Here is the code for sys_fork in Linux 2.6.24.
asmlinkage int sys_fork(struct pt_regs regs)
{
return do_fork(SIGCHLD, regs.esp, ®s, 0, NULL, NULL);
}
It seems child process base is a little different than his parent!
Here is the code for sys_fork in Linux 2.6.24.
asmlinkage int sys_fork(struct pt_regs regs)
{
return do_fork(SIGCHLD, regs.esp, ®s, 0, NULL, NULL);
}
It seems child process base is a little different than his parent!
fork在英文中是叉子,分叉的意思,在函数fork中,取后面的意思。很形象的表示程序从这里分叉,fork函数创建了子进程,子进程和父进程同时(其实是cpu分时处理)开始运行分叉之后的程序。如果fork成功,子进程中fork的返回值是0,父进程中fork的返回值是子进程的进程号,getpid()返回的才是各自真是的进程号。 先看这段范例代码:#include unistd.h>; ......
答案就在这里:fork in Linux
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