linux/include/uapi/asm-generic/msgbuf.h at master · fabgithub/linux · GitHub

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#ifndef __ASM_GENERIC_MSGBUF_H

#define __ASM_GENERIC_MSGBUF_H

#include <asm/bitsperlong.h>

* generic msqid64_ds structure.

* Note extra padding because this structure is passed back and forth

* between kernel and user space.

* msqid64_ds was originally meant to be architecture specific, but

* everyone just ended up making identical copies without specific

* optimizations, so we may just as well all use the same one.

* 64 bit architectures typically define a 64 bit __kernel_time_t,

* so they do not need the first three padding words.

* On big-endian systems, the padding is in the wrong place.

* Pad space is left for:

* - 64-bit time_t to solve y2038 problem

* - 2 miscellaneous 32-bit values

struct msqid64_ds {

struct ipc64_perm msg_perm;

__kernel_time_t msg_stime; /* last msgsnd time */

#if __BITS_PER_LONG != 64

unsigned long __unused1;

#endif

__kernel_time_t msg_rtime; /* last msgrcv time */

#if __BITS_PER_LONG != 64

unsigned long __unused2;

#endif

__kernel_time_t msg_ctime; /* last change time */

#if __BITS_PER_LONG != 64

unsigned long __unused3;

#endif

unsigned long msg_cbytes; /* current number of bytes on queue */

unsigned long msg_qnum; /* number of messages in queue */

unsigned long msg_qbytes; /* max number of bytes on queue */

__kernel_pid_t msg_lspid; /* pid of last msgsnd */

__kernel_pid_t msg_lrpid; /* last receive pid */

unsigned long __unused4;

unsigned long __unused5;

};

#endif /* __ASM_GENERIC_MSGBUF_H */

linux/include/uapi/asm-generic/msgbuf.h at master · fabgithub/linux · GitHub

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