【发布时间】:2013-12-22 21:48:27
【问题描述】:
我想在 OS X 上使用clone 系统调用。这是一个 Unix 系统调用,所以应该没有问题,对吧?我已成功尝试使用fork、vfork 和其他类似功能。这是我正在尝试的程序:
#include <sched.h> //Clone resides here
#include <stdlib.h> //standard library
#include <stdio.h>
#include <time.h>
#include <limits.h>
#include <sys/shm.h>
#include <errno.h>
#include <sys/sem.h>
#include <signal.h>
#include <sys/types.h>
int helloWorld();
int main(int argc, char *argv[])
{
int (*functionPointer)() = &helloWorld; //The first argument of clone accepts a pointer to a function which must return int
void **childStack = (void**)malloc(1024); //We will give our child 1kB of stack space
clone(functionPointer, childStack, 0, NULL); //First arugment is the function to be called, second one is our stack, CLONE_VM means to share memory, last NULL PID description
return 0;
}
int helloWorld()
{
printf("Hello (clone) world!\r\n");
return 0;
}
使用gcc -o test my_file.c 编译得到:
Undefined symbols for architecture x86_64:
"_clone", referenced from:
_main in ccG3qOjx.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
请随意忽略 cmets,因为我只是在学习。还有一件事..如果我尝试在参数中传递CLONE_VM 它甚至不会编译给我错误:
my_file.c: In function ‘main’:
my_file.c:12: error: ‘CLONE_VM’ undeclared (first use in this function)
my_file.c:12: error: (Each undeclared identifier is reported only once
my_file.c:12: error: for each function it appears in.)
我错过了#include 吗?如果有,是哪一个?
我做错了什么以及如何解决?
【问题讨论】: