecurityAttributes.bInheritHandle = TRUE;
}
if (!CreatePipe(&ReadHandle, &WriteHandle, &SecurityAttributes, psize)) {
/* o.s. error */
dosretval = GetLastError();
_dosmaperr(dosretval);
return -1;
}
/* now we must allocate C Runtime handles for Read and Write handles */
if ((phandles[0] = _alloc_osfhnd()) != -1) {
_osfile(phandles[0]) = (char)(FOPEN | FPIPE | FTEXT);
if ((phandles[1] = _alloc_osfhnd()) != -1) {
_osfile(phandles[1]) = (char)(FOPEN | FPIPE | FTEXT);
if ( (textmode & _O_BINARY) ||
(((textmode & _O_TEXT) == 0) &&
(_fmode == _O_BINARY)) ) {
/* binary mode */
_osfile(phandles[0]) &= ~FTEXT;
_osfile(phandles[1]) &= ~FTEXT;
}
if ( textmode & _O_NOINHERIT ) {
_osfile(phandles[0]) |= FNOINHERIT;
_osfile(phandles[1]) |= FNOINHERIT;
}
_set_osfhnd(phandles[0], (long)ReadHandle);
_set_osfhnd(phandles[1], (long)WriteHandle);
errno = 0;
_unlock_fh(phandles[1]); /* unlock handle */
}
else {
_osfile(phandles[0]) = 0;
errno = EMFILE; /* too many files */
}
_unlock_fh(phandles[0]); /* unlock handle */
}
else {
errno = EMFILE; /* too many files */
}
/* If error occurred, close Win32 handles and return -1 */
if (errno != 0) {
CloseHandle(ReadHandle);
CloseHandle(WriteHandle);
_doserrno = 0; /* not an o.s. error */
return -1;
}
return 0;
}
static int __cdecl _dup_nolock(
int fh
)
{
int newfh; /* variable for new file handle */
ULONG dosretval; /* o.s. return value */
char fileinfo; /* _osfile info for file */
intptr_t new_osfhandle;
int success = FALSE;
fileinfo = _osfile(fh); /* get file info for file */
if ( !(_osfile(fh) & FOPEN) )
return -1;
/* create duplicate handle */
if ( (newfh = _alloc_osfhnd()) == -1 )
{
errno = EMFILE; /* too many files error */
_doserrno = 0L; /* not an OS error */
return -1; /* return error to caller */
}
__TRY
/*
* duplicate the file handle
*/
if ( !(DuplicateHandle(GetCurrentProcess(),
(HANDLE)_get_osfhandle(fh),
GetCurrentProcess(),
(PHANDLE)&new_osfhandle,
0L,
TRUE,
DUPLICATE_SAME_ACCESS)) )
{
dosretval = GetLastError();
}
else {
_set_osfhnd(newfh, new_osfhandle);
dosretval = 0;
}
if (dosretval)
{
/* o.s. error -- map errpr and release handle */
_dosmaperr(dosretval);
}
else
{
/*
* copy the _osfile value, with the FNOINHERIT bit cleared
*/
_osfile(newfh) = fileinfo & ~FNOINHERIT;
_textmode(newfh) = _textmode(fh);
_tm_unicode(newfh) = _tm_unicode(fh);
success = TRUE;
}
__FINALLY
if (!success)
{
_osfile(newfh) &= ~FOPEN;
}
_unlock_fh(newfh);
__END_TRY_FINALLY
return success ? newfh : -1;
}
FILE * __cdecl _tpopen (
const _TSCHAR *cmdstring,
const _TSCHAR *type
)
{
int phdls[2]; /* I/O handles for pipe */
int ph_open[2]; /* flags, set if correspond phdls is open */
int i1; /* index into phdls[] */
int i2; /* index into phdls[] */
int tm = 0; /* flag indicating text or binary mode */
int stdhdl; /* either STDIN or STDOUT */
HANDLE osfhndsv1; /* used to save _osfhnd(stdhdl) */
long osfhndsv2; /* used to save _osfhnd(phdls[i2]) */
char osfilesv1; /* used to save _osfile(stdhdl) */
char osfilesv2; /* used to save _osfile(phdls[i2]) */
HANDLE oldhnd; /* used to hold OS file handle values... */
HANDLE newhnd; /* ...in calls to DuplicateHandle API */
FILE *pstream; /* stream to be associated with pipe */
HANDLE prochnd; /* handle for current process */
_TSCHAR *cmdexe; /* pathname for the command processor */
int childhnd; /* handle for child process (cmd.exe) */
IDpair *locidpair; /* pointer to IDpair table entry */
/* first check for errors in the arguments
*/
if ( (cmdstring == NULL) || (type == NULL) || ((*type != 'w') &&
(*type != _T('r'))) )
goto error1;
/* do the _pipe(). note that neither of the resulting handles will
* be inheritable.
