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Add -log_file option to fuzzers #47

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Add -log_file option to fuzzers #47

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11 changes: 11 additions & 0 deletions compiler-rt/lib/fuzzer/FuzzerDriver.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -661,6 +661,17 @@ int FuzzerDriver(int *argc, char ***argv, UserCallback Callback) {
return 0;
}

std::unique_ptr<FILE, int(*)(FILE*)> log_file(0, &fclose);
if (Flags.log_file) {
FILE * f = fopen(Flags.log_file, "w");
if (!f) {
Printf("ERROR: unable to open log_file [%s]: %s\n", Flags.log_file, strerror(errno));
return 1;
}
log_file.reset(f);
SetOutputFile(f);
}

if (Flags.close_fd_mask & 2)
DupAndCloseStderr();
if (Flags.close_fd_mask & 1)
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1 change: 1 addition & 0 deletions compiler-rt/lib/fuzzer/FuzzerFlags.def
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Expand Up @@ -209,3 +209,4 @@ FUZZER_FLAG_STRING(collect_data_flow,
FUZZER_FLAG_INT(create_missing_dirs, 0, "Automatically attempt to create "
"directories for arguments that would normally expect them to already "
"exist (i.e. artifact_prefix, exact_artifact_path, features_dir, corpus)")
FUZZER_FLAG_STRING(log_file, "Output file for fuzzer, default is stderr")