shipinsky的博客

#define __NR_getpid 172__SYSCALL(__NR_getpid, sys_getpid) =>SYSCALL_DEFINE0(getpid) // sys_getpid - return the thread group id of the current process { return task_tgid_vnr(current); =>pid_t task_tgid_vnr(struct task_struct *tsk) { retur.

voiddo_group_exit(int exit_code){ struct signal_struct *sig = current->signal; if (signal_group_exit(sig)) exit_code = sig->group_exit_code; else if (!thread_group_empty(current)) { struct sighand_struct *const sighand = current->sigha.

慢慢欣赏linux 进程创建的时候堆栈的建立long _do_fork(unsigned long clone_flags, unsigned long stack_start, unsigned long stack_size, int __user *parent_tidptr, int __user *child_tidptr, unsigned long tls){ p = copy_process(clone_flags.

do_fork =>struct pid *pid = alloc_pid(); =>struct pid *pid = kmem_cache_alloc(pid_cachep, GFP_KERNEL);//分配pid结构体空间 =>nr = alloc_pidmap(current->nsproxy->pid_ns);//分配PID进程号 =>...

ENTRY(entry_SYSCALL_64) movq %rsp, PER_CPU_VAR(rsp_scratch) // 保存用户堆栈指针 movq PER_CPU_VAR(cpu_current_top_of_stack), %rsp // 获取tss段作为内核栈 =># define cpu_current_top_of_stack (cpu_tss_rw + TSS_sp1) /* 讲用户寄存器压到tss段 */ /* Construct struct pt_regs on.

不要过多自信，调用系统调用的时候想，恩，我的代码肯定不会有问题。这个世界最怕认真两个字，最不怕的是膨胀。当系统调用mmap或者别的系统调用返回失败，而这个问题很难复现的话，你就悲剧了。系统调用内部依赖于太多的周边环境，很容易出错。调用系统调用注意打印返回值和error信息。