include/linux/restart_block.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Common syscall restarting data
   4  */
   5 #ifndef __LINUX_RESTART_BLOCK_H
   6 #define __LINUX_RESTART_BLOCK_H
   7
   8 #include <linux/compiler.h>
   9 #include <linux/types.h>
  10
  11 struct timespec;
  12 struct compat_timespec;
  13 struct pollfd;
  14
  15 enum timespec_type {
  16         TT_NONE         = 0,
  17         TT_NATIVE       = 1,
  18 #ifdef CONFIG_COMPAT
  19         TT_COMPAT       = 2,
  20 #endif
  21 };
  22
  23 /*
  24  * System call restart block.
  25  */
  26 struct restart_block {
  27         long (*fn)(struct restart_block *);
  28         union {
  29                 /* For futex_wait and futex_wait_requeue_pi */
  30                 struct {
  31                         u32 __user *uaddr;
  32                         u32 val;
  33                         u32 flags;
  34                         u32 bitset;
  35                         u64 time;
  36                         u32 __user *uaddr2;
  37                 } futex;
  38                 /* For nanosleep */
  39                 struct {
  40                         clockid_t clockid;
  41                         enum timespec_type type;
  42                         union {
  43                                 struct timespec __user *rmtp;
  44 #ifdef CONFIG_COMPAT
  45                                 struct compat_timespec __user *compat_rmtp;
  46 #endif
  47                         };
  48                         u64 expires;
  49                 } nanosleep;
  50                 /* For poll */
  51                 struct {
  52                         struct pollfd __user *ufds;
  53                         int nfds;
  54                         int has_timeout;
  55                         unsigned long tv_sec;
  56                         unsigned long tv_nsec;
  57                 } poll;
  58         };
  59 };
  60
  61 extern long do_no_restart_syscall(struct restart_block *parm);
  62
  63 #endif /* __LINUX_RESTART_BLOCK_H */