/
rbtrace.c
1179 lines (956 loc) · 24.8 KB
/
rbtrace.c
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#include <assert.h>
#include <inttypes.h>
#include <errno.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <msgpack.h>
#include <ruby.h>
#ifndef RUBY_VM
#include <env.h>
#include <node.h>
#include <st.h>
#define rb_sourcefile() (ruby_current_node ? ruby_current_node->nd_file : 0)
#define rb_sourceline() (ruby_current_node ? nd_line(ruby_current_node) : 0)
#else
#include <ruby/st.h>
#endif
#ifndef RSTRING_PTR
#define RSTRING_PTR(str) RSTRING(str)->ptr
#endif
#ifndef RSTRING_LEN
#define RSTRING_LEN(str) RSTRING(str)->len
#endif
#ifndef RBASIC_CLASS
#define RBASIC_CLASS(obj) (RBASIC(obj)->klass)
#endif
#ifdef __FreeBSD__
#define PLATFORM_FREEBSD
#elif __OpenBSD__
#define PLATFORM_OPENBSD
#endif
static uint64_t
ru_utime_usec()
{
struct rusage r_usage;
getrusage(RUSAGE_SELF, &r_usage);
return (uint64_t)r_usage.ru_utime.tv_sec*1e6 +
(uint64_t)r_usage.ru_utime.tv_usec;
}
static uint64_t
timeofday_usec()
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (uint64_t)tv.tv_sec*1e6 +
(uint64_t)tv.tv_usec;
}
#define MAX_CALLS 32768 // up to this many stack frames examined in slow watch mode
#define MAX_TRACERS 100 // max method tracers
#define MAX_EXPRS 10 // max expressions per tracer
#ifndef BUF_SIZE // msgq buffer size
#define BUF_SIZE 120
#endif
typedef struct {
int id;
char *query;
bool is_slow;
char *klass_name;
size_t klass_len;
bool is_singleton;
VALUE self;
VALUE klass;
ID mid;
int num_exprs;
char *exprs[MAX_EXPRS];
} rbtracer_t;
typedef struct {
long mtype;
char buf[BUF_SIZE];
} event_msg_t;
static struct {
st_table *mid_tbl;
st_table *klass_tbl;
pid_t attached_pid;
bool installed;
bool devmode;
bool gc;
bool firehose;
bool slow;
bool slowcpu;
uint64_t call_times[MAX_CALLS];
uint64_t call_utimes[MAX_CALLS];
int num_calls;
uint32_t threshold;
unsigned int num;
unsigned int num_slow;
rbtracer_t list[MAX_TRACERS];
key_t mqi_key;
int mqi_id;
int mqo_fd;
struct sockaddr_un mqo_addr;
socklen_t mqo_len;
msgpack_sbuffer *sbuf;
msgpack_packer *msgpacker;
}
rbtracer = {
.mid_tbl = NULL,
.klass_tbl = NULL,
.attached_pid = 0,
.installed = false,
.devmode = false,
.gc = false,
.firehose = false,
.slow = false,
.slowcpu = false,
.num_calls = 0,
.threshold = 250,
.num = 0,
.num_slow = 0,
.list = {},
.mqi_key = 0,
.mqi_id = -1,
.mqo_fd = -1,
.mqo_addr = {.sun_family = AF_UNIX},
.sbuf = NULL,
.msgpacker = NULL
};
static void
msgq_teardown(),
rbtracer_detach();
static inline void
rbtrace__send_event(int nargs, const char *name, ...)
