gcc_ios_arm64.c

     1  // Copyright 2014 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  #include <limits.h>
     6  #include <string.h> /* for strerror */
     7  #include <sys/param.h>
     8  #include <unistd.h>
     9  #include <stdlib.h>
    10  
    11  #include "libcgo.h"
    12  
    13  #include <TargetConditionals.h>
    14  
    15  #if TARGET_OS_IPHONE
    16  #include <CoreFoundation/CFBundle.h>
    17  #include <CoreFoundation/CFString.h>
    18  #endif
    19  
    20  #if TARGET_OS_IPHONE
    21  
    22  static void
    23  threadentry_platform(void)
    24  {
    25  #if TARGET_OS_IPHONE
    26  	darwin_arm_init_thread_exception_port();
    27  #endif
    28  }
    29  
    30  // init_working_dir sets the current working directory to the app root.
    31  // By default ios/arm64 processes start in "/".
    32  static void
    33  init_working_dir()
    34  {
    35  	CFBundleRef bundle;
    36  	CFURLRef url_ref;
    37  	CFStringRef url_str_ref;
    38  	char buf[MAXPATHLEN];
    39  	Boolean res;
    40  	int url_len;
    41  	char *dir;
    42  	CFStringRef wd_ref;
    43  
    44  	bundle = CFBundleGetMainBundle();
    45  	if (bundle == NULL) {
    46  		fprintf(stderr, "runtime/cgo: no main bundle\n");
    47  		return;
    48  	}
    49  	url_ref = CFBundleCopyResourceURL(bundle, CFSTR("Info"), CFSTR("plist"), NULL);
    50  	if (url_ref == NULL) {
    51  		// No Info.plist found. It can happen on Corellium virtual devices.
    52  		return;
    53  	}
    54  	url_str_ref = CFURLGetString(url_ref);
    55  	res = CFStringGetCString(url_str_ref, buf, sizeof(buf), kCFStringEncodingUTF8);
    56  	CFRelease(url_ref);
    57  	if (!res) {
    58  		fprintf(stderr, "runtime/cgo: cannot get URL string\n");
    59  		return;
    60  	}
    61  
    62  	// url is of the form "file:///path/to/Info.plist".
    63  	// strip it down to the working directory "/path/to".
    64  	url_len = strlen(buf);
    65  	if (url_len < sizeof("file://")+sizeof("/Info.plist")) {
    66  		fprintf(stderr, "runtime/cgo: bad URL: %s\n", buf);
    67  		return;
    68  	}
    69  	buf[url_len-sizeof("/Info.plist")+1] = 0;
    70  	dir = &buf[0] + sizeof("file://")-1;
    71  
    72  	if (chdir(dir) != 0) {
    73  		fprintf(stderr, "runtime/cgo: chdir(%s) failed\n", dir);
    74  	}
    75  
    76  	// The test harness in go_ios_exec passes the relative working directory
    77  	// in the GoExecWrapperWorkingDirectory property of the app bundle.
    78  	wd_ref = CFBundleGetValueForInfoDictionaryKey(bundle, CFSTR("GoExecWrapperWorkingDirectory"));
    79  	if (wd_ref != NULL) {
    80  		if (!CFStringGetCString(wd_ref, buf, sizeof(buf), kCFStringEncodingUTF8)) {
    81  			fprintf(stderr, "runtime/cgo: cannot get GoExecWrapperWorkingDirectory string\n");
    82  			return;
    83  		}
    84  		if (chdir(buf) != 0) {
    85  			fprintf(stderr, "runtime/cgo: chdir(%s) failed\n", buf);
    86  		}
    87  	}
    88  }
    89  
    90  #endif // TARGET_OS_IPHONE
    91  
    92  static void
    93  init_platform()
    94  {
    95  #if TARGET_OS_IPHONE
    96  	darwin_arm_init_mach_exception_handler();
    97  	darwin_arm_init_thread_exception_port();
    98  	init_working_dir();
    99  #endif
   100  }
   101  
   102  void (*x_cgo_init_platform)(void) = init_platform;
   103  void (*x_cgo_threadentry_platform)(void) = threadentry_platform;
   104
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