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/*
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* linux/kernel/exit.c
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*
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* (C) 1991 Linus Torvalds
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*/
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#include <errno.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/tty.h>
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#include <asm/segment.h>
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#include <unistd.h>//
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int sys_pause(void);
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int sys_close(int fd);
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void* thread_value[4096] = {};//
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void release(struct task_struct * p)
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{
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int i;
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if (!p)
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return;
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for (i=1 ; i<NR_TASKS ; i++)
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if (task[i]==p) {
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task[i]=NULL;
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free_page((long)p);
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schedule();
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return;
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}
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panic("trying to release non-existent task");
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}
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static inline int send_sig(long sig,struct task_struct * p,int priv)
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{
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if (!p || sig<1 || sig>32)
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return -EINVAL;
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if (priv || (current->euid==p->euid) || suser())
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p->signal |= (1<<(sig-1));
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else
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return -EPERM;
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return 0;
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}
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static void kill_session(void)
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{
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struct task_struct **p = NR_TASKS + task;
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while (--p > &FIRST_TASK) {
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if (*p && (*p)->session == current->session)
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(*p)->signal |= 1<<(SIGHUP-1);
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}
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}
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/*
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* XXX need to check permissions needed to send signals to process
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* groups, etc. etc. kill() permissions semantics are tricky!
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*/
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int sys_kill(int pid,int sig)
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{
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struct task_struct **p = NR_TASKS + task;
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int err, retval = 0;
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if (!pid) while (--p > &FIRST_TASK) {
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if (*p && (*p)->pgrp == current->pid)
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if (err=send_sig(sig,*p,1))
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retval = err;
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} else if (pid>0) while (--p > &FIRST_TASK) {
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if (*p && (*p)->pid == pid)
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if (err=send_sig(sig,*p,0))
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retval = err;
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} else if (pid == -1) while (--p > &FIRST_TASK)
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if (err = send_sig(sig,*p,0))
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retval = err;
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else while (--p > &FIRST_TASK)
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if (*p && (*p)->pgrp == -pid)
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if (err = send_sig(sig,*p,0))
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retval = err;
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return retval;
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}
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static void tell_father(int pid)
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{
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int i;
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if (pid)
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for (i=0;i<NR_TASKS;i++) {
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if (!task[i])
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continue;
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if (task[i]->pid != pid)
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continue;
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task[i]->signal |= (1<<(SIGCHLD-1));
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return;
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}
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/* if we don't find any fathers, we just release ourselves */
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/* This is not really OK. Must change it to make father 1 */
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printk("BAD BAD - no father found\n\r");
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release(current);
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}
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int do_exit(long code)
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{
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int i;
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free_page_tables(get_base(current->ldt[1]),get_limit(0x0f));
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free_page_tables(get_base(current->ldt[2]),get_limit(0x17));
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for (i=0 ; i<NR_TASKS ; i++)
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if (task[i] && task[i]->father == current->pid) {
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task[i]->father = 1;
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if (task[i]->state == TASK_ZOMBIE)
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/* assumption task[1] is always init */
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(void) send_sig(SIGCHLD, task[1], 1);
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}
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for (i=0 ; i<NR_OPEN ; i++)
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if (current->filp[i])
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sys_close(i);
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iput(current->pwd);
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current->pwd=NULL;
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iput(current->root);
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current->root=NULL;
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iput(current->executable);
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current->executable=NULL;
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if (current->leader && current->tty >= 0)
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tty_table[current->tty].pgrp = 0;
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if (last_task_used_math == current)
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last_task_used_math = NULL;
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if (current->leader)
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kill_session();
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current->state = TASK_ZOMBIE;
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current->exit_code = code;
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tell_father(current->father);
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schedule();
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return (-1); /* just to suppress warnings */
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}
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int sys_exit(int error_code)
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{
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return do_exit((error_code&0xff)<<8);
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}
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int sys_waitpid(pid_t pid,unsigned long * stat_addr, int options)
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{
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int flag, code;
