297 lines
6.9 KiB
C
297 lines
6.9 KiB
C
/*
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* Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
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* Licensed under the GPL
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*/
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#include "linux/sched.h"
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#include "linux/file.h"
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#include "linux/smp_lock.h"
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#include "linux/mm.h"
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#include "linux/utsname.h"
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#include "linux/msg.h"
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#include "linux/shm.h"
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#include "linux/sys.h"
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#include "linux/syscalls.h"
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#include "linux/unistd.h"
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#include "linux/slab.h"
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#include "linux/utime.h"
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#include "asm/mman.h"
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#include "asm/uaccess.h"
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#include "asm/ipc.h"
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#include "kern_util.h"
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#include "user_util.h"
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#include "sysdep/syscalls.h"
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#include "mode_kern.h"
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#include "choose-mode.h"
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/* Unlocked, I don't care if this is a bit off */
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int nsyscalls = 0;
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long um_mount(char * dev_name, char * dir_name, char * type,
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unsigned long new_flags, void * data)
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{
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if(type == NULL) type = "";
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return(sys_mount(dev_name, dir_name, type, new_flags, data));
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}
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long sys_fork(void)
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{
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long ret;
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current->thread.forking = 1;
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ret = do_fork(SIGCHLD, 0, NULL, 0, NULL, NULL);
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current->thread.forking = 0;
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return(ret);
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}
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long sys_vfork(void)
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{
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long ret;
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current->thread.forking = 1;
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ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, NULL, 0, NULL,
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NULL);
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current->thread.forking = 0;
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return(ret);
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}
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/* common code for old and new mmaps */
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static inline long do_mmap2(
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unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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int error = -EBADF;
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struct file * file = NULL;
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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if (!(flags & MAP_ANONYMOUS)) {
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file = fget(fd);
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if (!file)
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goto out;
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}
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down_write(¤t->mm->mmap_sem);
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error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
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up_write(¤t->mm->mmap_sem);
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if (file)
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fput(file);
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out:
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return error;
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}
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long sys_mmap2(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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return do_mmap2(addr, len, prot, flags, fd, pgoff);
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}
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/*
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* Perform the select(nd, in, out, ex, tv) and mmap() system
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* calls. Linux/i386 didn't use to be able to handle more than
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* 4 system call parameters, so these system calls used a memory
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* block for parameter passing..
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*/
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struct mmap_arg_struct {
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unsigned long addr;
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unsigned long len;
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unsigned long prot;
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unsigned long flags;
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unsigned long fd;
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unsigned long offset;
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};
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long old_mmap(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long offset)
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{
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long err = -EINVAL;
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if (offset & ~PAGE_MASK)
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goto out;
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err = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
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out:
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return err;
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}
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/*
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* sys_pipe() is the normal C calling standard for creating
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* a pipe. It's not the way unix traditionally does this, though.
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*/
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long sys_pipe(unsigned long * fildes)
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{
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int fd[2];
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long error;
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error = do_pipe(fd);
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if (!error) {
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if (copy_to_user(fildes, fd, sizeof(fd)))
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error = -EFAULT;
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}
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return error;
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}
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/*
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* sys_ipc() is the de-multiplexer for the SysV IPC calls..
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*
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* This is really horribly ugly.
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*/
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int sys_ipc (uint call, int first, int second,
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int third, void *ptr, long fifth)
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{
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int version, ret;
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version = call >> 16; /* hack for backward compatibility */
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call &= 0xffff;
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switch (call) {
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case SEMOP:
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return sys_semtimedop(first, (struct sembuf *) ptr, second,
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NULL);
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case SEMTIMEDOP:
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return sys_semtimedop(first, (struct sembuf *) ptr, second,
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(const struct timespec *) fifth);
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case SEMGET:
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return sys_semget (first, second, third);
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case SEMCTL: {
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union semun fourth;
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if (!ptr)
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return -EINVAL;
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if (get_user(fourth.__pad, (void **) ptr))
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return -EFAULT;
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return sys_semctl (first, second, third, fourth);
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}
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case MSGSND:
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return sys_msgsnd (first, (struct msgbuf *) ptr,
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second, third);
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case MSGRCV:
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switch (version) {
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case 0: {
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struct ipc_kludge tmp;
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if (!ptr)
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return -EINVAL;
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if (copy_from_user(&tmp,
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(struct ipc_kludge *) ptr,
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sizeof (tmp)))
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return -EFAULT;
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return sys_msgrcv (first, tmp.msgp, second,
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tmp.msgtyp, third);
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}
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default:
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panic("msgrcv with version != 0");
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return sys_msgrcv (first,
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(struct msgbuf *) ptr,
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second, fifth, third);
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}
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case MSGGET:
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return sys_msgget ((key_t) first, second);
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case MSGCTL:
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return sys_msgctl (first, second, (struct msqid_ds *) ptr);
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case SHMAT:
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switch (version) {
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default: {
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ulong raddr;
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ret = do_shmat (first, (char *) ptr, second, &raddr);
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if (ret)
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return ret;
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return put_user (raddr, (ulong *) third);
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}
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case 1: /* iBCS2 emulator entry point */
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if (!segment_eq(get_fs(), get_ds()))
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return -EINVAL;
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return do_shmat (first, (char *) ptr, second, (ulong *) third);
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}
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case SHMDT:
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return sys_shmdt ((char *)ptr);
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case SHMGET:
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return sys_shmget (first, second, third);
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case SHMCTL:
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return sys_shmctl (first, second,
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(struct shmid_ds *) ptr);
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default:
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return -ENOSYS;
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}
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}
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long sys_uname(struct old_utsname * name)
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{
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long err;
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if (!name)
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return -EFAULT;
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down_read(&uts_sem);
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err=copy_to_user(name, &system_utsname, sizeof (*name));
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up_read(&uts_sem);
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return err?-EFAULT:0;
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}
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long sys_olduname(struct oldold_utsname * name)
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{
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long error;
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if (!name)
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return -EFAULT;
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if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
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return -EFAULT;
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down_read(&uts_sem);
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error = __copy_to_user(&name->sysname,&system_utsname.sysname,
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__OLD_UTS_LEN);
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error |= __put_user(0,name->sysname+__OLD_UTS_LEN);
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error |= __copy_to_user(&name->nodename,&system_utsname.nodename,
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__OLD_UTS_LEN);
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error |= __put_user(0,name->nodename+__OLD_UTS_LEN);
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error |= __copy_to_user(&name->release,&system_utsname.release,
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__OLD_UTS_LEN);
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error |= __put_user(0,name->release+__OLD_UTS_LEN);
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error |= __copy_to_user(&name->version,&system_utsname.version,
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__OLD_UTS_LEN);
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error |= __put_user(0,name->version+__OLD_UTS_LEN);
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error |= __copy_to_user(&name->machine,&system_utsname.machine,
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__OLD_UTS_LEN);
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error |= __put_user(0,name->machine+__OLD_UTS_LEN);
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up_read(&uts_sem);
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error = error ? -EFAULT : 0;
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return error;
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}
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long execute_syscall(void *r)
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{
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return(CHOOSE_MODE_PROC(execute_syscall_tt, execute_syscall_skas, r));
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}
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spinlock_t syscall_lock = SPIN_LOCK_UNLOCKED;
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static int syscall_index = 0;
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int next_syscall_index(int limit)
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{
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int ret;
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spin_lock(&syscall_lock);
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ret = syscall_index;
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if(++syscall_index == limit)
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syscall_index = 0;
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spin_unlock(&syscall_lock);
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return(ret);
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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