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Diffstat (limited to 'winsup/cygwin/include/cygwin/shm.h')
| -rw-r--r-- | winsup/cygwin/include/cygwin/shm.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/winsup/cygwin/include/cygwin/shm.h b/winsup/cygwin/include/cygwin/shm.h new file mode 100644 index 000000000..b6b2d447c --- /dev/null +++ b/winsup/cygwin/include/cygwin/shm.h @@ -0,0 +1,94 @@ +/* sys/shm.h + + Copyright 2001, 2002 Red Hat Inc. + Written by Robert Collins <rbtcollins@hotmail.com> + +This file is part of Cygwin. + +This software is a copyrighted work licensed under the terms of the +Cygwin license. Please consult the file "CYGWIN_LICENSE" for +details. */ + +#ifndef _SYS_SHM_H +#define _SYS_SHM_H + +#include <cygwin/ipc.h> + +#ifdef __cplusplus +extern "C" +{ +#endif + +/* 64 Kb was hardcoded for x86. MS states this may change, but we need + * it in the header file. + */ +#define SHMLBA 65536 /* Segment low boundary address multiple. */ + +/* Shared memory operation flags: + */ +#define SHM_RDONLY 0x01 /* Attach read-only (else read-write). */ +#define SHM_RND 0x02 /* Round attach address to SHMLBA. */ + +/* Command definitions for the semctl () function: + */ +#define SHM_STAT 0x4000 /* For ipcs(8) */ +#define SHM_INFO 0x4001 /* For ipcs(8) */ + +/* Unsigned integer used for the number of current attaches. + */ +typedef unsigned int shmatt_t; + +struct shmid_ds +{ + struct ipc_perm shm_perm; /* Operation permission structure. */ + size_t shm_segsz; /* Size of segment in bytes. */ + pid_t shm_lpid; /* Process ID of last operation. */ + pid_t shm_cpid; /* Process ID of creator. */ + shmatt_t shm_nattch; /* Number of current attaches. */ + timestruc_t shm_atim; /* Time of last shmat (). */ + timestruc_t shm_dtim; /* Time of last shmdt (). */ + timestruc_t shm_ctim; /* Time of last change by shmctl (). */ + long shm_spare4[2]; +}; + +#define shm_atime shm_atim.tv_sec +#define shm_dtime shm_dtim.tv_sec +#define shm_ctime shm_ctim.tv_sec + +/* Buffer type for shmctl (IPC_INFO, ...) as used by ipcs(8). + */ +struct shminfo +{ + unsigned long shmmax; /* Maximum size in bytes of a shared + memory segment. */ + unsigned long shmmin; /* Minimum size in bytes of a shared + memory segment. */ + unsigned long shmmni; /* Maximum number of shared memory + segments, system wide. */ + unsigned long shmseg; /* Maximum number of shared memory + segments attached per process. */ + unsigned long shmall; /* Maximum number of bytes of shared + memory, system wide. */ + unsigned long shm_spare[4]; +}; + +/* Buffer type for shmctl (SHM_INFO, ...) as used by ipcs(8). + */ +struct shm_info +{ + unsigned long shm_ids; /* Number of allocated segments. */ + unsigned long shm_tot; /* Size in bytes of allocated segments. */ + unsigned long shm_atts; /* Number of attached segments, system + wide. */ +}; + +void *shmat (int shmid, const void *shmaddr, int shmflg); +int shmctl (int shmid, int cmd, struct shmid_ds *buf); +int shmdt (const void *shmaddr); +int shmget (key_t key, size_t size, int shmflg); + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_SHM_H */ |