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quickstack.cc
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#include "quickstack.h"
#include <linux/version.h>
#include <asm/unistd.h>
#include <getopt.h>
#include <sys/mman.h>
#include <sstream>
#if defined(__i386__)
#define STACK_IP eip
#define STACK_SP esp
#elif defined(__x86_64__)
#define STACK_IP rip
#define STACK_SP rsp
#else
#error "unsupported cpu arch"
#endif
#if !defined(__linux__)
#error "unsupported os"
#endif
const char* version = "0.10";
int target_pid = 0;
int debug_level = 2;
int debug_print_time_level = 10;
int frame_check = 0;
int flush_log = 3;
int timeout_seconds = 600;
bool lock_all = false;
const char* debug_dir = "/usr/lib/debug";
int* _attach_started = nullptr;
stopper_symbol stopper[3] = {
{"main", 0, 0}, {"start_thread", 0, 0}, {"do_sigwait", 0, 0}};
int num_stopper_symbol = 3;
string basic_libs[10] = {"ld-",
"libaio.",
"libc-",
"libm-",
"libdl-",
"libpthread-",
"librt-",
"libgcc_",
"libcrypt-",
"libnss_"
"libnsl_"
"libstdc++"};
int num_basic_libs = 10;
volatile sig_atomic_t shutdown_program = 0;
int print_arg = 0;
int single_line = 0;
int thread_names = 0;
int trace_multiple_procs = 0;
int basename_only = 0;
int max_ptrace_calls = 1000;
int max_frame_size = 16384 * sizeof(long);
const char* stack_out;
FILE* stack_out_fp;
static void set_shutdown(int) { shutdown_program = 1; }
static void init_signals() {
int signals[] = {SIGHUP, SIGINT, SIGTERM};
for (uint i = 0; i < sizeof(signals) / sizeof(int); i++)
signal(signals[i], set_shutdown);
return;
}
static void ignore_signals() {
int signals[] = {SIGHUP, SIGINT, SIGTERM};
for (uint i = 0; i < sizeof(signals) / sizeof(int); i++)
signal(signals[i], SIG_IGN);
return;
}
void print_log(int level, const char* format, ...) {
if (level < debug_print_time_level) {
struct timeval tv;
time_t tt;
struct tm *tm;
gettimeofday(&tv, 0);
tt = tv.tv_sec;
tm = localtime(&tt);
fprintf(stdout,
"%04d-%02d-%02d %02d:%02d:%02d %06ld: ",
tm->tm_year + 1900,
tm->tm_mon + 1,
tm->tm_mday,
tm->tm_hour,
tm->tm_min,
tm->tm_sec,
tv.tv_usec);
} else {
fprintf(stdout, " ");
}
va_list args;
va_start(args, format);
vfprintf(stdout, format, args);
va_end(args);
fprintf(stdout, "\n");
if (flush_log >= level)
fflush(stdout);
}
void print_stack(const char* format, ...) {
va_list args;
va_start(args, format);
if (stack_out_fp) {
vfprintf(stack_out_fp, format, args);
fflush(stack_out_fp);
} else {
vfprintf(stdout, format, args);
fflush(stdout);
}
va_end(args);
}
static string dirname(const string& path) {
return path.substr(0, path.find_last_of('/'));
}
static string basename(const string& path) {
return path.substr(path.find_last_of('/') + 1);
}
static bool startwith(const string& fullstring, const string& starting) {
if (fullstring.length() >= starting.length()) {
if (!fullstring.compare(0, starting.length(), starting))
return true;
} else {
return false;
}
return false;
}
static bool endwith(const string& fullstring, const string& ending) {
if (fullstring.length() >= ending.length()) {
return (0 ==
fullstring.compare(fullstring.length() - ending.length(),
ending.length(),
ending));
} else {
return false;
}
return false;
}
static int is_pid_stopped(int pid) {
FILE* status_file;
char buf[100];
int retval = 0;
snprintf(buf, sizeof(buf), "/proc/%d/status", (int)pid);
status_file = fopen(buf, "r");
if (status_file != NULL) {
int have_state = 0;
while (fgets(buf, sizeof(buf), status_file)) {
buf[strlen(buf) - 1] = '\0';
if (strncmp(buf, "State:", 6) == 0) {
have_state = 1;
break;
}
}
if (have_state && strstr(buf, "T") != NULL) {
DBG(9, "Process %d %s", pid, buf);
retval = 1;
}
fclose(status_file);
}
return retval;
}
static bool match_debug_file(const string& name, const char* file) {
string ptr = file;
string ending = ".debug";
if (name.empty() || ptr.empty())
return false;
if (!startwith(ptr, name))
return false;
if (name.length() == ptr.length())
return true;
ptr = ptr.substr(name.length());
if (!endwith(ptr, ending))
return false;
ptr = ptr.substr(0, ptr.length() - ending.length());
char* work = (char*)ptr.c_str();
while (*work) {
if ((*work >= 0 && *work <= 9) || *work == '.')
