| /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| #ifndef __ASM_GENERIC_SEMBUF_H |
| #define __ASM_GENERIC_SEMBUF_H |
| |
| #include <asm/bitsperlong.h> |
| #include <asm/ipcbuf.h> |
| |
| /* |
| * The semid64_ds structure for x86 architecture. |
| * Note extra padding because this structure is passed back and forth |
| * between kernel and user space. |
| * |
| * semid64_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 padding is in the wrong place for |
| * historic reasons, so user space has to reconstruct a time_t |
| * value using |
| * |
| * user_semid_ds.sem_otime = kernel_semid64_ds.sem_otime + |
| * ((long long)kernel_semid64_ds.sem_otime_high << 32) |
| * |
| * Pad space is left for 2 miscellaneous 32-bit values |
| */ |
| struct semid64_ds { |
| struct ipc64_perm sem_perm; /* permissions .. see ipc.h */ |
| #if __BITS_PER_LONG == 64 |
| long sem_otime; /* last semop time */ |
| long sem_ctime; /* last change time */ |
| #else |
| unsigned long sem_otime; /* last semop time */ |
| unsigned long sem_otime_high; |
| unsigned long sem_ctime; /* last change time */ |
| unsigned long sem_ctime_high; |
| #endif |
| unsigned long sem_nsems; /* no. of semaphores in array */ |
| unsigned long __unused3; |
| unsigned long __unused4; |
| }; |
| |
| #endif /* __ASM_GENERIC_SEMBUF_H */ |
