include/linux/shm.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_SHM_H_
   3 #define _LINUX_SHM_H_
   4
   5 #include <linux/types.h>
   6 #include <asm/page.h>
   7 #include <asm/shmparam.h>
   8
   9 struct file;
  10 struct task_struct;
  11
  12 #ifdef CONFIG_SYSVIPC
  13 struct sysv_shm {
  14         struct list_head shm_clist;
  15 };
  16
  17 long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
  18               unsigned long shmlba);
  19 void exit_shm(struct task_struct *task);
  20 #define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
  21 #else
  22 struct sysv_shm {
  23         /* empty */
  24 };
  25
  26 static inline long do_shmat(int shmid, char __user *shmaddr,
  27                             int shmflg, unsigned long *addr,
  28                             unsigned long shmlba)
  29 {
  30         return -ENOSYS;
  31 }
  32 static inline void exit_shm(struct task_struct *task)
  33 {
  34 }
  35 static inline void shm_init_task(struct task_struct *task)
  36 {
  37 }
  38 #endif
  39
  40 #endif /* _LINUX_SHM_H_ */