work++;
else
return false;
}
return true;
}
static int get_user_regs(int pid, user_regs_struct& regs) {
int count = 100;
while (1) {
int e = ptrace(PTRACE_GETREGS, pid, 0, ®s);
if (e != 0) {
if (errno == ESRCH && count-- > 0) {
sched_yield();
continue;
}
perror("ptrace(PTRACE_GETREGS)");
return -1;
}
break;
}
return 0;
}
static char* find_debug_file(const char* stripped_file) {
string path;
path = debug_dir;
path += stripped_file;
string dirname1 = dirname(path);
string name = basename(path);
string real_debug_file;
DIR* dp = opendir(dirname1.c_str());
if (dp) {
struct dirent* dent;
do {
dent = readdir(dp);
if (dent) {
if (dent->d_name[0] == '.') {
continue;
}
if (match_debug_file(name, dent->d_name)) {
real_debug_file = dirname1;
real_debug_file += "/";
real_debug_file += dent->d_name;
break;
}
}
} while (dent);
closedir(dp);
}
return strdup(real_debug_file.c_str());
}
void bfd_handle::free_syms_if() {
if (syms != NULL) {
free(syms);
syms = NULL;
}
}
void bfd_handle::free_st_if() {
if (st != NULL) {
delete st;
st = NULL;
}
}
bool bfd_handle::has_debug() { return has_debug_symbols; }
int bfd_handle::get_file_line(ulong addr,
const char** file,
const char** function,
uint* lineno) {
return bfd_find_nearest_line(
abfd, dbgsec, syms, addr - 1, file, function, lineno);
}
void bfd_handle::close_all() {
free_st_if();
free_syms_if();
close();
if (debug_file)
free(debug_file);
}
void bfd_handle::init(const char* file = nullptr) {
abfd = bfd_openr(file ? file : filename, NULL);
if (!abfd) {
fprintf(stderr, "Failed at bfd_openr! %s\n", file ? file : filename);
exit(1);
}
bfd_check_format(abfd, bfd_object);
assert((bfd_get_file_flags(abfd) & HAS_SYMS) != 0);
}
void bfd_handle::debug_init() {
close();
init(debug_file);
}
bfd* bfd_handle::get() { return abfd; }
void bfd_handle::close() {
if (abfd)
bfd_close(abfd);
abfd = NULL;
}
void load_stopper_symbols(symbol_table* sorted_st,
bool relative,
ulong addr_begin) {
int matched_stopper = -1;
for (symbol_table::symbols_type::iterator i = sorted_st->symbols.begin();
i != sorted_st->symbols.end();
i++) {
int j = 0;
if (matched_stopper >= 0) {
stopper[matched_stopper].addr_end = i->addr;
if (relative) {
stopper[matched_stopper].addr_end += addr_begin;
}
matched_stopper = -1;
}
for (j = 0; j < num_stopper_symbol; j++) {
if (stopper[j].name == i->name) {
stopper[j].addr_begin = i->addr;
if (relative) {
stopper[j].addr_begin += addr_begin;
}
matched_stopper = j;
}
}
}
}
void bfd_handle::load_symbols(bool relative, ulong addr_begin) {
st = new symbol_table();
load_debug_section_if();
asection* const text_sec = bfd_get_section_by_name(abfd, ".text");
if (text_sec) {
st->text_vma = text_sec->vma;
st->text_size = text_sec->size;
}
symcnt = bfd_read_minisymbols(abfd, 0, (void**)&syms, &size);
if (!symcnt) {
free_syms_if();
symcnt = bfd_read_minisymbols(abfd, 1, (void**)&syms, &size);
dynamic = 1;
}
asymbol* store = bfd_make_empty_symbol(abfd);
assert(store);
