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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697//// dup.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Defines _dup() and _dup_nolock, which duplicate lowio file handles//#include <corecrt_internal_lowio.h>#include <corecrt_internal_ptd_propagation.h>
static int __cdecl duplicate_osfhnd(int const fh, int const new_fh, __crt_cached_ptd_host& ptd) throw(){ // Duplicate the file handle: intptr_t new_osfhandle;
BOOL const result = DuplicateHandle( GetCurrentProcess(), reinterpret_cast<HANDLE>(_get_osfhandle(fh)), GetCurrentProcess(), &reinterpret_cast<HANDLE&>(new_osfhandle), 0L, TRUE, DUPLICATE_SAME_ACCESS);
if (!result) { __acrt_errno_map_os_error_ptd(GetLastError(), ptd); return -1; }
// Duplicate the handle state: __acrt_lowio_set_os_handle(new_fh, new_osfhandle); _osfile(new_fh) = _osfile(fh) & ~FNOINHERIT; _textmode(new_fh) = _textmode(fh); _tm_unicode(new_fh) = _tm_unicode(fh); return new_fh;}
static int __cdecl _dup_nolock_internal(int const fh, __crt_cached_ptd_host& ptd) throw(){ if ((_osfile(fh) & FOPEN) == 0) { ptd.get_errno().set(EBADF); ptd.get_doserrno().set(0); _ASSERTE(("Invalid file descriptor. File possibly closed by a different thread", 0)); return -1; }
// Allocate a duplicate handle int const new_fh = _alloc_osfhnd(); if (new_fh == -1) { ptd.get_errno().set(EMFILE); ptd.get_doserrno().set(0); return -1; }
int return_value = -1; __try { return_value = duplicate_osfhnd(fh, new_fh, ptd); } __finally { // The handle returned by _alloc_osfhnd is both open and locked. If we // failed to duplicate the handle, we need to abandon the handle by // unsetting the open flag. We always need to unlock the handle: if (return_value == -1) { _osfile(new_fh) &= ~FOPEN; }
__acrt_lowio_unlock_fh(new_fh); } __endtry return return_value;}
static int __cdecl _dup_internal(int const fh, __crt_cached_ptd_host& ptd){ _UCRT_CHECK_FH_CLEAR_OSSERR_RETURN(ptd, fh, EBADF, -1); _UCRT_VALIDATE_CLEAR_OSSERR_RETURN(ptd, (fh >= 0 && (unsigned)fh < (unsigned)_nhandle), EBADF, -1); _UCRT_VALIDATE_CLEAR_OSSERR_RETURN(ptd, (_osfile(fh) & FOPEN), EBADF, -1);
return __acrt_lowio_lock_fh_and_call(fh, [&](){ return _dup_nolock_internal(fh, ptd); });}
// _dup() duplicates a file handle and returns the duplicate. If the function// fails, -1 is returned and errno is set.extern "C" int __cdecl _dup(int const fh){ __crt_cached_ptd_host ptd; return _dup_internal(fh, ptd);}