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//===-- sanitizer_file.cc ------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===---------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries. It defines filesystem-related interfaces. This
// is separate from sanitizer_common.cc so that it's simpler to disable
// all the filesystem support code for a port that doesn't use it.
//
//===---------------------------------------------------------------------===//
#include "sanitizer_platform.h"
#if !SANITIZER_FUCHSIA
#include "sanitizer_common.h"
#include "sanitizer_file.h"
namespace __sanitizer {
void CatastrophicErrorWrite(const char *buffer, uptr length) {
WriteToFile(kStderrFd, buffer, length);
}
StaticSpinMutex report_file_mu;
ReportFile report_file = {&report_file_mu, kStderrFd, "", "", 0};
void RawWrite(const char *buffer) {
report_file.Write(buffer, internal_strlen(buffer));
}
void ReportFile::ReopenIfNecessary() {
mu->CheckLocked();
if (fd == kStdoutFd || fd == kStderrFd) return;
uptr pid = internal_getpid();
// If in tracer, use the parent's file.
if (pid == stoptheworld_tracer_pid)
pid = stoptheworld_tracer_ppid;
if (fd != kInvalidFd) {
// If the report file is already opened by the current process,
// do nothing. Otherwise the report file was opened by the parent
// process, close it now.
if (fd_pid == pid)
return;
else
CloseFile(fd);
}
const char *exe_name = GetProcessName();
if (common_flags()->log_exe_name && exe_name) {
internal_snprintf(full_path, kMaxPathLength, "%s.%s.%zu", path_prefix,
exe_name, pid);
} else {
internal_snprintf(full_path, kMaxPathLength, "%s.%zu", path_prefix, pid);
}
fd = OpenFile(full_path, WrOnly);
if (fd == kInvalidFd) {
const char *ErrorMsgPrefix = "ERROR: Can't open file: ";
WriteToFile(kStderrFd, ErrorMsgPrefix, internal_strlen(ErrorMsgPrefix));
WriteToFile(kStderrFd, full_path, internal_strlen(full_path));
Die();
}
fd_pid = pid;
}
void ReportFile::SetReportPath(const char *path) {
if (!path)
return;
uptr len = internal_strlen(path);
if (len > sizeof(path_prefix) - 100) {
Report("ERROR: Path is too long: %c%c%c%c%c%c%c%c...\n",
path[0], path[1], path[2], path[3],
path[4], path[5], path[6], path[7]);
Die();
}
SpinMutexLock l(mu);
if (fd != kStdoutFd && fd != kStderrFd && fd != kInvalidFd)
CloseFile(fd);
fd = kInvalidFd;
if (internal_strcmp(path, "stdout") == 0) {
fd = kStdoutFd;
} else if (internal_strcmp(path, "stderr") == 0) {
fd = kStderrFd;
} else {
internal_snprintf(path_prefix, kMaxPathLength, "%s", path);
}
}
bool ReadFileToBuffer(const char *file_name, char **buff, uptr *buff_size,
uptr *read_len, uptr max_len, error_t *errno_p) {
uptr PageSize = GetPageSizeCached();
uptr kMinFileLen = PageSize;
*buff = nullptr;
*buff_size = 0;
*read_len = 0;
// The files we usually open are not seekable, so try different buffer sizes.
for (uptr size = kMinFileLen; size <= max_len; size *= 2) {
fd_t fd = OpenFile(file_name, RdOnly, errno_p);
if (fd == kInvalidFd) return false;
UnmapOrDie(*buff, *buff_size);
*buff = (char*)MmapOrDie(size, __func__);
*buff_size = size;
*read_len = 0;
// Read up to one page at a time.
bool reached_eof = false;
while (*read_len + PageSize <= size) {
uptr just_read;
if (!ReadFromFile(fd, *buff + *read_len, PageSize, &just_read, errno_p)) {
UnmapOrDie(*buff, *buff_size);
return false;
}
if (just_read == 0) {
reached_eof = true;
break;
}
*read_len += just_read;
}
CloseFile(fd);
if (reached_eof) // We've read the whole file.
break;
}
return true;
}
static const char kPathSeparator = SANITIZER_WINDOWS ? ';' : ':';
char *FindPathToBinary(const char *name) {
if (FileExists(name)) {
return internal_strdup(name);
}
const char *path = GetEnv("PATH");
if (!path)
return nullptr;
uptr name_len = internal_strlen(name);
InternalScopedBuffer<char> buffer(kMaxPathLength);
const char *beg = path;
while (true) {
const char *end = internal_strchrnul(beg, kPathSeparator);
uptr prefix_len = end - beg;
if (prefix_len + name_len + 2 <= kMaxPathLength) {
internal_memcpy(buffer.data(), beg, prefix_len);
buffer[prefix_len] = '/';
internal_memcpy(&buffer[prefix_len + 1], name, name_len);
buffer[prefix_len + 1 + name_len] = '\0';
if (FileExists(buffer.data()))
return internal_strdup(buffer.data());
}
if (*end == '\0') break;
beg = end + 1;
}
return nullptr;
}
} // namespace __sanitizer
using namespace __sanitizer; // NOLINT
extern "C" {
void __sanitizer_set_report_path(const char *path) {
report_file.SetReportPath(path);
}
void __sanitizer_set_report_fd(void *fd) {
report_file.fd = (fd_t)reinterpret_cast<uptr>(fd);
report_file.fd_pid = internal_getpid();
}
} // extern "C"
#endif // !SANITIZER_FUCHSIA
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