bfd_byte* p = (bfd_byte*)syms;
bfd_byte* pend = p + symcnt * size;
for (; p < pend; p += size) {
asymbol* sym = bfd_minisymbol_to_symbol(abfd, dynamic, p, store);
if ((sym->flags & BSF_FUNCTION) == 0) {
continue;
}
symbol_info sinfo;
bfd_get_symbol_info(abfd, sym, &sinfo);
if (sinfo.type != 'T' && sinfo.type != 't' && sinfo.type != 'W' &&
sinfo.type != 'w') {
continue;
}
DBG(40, "%s %lx f=%x", sinfo.name, (long)sinfo.value, (int)sym->flags);
if (startwith(sinfo.name, "__tcf"))
continue;
if (startwith(sinfo.name, "__tz"))
continue;
symbol_ent e;
e.addr = sinfo.value;
e.name = string(sinfo.name);
st->symbols.push_back(e);
}
std::sort(st->symbols.begin(), st->symbols.end(), std::less<symbol_ent>());
load_stopper_symbols(st, relative, addr_begin);
}
void bfd_handle::load_debug_section_if() {
dbgsec = bfd_get_section_by_name(abfd, ".debug_info");
if (!dbgsec) {
debug_file = find_debug_file(filename);
if (debug_file && strlen(debug_file) > 0) {
DBG(3, "Reading debug file %s, original(%s) ..", debug_file, filename);
debug_init();
dbgsec = bfd_get_section_by_name(abfd, ".debug_info");
}
}
if (dbgsec) {
DBG(3, "has debug symbols on %s", debug_file ? debug_file : filename);
has_debug_symbols = true;
} else {
DBG(1, "No debug symbols found on %s", filename);
has_debug_symbols = false;
}
}
static bool check_shlib(const std::string& fn) {
auto_fp fp(fopen(fn.c_str(), "r"));
if (fp == 0) {
return false;
}
elf_version(EV_CURRENT);
Elf* elf = elf_begin(fileno(fp), ELF_C_READ, nullptr);
if (elf == 0) {
return false;
}
ulong vaddr = 0;
#if defined(__i386__)
Elf32_Ehdr* const ehdr = elf32_getehdr(elf);
Elf32_Phdr* const phdr = elf32_getphdr(elf);
#else
Elf64_Ehdr* const ehdr = elf64_getehdr(elf);
Elf64_Phdr* const phdr = elf64_getphdr(elf);
#endif
const int num_phdr = ehdr->e_phnum;
for (int i = 0; i < num_phdr; ++i) {
#if defined(__i386__)
Elf32_Phdr* const p = phdr + i;
#else
Elf64_Phdr* const p = phdr + i;
#endif
if (p->p_type == PT_LOAD && (p->p_flags & 1) != 0) {
vaddr = p->p_vaddr;
break;
}
}
elf_end(elf);
return vaddr == 0;
}
static bool file_exists(const char* filename) {
if (FILE* file = fopen(filename, "r")) {
fclose(file);
return true;
}
return false;
}
static bool has_exec_permission(const char* filename) {
struct stat results;
stat(filename, &results);
if (results.st_mode & S_IXUSR)
return true;
return false;
}
static void read_proc_map_ent(const string& line,
proc_info& pinfo,
symbol_table_map* stmap) {
bool delete_marked = false;
std::istringstream line_sin(line);
string tok;
vector<string> tokens;
while (line_sin >> tok) {
tokens.push_back(tok);
}
if (tokens.size() < 6) {
return;
} else if (tokens.size() > 6 && startwith(tokens[6], "(deleted")) {
delete_marked = true;
}
const string& perms = tokens[1];
if (perms.size() == 5 && perms[3] != 'x') {
return;
}
ulong a0 = 0, a1 = 0;
sscanf(line.c_str(), "%lx-%lx", &a0, &a1);
proc_map_ent e;
e.addr_begin = a0;
e.addr_size = a1 - a0;
