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45 lines
1.5 KiB
45 lines
1.5 KiB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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#ifndef __ASM_GENERIC_SEMBUF_H |
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#define __ASM_GENERIC_SEMBUF_H |
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#include <asm/bitsperlong.h> |
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#include <asm/ipcbuf.h> |
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/* |
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* The semid64_ds structure for most architectures (though it came from x86_32 |
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* originally). Note extra padding because this structure is passed back and |
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* forth between kernel and user space. |
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* |
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* semid64_ds was originally meant to be architecture specific, but |
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* everyone just ended up making identical copies without specific |
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* optimizations, so we may just as well all use the same one. |
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* |
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* 64 bit architectures use a 64-bit long time field here, while |
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* 32 bit architectures have a pair of unsigned long values. |
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* |
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* On big-endian systems, the padding is in the wrong place for |
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* historic reasons, so user space has to reconstruct a time_t |
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* value using |
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* |
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* user_semid_ds.sem_otime = kernel_semid64_ds.sem_otime + |
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* ((long long)kernel_semid64_ds.sem_otime_high << 32) |
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* |
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* Pad space is left for 2 miscellaneous 32-bit values |
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*/ |
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struct semid64_ds { |
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struct ipc64_perm sem_perm; /* permissions .. see ipc.h */ |
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#if __BITS_PER_LONG == 64 |
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long sem_otime; /* last semop time */ |
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long sem_ctime; /* last change time */ |
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#else |
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unsigned long sem_otime; /* last semop time */ |
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unsigned long sem_otime_high; |
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unsigned long sem_ctime; /* last change time */ |
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unsigned long sem_ctime_high; |
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#endif |
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unsigned long sem_nsems; /* no. of semaphores in array */ |
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unsigned long __unused3; |
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unsigned long __unused4; |
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}; |
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#endif /* __ASM_GENERIC_SEMBUF_H */
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