128 lines
3.0 KiB
C++
128 lines
3.0 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "td/utils/port/stacktrace.h"
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#include "td/utils/port/signals.h"
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#if __GLIBC__
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#include <execinfo.h>
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#endif
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#if TD_LINUX || TD_FREEBSD
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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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#if TD_LINUX
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#include <sys/prctl.h>
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#endif
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#endif
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namespace td {
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namespace {
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void print_backtrace(void) {
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#if __GLIBC__
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void *buffer[128];
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int nptrs = backtrace(buffer, 128);
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signal_safe_write("------- Stack Backtrace -------\n", false);
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backtrace_symbols_fd(buffer, nptrs, 2);
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signal_safe_write("-------------------------------\n", false);
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#endif
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}
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void print_backtrace_gdb(void) {
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#if TD_LINUX || TD_FREEBSD
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char pid_buf[30];
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char *pid_buf_begin = pid_buf + sizeof(pid_buf);
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pid_t pid = getpid();
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*--pid_buf_begin = '\0';
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do {
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*--pid_buf_begin = static_cast<char>(pid % 10 + '0');
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pid /= 10;
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} while (pid > 0);
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char name_buf[512];
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ssize_t res = readlink("/proc/self/exe", name_buf, 511); // TODO works only under Linux
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if (res >= 0) {
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name_buf[res] = 0;
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#if TD_LINUX
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#if defined(PR_SET_DUMPABLE)
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if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) < 0) {
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signal_safe_write("Can't set dumpable\n");
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return;
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}
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#endif
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#if defined(PR_SET_PTRACER)
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// We can't use event fd because we are in a signal handler
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int fds[2];
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bool need_set_ptracer = true;
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if (pipe(fds) < 0) {
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need_set_ptracer = false;
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signal_safe_write("Can't create a pipe\n");
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}
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#endif
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#endif
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int child_pid = fork();
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if (child_pid < 0) {
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signal_safe_write("Can't fork() to run gdb\n");
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return;
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}
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if (!child_pid) {
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#if TD_LINUX && defined(PR_SET_PTRACER)
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if (need_set_ptracer) {
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char c;
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if (read(fds[0], &c, 1) < 0) {
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signal_safe_write("Failed to read from pipe\n");
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}
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}
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#endif
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dup2(2, 1); // redirect output to stderr
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execlp("gdb", "gdb", "--batch", "-n", "-ex", "thread", "-ex", "thread apply all bt full", name_buf, pid_buf_begin,
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nullptr);
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return;
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} else {
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#if TD_LINUX && defined(PR_SET_PTRACER)
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if (need_set_ptracer) {
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if (prctl(PR_SET_PTRACER, child_pid, 0, 0, 0) < 0) {
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signal_safe_write("Can't set ptracer\n");
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}
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if (write(fds[1], "a", 1) != 1) {
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signal_safe_write("Can't write to pipe\n");
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}
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}
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#endif
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waitpid(child_pid, nullptr, 0);
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}
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} else {
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signal_safe_write("Can't get name of executable file to pass to gdb\n");
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}
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#endif
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}
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} // namespace
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void Stacktrace::print_to_stderr(const PrintOptions &options) {
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print_backtrace();
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if (options.use_gdb) {
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print_backtrace_gdb();
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}
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}
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void Stacktrace::init() {
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#if __GLIBC__
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// backtrace needs to be called once to ensure that next calls are async-signal-safe
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void *buffer[1];
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backtrace(buffer, 1);
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#endif
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}
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} // namespace td
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