*/
if ( *(type + 1) == _T('t') )
tm = _O_TEXT;
else if ( *(type + 1) == _T('b') )
tm = _O_BINARY;
tm |= _O_NOINHERIT;
if ( _pipe( phdls, PSIZE, tm ) == -1 )
goto error1;
/* test *type and set stdhdl, i1 and i2 accordingly.
*/
if ( *type == _T('w') ) {
stdhdl = STDIN;
i1 = 0;
i2 = 1;
}
else {
stdhdl = STDOUT;
i1 = 1;
i2 = 0;
}
/* the pipe now exists. the following steps must be carried out before
* the child process (cmd.exe) may be spawned:
*
* 1. save a non-inheritable dup of stdhdl
*
* 2. force stdhdl to be a dup of ph[i1]. close both ph[i1] and
* the original OS handle underlying stdhdl
*
* 3. associate a stdio-level stream with ph[i2].
*/
/* set flags to indicate pipe handles are open. note, these are only
* used for error recovery.
*/
ph_open[ 0 ] = ph_open[ 1 ] = 1;
/* get the process handle, it will be needed in some API calls
*/
prochnd = GetCurrentProcess();
/* MULTI-THREAD: ASSERT LOCK ON STDHDL HERE!!!!
*/
_lock_fh( stdhdl );
/* save a non-inheritable copy of stdhdl for later restoration.
*/
oldhnd = (HANDLE)_osfhnd( stdhdl );
if ( (oldhnd == INVALID_HANDLE_VALUE) ||
!DuplicateHandle( prochnd,
oldhnd,
prochnd,
&osfhndsv1,
0L,
FALSE, /* non-inheritable */
DUPLICATE_SAME_ACCESS )
) {
goto error2;
}
osfilesv1 = _osfile( stdhdl );
/* force stdhdl to an inheritable dup of phdls[i1] (i.e., force
* STDIN to the pipe read handle or STDOUT to the pipe write handle)
* and close phdls[i1] (so there won't be a stray open handle on the
* pipe after a _pclose). also, clear ph_open[i1] flag so that error
* recovery won't try to close it again.
*/
if ( !DuplicateHandle( prochnd,
(HANDLE)_osfhnd( phdls[i1] ),
prochnd,
&newhnd,
0L,
TRUE, /* inheritable */
DUPLICATE_SAME_ACCESS )
) {
goto error3;
}
(void)CloseHandle( (HANDLE)_osfhnd(stdhdl) );
_free_osfhnd( stdhdl );
_set_osfhnd( stdhdl, (long)newhnd );
_osfile( stdhdl ) = _osfile( phdls[i1] );
(void)_close( phdls[i1] );
ph_open[ i1 ] = 0;
/* associate a stream with phdls[i2]. note that if there are no
* errors, pstream is the return value to the caller.