{
if (!rbtracer.attached_pid ||
!rbtracer.sbuf ||
!rbtracer.msgpacker ||
rbtracer.mqo_fd == -1)
return;
int n;
msgpack_sbuffer_clear(rbtracer.sbuf);
msgpack_packer *pk = rbtracer.msgpacker;
msgpack_pack_array(pk, nargs+1);
msgpack_pack_bin(pk, strlen(name));
msgpack_pack_bin_body(pk, name, strlen(name));
if (nargs > 0) {
int type;
int sint;
uint32_t uint;
uint64_t uint64;
unsigned long ulong;
char *str;
va_list ap;
va_start(ap, name);
for (n=0; n<nargs; n++) {
type = va_arg(ap, int);
switch (type) {
case 'b': // boolean
if (va_arg(ap, int))
msgpack_pack_true(pk);
else
msgpack_pack_false(pk);
break;
case 'd': // signed int
sint = va_arg(ap, int);
msgpack_pack_int(pk, sint);
break;
case 'u': // unsigned int
uint = va_arg(ap, uint32_t);
msgpack_pack_uint32(pk, uint);
break;
case 'l': // unsigned long (VALUE/ID)
ulong = va_arg(ap, unsigned long);
msgpack_pack_unsigned_long(pk, ulong);
break;
case 't': // uint64 (timestamps)
uint64 = va_arg(ap, uint64_t);
msgpack_pack_uint64(pk, uint64);
break;
case 'n': // current timestamp
msgpack_pack_uint64(pk, timeofday_usec());
break;
case 's': // string
str = va_arg(ap, char *);
if (!str)
str = (char *)"";
msgpack_pack_bin(pk, strlen(str));
msgpack_pack_bin_body(pk, str, strlen(str));
break;
default:
fprintf(stderr, "unknown type (%d) passed to rbtrace__send_event for %s\n", (int)type, name);
}
}
va_end(ap);
}
int ret = -1;
for (n=0; n<10 && ret==-1; n++)
ret = sendto(
rbtracer.mqo_fd,
rbtracer.sbuf->data, rbtracer.sbuf->size,
#ifdef MSG_NOSIGNAL
MSG_NOSIGNAL,
#else
0,
#endif
(const struct sockaddr *)&rbtracer.mqo_addr, rbtracer.mqo_len
);
if (ret == -1 && (errno == EINVAL || errno == ENOENT || errno == ECONNREFUSED || errno == EPIPE)) {
fprintf(stderr, "sendto(%d): %s [detaching]\n", rbtracer.mqo_fd, strerror(errno));
msgq_teardown();
rbtracer_detach();
} else if (ret == -1) {
fprintf(stderr, "sendto(%d): %s\n", rbtracer.mqo_fd, strerror(errno));
}
}
static inline void
rbtrace__send_names(ID mid, VALUE klass)
{
if (!rbtracer.mid_tbl)
rbtracer.mid_tbl = st_init_numtable();
if (!st_is_member(rbtracer.mid_tbl, mid)) {
st_insert(rbtracer.mid_tbl, (st_data_t)mid, (st_data_t)1);
rbtrace__send_event(2,
"mid",
'l', mid,
's', rb_id2name(mid)
);
}
if (!rbtracer.klass_tbl)
rbtracer.klass_tbl = st_init_numtable();
if (rbtracer.devmode || !st_is_member(rbtracer.klass_tbl, klass)) {
if (!rbtracer.devmode)
st_insert(rbtracer.klass_tbl, (st_data_t)klass, (st_data_t)1);
rbtrace__send_event(2,
"klass",
'l', klass,
's', rb_class2name(klass)
);
}
}
static int in_event_hook = 0;
static void
#ifdef RUBY_VM
event_hook(rb_event_flag_t event, VALUE data, VALUE self, ID mid, VALUE klass)
#else
event_hook(rb_event_t event, NODE *node, VALUE self, ID mid, VALUE klass)
#endif
{
// do not re-enter this function
// after this, must `goto out` instead of `return`
if (in_event_hook) return;
in_event_hook++;
#ifdef ID_ALLOCATOR
// skip allocators
if (mid == ID_ALLOCATOR) goto out;
#endif
#ifdef RUBY_VM
if (mid == 0) {
ID _mid;
VALUE _klass;
rb_frame_method_id_and_class(&_mid, &_klass);
mid = _mid;
klass = _klass;
}
#endif
// normalize klass and check for class-level methods
bool singleton = false;
if (klass) {
if (TYPE(klass) == T_ICLASS) {
klass = RBASIC_CLASS(klass);
}
singleton = FL_TEST(klass, FL_SINGLETON);
#ifdef RUBY_VM
if (singleton &&
!(TYPE(self) == T_CLASS ||
TYPE(self) == T_MODULE))
singleton = false;
#endif
}
rbtracer_t *tracer = NULL;
if (rbtracer.firehose) {
// trace everything
} else if (rbtracer.num > 0) {
// tracing only specific methods
int i, n;
for (i=0, n=0; i<MAX_TRACERS && n<rbtracer.num; i++) {
rbtracer_t *curr = &rbtracer.list[i];
if (curr->query) {
n++;
// there should never be slow method tracers outside slow mode
if (!rbtracer.slow && curr->is_slow) continue;
if (rbtracer.devmode) {
if ((!curr->mid || curr->mid == mid) &&
(!curr->klass_name || (
(singleton == curr->is_singleton) &&
(0 == strncmp(rb_class2name(singleton ? self : klass), curr->klass_name, curr->klass_len)))))
{
tracer = curr;
break;
}
} else {
if ((!curr->mid || curr->mid == mid) &&
(!curr->klass || curr->klass == klass) &&
(!curr->self || curr->self == self))
{
tracer = curr;
break;
}
}
}
}
if (tracer) {
// matched something, all good!
