Something went wrong. Try again.
Reactos
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102//// close.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Defines _close(), which closes a file.//#include <corecrt_internal_lowio.h>#include <corecrt_internal_ptd_propagation.h>
// Closes the underlying OS file handle, if and only if nt needs to be closed.// Returns 0 on success; returns the OS error on failure.static DWORD close_os_handle_nolock(int const fh) throw(){ // If the underlying handle is INVALID_HANDLE_VALUE, don't try to acutally // close it: if (_get_osfhandle(fh) == (intptr_t)INVALID_HANDLE_VALUE) { return 0; }
// If the file handle is stdout or stderr, and if stdout and stderr are // mapped to the same OS file handle, skip the CloseHandle without error. // // stdout and stderr are the only handles for which this support is // provided. Other handles may be mapped to the same OS file handle only // at the programmer's risk. bool is_other_std_handle_open = fh == 1 && (_osfile(2) & FOPEN) || fh == 2 && (_osfile(1) & FOPEN);
if (is_other_std_handle_open && _get_osfhandle(1) == _get_osfhandle(2)) { return 0; }
// Otherwise, we can go ahead and close the handle: if (CloseHandle(reinterpret_cast<HANDLE>(_get_osfhandle(fh)))) { return 0; }
return GetLastError();}
// Closes the file associated with the given file handle. On success, returns 0.// On failure, returns -1 and sets errno.extern "C" int __cdecl _close_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, [&]() { if (_osfile(fh) & FOPEN) { return _close_nolock_internal(fh, ptd); } else { ptd.get_errno().set(EBADF); _ASSERTE(("Invalid file descriptor. File possibly closed by a different thread",0)); return -1; } });}
extern "C" int __cdecl _close(int const fh){ __crt_cached_ptd_host ptd; return _close_internal(fh, ptd);}
extern "C" int __cdecl _close_nolock_internal(int const fh, __crt_cached_ptd_host& ptd){ DWORD const close_os_handle_error = close_os_handle_nolock(fh);
_free_osfhnd(fh); _osfile(fh) = 0;
if (close_os_handle_error != 0) { __acrt_errno_map_os_error_ptd(close_os_handle_error, ptd); return -1; }
return 0;}
extern "C" int __cdecl _close_nolock(int const fh){ __crt_cached_ptd_host ptd; return _close_nolock_internal(fh, ptd);}