e.offset = std::stol(tokens[2], nullptr, 16);
e.path = tokens[5];
if (e.path.empty()) {
return;
} else if (e.path == "[vdso]") {
e.is_vdso = true;
} else if (startwith(e.path, "[")) {
return;
} else {
if (delete_marked && !file_exists(e.path.c_str()))
return;
if (!has_exec_permission(e.path.c_str()))
return;
e.stbl = stmap->get(e.path.c_str());
e.relative = check_shlib(e.path);
if (!e.stbl) {
bfd_handle* bh = new bfd_handle(e.path.c_str());
bh->init();
bh->load_symbols(e.relative, e.addr_begin);
stmap->set(e.path.c_str(), bh->st);
e.stbl = bh->st;
e.stbl->bh = bh;
}
}
DBG(10,
"%s: relative=%d addr_begin=%016lx",
e.path.c_str(),
(int)e.relative,
e.addr_begin);
pinfo.maps.push_back(e);
}
static void read_proc_maps(int pid, proc_info& pinfo, symbol_table_map* stmap) {
const string maps_file_path = "/proc/" + std::to_string(pid) + "/maps";
std::ifstream maps_file(maps_file_path);
if (!maps_file.is_open()) {
return;
}
string line;
while (std::getline(maps_file, line)) {
read_proc_map_ent(line, pinfo, stmap);
}
std::sort(pinfo.maps.begin(), pinfo.maps.end(), std::less<proc_map_ent>());
}
static const symbol_ent* find_symbol(const symbol_table* st,
ulong addr,
bool& is_text_r,
ulong& pos_r,
ulong& offset_r) {
is_text_r = false;
pos_r = 0;
offset_r = 0;
const symbol_table::symbols_type& ss = st->symbols;
symbol_table::symbols_type::const_iterator j =
std::upper_bound(ss.begin(), ss.end(), symbol_ent(addr));
if (j != ss.begin()) {
--j;
} else {
return 0;
}
if (j == ss.end()) {
return 0;
}
is_text_r =
(j->addr >= st->text_vma && j->addr < st->text_vma + st->text_size);
pos_r = j - ss.begin();
offset_r = addr - j->addr;
return &*j;
}
static bool match_basic_lib(const string& path) {
for (int i = 0; i < num_basic_libs; i++) {
if (startwith(basename(path), basic_libs[i])) {
return true;
}
}
return false;
}
static int pinfo_symbol_exists(const proc_info& pinfo, ulong addr) {
/* 0: not exists, 1: core library, 2: others */
int symbol_type = 0;
proc_info::maps_type::const_iterator i = std::upper_bound(
pinfo.maps.begin(), pinfo.maps.end(), proc_map_ent(addr));
if (i != pinfo.maps.begin()) {
--i;
} else {
i = pinfo.maps.end();
}
if (i == pinfo.maps.end()) {
DBG(30, "%lx not found", addr);
} else if (addr >= i->addr_begin + i->addr_size) {
DBG(30,
"%lx out of range [%lx %lx]",
addr,
i->addr_begin,
i->addr_begin + i->addr_size);
} else if (!i->stbl || !i->stbl->bh) {
DBG(30, "%lx no symbol found", addr);
} else {
symbol_type = 2;
if (match_basic_lib(i->path)) {
symbol_type = 1;
DBG(10, "Matched basic libs %s", i->path.c_str());
}
}
return symbol_type;
}
static const symbol_ent* pinfo_find_symbol(const proc_info& pinfo,
ulong addr,
ulong& offset_r,
bfd_handle** bh_ptr,
ulong& relative_addr,
bool ignore_basic_libs = false) {
offset_r = 0;
proc_info::maps_type::const_iterator i =
std::upper_bound(pinfo.maps.begin(), pinfo.maps.end(), addr);
if (i != pinfo.maps.begin()) {
--i;
} else {