} else if (rbtracer.slow && rbtracer.num_slow == 0) {
// in global slow mode, so go ahead.
} else {
goto out;
}
} else if (rbtracer.slow && rbtracer.num_slow == 0) {
// trace everything that's slow
} else {
// what are we doing here?
goto out;
}
// are we watching for slow method calls?
if (rbtracer.slow && (!tracer || tracer->is_slow)) {
uint64_t usec = timeofday_usec(),
ut_usec = ru_utime_usec(),
diff = 0;
switch (event) {
case RUBY_EVENT_C_CALL:
case RUBY_EVENT_CALL:
if (rbtracer.num_calls < MAX_CALLS) {
rbtracer.call_times[ rbtracer.num_calls ] = usec;
if (rbtracer.slowcpu)
rbtracer.call_utimes[ rbtracer.num_calls ] = ut_usec;
}
rbtracer.num_calls++;
break;
case RUBY_EVENT_C_RETURN:
case RUBY_EVENT_RETURN:
if (rbtracer.num_calls > 0) {
rbtracer.num_calls--;
if (rbtracer.num_calls < MAX_CALLS) {
if (rbtracer.slowcpu)
diff = ut_usec - rbtracer.call_utimes[ rbtracer.num_calls ];
else
diff = usec - rbtracer.call_times[ rbtracer.num_calls ];
}
}
break;
}
if (diff > rbtracer.threshold * 1e3) {
rbtrace__send_names(mid, singleton ? self : klass);
rbtrace__send_event(6,
event == RUBY_EVENT_RETURN ? "slow" : "cslow",
't', rbtracer.call_times[ rbtracer.num_calls ],
't', diff,
'u', rbtracer.num_calls,
'l', mid,
'b', singleton,
'l', singleton ? self : klass
);
}
goto out;
}
switch (event) {
case RUBY_EVENT_CALL:
case RUBY_EVENT_C_CALL:
rbtrace__send_names(mid, singleton ? self : klass);
rbtrace__send_event(5,
event == RUBY_EVENT_CALL ? "call" : "ccall",
'n',
'd', tracer ? tracer->id : 255, // hax
'l', mid,
'b', singleton,
'l', singleton ? self : klass
);
if (tracer && tracer->num_exprs) {
int i;
for (i=0; i<tracer->num_exprs; i++) {
char *expr = tracer->exprs[i];
size_t len = strlen(expr);
VALUE val = Qnil;
char buffer[len+150];
char *result = NULL;
if (len == 4 && strcmp("self", expr) == 0) {
val = rb_inspect(self);
} else if (len == 10 && strcmp("__source__", expr) == 0) {
snprintf(buffer, len+150, "\"%s:%d\"", rb_sourcefile(), rb_sourceline());
result = buffer;
} else if (len > 2 && expr[0] == '@' && expr[1] != '@') {
val = rb_inspect(rb_ivar_get(self, rb_intern(expr)));
} else {
snprintf(buffer, len+150, "(begin; ObjectSpace._id2ref(%ld).instance_eval{ %s }; rescue Exception => e; e; end).inspect", NUM2LONG(rb_obj_id(self)), expr);
val = rb_eval_string_protect(buffer, 0);
}
if (RTEST(val) && TYPE(val) == T_STRING) {
result = RSTRING_PTR(val);
}
if (result && *result) {
rbtrace__send_event(3,
"exprval",
'd', tracer->id,
'd', i,
's', result
);
}
}
}
break;
case RUBY_EVENT_RETURN:
case RUBY_EVENT_C_RETURN:
rbtrace__send_event(2,
event == RUBY_EVENT_RETURN ? "return" : "creturn",
'n',
'd', tracer ? tracer->id : 255 // hax
);
break;
}
out:
in_event_hook--;
}
static void
event_hook_install()
{
if (!rbtracer.installed) {
rb_add_event_hook(
event_hook,
RUBY_EVENT_CALL | RUBY_EVENT_C_CALL |
