NORET_TYPE void do_exit(long code) { struct task_struct *tsk = current; if (in_interrupt()) panic("Aiee, killing interrupt handler!"); if (!tsk->pid) panic("Attempted to kill the idle task!"); if (tsk->pid == 1) panic("Attempted to kill init!"); tsk->flags |= PF_EXITING; del_timer_sync(&tsk->real_timer); fake_volatile: #ifdef CONFIG_BSD_PROCESS_ACCT acct_process(code); #endif if (current->tux_info) { #ifdef CONFIG_TUX_DEBUG printk("Possibly unexpected TUX-thread exit(%ld) at %p?\n", code, __builtin_return_address(0)); #endif current->tux_exit(); } __exit_mm(tsk); lock_kernel(); sem_exit(); __exit_files(tsk); __exit_fs(tsk); exit_namespace(tsk); exit_sighand(tsk); exit_thread(); if (current->leader) disassociate_ctty(1); put_exec_domain(tsk->exec_domain); if (tsk->binfmt && tsk->binfmt->module) __MOD_DEC_USE_COUNT(tsk->binfmt->module); tsk->exit_code = code; exit_notify(); schedule(); BUG(); /* * In order to get rid of the "volatile function does return" message * I did this little loop that confuses gcc to think do_exit really * is volatile. In fact it's schedule() that is volatile in some * circumstances: when current->state = ZOMBIE, schedule() never * returns. * * In fact the natural way to do all this is to have the label and the * goto right after each other, but I put the fake_volatile label at * the start of the function just in case something /really/ bad * happens, and the schedule returns. This way we can try again. I'm * not paranoid: it's just that everybody is out to get me. */ goto fake_volatile; }
int tty_ioctl(struct inode * inode, struct file * file, unsigned int cmd, unsigned long arg) { struct tty_struct * tty; struct tty_struct * other_tty; struct tty_struct * termios_tty; pid_t pgrp; int dev; int termios_dev; int retval; if (MAJOR(file->f_rdev) != TTY_MAJOR) { printk("tty_ioctl: tty pseudo-major != TTY_MAJOR\n"); return -EINVAL; } dev = MINOR(file->f_rdev); tty = TTY_TABLE(dev); if (!tty) return -EINVAL; if (IS_A_PTY(dev)) other_tty = tty_table[PTY_OTHER(dev)]; else other_tty = NULL; if (IS_A_PTY_MASTER(dev)) { termios_tty = other_tty; termios_dev = PTY_OTHER(dev); } else { termios_tty = tty; termios_dev = dev; } switch (cmd) { case TCGETS: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (struct termios)); if (retval) return retval; memcpy_tofs((struct termios *) arg, termios_tty->termios, sizeof (struct termios)); return 0; case TCSETSF: case TCSETSW: case TCSETS: retval = check_change(termios_tty, termios_dev); if (retval) return retval; if (cmd == TCSETSF || cmd == TCSETSW) { if (cmd == TCSETSF) flush_input(termios_tty); wait_until_sent(termios_tty, 0); } return set_termios(termios_tty, (struct termios *) arg, termios_dev); case TCGETA: return get_termio(termios_tty,(struct termio *) arg); case TCSETAF: case TCSETAW: case TCSETA: retval = check_change(termios_tty, termios_dev); if (retval) return retval; if (cmd == TCSETAF || cmd == TCSETAW) { if (cmd == TCSETAF) flush_input(termios_tty); wait_until_sent(termios_tty, 0); } return set_termio(termios_tty, (struct termio *) arg, termios_dev); case TCXONC: retval = check_change(tty, dev); if (retval) return retval; switch (arg) { case TCOOFF: stop_tty(tty); break; case TCOON: start_tty(tty); break; case TCIOFF: if (STOP_CHAR(tty) != __DISABLED_CHAR) put_tty_queue(STOP_CHAR(tty), &tty->write_q); break; case TCION: if (START_CHAR(tty) != __DISABLED_CHAR) put_tty_queue(START_CHAR(tty), &tty->write_q); break; default: return -EINVAL; } return 0; case TCFLSH: retval = check_change(tty, dev); if (retval) return retval; switch (arg) { case