include/uapi/asm-generic/msgbuf.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef __ASM_GENERIC_MSGBUF_H
   3 #define __ASM_GENERIC_MSGBUF_H
   4
   5 #include <asm/bitsperlong.h>
   6 #include <asm/ipcbuf.h>
   7
   8 /*
   9  * generic msqid64_ds structure.
  10  *
  11  * Note extra padding because this structure is passed back and forth
  12  * between kernel and user space.
  13  *
  14  * msqid64_ds was originally meant to be architecture specific, but
  15  * everyone just ended up making identical copies without specific
  16  * optimizations, so we may just as well all use the same one.
  17  *
  18  * 64 bit architectures use a 64-bit long time field here, while
  19  * 32 bit architectures have a pair of unsigned long values.
  20  * On big-endian systems, the lower half is in the wrong place.
  21  *
  22  * Pad space is left for:
  23  * - 2 miscellaneous 32-bit values
  24  */
  25
  26 struct msqid64_ds {
  27         struct ipc64_perm msg_perm;
  28 #if __BITS_PER_LONG == 64
  29         long             msg_stime;     /* last msgsnd time */
  30         long             msg_rtime;     /* last msgrcv time */
  31         long             msg_ctime;     /* last change time */
  32 #else
  33         unsigned long   msg_stime;      /* last msgsnd time */
  34         unsigned long   msg_stime_high;
  35         unsigned long   msg_rtime;      /* last msgrcv time */
  36         unsigned long   msg_rtime_high;
  37         unsigned long   msg_ctime;      /* last change time */
  38         unsigned long   msg_ctime_high;
  39 #endif
  40         unsigned long   msg_cbytes;     /* current number of bytes on queue */
  41         unsigned long   msg_qnum;       /* number of messages in queue */
  42         unsigned long    msg_qbytes;    /* max number of bytes on queue */
  43         __kernel_pid_t msg_lspid;       /* pid of last msgsnd */
  44         __kernel_pid_t msg_lrpid;       /* last receive pid */
  45         unsigned long    __unused4;
  46         unsigned long    __unused5;
  47 };
  48
  49 #endif /* __ASM_GENERIC_MSGBUF_H */