util.h

/*

   nsjail - useful procedures
   -----------------------------------------

   Copyright 2016 Google Inc. All Rights Reserved.

   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 NS_UTIL_H
#define NS_UTIL_H

#include <inttypes.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/resource.h>

#include <string>
#include <vector>

#include "nsjail.h"

#define RETURN_ON_FAILURE(expr)                                                                    \
	do {                                                                                       \
		if (!(expr)) {                                                                     \
			return false;                                                              \
		}                                                                                  \
	} while (0)

#define QC(x) (util::StrQuote(x).c_str())

#if !defined(RLIM64_INFINITY)
#define RLIM64_INFINITY (~0ULL)
struct rlimit64 {
	uint64_t rlim_cur;
	uint64_t rlim_max;
};
#endif /* !defined(RLIM64_INFINITY) */

namespace util {

ssize_t readFromFd(int fd, void* buf, size_t len);
ssize_t readFromFile(const char* fname, void* buf, size_t len);
bool readFromFileToStr(const char* fname, std::string* str);
bool writeToFd(int fd, const void* buf, size_t len);
bool writeBufToFile(
    const char* filename, const void* buf, size_t len, int open_flags, bool log_errors = true);
bool createDirRecursively(const char* dir);
std::string* StrAppend(std::string* str, const char* format, ...)
    __attribute__((format(printf, 2, 3)));
std::string StrPrintf(const char* format, ...) __attribute__((format(printf, 1, 2)));
const std::string StrQuote(const std::string& str);
bool StrEq(const std::string_view& s1, const std::string_view& s2);
bool isANumber(const char* s);
uint64_t rnd64(void);
const std::string sigName(int signo);
const std::string rLimName(int res);
const std::string timeToStr(time_t t);
std::vector<std::string> strSplit(const std::string str, char delim);
long syscall(long sysno, uintptr_t a0 = 0, uintptr_t a1 = 0, uintptr_t a2 = 0, uintptr_t a3 = 0,
    uintptr_t a4 = 0, uintptr_t a5 = 0);
long setrlimit(int res, const struct rlimit64& newlim);
long getrlimit(int res, struct rlimit64* curlim);

}  // namespace util

#endif /* NS_UTIL_H */