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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include <limits.h>
#include <pthread.h>
#include <signal.h>
#include <string.h> /* for strerror */
#include <sys/param.h>
#include <unistd.h>
#include <stdlib.h>
#include "libcgo.h"
#include "libcgo_unix.h"
#include <TargetConditionals.h>
#if TARGET_OS_IPHONE
#include <CoreFoundation/CFBundle.h>
#include <CoreFoundation/CFString.h>
#endif
static void *threadentry(void*);
static void (*setg_gcc)(void*);
void
_cgo_sys_thread_start(ThreadStart *ts)
{
pthread_attr_t attr;
sigset_t ign, oset;
pthread_t p;
size_t size;
int err;
//fprintf(stderr, "runtime/cgo: _cgo_sys_thread_start: fn=%p, g=%p\n", ts->fn, ts->g); // debug
sigfillset(&ign);
pthread_sigmask(SIG_SETMASK, &ign, &oset);
size = pthread_get_stacksize_np(pthread_self());
pthread_attr_init(&attr);
pthread_attr_setstacksize(&attr, size);
// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
ts->g->stackhi = size;
err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
pthread_sigmask(SIG_SETMASK, &oset, nil);
if (err != 0) {
fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
abort();
}
}
extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
static void*
threadentry(void *v)
{
ThreadStart ts;
ts = *(ThreadStart*)v;
free(v);
#if TARGET_OS_IPHONE
darwin_arm_init_thread_exception_port();
#endif
crosscall1(ts.fn, setg_gcc, (void*)ts.g);
return nil;
}
#if TARGET_OS_IPHONE
// init_working_dir sets the current working directory to the app root.
// By default ios/arm64 processes start in "/".
static void
init_working_dir()
{
CFBundleRef bundle = CFBundleGetMainBundle();
if (bundle == NULL) {
fprintf(stderr, "runtime/cgo: no main bundle\n");
return;
}
CFURLRef url_ref = CFBundleCopyResourceURL(bundle, CFSTR("Info"), CFSTR("plist"), NULL);
if (url_ref == NULL) {
// No Info.plist found. It can happen on Corellium virtual devices.
return;
}
CFStringRef url_str_ref = CFURLGetString(url_ref);
char buf[MAXPATHLEN];
Boolean res = CFStringGetCString(url_str_ref, buf, sizeof(buf), kCFStringEncodingUTF8);
CFRelease(url_ref);
if (!res) {
fprintf(stderr, "runtime/cgo: cannot get URL string\n");
return;
}
// url is of the form "file:///path/to/Info.plist".
// strip it down to the working directory "/path/to".
int url_len = strlen(buf);
if (url_len < sizeof("file://")+sizeof("/Info.plist")) {
fprintf(stderr, "runtime/cgo: bad URL: %s\n", buf);
return;
}
buf[url_len-sizeof("/Info.plist")+1] = 0;
char *dir = &buf[0] + sizeof("file://")-1;
if (chdir(dir) != 0) {
fprintf(stderr, "runtime/cgo: chdir(%s) failed\n", dir);
}
// The test harness in go_ios_exec passes the relative working directory
// in the GoExecWrapperWorkingDirectory property of the app bundle.
CFStringRef wd_ref = CFBundleGetValueForInfoDictionaryKey(bundle, CFSTR("GoExecWrapperWorkingDirectory"));
if (wd_ref != NULL) {
if (!CFStringGetCString(wd_ref, buf, sizeof(buf), kCFStringEncodingUTF8)) {
fprintf(stderr, "runtime/cgo: cannot get GoExecWrapperWorkingDirectory string\n");
return;
}
if (chdir(buf) != 0) {
fprintf(stderr, "runtime/cgo: chdir(%s) failed\n", buf);
}
}
}
#endif // TARGET_OS_IPHONE
void
x_cgo_init(G *g, void (*setg)(void*))
{
size_t size;
//fprintf(stderr, "x_cgo_init = %p\n", &x_cgo_init); // aid debugging in presence of ASLR
setg_gcc = setg;
size = pthread_get_stacksize_np(pthread_self());
g->stacklo = (uintptr)&size - size + 4096;
#if TARGET_OS_IPHONE
darwin_arm_init_mach_exception_handler();
darwin_arm_init_thread_exception_port();
init_working_dir();
#endif
}
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