1*f80ad8b4SAndroid Build Coastguard Worker /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*f80ad8b4SAndroid Build Coastguard Worker #ifndef __ASM_GENERIC_SHMBUF_H 3*f80ad8b4SAndroid Build Coastguard Worker #define __ASM_GENERIC_SHMBUF_H 4*f80ad8b4SAndroid Build Coastguard Worker 5*f80ad8b4SAndroid Build Coastguard Worker #include <asm/bitsperlong.h> 6*f80ad8b4SAndroid Build Coastguard Worker #include <asm/ipcbuf.h> 7*f80ad8b4SAndroid Build Coastguard Worker #include <asm/posix_types.h> 8*f80ad8b4SAndroid Build Coastguard Worker 9*f80ad8b4SAndroid Build Coastguard Worker /* 10*f80ad8b4SAndroid Build Coastguard Worker * The shmid64_ds structure for x86 architecture. 11*f80ad8b4SAndroid Build Coastguard Worker * Note extra padding because this structure is passed back and forth 12*f80ad8b4SAndroid Build Coastguard Worker * between kernel and user space. 13*f80ad8b4SAndroid Build Coastguard Worker * 14*f80ad8b4SAndroid Build Coastguard Worker * shmid64_ds was originally meant to be architecture specific, but 15*f80ad8b4SAndroid Build Coastguard Worker * everyone just ended up making identical copies without specific 16*f80ad8b4SAndroid Build Coastguard Worker * optimizations, so we may just as well all use the same one. 17*f80ad8b4SAndroid Build Coastguard Worker * 18*f80ad8b4SAndroid Build Coastguard Worker * 64 bit architectures use a 64-bit long time field here, while 19*f80ad8b4SAndroid Build Coastguard Worker * 32 bit architectures have a pair of unsigned long values. 20*f80ad8b4SAndroid Build Coastguard Worker * On big-endian systems, the lower half is in the wrong place. 21*f80ad8b4SAndroid Build Coastguard Worker * 22*f80ad8b4SAndroid Build Coastguard Worker * 23*f80ad8b4SAndroid Build Coastguard Worker * Pad space is left for: 24*f80ad8b4SAndroid Build Coastguard Worker * - 2 miscellaneous 32-bit values 25*f80ad8b4SAndroid Build Coastguard Worker */ 26*f80ad8b4SAndroid Build Coastguard Worker 27*f80ad8b4SAndroid Build Coastguard Worker struct shmid64_ds { 28*f80ad8b4SAndroid Build Coastguard Worker struct ipc64_perm shm_perm; /* operation perms */ 29*f80ad8b4SAndroid Build Coastguard Worker __kernel_size_t shm_segsz; /* size of segment (bytes) */ 30*f80ad8b4SAndroid Build Coastguard Worker #if __BITS_PER_LONG == 64 31*f80ad8b4SAndroid Build Coastguard Worker long shm_atime; /* last attach time */ 32*f80ad8b4SAndroid Build Coastguard Worker long shm_dtime; /* last detach time */ 33*f80ad8b4SAndroid Build Coastguard Worker long shm_ctime; /* last change time */ 34*f80ad8b4SAndroid Build Coastguard Worker #else 35*f80ad8b4SAndroid Build Coastguard Worker unsigned long shm_atime; /* last attach time */ 36*f80ad8b4SAndroid Build Coastguard Worker unsigned long shm_atime_high; 37*f80ad8b4SAndroid Build Coastguard Worker unsigned long shm_dtime; /* last detach time */ 38*f80ad8b4SAndroid Build Coastguard Worker unsigned long shm_dtime_high; 39*f80ad8b4SAndroid Build Coastguard Worker unsigned long shm_ctime; /* last change time */ 40*f80ad8b4SAndroid Build Coastguard Worker unsigned long shm_ctime_high; 41*f80ad8b4SAndroid Build Coastguard Worker #endif 42*f80ad8b4SAndroid Build Coastguard Worker __kernel_pid_t shm_cpid; /* pid of creator */ 43*f80ad8b4SAndroid Build Coastguard Worker __kernel_pid_t shm_lpid; /* pid of last operator */ 44*f80ad8b4SAndroid Build Coastguard Worker unsigned long shm_nattch; /* no. of current attaches */ 45*f80ad8b4SAndroid Build Coastguard Worker unsigned long __unused4; 46*f80ad8b4SAndroid Build Coastguard Worker unsigned long __unused5; 47*f80ad8b4SAndroid Build Coastguard Worker }; 48*f80ad8b4SAndroid Build Coastguard Worker 49*f80ad8b4SAndroid Build Coastguard Worker struct shminfo64 { 50*f80ad8b4SAndroid Build Coastguard Worker unsigned long shmmax; 51*f80ad8b4SAndroid Build Coastguard Worker unsigned long shmmin; 52*f80ad8b4SAndroid Build Coastguard Worker unsigned long shmmni; 53*f80ad8b4SAndroid Build Coastguard Worker unsigned long shmseg; 54*f80ad8b4SAndroid Build Coastguard Worker unsigned long shmall; 55*f80ad8b4SAndroid Build Coastguard Worker unsigned long __unused1; 56*f80ad8b4SAndroid Build Coastguard Worker unsigned long __unused2; 57*f80ad8b4SAndroid Build Coastguard Worker unsigned long __unused3; 58*f80ad8b4SAndroid Build Coastguard Worker unsigned long __unused4; 59*f80ad8b4SAndroid Build Coastguard Worker }; 60*f80ad8b4SAndroid Build Coastguard Worker 61*f80ad8b4SAndroid Build Coastguard Worker #endif /* __ASM_GENERIC_SHMBUF_H */ 62