*/
if ( (pstream = _tfdopen( phdls[i2], type )) == NULL )
goto error4;
/* MULTI-THREAD: ASSERT LOCK ON IDPAIRS HERE!!!!
*/
_mlock( _POPEN_LOCK );
/* next, set locidpair to a free entry in the idpairs table.
*/
if ( (locidpair = idtab( NULL )) == NULL )
goto error5;
/* temporarily change the osfhnd and osfile entries so that
* the child doesn't get any entries for phdls[i2].
*/
osfhndsv2 = _osfhnd( phdls[i2] );
_osfhnd( phdls[i2] ) = (long)INVALID_HANDLE_VALUE;
osfilesv2 = _osfile( phdls[i2] );
_osfile( phdls[i2] ) = 0;
/* spawn the child copy of cmd.exe. the algorithm is adapted from
* SYSTEM.C, and behaves the same way.
*/
if ( ((cmdexe = _tgetenv(_T("COMSPEC"))) == NULL) ||
(((childhnd = _tspawnl( _P_NOWAIT,
cmdexe,
cmdexe,
_T("/c"),
cmdstring,
NULL ))
== -1) && ((errno == ENOENT) || (errno == EACCES))) ) {
/*
* either COMSPEC wasn't defined, or the spawn failed because
* cmdexe wasn't found or was inaccessible. in either case, try to
* spawn "cmd.exe" (Windows NT) or "command.com" (Windows 95) instead
* Note that spawnlp is used here so that the path is searched.
*/
cmdexe = ( _osver & 0x8000 ) ? _T("command.com") : _T("cmd.exe");
childhnd = _tspawnlp( _P_NOWAIT,
cmdexe,
cmdexe,
_T("/c"),
cmdstring,
NULL);
}
_osfhnd( phdls[i2] ) = osfhndsv2;
_osfile( phdls[i2] ) = osfilesv2;
/* check if the last (perhaps only) spawn attempt was successful
*/
if ( childhnd == -1 )
goto error6;
/* restore stdhdl for the current process, set value of *locidpair,
* close osfhndsv1 (note that CloseHandle must be used instead of close)
* and return pstream to the caller
*/
(void)DuplicateHandle( prochnd,
osfhndsv1,
prochnd,
&newhnd,
0L,
TRUE, /* inheritable */
DUPLICATE_CLOSE_SOURCE | /* close osfhndsv1 */
DUPLICATE_SAME_ACCESS );
(void)CloseHandle( (HANDLE)_osfhnd(stdhdl) );
_free_osfhnd( stdhdl );
_set_osfhnd( stdhdl, (long)newhnd );
_osfile(stdhdl) = osfilesv1;
/* MULTI-THREAD: RELEASE LOCK ON STDHDL HERE!!!!
*/
_unlock_fh( stdhdl );
locidpair->prochnd = childhnd;
locidpair->stream = pstream;
/* MULTI-THREAD: RELEASE LOCK ON IDPAIRS HERE!!!!
*/
_munlock( _POPEN_LOCK );
/* all successful calls to _popen return to the caller via this return
* statement!
*/
return( pstream );
/**
* error handling code. all detected errors end up here, entering
* via a goto one of the labels. note that the logic is currently
* a straight fall-thru scheme (e.g., if entered at error5, the
* code for error5, error4,...,error1 is all executed).
**********************************************************************/
error6: /* make sure locidpair is reusable
*/
locidpair->stream = NULL;
error5: /* close pstream (also, clear ph_open[i2] since the stream
* close will also close the pipe handle)
*/
(void)fclose( pstream );
ph_open[ i2 ] = 0;
/* MULTI-THREAD: RELEASE LOCK ON IDPAIRS HERE!!!!
