| /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| #ifndef __ASM_GENERIC_SHMBUF_H |
| #define __ASM_GENERIC_SHMBUF_H |
| |
| #include <asm/bitsperlong.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 typically define a 64 bit __kernel_time_t, |
| * so they do not need the first two padding words. |
| * On big-endian systems, the padding 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 */ |
| size_t shm_segsz; /* size of segment (bytes) */ |
| #if __BITS_PER_LONG == 64 |
| __kernel_time_t shm_atime; /* last attach time */ |
| __kernel_time_t shm_dtime; /* last detach time */ |
| __kernel_time_t 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 */ |