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runtime/cgo: set the initial working directory

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Gives tests a way to find the bundle that contains their testdata, and
is generally useful for finding resources.

Change-Id: Idfa03e8543af927c17bc8ec8aadc5014ec82df28
Reviewed-on: https://go-review.googlesource.com/6000
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
This commit is contained in:
David Crawshaw 2015-02-25 16:11:53 -05:00
parent c1216c3a33
commit b54d313205
2 changed files with 48 additions and 2 deletions
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1
src/runtime/cgo/cgo.go
View File

@ -12,6 +12,7 @@ package cgo
/*
#cgo darwin,!arm LDFLAGS: -lpthread
#cgo darwin,arm LDFLAGS: -framework CoreFoundation
#cgo dragonfly LDFLAGS: -lpthread
#cgo freebsd LDFLAGS: -lpthread
#cgo android LDFLAGS: -llog

49
src/runtime/cgo/gcc_darwin_arm.c
View File

@ -2,10 +2,16 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include <string.h> /* for strerror */
#include <limits.h>
#include <pthread.h>
#include <signal.h>
#include <limits.h>
#include <string.h> /* for strerror */
#include <sys/param.h>
#include <unistd.h>
#include <CoreFoundation/CFBundle.h>
#include <CoreFoundation/CFString.h>
#include "libcgo.h"
#define magic (0xe696c4f4U)
@ -82,6 +88,43 @@ threadentry(void *v)
return nil;
}
// init_working_dir sets the current working directory to the app root.
// By default darwin/arm 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) {
fprintf(stderr, "runtime/cgo: no Info.plist URL\n");
return;
}
CFStringRef url_str_ref = CFURLGetString(url_ref);
char url[MAXPATHLEN];
if (!CFStringGetCString(url_str_ref, url, sizeof(url), kCFStringEncodingUTF8)) {
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(url);
if (url_len < sizeof("file://")+sizeof("/Info.plist")) {
fprintf(stderr, "runtime/cgo: bad URL: %s\n", url);
return;
}
url[url_len-sizeof("/Info.plist")+1] = 0;
char *dir = &url[0] + sizeof("file://")-1;
if (chdir(dir) != 0) {
fprintf(stderr, "runtime/cgo: chdir(%s) failed\n", dir);
}
}
void
x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
{
@ -96,4 +139,6 @@ x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
// yes, tlsbase from mrc might not be correctly aligned.
inittls(tlsg, (void**)((uintptr)tlsbase & ~3));
init_working_dir();
}