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72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
/***
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*perror.c - print system error message
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*
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* Copyright (c) Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines perror() - print system error message
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* System error message are indexed by errno; conforms to XENIX
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* standard, with much compatability with 1983 uniforum draft standard.
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*
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*******************************************************************************/
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#include <corecrt_internal.h>
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#include <corecrt_internal_lowio.h>
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#include <corecrt_internal_ptd_propagation.h>
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#include <io.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#pragma warning(disable:__WARNING_RETVAL_IGNORED_FUNC_COULD_FAIL) // 6031 return value ignored
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/***
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*void perror(message) - print system error message
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*
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*Purpose:
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* prints user's error message, then follows it with ": ", then the system
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* error message, then a newline. All output goes to stderr. If user's
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* message is nullptr or a null string, only the system error message is
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* printer. If errno is weird, prints "Unknown error".
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*
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*Entry:
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* const char *message - users message to prefix system error message
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*
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*Exit:
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* Prints message; no return value.
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*
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*Exceptions:
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*
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*******************************************************************************/
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static void __cdecl _perror_internal(char const* const user_prefix, __crt_cached_ptd_host& ptd)
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{
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int const fh = 2;
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__acrt_lowio_lock_fh(fh);
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__try
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{
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if (user_prefix != nullptr && user_prefix[0] != '\0')
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{
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_write_nolock(fh, user_prefix, static_cast<unsigned>(strlen(user_prefix)), ptd);
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_write_nolock(fh, ": ", 2, ptd);
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}
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// Use PTD directly to access previously set errno value.
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char const* const system_message = _get_sys_err_msg(ptd.get_raw_ptd()->_terrno);
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_write_nolock(fh, system_message, static_cast<unsigned>(strlen(system_message)), ptd);
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_write_nolock(fh, "\n", 1, ptd);
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}
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__finally
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{
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__acrt_lowio_unlock_fh( fh );
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}
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__endtry
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}
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extern "C" void __cdecl perror(char const* const user_prefix)
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{
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__crt_cached_ptd_host ptd;
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return _perror_internal(user_prefix, ptd);
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}
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