/usr/mips64el-linux-gnuabi64/include/asm/msgbuf.h is in linux-libc-dev-mips64el-cross 4.15.0-18.19cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48  | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _ASM_MSGBUF_H
#define _ASM_MSGBUF_H
/*
 * The msqid64_ds structure for the MIPS architecture.
 * Note extra padding because this structure is passed back and forth
 * between kernel and user space.
 *
 * Pad space is left for:
 * - extension of time_t to 64-bit on 32-bitsystem to solve the y2038 problem
 * - 2 miscellaneous unsigned long values
 */
struct msqid64_ds {
	struct ipc64_perm msg_perm;
#if !defined(__mips64) && defined(__MIPSEB__)
	unsigned long	__unused1;
#endif
	__kernel_time_t msg_stime;	/* last msgsnd time */
#if !defined(__mips64) && defined(__MIPSEL__)
	unsigned long	__unused1;
#endif
#if !defined(__mips64) && defined(__MIPSEB__)
	unsigned long	__unused2;
#endif
	__kernel_time_t msg_rtime;	/* last msgrcv time */
#if !defined(__mips64) && defined(__MIPSEL__)
	unsigned long	__unused2;
#endif
#if !defined(__mips64) && defined(__MIPSEB__)
	unsigned long	__unused3;
#endif
	__kernel_time_t msg_ctime;	/* last change time */
#if !defined(__mips64) && defined(__MIPSEL__)
	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_MSGBUF_H */
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