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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
#include "port/stack_trace.h"
#if defined(ROCKSDB_LITE) || \
!(defined(ROCKSDB_BACKTRACE) || defined(OS_MACOSX)) || defined(CYGWIN) || \
defined(OS_SOLARIS) || defined(OS_WIN)
// noop
namespace ROCKSDB_NAMESPACE {
namespace port {
void InstallStackTraceHandler() {}
void PrintStack(int /*first_frames_to_skip*/) {}
void PrintAndFreeStack(void* /*callstack*/, int /*num_frames*/) {}
void* SaveStack(int* /*num_frames*/, int /*first_frames_to_skip*/) {
return nullptr;
}
} // namespace port
} // namespace ROCKSDB_NAMESPACE
#else
#include <cxxabi.h>
#include <execinfo.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if defined(OS_FREEBSD)
#include <sys/sysctl.h>
#endif
#ifdef OS_LINUX
#include <sys/prctl.h>
#endif
#include "port/lang.h"
namespace ROCKSDB_NAMESPACE {
namespace port {
namespace {
#if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_GNU_KFREEBSD)
const char* GetExecutableName() {
static char name[1024];
#if !defined(OS_FREEBSD)
char link[1024];
snprintf(link, sizeof(link), "/proc/%d/exe", getpid());
auto read = readlink(link, name, sizeof(name) - 1);
if (-1 == read) {
return nullptr;
} else {
name[read] = 0;
return name;
}
#else
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
size_t namesz = sizeof(name);
auto ret = sysctl(mib, 4, name, &namesz, nullptr, 0);
if (-1 == ret) {
return nullptr;
} else {
return name;
}
#endif
}
void PrintStackTraceLine(const char* symbol, void* frame) {
static const char* executable = GetExecutableName();
if (symbol) {
fprintf(stderr, "%s ", symbol);
}
if (executable) {
// out source to addr2line, for the address translation
const int kLineMax = 256;
char cmd[kLineMax];
snprintf(cmd, kLineMax, "addr2line %p -e %s -f -C 2>&1", frame, executable);
auto f = popen(cmd, "r");
if (f) {
char line[kLineMax];
while (fgets(line, sizeof(line), f)) {
line[strlen(line) - 1] = 0; // remove newline
fprintf(stderr, "%s\t", line);
}
pclose(f);
}
} else {
fprintf(stderr, " %p", frame);
}
fprintf(stderr, "\n");
}
#elif defined(OS_MACOSX)
void PrintStackTraceLine(const char* symbol, void* frame) {
static int pid = getpid();
// out source to atos, for the address translation
const int kLineMax = 256;
char cmd[kLineMax];
snprintf(cmd, kLineMax, "xcrun atos %p -p %d 2>&1", frame, pid);
auto f = popen(cmd, "r");
if (f) {
char line[kLineMax];
while (fgets(line, sizeof(line), f)) {
line[strlen(line) - 1] = 0; // remove newline
fprintf(stderr, "%s\t", line);
}
pclose(f);
} else if (symbol) {
fprintf(stderr, "%s ", symbol);
}
fprintf(stderr, "\n");
}
#endif
} // namespace
void PrintStack(void* frames[], int num_frames) {
auto symbols = backtrace_symbols(frames, num_frames);
for (int i = 0; i < num_frames; ++i) {
fprintf(stderr, "#%-2d ", i);
PrintStackTraceLine((symbols != nullptr) ? symbols[i] : nullptr, frames[i]);
}
free(symbols);
}
void PrintStack(int first_frames_to_skip) {
const int kMaxFrames = 100;
void* frames[kMaxFrames];
auto num_frames = backtrace(frames, kMaxFrames);
PrintStack(&frames[first_frames_to_skip], num_frames - first_frames_to_skip);
}
void PrintAndFreeStack(void* callstack, int num_frames) {
PrintStack(static_cast<void**>(callstack), num_frames);
free(callstack);
}
void* SaveStack(int* num_frames, int first_frames_to_skip) {
const int kMaxFrames = 100;
void* frames[kMaxFrames];
auto count = backtrace(frames, kMaxFrames);
*num_frames = count - first_frames_to_skip;
void* callstack = malloc(sizeof(void*) * *num_frames);
memcpy(callstack, &frames[first_frames_to_skip], sizeof(void*) * *num_frames);
return callstack;
}
static void StackTraceHandler(int sig) {
// reset to default handler
signal(sig, SIG_DFL);
fprintf(stderr, "Received signal %d (%s)\n", sig, strsignal(sig));
// skip the top three signal handler related frames
PrintStack(3);
// Efforts to fix or suppress TSAN warnings "signal-unsafe call inside of
// a signal" have failed, so just warn the user about them.
#ifdef __SANITIZE_THREAD__
fprintf(stderr,
"==> NOTE: any above warnings about \"signal-unsafe call\" are\n"
"==> ignorable, as they are expected when generating a stack\n"
"==> trace because of a signal under TSAN. Consider why the\n"
"==> signal was generated to begin with, and the stack trace\n"
"==> in the TSAN warning can be useful for that. (The stack\n"
"==> trace printed by the signal handler is likely obscured\n"
"==> by TSAN output.)\n");
#endif
// re-signal to default handler (so we still get core dump if needed...)
raise(sig);
}
void InstallStackTraceHandler() {
// just use the plain old signal as it's simple and sufficient
// for this use case
signal(SIGILL, StackTraceHandler);
signal(SIGSEGV, StackTraceHandler);
signal(SIGBUS, StackTraceHandler);
signal(SIGABRT, StackTraceHandler);
// Allow ouside debugger to attach, even with Yama security restrictions
#ifdef PR_SET_PTRACER_ANY
(void)prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0);
#endif
}
} // namespace port
} // namespace ROCKSDB_NAMESPACE
#endif
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