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67 lines
1.2 KiB
67 lines
1.2 KiB
/*
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* 测试成功时输出：
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* "clone success."
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* 测试失败时输出：
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* "clone error."
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*/
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#define __LIBRARY__
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <signal.h>
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#include "new.h"
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int clone(int (*fn)(void *), void *child_stack, ...)
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{
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register int res;
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va_list arg;
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va_start(arg,child_stack);
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__asm__("int $0x80"
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:"=a" (res)
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:"0" (__NR_clone),"b" (fn),"c" (child_stack),
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"d" (va_arg(arg,int)));
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if (res>=0)
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return res;
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errno = -res;
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return -1;
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}
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int g_shared = 0;
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size_t stack[1024] = {0};
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int child_pid;
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static int child_func(void * arg){
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g_shared = 1;
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printf(" Child says hello.\n");
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exit(0);
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}
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void test_clone(void){
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int wstatus, ret;
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child_pid = clone(child_func, stack+1024, SIGCHLD|CLONE_VM);
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assert(child_pid != -1);
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if (child_pid == 0){
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exit(0);
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}
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printf("child pid: %d\n", child_pid);
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ret = wait(&wstatus);
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if(ret == child_pid) {
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if (g_shared == 1) {
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printf("clone success.\n");
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}
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}
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else {
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printf("clone error.\n");
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}
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}
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int main(void){
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test_clone();
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return 0;
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}
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