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msgbuf.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef __ASM_GENERIC_MSGBUF_H #define __ASM_GENERIC_MSGBUF_H #include <asm/bitsperlong.h> #include <asm/ipcbuf.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 use a 64-bit long time field here, while * 32 bit architectures have a pair of unsigned long values. * On big-endian systems, the lower half is in the wrong place. * * Pad space is left for: * - 2 miscellaneous 32-bit values */ struct msqid64_ds { struct ipc64_perm msg_perm; #if __BITS_PER_LONG == 64 long msg_stime; /* last msgsnd time */ long msg_rtime; /* last msgrcv time */ long msg_ctime; /* last change time */ #else unsigned long msg_stime; /* last msgsnd time */ unsigned long msg_stime_high; unsigned long msg_rtime; /* last msgrcv time */ unsigned long msg_rtime_high; unsigned long msg_ctime; /* last change time */ unsigned long msg_ctime_high; #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 */
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