i = pinfo.maps.end();
}
if (i == pinfo.maps.end()) {
DBG(30, "%lx not found", addr);
} else if (addr >= i->addr_begin + i->addr_size) {
DBG(30,
"%lx out of range [%lx %lx]",
addr,
i->addr_begin,
i->addr_begin + i->addr_size);
} else if (!i->stbl || !i->stbl->bh) {
DBG(30, "%lx no symbol found", addr);
if (i->is_vdso) {
offset_r = addr - i->addr_begin;
}
} else {
if (ignore_basic_libs) {
if (match_basic_lib(i->path)) {
DBG(10, "Matched basic libs2 %s", i->path.c_str());
return nullptr;
}
}
ulong a = addr;
if (i->relative) {
a -= i->addr_begin;
relative_addr = a;
}
ulong pos = 0;
ulong offset = 0;
bool is_text = false;
const symbol_ent* const e = find_symbol(i->stbl, a, is_text, pos, offset);
*bh_ptr = i->stbl->bh;
if (e != 0 && is_text) {
offset_r = offset;
return e;
} else {
}
}
return nullptr;
}
static bool is_stopper_addr(ulong addr) {
bool is_stopper = false;
int i;
for (i = 0; i < num_stopper_symbol; i++) {
if (stopper[i].addr_begin < addr && stopper[i].addr_end > addr) {
is_stopper = true;
break;
}
}
return is_stopper;
}
static int get_stack_trace(int pid,
proc_info& pinfo,
uint maxlen,
const user_regs_struct& regs,
std::vector<ulong>& vals_r) {
uint i = 0;
// candidate for the next stack address
ulong next_likely_sp = 0;
// address to start re-scanning if getting invalid addresses
ulong rollback_addr = 0;
bool matched_top_sp = false;
uint error_count = 0;
uint n_frames = 0;
uint n_scanned = 0;
bool top_addr_is_user_func = 0;
uint n_scanned_from_last_frame = 0;
bool sp_jumped = false;
ulong sp = regs.STACK_SP;
ulong top_addr = regs.STACK_IP;
ulong top_sp = sp;
// needs special care for second addr
ulong second_addr = 0;
DBG(10, "Top addr %016lx", top_addr);
DBG(10, "Top sp: %016lx", sp);
vals_r.push_back(top_addr);
n_frames++;
if (is_stopper_addr(top_addr)) {
DBG(3, "Matched stopper func.", 0);
return 0;
}
if (pinfo_symbol_exists(pinfo, top_addr) == 2) {
DBG(10, "Top addr is user func.", "");
top_addr_is_user_func = true;
}
for (i = 0; i < maxlen; ++i) {
ulong retaddr = 0;
retaddr = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
if (errno != 0) {
DBG(3, "Got error %d on PTRACE_PEEKDATA", errno);
break;
}
n_scanned++;
n_scanned_from_last_frame++;
DBG(10, "SP %016lx", sp);
DBG(10, "Got addr %016lx", retaddr);
DBG(10, "Frame count %d", n_frames);
sp += sizeof(long);
if (next_likely_sp < sp) {
next_likely_sp = 0;
}
if (retaddr == 0) {
continue;
}
if (retaddr == top_sp) {
DBG(10,
"Addr matched top sp %016lx. "
"Dropping previously scanned blocks.",
retaddr);
matched_top_sp = true;
if (n_frames >= 2) {
vals_r.clear();
vals_r.push_back(top_addr);
n_scanned_from_last_frame = 0;
n_frames = 1;
sp_jumped = false;
}
}
if (pinfo.maps.empty()) {
continue;
}
int symbol_type = pinfo_symbol_exists(pinfo, retaddr);
DBG(10, "Got symbol type %d", symbol_type);
if (symbol_type) {
error_count = 0;
if (frame_check && symbol_type == 2 && n_scanned_from_last_frame >= 3 &&