*/
_munlock(_POPEN_LOCK);
error4: /* restore stdhdl
*/
(void)DuplicateHandle( prochnd,
osfhndsv1,
prochnd,
&newhnd,
0L,
TRUE,
DUPLICATE_SAME_ACCESS );
(void)CloseHandle( (HANDLE)_osfhnd(stdhdl) );
_free_osfhnd( stdhdl );
_set_osfhnd( stdhdl, (long)newhnd );
_osfile( stdhdl ) = osfilesv1;
/* MULTI-THREAD: RELEASE LOCK ON STDHDL HERE!!!!
*/
_unlock_fh( stdhdl );
error3: /* close osfhndsv1
*/
CloseHandle( osfhndsv1 );
error2: /* close handles on pipe (if they are still open)
*/
if ( ph_open[i1] )
_close( phdls[i1] );
if ( ph_open[i2] )
_close( phdls[i2] );
error1: /* return NULL to the caller indicating failure
*/
return( NULL );
}
int __cdecl _dup2 (
int fh1,
int fh2
)
{
ULONG dosretval; /* o.s. return code */
/* validate file handles */
if ( ((unsigned)fh1 >= (unsigned)_nhandle) ||
!(_osfile(fh1) & FOPEN) ||
((unsigned)fh2 >= _NHANDLE_) ) {
/* handle out of range */
errno = EBADF;
_doserrno = 0; /* not an OS error */
return -1;
}
/*
* Make sure there is an ioinfo struct corresponding to fh2.
*/
if ( (fh2 >= _nhandle) && (extend_ioinfo_arrays(fh2) != 0) ) {
errno = ENOMEM;
return -1;
}
#if defined(_MT) && !defined(DLL_FOR_WIN32S)
/* get the two file handle locks; in order to prevent deadlock,
get the lowest handle lock first. */
if ( fh1 < fh2 ) {
_lock_fh(fh1);
_lock_fh(fh2);
}
else if ( fh1 > fh2 ) {
_lock_fh(fh2);
_lock_fh(fh1);
}
/*
* Re-test and take care of case of unopened source handle. This is
* necessary only in the multi-thread case where the file have been
* closed by another thread before the lock was asserted, but after
* the initial test above.
*/
if ( !(_osfile(fh1) & FOPEN) ) {
/*
* Source handle isn't open, release locks and bail out with
* an error. Note that the DuplicateHandle API will not
* detect this error since it implies that _osfhnd(fh1) ==
* INVALID_HANDLE_VALUE, and this is a legal HANDLE value
* (it's the HANDLE for the current process).
*/
_unlock_fh(fh1);
_unlock_fh(fh2);
errno = EBADF;
_doserrno = 0; /* not an OS error */
return -1;
}
#endif
/*
* Take of the case of equal handles.
*/
if ( fh1 == fh2 ) {
/*
* Since fh1 is known to be open, return 0 indicating success.
* This is in conformance with the POSIX specification for
* dup2.
*/
_unlock_fh(fh1);
_unlock_fh(fh2);
return 0;
}
/*
* if fh2 is open, close it.
*/
if ( _osfile(fh2) & FOPEN )
/*
* close the handle. ignore the possibility of an error - an
* error simply means that an OS handle value may remain bound
* for the duration of the process. Use _close_lk as we
* already own lock
*/
(void) _close_lk(fh2);
/* Duplicate source file onto target file */
{
long new_osfhandle;
if ( !(DuplicateHandle(GetCurrentProcess(),
(HANDLE)_get_osfhandle(fh1),
GetCurrentProcess(),
(PHANDLE)&new_osfhandle,
0L,
TRUE,
DUPLICATE_SAME_ACCESS)
) ) {
dosretval = GetLastError();
} else {
_set_osfhnd(fh2, new_osfhandle);
dosretval = 0;
}
}
if (dosretval) {
_dosmaperr(dosretval);
_unlock_fh(fh1);
_unlock_fh(fh2);
return -1;
}
/* copy _osfile information */
_osfile(fh2) = _osfile(fh1);
/* unlock file handles */
_unlock_fh(fh1);
_unlock_fh(fh2);
return 0;
}