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struct task_struct ** p;
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verify_area(stat_addr,4);
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repeat:
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flag=0;
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for(p = &LAST_TASK ; p > &FIRST_TASK ; --p) {
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if (!*p || *p == current)
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continue;
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if ((*p)->father != current->pid)
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continue;
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if (pid>0) {
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if ((*p)->pid != pid)
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continue;
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} else if (!pid) {
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if ((*p)->pgrp != current->pgrp)
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continue;
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} else if (pid != -1) {
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if ((*p)->pgrp != -pid)
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continue;
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}
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switch ((*p)->state) {
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case TASK_STOPPED:
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if (!(options & WUNTRACED))
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continue;
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put_fs_long(0x7f,stat_addr);
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return (*p)->pid;
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case TASK_ZOMBIE:
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current->cutime += (*p)->utime;
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current->cstime += (*p)->stime;
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flag = (*p)->pid;
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code = (*p)->exit_code;
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release(*p);
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put_fs_long(code,stat_addr);
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return flag;
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default:
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flag=1;
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continue;
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}
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}
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if (flag) {
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if (options & WNOHANG)
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return 0;
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current->state=TASK_INTERRUPTIBLE;
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schedule();
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if (!(current->signal &= ~(1<<(SIGCHLD-1))))
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goto repeat;
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else
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return -EINTR;
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}
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return -ECHILD;
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}
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int sys_thread_exit(void* value_ptr) /* ϵͳ<CFB5><CDB3><EFBFBD><EFBFBD>thread_exitʵ<74>ֺ<EFBFBD><D6BA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ο<EFBFBD><CEBF><EFBFBD>do_exit */
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{
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int i;
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pthread_t thread;
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free_page_tables(get_base(current->ldt[1]), get_limit(0x0f));
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free_page_tables(get_base(current->ldt[2]), get_limit(0x17));
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for (i = 0; i < NR_TASKS; i++)
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if (task[i] && task[i]->father == current->pid) {
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task[i]->father = 1;
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if (task[i]->state == TASK_ZOMBIE)
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/* assumption task[1] is always init */
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(void)send_sig(SIGCHLD, task[1], 1);
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}
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for (i = 0; i < NR_OPEN; i++)
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if (current->filp[i])
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sys_close(i);
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iput(current->pwd);
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current->pwd = NULL;
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iput(current->root);
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current->root = NULL;
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iput(current->executable);
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current->executable = NULL;
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if (current->leader && current->tty >= 0)
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tty_table[current->tty].pgrp = 0;
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if (last_task_used_math == current)
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last_task_used_math = NULL;
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if (current->leader)
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kill_session();
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current->state = TASK_ZOMBIE;
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thread = current->pid; /*<2A><>ǰ<EFBFBD>߳<EFBFBD>ID*/
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thread_value[thread] = value_ptr;
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tell_father(current->father);
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schedule();
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return (-1);
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}
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int sys_thread_join(pthread_t thread, void** value_ptr) /* ϵͳ<CFB5><CDB3><EFBFBD><EFBFBD>thread_exitʵ<74>ֺ<EFBFBD><D6BA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ο<EFBFBD><CEBF><EFBFBD>wait_pid */
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{
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if (thread <= 0 || value_ptr == NULL)
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{
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printk("Error:thread joining failed!\n");
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sys_exit(0);
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}
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int flag;
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struct task_struct** p;
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repeat:
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flag = 0;
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for (p = &LAST_TASK; p > &FIRST_TASK; --p)
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{
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if (!*p || *p == current)
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continue;
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if ((*p)->father != current->pid)
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continue;
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if ((*p)->pid != thread)
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continue;
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switch ((*p)->state)
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{
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case TASK_STOPPED:
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break;
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case TASK_ZOMBIE:
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current->cutime += (*p)->utime;
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current->cstime += (*p)->stime;
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release(*p);
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put_fs_long(thread_value[thread], value_ptr);
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return 0;
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default:
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flag = 1;
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break;
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}
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}
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if (flag) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if (!(current->signal &= ~(1 << (SIGCHLD - 1))))
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goto repeat;
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else
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return -EINTR;
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}
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return -ECHILD;
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}
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