e5b603a4c3
Summary:
This commit moves the `DiscardOutput` function in FuzzerIO to
FuzzerUtil, so fuchsia can have its own specialized version.
In fuchsia, accessing `/dev/null` is not supported, and there's nothing
similar to a file that discards everything that is written to it. The
way of doing something similar in fuchsia is by using `fdio_null_create`
and binding that to a file descriptor with `fdio_bind_to_fd`.
This change should fix one of the issues with the `-close_fd_mask` flag
in libfuzzer, in which closing stdout was not working due to
`fopen("/dev/null", "w")` returning `NULL`.
Reviewers: kcc, aarongreen
Subscribers: #sanitizers, llvm-commits
Tags: #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D69593
42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
//===- FuzzerUtilLinux.cpp - Misc utils for Linux. ------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Misc utils for Linux.
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//===----------------------------------------------------------------------===//
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#include "FuzzerDefs.h"
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#if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD || \
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LIBFUZZER_OPENBSD
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#include "FuzzerCommand.h"
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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namespace fuzzer {
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int ExecuteCommand(const Command &Cmd) {
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std::string CmdLine = Cmd.toString();
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int exit_code = system(CmdLine.c_str());
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if (WIFEXITED(exit_code))
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return WEXITSTATUS(exit_code);
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return exit_code;
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}
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void DiscardOutput(int Fd) {
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FILE* Temp = fopen("/dev/null", "w");
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if (!Temp)
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return;
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dup2(fileno(Temp), Fd);
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fclose(Temp);
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}
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} // namespace fuzzer
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#endif
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