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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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.
*/
#include <fcntl.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
// This file provides a wrapper for open.
extern "C" {
int __real_open(const char* pathname, int flags, ...);
static bool needs_mode(int flags) {
return ((flags & O_CREAT) == O_CREAT) || ((flags & O_TMPFILE) == O_TMPFILE);
}
static const char* PROFRAW_START = "/data/misc/trace/";
static bool is_coverage_trace(const char* pathname) {
if (strncmp(pathname, PROFRAW_START, strlen(PROFRAW_START)) == 0) return true;
return false;
}
__attribute__((weak)) int __wrap_open(const char* pathname, int flags, ...) {
if (!needs_mode(flags)) {
return __real_open(pathname, flags);
}
va_list args;
va_start(args, flags);
mode_t mode = static_cast<mode_t>(va_arg(args, int));
va_end(args);
int ret = __real_open(pathname, flags, mode);
if (ret != -1 && is_coverage_trace(pathname)) fchmod(ret, mode);
return ret;
}
}
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