/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef __ASM_GENERIC_SHMBUF_H #define __ASM_GENERIC_SHMBUF_H #include <asm/bitsperlong.h> #include <asm/ipcbuf.h> #include <asm/posix_types.h> /* * The shmid64_ds structure for x86 architecture. * Note extra padding because this structure is passed back and forth * between kernel and user space. * * shmid64_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 shmid64_ds { struct ipc64_perm shm_perm; /* operation perms */ __kernel_size_t shm_segsz; /* size of segment (bytes) */ #if __BITS_PER_LONG == 64 long shm_atime; /* last attach time */ long shm_dtime; /* last detach time */ long shm_ctime; /* last change time */ #else unsigned long shm_atime; /* last attach time */ unsigned long shm_atime_high; unsigned long shm_dtime; /* last detach time */ unsigned long shm_dtime_high; unsigned long shm_ctime; /* last change time */ unsigned long shm_ctime_high; #endif __kernel_pid_t shm_cpid; /* pid of creator */ __kernel_pid_t shm_lpid; /* pid of last operator */ unsigned long shm_nattch; /* no. of current attaches */ unsigned long __unused4; unsigned long __unused5; }; struct shminfo64 { unsigned long shmmax; unsigned long shmmin; unsigned long shmmni; unsigned long shmseg; unsigned long shmall; unsigned long __unused1; unsigned long __unused2; unsigned long __unused3; unsigned long __unused4; }; #endif /* __ASM_GENERIC_SHMBUF_H */