((!matched_top_sp && n_scanned_from_last_frame >= 10) ||
n_frames >= 2 || top_addr_is_user_func) &&
!next_likely_sp) {
DBG(10, "Non target addr %016lx", retaddr);
} else {
if (next_likely_sp) {
DBG(10, "Jumping to next likely sp %016lx", next_likely_sp);
rollback_addr = sp - sizeof(long);
sp_jumped = true;
sp = next_likely_sp;
}
n_frames++;
n_scanned_from_last_frame = 0;
DBG(10, "Pushed addr %016lx", retaddr);
vals_r.push_back(retaddr);
next_likely_sp = 0;
if (n_frames == 2 && !second_addr) {
DBG(10, " This is second frame addr.");
second_addr = retaddr;
}
}
} else {
error_count++;
if (retaddr >= sp + sizeof(long) && retaddr < sp + max_frame_size) {
DBG(10, "retaddr is in sp range", "");
error_count = 0;
} else if (frame_check && error_count >= 2) {
next_likely_sp = 0;
if (rollback_addr && sp_jumped) {
DBG(10,
"Previous next likely sp was invalid."
"Scanning from %016lx",
rollback_addr);
sp = rollback_addr;
rollback_addr = 0;
// n_scanned= n_scanned - error_count;
error_count = 0;
sp_jumped = false;
if (!matched_top_sp || n_frames >= 2) {
vals_r.clear();
vals_r.push_back(top_addr);
n_scanned_from_last_frame = 0;
}
n_frames = 1;
continue;
}
}
}
if (is_stopper_addr(retaddr)) {
DBG(3, "Matched stopper func.", 0);
if (vals_r.size() == 2 && second_addr && second_addr != retaddr) {
DBG(10, "Putting second_addr.");
vals_r.pop_back();
vals_r.push_back(second_addr);
vals_r.push_back(retaddr);
}
break;
}
bool do_rollback = false;
if (retaddr >= sp + sizeof(long) && retaddr < sp + max_frame_size) {
if (next_likely_sp && n_frames <= 2) {
DBG(10,
"Finding Next Likely sp consecutive times. "
"Previously pushed addr was invalid");
do_rollback = true;
}
next_likely_sp = retaddr;
if (retaddr > sp + sizeof(long)) {
sp_jumped = true;
} else {
sp_jumped = false;
}
DBG(10, "Next Likely SP: %016lx", next_likely_sp);
}
if (sp_jumped && frame_check) {
if (n_scanned_from_last_frame >= 5 && n_frames >= 3) {
DBG(10,
"Scanned %d blocks from the last frame. This is invalid.",
n_scanned_from_last_frame);
do_rollback = true;
} else if (symbol_type == 1 && n_frames >= 3 &&
!is_stopper_addr(retaddr)) {
DBG(10,
"Matched core lib symbol type in the middle of stack frames. "
"This is invalid.");
do_rollback = true;
}
}
if (do_rollback) {
if (rollback_addr) {
DBG(10, "Scanning from %016lx", rollback_addr);
sp = rollback_addr;
rollback_addr = 0;
}
vals_r.clear();
vals_r.push_back(top_addr);
n_scanned_from_last_frame = 0;
n_frames = 1;
sp_jumped = false;
}
}
DBG(3, "Scanned %d blocks.", n_scanned);
return 0;
}
char* get_demangled_symbol(const char* symbol_name) {
uint arg = DMGL_ANSI;
if (print_arg) {
arg |= DMGL_PARAMS;
arg |= DMGL_TYPES;
}
char* demangled = cplus_demangle(symbol_name, arg);
if (!demangled) {
demangled = strdup(symbol_name);
}
return demangled;
}
void parse_stack_trace(const proc_info& pinfo,
const std::vector<ulong>& vals_sps,
size_t maxlen) {
char buf[128];
uint rank = 1;
std::string rstr;
