1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*4882a593Smuzhiyun #ifndef __ASM_GENERIC_SHMBUF_H 3*4882a593Smuzhiyun #define __ASM_GENERIC_SHMBUF_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <asm/bitsperlong.h> 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun /* 8*4882a593Smuzhiyun * The shmid64_ds structure for x86 architecture. 9*4882a593Smuzhiyun * Note extra padding because this structure is passed back and forth 10*4882a593Smuzhiyun * between kernel and user space. 11*4882a593Smuzhiyun * 12*4882a593Smuzhiyun * shmid64_ds was originally meant to be architecture specific, but 13*4882a593Smuzhiyun * everyone just ended up making identical copies without specific 14*4882a593Smuzhiyun * optimizations, so we may just as well all use the same one. 15*4882a593Smuzhiyun * 16*4882a593Smuzhiyun * 64 bit architectures use a 64-bit long time field here, while 17*4882a593Smuzhiyun * 32 bit architectures have a pair of unsigned long values. 18*4882a593Smuzhiyun * On big-endian systems, the lower half is in the wrong place. 19*4882a593Smuzhiyun * 20*4882a593Smuzhiyun * 21*4882a593Smuzhiyun * Pad space is left for: 22*4882a593Smuzhiyun * - 2 miscellaneous 32-bit values 23*4882a593Smuzhiyun */ 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun struct shmid64_ds { 26*4882a593Smuzhiyun struct ipc64_perm shm_perm; /* operation perms */ 27*4882a593Smuzhiyun size_t shm_segsz; /* size of segment (bytes) */ 28*4882a593Smuzhiyun #if __BITS_PER_LONG == 64 29*4882a593Smuzhiyun long shm_atime; /* last attach time */ 30*4882a593Smuzhiyun long shm_dtime; /* last detach time */ 31*4882a593Smuzhiyun long shm_ctime; /* last change time */ 32*4882a593Smuzhiyun #else 33*4882a593Smuzhiyun unsigned long shm_atime; /* last attach time */ 34*4882a593Smuzhiyun unsigned long shm_atime_high; 35*4882a593Smuzhiyun unsigned long shm_dtime; /* last detach time */ 36*4882a593Smuzhiyun unsigned long shm_dtime_high; 37*4882a593Smuzhiyun unsigned long shm_ctime; /* last change time */ 38*4882a593Smuzhiyun unsigned long shm_ctime_high; 39*4882a593Smuzhiyun #endif 40*4882a593Smuzhiyun __kernel_pid_t shm_cpid; /* pid of creator */ 41*4882a593Smuzhiyun __kernel_pid_t shm_lpid; /* pid of last operator */ 42*4882a593Smuzhiyun unsigned long shm_nattch; /* no. of current attaches */ 43*4882a593Smuzhiyun unsigned long __unused4; 44*4882a593Smuzhiyun unsigned long __unused5; 45*4882a593Smuzhiyun }; 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun struct shminfo64 { 48*4882a593Smuzhiyun unsigned long shmmax; 49*4882a593Smuzhiyun unsigned long shmmin; 50*4882a593Smuzhiyun unsigned long shmmni; 51*4882a593Smuzhiyun unsigned long shmseg; 52*4882a593Smuzhiyun unsigned long shmall; 53*4882a593Smuzhiyun unsigned long __unused1; 54*4882a593Smuzhiyun unsigned long __unused2; 55*4882a593Smuzhiyun unsigned long __unused3; 56*4882a593Smuzhiyun unsigned long __unused4; 57*4882a593Smuzhiyun }; 58*4882a593Smuzhiyun 59*4882a593Smuzhiyun #endif /* __ASM_GENERIC_SHMBUF_H */ 60