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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2022 The Fluent Bit Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef FLB_IN_EXEC_WIN32_COMPAT_H
#define FLB_IN_EXEC_WIN32_COMPAT_H
#include <stdio.h>
#include <fluent-bit/flb_info.h>
/*
* Work around lack of sys/wait.h and POSIX exit status macros from waitpid()
* in win32's _popen() and _pclose() implementation, since fluent-bit uses
* these in the in_exec plugin.
*
* On POSIX-like OSes this'll just use the standard macros with a name alias.
*
* On windows, where the concept of a signal exit does not exist, it defines
* dummy macros to indicate that the process exited normally and extract the
* exit code.
*
* These macros are for use with flb_pclose() only. Do not use them with
* other APIs that may differ in return value semantics.
*/
#ifdef FLB_HAVE_SYS_WAIT_H
#include <sys/wait.h>
#define FLB_WIFEXITED(status) WIFEXITED((status))
#define FLB_WEXITSTATUS(status) WEXITSTATUS((status))
#define FLB_WIFSIGNALED(status) WIFSIGNALED((status))
#define FLB_WTERMSIG(status) WTERMSIG((status))
#else
#define FLB_WIFEXITED(status) (1)
#define FLB_WEXITSTATUS(status) ((status) & 0x00ff)
#define FLB_WIFSIGNALED(status) (0)
#define FLB_WTERMSIG(status) (-1)
#endif
/*
* Because Windows has to do everything differently, call _popen() and
* _pclose() instead of the POSIX popen() and pclose() functions.
*
* flb_pclose() has different return value semantics on Windows vs non-windows
* targets because it propagates the pclose() or _pclose() return value
* directly. You MUST use the FLB_WIFEXITED(), FLB_WEXITSTATUS(),
* FLB_WIFSIGNALED() and FLB_WTERMSIG() macros to consume the return value,
* rather than the underlying POSIX macros or manual bit-shifts.
*/
#if !defined(FLB_SYSTEM_WINDOWS)
static inline FILE* flb_popen(const char *command, const char *type) {
return popen(command, type);
}
static inline int flb_pclose(FILE *stream) {
return pclose(stream);
}
#define FLB_PCLOSE pclose
#else
static inline FILE* flb_popen(const char *command, const char *type) {
return _popen(command, type);
}
/*
* flb_pclose() has the same return value on Windows as win32 _pclose(), rather
* than posix pclose(). The process exit code is not bit-shifted to the high
* byte.
*
* The MSVC docs for _pclose() at
* https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/pclose?view=msvc-170
* are misleading; they say that "The format of the return value is the same as
* for _cwait, except the low-order and high-order bytes are swapped." But
* _cwait isn't documented as having any meaningful return on success, the
* process exit code is meant to be in its "termstat" out parameter per
* https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/cwait?view=msvc-170
* The return code of _pclose() actually appears to be the process exit code
* without the bit-shift that waitpid() applies.
*/
static inline int flb_pclose(FILE *stream) {
return _pclose(stream);
}
#endif
#endif /* FLB_IN_EXEC_WIN32_COMPAT_H */
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