TCIFLUSH: flush_input(tty); break; case TCIOFLUSH: flush_input(tty); /* fall through */ case TCOFLUSH: flush_output(tty); break; default: return -EINVAL; } return 0; case TIOCEXCL: set_bit(TTY_EXCLUSIVE, &tty->flags); return 0; case TIOCNXCL: clear_bit(TTY_EXCLUSIVE, &tty->flags); return 0; case TIOCSCTTY: if (current->leader && (current->session == tty->session)) return 0; /* * The process must be a session leader and * not have a controlling tty already. */ if (!current->leader || (current->tty >= 0)) return -EPERM; if (tty->session > 0) { /* * This tty is already the controlling * tty for another session group! */ if ((arg == 1) && suser()) { /* * Steal it away */ struct task_struct *p; for_each_task(p) if (p->tty == dev) p->tty = -1; } else return -EPERM; } current->tty = dev; tty->session = current->session; tty->pgrp = current->pgrp; return 0; case TIOCGPGRP: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (pid_t)); if (retval) return retval; if (current->tty != termios_dev) return -ENOTTY; put_fs_long(termios_tty->pgrp, (pid_t *) arg); return 0; case TIOCSPGRP: retval = check_change(termios_tty, termios_dev); if (retval) return retval; if ((current->tty < 0) || (current->tty != termios_dev) || (termios_tty->session != current->session)) return -ENOTTY; pgrp = get_fs_long((pid_t *) arg); if (pgrp < 0) return -EINVAL; if (session_of_pgrp(pgrp) != current->session) return -EPERM; termios_tty->pgrp = pgrp; return 0; case TIOCOUTQ: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (unsigned long)); if (retval) return retval; put_fs_long(CHARS(&tty->write_q), (unsigned long *) arg); return 0; case TIOCINQ: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (unsigned long)); if (retval) return retval; if (L_ICANON(tty)) put_fs_long(inq_canon(tty), (unsigned long *) arg); else put_fs_long(CHARS(&tty->secondary), (unsigned long *) arg); return 0; case TIOCSTI: if ((current->tty != dev) && !suser()) return -EPERM; retval = verify_area(VERIFY_READ, (void *) arg, 1); if (retval) return retval; put_tty_queue(get_fs_byte((char *) arg), &tty->read_q); TTY_READ_FLUSH(tty); return 0; case TIOCGWINSZ: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (struct winsize)); if (retval) return retval; memcpy_tofs((struct winsize *) arg, &tty->winsize, sizeof (struct winsize)); return 0; case TIOCSWINSZ: if (IS_A_PTY_MASTER(dev)) set_window_size(other_tty,(struct winsize *) arg); return set_window_size(tty,(struct winsize *) arg); case TIOCLINUX: switch (get_fs_byte((char *)arg)) { case 0: return do_screendump(arg); case 1: return do_get_ps_info(arg); #ifdef CONFIG_SELECTION case 2: return set_selection(arg); case 3: return paste_selection(tty); case 4: unblank_screen(); return 0; #endif /* CONFIG_SELECTION */ default: return -EINVAL; } case TIOCCONS: if (IS_A_CONSOLE(dev)) { if (!suser()) return -EPERM; redirect = NULL; return 0; } if (redirect) return -EBUSY; if (!suser()) return -EPERM; if (IS_A_PTY_MASTER(dev)) redirect = other_tty; else if (IS_A_PTY_SLAVE(dev)) redirect = tty; else return -ENOTTY; return 0; case FIONBIO: arg = get_fs_long((unsigned long *) arg); if (arg) file->f_flags |= O_NONBLOCK; else file->f_flags &= ~O_NONBLOCK; return 0; case TIOCNOTTY: if (current->tty != dev) return -ENOTTY; if (current->leader) disassociate_ctty(0); current->tty = -1; return 0; case TIOCGETD: retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (unsigned long)); if (retval) return retval; put_fs_long(tty->disc, (unsigned long *) arg); return 0; case TIOCSETD: retval = check_change(tty, dev); if (retval) return retval; arg = get_fs_long((unsigned long *) arg); return tty_set_ldisc(tty, arg); case TIOCGLCKTRMIOS: arg = get_fs_long((unsigned long *) arg); retval = verify_area(VERIFY_WRITE, (void *) arg, sizeof (struct termios)); if (retval) return retval; memcpy_tofs((struct termios *) arg, &termios_locked[termios_dev], sizeof (struct termios)); return 0; case TIOCSLCKTRMIOS: if (!suser()) return -EPERM; arg = get_fs_long((unsigned long *) arg); memcpy_fromfs(&termios_locked[termios_dev], (struct termios *) arg, sizeof (struct termios)); return 0; case TIOCPKT: if (!IS_A_PTY_MASTER(dev)) return -ENOTTY; retval = verify_area(VERIFY_READ, (void *) arg, sizeof (unsigned long)); if (retval) return retval; if (get_fs_long(arg)) { if (!tty->packet) { tty->packet = 1; tty->link->ctrl_status = 0; } } else tty->packet = 0; return 0; case TCSBRK: case TCSBRKP: retval = check_change(tty, dev); if (retval) return retval; wait_until_sent(tty, 0); if (!tty->ioctl) return 0; tty->ioctl(tty, file, cmd, arg); return 0; default: if (tty->ioctl) { retval = (tty->ioctl)(tty, file, cmd, arg); if (retval != -EINVAL) return retval; } if (ldiscs[tty->disc].ioctl) { retval = (ldiscs[tty->disc].ioctl) (tty, file, cmd, arg); return retval; } return -EINVAL; }
NORET_TYPE void do_exit(long code) { struct task_struct *tsk = current; if (in_interrupt()) panic("Aiee, killing interrupt handler!"); if (!tsk->pid) panic("Attempted to kill the idle task!"); if (tsk->pid == 1) panic("Attempted to kill init!"); /* * If do_exit is called because this processes oopsed, it's possible * that get_fs() was left as KERNEL_DS, so reset it to USER_DS before * continuing. Amongst other possible reasons, this is to prevent * mm_release()->clear_child_tid() from writing to a user-controlled * kernel address. */ set_fs(USER_DS); tsk->flags |= PF_EXITING; del_timer_sync(&tsk->real_timer); fake_volatile: #ifdef CONFIG_BSD_PROCESS_ACCT acct_process(code); #endif __exit_mm(tsk); lock_kernel(); sem_exit(); __exit_files(tsk); __exit_fs(tsk); exit_namespace(tsk); exit_sighand(tsk); exit_thread(); if (current->leader) disassociate_ctty(1); put_exec_domain(tsk->exec_domain); if (tsk->binfmt && tsk->binfmt->module) __MOD_DEC_USE_COUNT(tsk->binfmt->module); tsk->exit_code = code; exit_notify(); schedule(); BUG(); /* * In order to get rid of the "volatile function does return" message * I did this little loop that confuses gcc to think do_exit really * is volatile. In fact it's schedule() that is volatile in some * circumstances: when current->state = ZOMBIE, schedule() never * returns. * * In fact the natural way to do all this is to have the label and the * goto right after each other, but I put the fake_volatile label at * the start of the function just in case something /really/ bad * happens, and the schedule returns. This way we can try again. I'm * not paranoid: it's just that everybody is out to get me. */ goto fake_volatile; }
/* * Send signals to all our closest relatives so that they know * to properly mourn us.. */ static void exit_notify(void) { struct task_struct * p, *t; forget_original_parent(current); /* * Check to see if any process groups have become orphaned * as a result of our exiting, and if they have any stopped * jobs, send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) * * Case i: Our father is in a different pgrp than we are * and we were the only connection outside, so our pgrp * is about to become orphaned. */ t = current->p_pptr; if ((t->pgrp != current->pgrp) && (t->session == current->session) && will_become_orphaned_pgrp(current->pgrp, current) && has_stopped_jobs(current->pgrp)) { kill_pg(current->pgrp,SIGHUP,1); kill_pg(current->pgrp,SIGCONT,1); } /* Let father know we died * * Thread signals are configurable, but you aren't going to use * that to send signals to arbitary processes. * That stops right now. * * If the parent exec id doesn't match the exec id we saved * when we started then we know the parent has changed security * domain. * * If our self_exec id doesn't match our parent_exec_id then * we have changed execution domain as these two values started * the same after a fork. * */ if(current->exit_signal != SIGCHLD && ( current->parent_exec_id != t->self_exec_id || current->self_exec_id != current->parent_exec_id) && !capable(CAP_KILL)) current->exit_signal = SIGCHLD; notify_parent(current, current->exit_signal); /* * This loop does two things: * * A. Make init inherit all the child processes * B. Check to see if any process groups have become orphaned * as a result of our exiting, and if they have any stopped * jobs, send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) */ write_lock_irq(&tasklist_lock); while (current->p_cptr != NULL) { p = current->p_cptr; current->p_cptr = p->p_osptr; p->p_ysptr = NULL; p->flags &= ~(PF_PTRACED|PF_TRACESYS); p->p_pptr = p->p_opptr; p->p_osptr = p->p_pptr->p_cptr; if (p->p_osptr) p->p_osptr->p_ysptr = p; p->p_pptr->p_cptr = p; if (p->state == TASK_ZOMBIE) notify_parent(p, p->exit_signal); /* * process group orphan check * Case ii: Our child is in a different pgrp * than we are, and it was the only connection * outside, so the child pgrp is now orphaned. */ if ((p->pgrp != current->pgrp) && (p->session == current->session)) { int pgrp = p->pgrp; write_unlock_irq(&tasklist_lock); if (is_orphaned_pgrp(pgrp) && has_stopped_jobs(pgrp)) { kill_pg(pgrp,SIGHUP,1); kill_pg(pgrp,SIGCONT,1); } write_lock_irq(&tasklist_lock); } } write_unlock_irq(&tasklist_lock); if (current->leader) disassociate_ctty(1); }
NORET_TYPE void do_exit(long code) { struct task_struct *p; int i; fake_volatile: if (current->semun) sem_exit(); if (current->shm) shm_exit(); free_page_tables(current); for (i=0 ; i<NR_OPEN ; i++) if (current->filp[i]) sys_close(i); forget_original_parent(current); iput(current->pwd); current->pwd = NULL; iput(current->root); current->root = NULL; iput(current->executable); current->executable = NULL; /* Release all of the old mmap stuff. */ { struct vm_area_struct * mpnt, *mpnt1; mpnt = current->mmap; current->mmap = NULL; while (mpnt) { mpnt1 = mpnt->vm_next; if (mpnt->vm_ops && mpnt->vm_ops->close) mpnt->vm_ops->close(mpnt); kfree(mpnt); mpnt = mpnt1; } } if (current->ldt) { vfree(current->ldt); current->ldt = NULL; for (i=1 ; i<NR_TASKS ; i++) { if (task[i] == current) { set_ldt_desc(gdt+(i<<1)+FIRST_LDT_ENTRY, &default_ldt, 1); load_ldt(i); } } } current->state = TASK_ZOMBIE; current->exit_code = code; current->rss = 0; /* * Check to see if any process groups have become orphaned * as a result of our exiting, and if they have any stopped * jobs, send them a SIGUP and then a SIGCONT. (POSIX 3.2.2.2) * * Case i: Our father is in a different pgrp than we are * and we were the only connection outside, so our pgrp * is about to become orphaned. */ if ((current->p_pptr->pgrp != current->pgrp) && (current->p_pptr->session == current->session) && is_orphaned_pgrp(current->pgrp) && has_stopped_jobs(current->pgrp)) { kill_pg(current->pgrp,SIGHUP,1); kill_pg(current->pgrp,SIGCONT,1); } /* Let father know we died */ /* 通知父进程 */ notify_parent(current); /* * This loop does two things: * * A. Make init inherit all the