103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
#ifndef _SYS_SHM_H
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#define _SYS_SHM_H 1
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#include <stdint.h>
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#include <sys/types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* The following System V style IPC functions implement a shared memory
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facility. The definition is found in XPG4.2. */
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/* Mode bits for `msgget', `semget', and `shmget'. */
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#define IPC_CREAT 01000 /* Create key if key does not exist. */
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#define IPC_EXCL 02000 /* Fail if key exists. */
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#define IPC_NOWAIT 04000 /* Return error on wait. */
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/* Control commands for `msgctl', `semctl', and `shmctl'. */
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#define IPC_RMID 0 /* Remove identifier. */
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#define IPC_SET 1 /* Set `ipc_perm' options. */
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#define IPC_STAT 2 /* Get `ipc_perm' options. */
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#define IPC_INFO 3 /* See ipcs. */
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/* Special key values. */
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#define IPC_PRIVATE ((key_t) 0) /* Private key. */
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/* Permission flag for shmget. */
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#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
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#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
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/* Flags for `shmat'. */
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#define SHM_RDONLY 010000 /* attach read-only else read-write */
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#define SHM_RND 020000 /* round attach address to SHMLBA */
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#define SHM_REMAP 040000 /* take-over region on attach */
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#define SHM_EXEC 0100000 /* execution access */
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/* Commands for `shmctl'. */
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#define SHM_LOCK 11 /* lock segment (root only) */
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#define SHM_UNLOCK 12 /* unlock segment (root only) */
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/* Type to count number of attaches. */
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typedef unsigned long int shmatt_t;
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typedef long int __long_time_t; /* to keep compatibility to Debian Wheezy armhf */
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/*
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typedef int32_t __key_t;
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typedef __key_t key_t;
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typedef uint32_t __uid_t;
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typedef uint32_t __gid_t;
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*/
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#ifdef NO_debian_ipc_perm
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/* Data structure used to pass permission information to IPC operations. */
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struct debian_ipc_perm /* We cannot use Android version, because there are no padding fields */
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{
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key_t __key; /* Key. */
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__uid_t uid; /* Owner's user ID. */
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__gid_t gid; /* Owner's group ID. */
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__uid_t cuid; /* Creator's user ID. */
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__gid_t cgid; /* Creator's group ID. */
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unsigned short int mode; /* Read/write permission. */
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unsigned short int __pad1;
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unsigned short int __seq; /* Sequence number. */
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unsigned short int __pad2;
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unsigned long int __unused1;
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unsigned long int __unused2;
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};
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#endif
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/* Data structure describing a shared memory segment. */
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struct shmid_ds
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{
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struct debian_ipc_perm shm_perm; /* operation permission struct */
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size_t shm_segsz; /* size of segment in bytes */
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__long_time_t shm_atime; /* time of last shmat() */
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unsigned long int __unused1;
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__long_time_t shm_dtime; /* time of last shmdt() */
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unsigned long int __unused2;
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__long_time_t shm_ctime; /* time of last change by shmctl() */
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unsigned long int __unused3;
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__pid_t shm_cpid; /* pid of creator */
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__pid_t shm_lpid; /* pid of last shmop */
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shmatt_t shm_nattch; /* number of current attaches */
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unsigned long int __unused4;
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unsigned long int __unused5;
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};
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/* Shared memory control operation. */
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extern int shmctl (int __shmid, int __cmd, struct shmid_ds *__buf);
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/* Get shared memory segment. */
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extern int shmget (key_t __key, size_t __size, int __shmflg);
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/* Attach shared memory segment. */
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extern void *shmat (int __shmid, const void *__shmaddr, int __shmflg);
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/* Detach shared memory segment. */
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extern int shmdt (const void *__shmaddr);
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#ifdef __cplusplus
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}
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#endif
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#endif /* sys/shm.h */
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