RUBY_EVENT_RETURN | RUBY_EVENT_C_RETURN
#ifdef RUBY_VM
, 0
#endif
);
rbtracer.installed = true;
}
}
static void
event_hook_remove()
{
if (rbtracer.installed) {
rb_remove_event_hook(event_hook);
rbtracer.installed = false;
}
}
#ifdef HAVE_RB_GC_ADD_EVENT_HOOK
// requires https://github.com/tmm1/brew2deb/blob/master/packages/ruby/patches/gc-hooks.patch
static void
rbtrace_gc_event_hook(rb_gc_event_t gc_event, VALUE obj)
{
switch(gc_event)
{
case RUBY_GC_EVENT_START:
rbtrace__send_event(1,
"gc_start",
'n'
);
break;
case RUBY_GC_EVENT_END:
rbtrace__send_event(1,
"gc_end",
'n'
);
break;
}
}
#endif
static int
rbtracer_remove(char *query, int id)
{
int i;
int tracer_id = -1;
rbtracer_t *tracer = NULL;
if (query) {
for (i=0; i<MAX_TRACERS; i++) {
if (rbtracer.list[i].query) {
if (0 == strcmp(query, rbtracer.list[i].query)) {
tracer = &rbtracer.list[i];
break;
}
}
}
} else {
if (id >= MAX_TRACERS) goto out;
tracer = &rbtracer.list[id];
}
if (tracer->query) {
tracer_id = tracer->id;
tracer->mid = 0;
free(tracer->query);
tracer->query = NULL;
if (tracer->num_exprs) {
for(i=0; i<tracer->num_exprs; i++) {
free(tracer->exprs[i]);
tracer->exprs[i] = NULL;
}
tracer->num_exprs = 0;
}
rbtracer.num--;
if (tracer->is_slow)
rbtracer.num_slow--;
if (rbtracer.num == 0)
event_hook_remove();
}
out:
rbtrace__send_event(2,
"remove",
'd', tracer_id,
's', query
);
return tracer_id;
}
static void
rbtracer_detach()
{
rbtracer.attached_pid = 0;
rbtracer.firehose = false;
rbtracer.slow = false;
rbtracer.slowcpu = false;
rbtracer.gc = false;
rbtracer.devmode = false;
rbtracer.num_calls = 0;
int i;
for (i=0; i<MAX_TRACERS; i++) {
if (rbtracer.list[i].query) {
rbtracer_remove(NULL, i);
}
}
if (rbtracer.mid_tbl)
st_free_table(rbtracer.mid_tbl);
rbtracer.mid_tbl = NULL;
if (rbtracer.klass_tbl)
st_free_table(rbtracer.klass_tbl);
rbtracer.klass_tbl = NULL;
event_hook_remove();
#ifdef HAVE_RB_GC_ADD_EVENT_HOOK
rb_gc_remove_event_hook(rbtrace_gc_event_hook);
#endif
}
static int
rbtracer_add(char *query, bool is_slow)
{
int i;
int tracer_id = -1;
rbtracer_t *tracer = NULL;
if (rbtracer.num >= MAX_TRACERS) goto out;
for (i=0; i<MAX_TRACERS; i++) {
if (!rbtracer.list[i].query) {
tracer = &rbtracer.list[i];
tracer_id = i;
break;
}
}
if (!tracer) goto out;
size_t
klass_begin = 0,
klass_end = 0;
bool is_singleton = false;
VALUE
klass = 0,
self = 0;
ID mid = 0;
{ // resolve query into its parts
char
*idx = NULL,
*method = NULL;
if (NULL != (idx = rindex(query, '.'))) {
klass_begin = 0;
klass_end = idx - query;
is_singleton = true;
*idx = 0;
if (!rbtracer.devmode)
self = rb_eval_string_protect(query, 0);
*idx = '.';
method = idx+1;
} else if (NULL != (idx = rindex(query, '#'))) {
klass_begin = 0;
klass_end = idx - query;
is_singleton = false;
*idx = 0;
if (!rbtracer.devmode)
klass = rb_eval_string_protect(query, 0);