for (size_t i = 0; i < std::min(vals_sps.size(), maxlen); ++i) {
std::stringstream out;
const char *file, *name;
uint lineno;
ulong addr = vals_sps[i];
ulong rel_addr = 0;
ulong offset = 0;
char* demangled;
bfd_handle* bh;
DBG(11, "addr: %016lx %ld %ld", addr, vals_sps.size(), maxlen);
bool ignore_basic_libs = true;
if (i == 0 || i == std::min(vals_sps.size(), maxlen) - 1) {
ignore_basic_libs = false;
}
const symbol_ent* e = pinfo_find_symbol(
pinfo, addr, offset, &bh, rel_addr, ignore_basic_libs);
if (e != 0) {
if (offset != 0) {
if (!single_line) {
snprintf(buf, sizeof(buf), "#%02d ", rank++);
out << buf;
snprintf(buf, sizeof(buf), "0x%016lx", addr);
out << buf;
out << " in ";
demangled = get_demangled_symbol(e->name.c_str());
out << demangled;
free(demangled);
if (!print_arg) {
out << " ()";
}
if (bh->has_debug()) {
int ret;
ret = bh->get_file_line(
rel_addr ? rel_addr : addr, &file, &name, &lineno);
if (ret && file) {
if (basename_only) {
file = basename(file);
}
out << " from ";
out << file;
out << ":";
out << lineno;
out << "";
}
} else {
if (basename_only) {
file = basename(bh->filename);
} else {
file = bh->filename;
}
out << " from ";
out << file;
}
print_stack("%s\n", out.str().c_str());
} else {
if (!rstr.empty()) {
rstr += ":";
}
demangled = get_demangled_symbol(e->name.c_str());
rstr += demangled;
free(demangled);
}
}
}
}
if (!rstr.empty()) {
print_stack("%s\n", rstr.c_str());
}
}
static int ptrace_attach_proc(int pid) {
if (ptrace(PTRACE_ATTACH, pid, 0, 0) != 0) {
if (errno == ESRCH) {
DBG(11, "No such process: %d", pid);
return ESRCH;
} else {
perror("ptrace(PTRACE_ATTACH)");
return -1;
}
}
int st = 0;
const pid_t v = waitpid(pid, &st, __WALL | WUNTRACED);
if (v < 0) {
perror("waitpid");
return -1;
}
return 0;
}
static int ptrace_detach_proc(int pid) {
if (ptrace(PTRACE_DETACH, pid, 0, 0) != 0) {
perror("ptrace(PTRACE_DETACH)");
return -1;
}
return 0;
}
int get_tgid(int target_pid) {
int tgid = -1;
const string status_file_path =
"/proc/" + std::to_string(target_pid) + "/status";
std::ifstream status_file(status_file_path);
if (!status_file.is_open()) {
return tgid;
}
string line;
while (std::getline(status_file, line)) {
if (startwith(line, "Tgid")) {
sscanf(line.c_str(), "Tgid:%d", &tgid);
}
}
return tgid;
}
void get_tids(const int target_pid, thread_list& threads) {
char fn[PATH_MAX];
bool target_pid_exists = false;
snprintf(fn, sizeof(fn), "/proc/%d/task", target_pid);
DIR* dp = opendir(fn);
int tgid = get_tgid(target_pid);
if (tgid <= 0) {
fprintf(stderr, "Failed to get parent's process id!\n");
exit(1);
}
if (dp) {
struct dirent* dent;
do {
dent = readdir(dp);
if (dent) {
if (dent->d_name[0] == '.') {
continue;
}
int tid = atoi(dent->d_name);
if (tid == target_pid) {
target_pid_exists = true;
continue;
} else if (tgid != target_pid) {
continue;
} else {
threads.push_back(thread_info(tid));
}
}
} while (dent);
closedir(dp);
} else {
fprintf(stderr, "Failed to access directory %s\n", fn);