如何使用cgo用argv包装C“hello world”？

概述请考虑以下hello.c： #include <stdio.h>int main(int argc, char* argv[]) { printf("Hello, world! argv[0]=%s\n", argv[0]);} Makefile只包含一行：all：hello.如何在Go程序中包装(和编译)这个函数,就像在这个(非工作)示例中一样？ package main// in 请考虑以下hello.c：

#include <stdio.h>int main(int argc,char* argv[]) {    printf("Hello,world! argv[0]=%s\n",argv[0]);}

Makefile只包含一行：all：hello.如何在Go程序中包装(和编译)这个函数,就像在这个(非工作)示例中一样？

package main// int main(int argc,char* argv[]);import "C"func main() {argc := C.int(1);argv := make([]*C.char,1)argv[0] = C.CString("hai");C.main(argc,&argv[0])}

我得到的错误是：

(virtualenv)[14:16:21][/tmp/cgo]$./main Fatal error: unexpected signal during runtime execution[signal 0xb code=0x1 addr=0x1c000000000 pc=0x41d563]runtime stack:runtime.throw(0x48b400,0x2a) /usr/lib/golang/src/runtime/panic.go:527 +0x90runtime.sigpanic() /usr/lib/golang/src/runtime/sigpanic_unix.go:12 +0x5aruntime.mHeap_Grow(0x6c7c20,0x8,0x0) /usr/lib/golang/src/runtime/mheap.go:647 +0x243runtime.mHeap_AllocSpanLocked(0x6c7c20,0x1,0x0) /usr/lib/golang/src/runtime/mheap.go:532 +0x5f1runtime.mHeap_Alloc_m(0x6c7c20,0x15,0x0) /usr/lib/golang/src/runtime/mheap.go:425 +0x1acruntime.mHeap_Alloc.func1() /usr/lib/golang/src/runtime/mheap.go:484 +0x41runtime.systemstack(0x7ffcb3aab958) /usr/lib/golang/src/runtime/asm_amd64.s:278 +0xabruntime.mHeap_Alloc(0x6c7c20,0x10000000015,0x40a954) /usr/lib/golang/src/runtime/mheap.go:485 +0x63runtime.mCentral_Grow(0x6d0898,0x0) /usr/lib/golang/src/runtime/mcentral.go:190 +0x93runtime.mCentral_CacheSpan(0x6d0898,0x6c1180) /usr/lib/golang/src/runtime/mcentral.go:86 +0x4d4runtime.mCache_Refill(0x7fbc9971d050,0x40ca28) /usr/lib/golang/src/runtime/mcache.go:118 +0xcfruntime.mallocgc.func2() /usr/lib/golang/src/runtime/malloc.go:611 +0x2bruntime.systemstack(0x7ffcb3aabb28) /usr/lib/golang/src/runtime/asm_amd64.s:278 +0xabruntime.mallocgc(0x180,0x476220,0x0,0x800000000) /usr/lib/golang/src/runtime/malloc.go:612 +0x842runtime.newobject(0x476220,0x6c0c40) /usr/lib/golang/src/runtime/malloc.go:760 +0x42runtime.malg(0x8000,0x6c0e40) /usr/lib/golang/src/runtime/proc1.go:2188 +0x27runtime.mpreinit(0x6c1180) /usr/lib/golang/src/runtime/os1_linux.go:197 +0x1fruntime.mcommoninit(0x6c1180) /usr/lib/golang/src/runtime/proc1.go:114 +0x100runtime.schedinit() /usr/lib/golang/src/runtime/proc1.go:57 +0x79runtime.rt0_go(0xc82002e008,0xc82002e008,0x40122a,0xc82004fef8,0x44fbaa,0xc82004fe80,...) /usr/lib/golang/src/runtime/asm_amd64.s:109 +0x132goroutine 1 [syscall,locked to thread]:runtime.cgocall(0x401210,0x0) /usr/lib/golang/src/runtime/cgocall.go:120 +0x11b fp=0xc82004feb0 sp=0xc82004fe80main._Cfunc_main(0x1,0x0) command-line-arguments/_obj/_cgo_gotypes.go:49 +0x39 fp=0xc82004fef8 sp=0xc82004feb0main.main() /tmp/cgo/main.go:8 +0xb4 fp=0xc82004ff50 sp=0xc82004fef8runtime.main() /usr/lib/golang/src/runtime/proc.go:111 +0x2b0 fp=0xc82004ffa0 sp=0xc82004ff50runtime.goexit() /usr/lib/golang/src/runtime/asm_amd64.s:1696 +0x1 fp=0xc82004ffa8 sp=0xc82004ffa0goroutine 17 [syscall,locked to thread]:runtime.goexit() /usr/lib/golang/src/runtime/asm_amd64.s:1696 +0x1

解决方法 当使用go run main.go时,我得到相同的结果,但是当使用go build.时,你得到一个更好的错误：

/tmp/go-build887090083/cgoSO/_obj/hello.o: In function `main':/usr/include/x86_64-linux-gnu/bits/stdio2.h:104: multiple deFinition of `main'/tmp/go-build887090083/cgoSO/_obj/_cgo_main.o:/tmp/go-build887090083/cgoSO/_obj/_cgo_main.c:1: first defined herecollect2: error: ld returned 1 exit status

然后我添加了-work标志来构建以持久保存tmp工作区,这里是/tmp/go-build465152107/cgoSO/_obj/_cgo_main.c的内容：

int main() { return 0; }voID crosscall2(voID(*fn)(voID*,int),voID *a,int c) { }voID _cgo_wait_runtime_init_done() { }char* _cgo_topofstack(voID) { return (char*)0; }voID _cgo_allocate(voID *a,int c) { }voID _cgo_panic(voID *a,int c) { }voID _cgo_reginit(voID) { }

第一行写在那里：https://github.com/golang/go/blob/f2e4c8b5fb3660d793b2c545ef207153db0a34b1/src/cmd/cgo/out.go#L49

没有条件,所以无法避免.

结论：你不能导入C程序,你只能导入库(它实际上是有意义的).

如果C是您的代码,那么只需将main更改为其他任何内容即可.

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