*idx = '#';
method = idx+1;
} else {
method = query;
}
if (method && *method) {
mid = rb_intern(method);
}
}
if (rbtracer.devmode) {
if (!mid && (klass_begin == klass_end))
goto out;
} else {
if (!mid && !klass && !self)
goto out;
}
memset(tracer, 0, sizeof(*tracer));
tracer->id = tracer_id;
tracer->query = strdup(query);
tracer->is_slow = is_slow;
if (klass_end != klass_begin) {
tracer->klass_name = tracer->query + klass_begin;
tracer->klass_len = klass_end - klass_begin;
}
tracer->is_singleton = is_singleton;
tracer->self = self;
tracer->klass = klass;
tracer->mid = mid;
if (rbtracer.num == 0)
event_hook_install();
rbtracer.num++;
if (tracer->is_slow)
rbtracer.num_slow++;
out:
rbtrace__send_event(2,
"add",
'd', tracer_id,
's', query
);
return tracer_id;
}
static void
rbtracer_add_expr(int id, char *expr)
{
int expr_id = -1;
int tracer_id = -1;
rbtracer_t *tracer = NULL;
if (id >= MAX_TRACERS) goto out;
tracer = &rbtracer.list[id];
if (tracer->query) {
tracer_id = tracer->id;
if (tracer->num_exprs < MAX_EXPRS) {
expr_id = tracer->num_exprs++;
tracer->exprs[expr_id] = strdup(expr);
}
}
out:
rbtrace__send_event(3,
"newexpr",
'd', tracer_id,
'd', expr_id,
's', expr
);
}
static void
rbtracer_watch(uint32_t threshold, bool cpu_time)
{
if (!rbtracer.slow) {
rbtracer.num_calls = 0;
rbtracer.threshold = threshold;
rbtracer.firehose = false;
rbtracer.slow = true;
rbtracer.slowcpu = cpu_time;
event_hook_install();
}
}
static void
msgq_teardown()
{
pid_t pid = getpid();
if (rbtracer.mqo_fd != -1) {
close(rbtracer.mqo_fd);
rbtracer.mqo_fd = -1;
}
if (rbtracer.mqi_id != -1 && rbtracer.mqi_key == (key_t)-pid) {
msgctl(rbtracer.mqi_id, IPC_RMID, NULL);
rbtracer.mqi_id = -1;
rbtracer.mqi_key = 0;
}
}
static void
ruby_teardown(VALUE data)
{
msgq_teardown();
}
static inline void
msgq_setup()
{
pid_t pid = getpid();
int val;
if (rbtracer.mqi_key != (key_t)-pid ||
rbtracer.mqo_fd == -1) {
msgq_teardown();
} else {
return;
}
rbtracer.mqi_key = (key_t) -pid;
rbtracer.mqi_id = msgget(rbtracer.mqi_key, 0666 | IPC_CREAT);
if (rbtracer.mqi_id == -1)
fprintf(stderr, "msgget() failed to create msgq\n");
rbtracer.mqo_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if (rbtracer.mqo_fd == -1)
fprintf(stderr, "socket() failed to create dgram\n");
snprintf(rbtracer.mqo_addr.sun_path, sizeof(rbtracer.mqo_addr.sun_path), "/tmp/rbtrace-%d.sock", pid);
rbtracer.mqo_len = SUN_LEN(&rbtracer.mqo_addr);
val = 65536;
setsockopt(rbtracer.mqo_fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof(int));
#ifdef SO_NOSIGPIPE
val = 1;
setsockopt(rbtracer.mqo_fd, SOL_SOCKET, SO_NOSIGPIPE, &val, sizeof(int));
#endif
}
static VALUE rbtrace_module;
static VALUE
eval_inspect(VALUE rb_code) {
return rb_funcall(rbtrace_module, rb_intern("eval_and_inspect"), 1, rb_code);
}
static VALUE