child processes * B. Check to see if any process groups have become orphaned * as a result of our exiting, and if they have any stopped * jobs, send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) */ while ((p = current->p_cptr) != NULL) { current->p_cptr = p->p_osptr; p->p_ysptr = NULL; p->flags &= ~(PF_PTRACED|PF_TRACESYS); if (task[1] && task[1] != current) p->p_pptr = task[1]; else p->p_pptr = task[0]; p->p_osptr = p->p_pptr->p_cptr; p->p_osptr->p_ysptr = p; p->p_pptr->p_cptr = p; if (p->state == TASK_ZOMBIE) notify_parent(p); /* * process group orphan check * Case ii: Our child is in a different pgrp * than we are, and it was the only connection * outside, so the child pgrp is now orphaned. */ if ((p->pgrp != current->pgrp) && (p->session == current->session) && is_orphaned_pgrp(p->pgrp) && has_stopped_jobs(p->pgrp)) { kill_pg(p->pgrp,SIGHUP,1); kill_pg(p->pgrp,SIGCONT,1); } } if (current->leader) disassociate_ctty(1); if (last_task_used_math == current) last_task_used_math = NULL; #ifdef DEBUG_PROC_TREE audit_ptree(); #endif schedule(); /* * In order to get rid of the "volatile function does return" message * I did this little loop that confuses gcc to think do_exit really * is volatile. In fact it's schedule() that is volatile in some * circumstances: when current->state = ZOMBIE, schedule() never * returns. * * In fact the natural way to do all this is to have the label and the * goto right after each other, but I put the fake_volatile label at * the start of the function just in case something /really/ bad * happens, and the schedule returns. This way we can try again. I'm * not paranoid: it's just that everybody is out to get me. */ goto fake_volatile; }
/* * Send signals to all our closest relatives so that they know * to properly mourn us.. */ static void exit_notify(void) { struct task_struct * p; forget_original_parent(current); /* * Check to see if any process groups have become orphaned * as a result of our exiting, and if they have any stopped * jobs, send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) * * Case i: Our father is in a different pgrp than we are * and we were the only connection outside, so our pgrp * is about to become orphaned. */ if ((current->p_pptr->pgrp != current->pgrp) && (current->p_pptr->session == current->session) && will_become_orphaned_pgrp(current->pgrp, current) && has_stopped_jobs(current->pgrp)) { kill_pg(current->pgrp,SIGHUP,1); kill_pg(current->pgrp,SIGCONT,1); } /* Let father know we died */ notify_parent(current); /* * This loop does two things: * * A. Make init inherit all the child processes * B. Check to see if any process groups have become orphaned * as a result of our exiting, and if they have any stopped * jobs, send them a SIGHUP and then a SIGCONT. (POSIX 3.2.2.2) */ while ((p = current->p_cptr) != NULL) { current->p_cptr = p->p_osptr; p->p_ysptr = NULL; p->flags &= ~(PF_PTRACED|PF_TRACESYS); if (task[smp_num_cpus] && task[smp_num_cpus] != current) /* init */ p->p_pptr = task[smp_num_cpus]; else p->p_pptr = task[0]; p->p_osptr = p->p_pptr->p_cptr; p->p_osptr->p_ysptr = p; p->p_pptr->p_cptr = p; if (p->state == TASK_ZOMBIE) notify_parent(p); /* * process group orphan check * Case ii: Our child is in a different pgrp * than we are, and it was the only connection * outside, so the child pgrp is now orphaned. */ if ((p->pgrp != current->pgrp) && (p->session == current->session) && is_orphaned_pgrp(p->pgrp) && has_stopped_jobs(p->pgrp)) { kill_pg(p->pgrp,SIGHUP,1); kill_pg(p->pgrp,SIGCONT,1); } } if (current->leader) disassociate_ctty(1); }