rescue_inspect(VALUE arg) {
VALUE exception = rb_errinfo(); /* get last exception */
rb_set_errinfo(Qnil);
return rb_funcall(exception, rb_intern("inspect"), 0);
}
static void
rbtrace__process_event(msgpack_object cmd)
{
if (cmd.type != MSGPACK_OBJECT_ARRAY)
return;
static int last_tracer_id = -1; // hax
char query[BUF_SIZE];
char code[BUF_SIZE+150];
VALUE val = Qnil;
msgpack_object_array ary;
msgpack_object_str str;
/* fprintf(stderr, "GOT: ");*/
/* msgpack_object_print(stderr, cmd);*/
/* fprintf(stderr, "\n");*/
ary = cmd.via.array;
if (ary.size < 1 ||
ary.ptr[0].type != MSGPACK_OBJECT_STR)
return;
str = ary.ptr[0].via.str;
if (0 == strncmp("attach", str.ptr, str.size)) {
if (ary.size != 2 ||
ary.ptr[1].type != MSGPACK_OBJECT_POSITIVE_INTEGER)
return;
pid_t pid = (pid_t) ary.ptr[1].via.u64;
if (pid && rbtracer.attached_pid == 0)
rbtracer.attached_pid = pid;
rbtrace__send_event(1,
"attached",
'u', (uint32_t) rbtracer.attached_pid
);
} else if (0 == strncmp("detach", str.ptr, str.size)) {
if (rbtracer.attached_pid) {
rbtrace__send_event(1,
"detached",
'u', (uint32_t) rbtracer.attached_pid
);
}
rbtracer_detach();
} else if (0 == strncmp("watch", str.ptr, 5)) {
if (ary.size != 2 ||
ary.ptr[1].type != MSGPACK_OBJECT_POSITIVE_INTEGER)
return;
unsigned int msec = ary.ptr[1].via.u64;
rbtracer_watch(msec, str.size > 5 /* watchcpu */);
} else if (0 == strncmp("firehose", str.ptr, str.size)) {
rbtracer.firehose = true;
event_hook_install();
} else if (0 == strncmp("add", str.ptr, str.size)) {
if (ary.size != 3 ||
ary.ptr[1].type != MSGPACK_OBJECT_STR ||
ary.ptr[2].type != MSGPACK_OBJECT_BOOLEAN)
return;
str = ary.ptr[1].via.str;
bool is_slow = ary.ptr[2].via.boolean;
strncpy(query, str.ptr, str.size);
query[str.size] = 0;
last_tracer_id = rbtracer_add(query, is_slow);
} else if (0 == strncmp("addexpr", str.ptr, str.size)) {
if (ary.size != 2 ||
ary.ptr[1].type != MSGPACK_OBJECT_STR)
return;
str = ary.ptr[1].via.str;
strncpy(query, str.ptr, str.size);
query[str.size] = 0;
rbtracer_add_expr(last_tracer_id, query);
} else if (0 == strncmp("gc", str.ptr, str.size)) {
rbtracer.gc = true;
#ifdef HAVE_RB_GC_ADD_EVENT_HOOK
rb_gc_add_event_hook(rbtrace_gc_event_hook, RUBY_GC_EVENT_START|RUBY_GC_EVENT_END);
#endif
} else if (0 == strncmp("devmode", str.ptr, str.size)) {
rbtracer.devmode = true;
} else if (0 == strncmp("fork", str.ptr, str.size)) {
pid_t outer = fork();
if (outer == 0) {
rb_eval_string_protect("$0 = \"[DEBUG] #{Process.ppid}\"", 0);
#if defined(PLATFORM_FREEBSD) || defined(PLATFORM_OPENBSD)
// The call setpgrp() is equivalent to setpgid(0,0).
setpgid(0,0);
#else
setpgrp();
#endif
pid_t inner = fork();
if (inner == 0) {
// a ruby process will never have more than 20k
// open file descriptors, right?
int fd;
for (fd=3; fd<20000; fd++)
close(fd);
// busy loop
while (1) sleep(1);