unxi下共享内存的使用

				/* atm.h - general ATM declarations */				 				/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */				 								/*				 * WARNING: User-space programs should not #include  directly.				 *          Instead, #include 				 */								#ifndef _LINUX_ATM_H				#define _LINUX_ATM_H								/*				 * BEGIN_xx and END_xx markers are used for automatic generation of				 * documentation. Do not change them.				 */								#ifdef __KERNEL__				#include 				#include 				#endif				#include 				#include 				#include 												/* general ATM constants */				#define ATM_CELL_SIZE		    53	/* ATM cell size incl. header */				#define ATM_CELL_PAYLOAD	    48	/* ATM payload size */				#define ATM_AAL0_SDU		    52	/* AAL0 SDU size */				#define ATM_MAX_AAL34_PDU	 65535	/* maximum AAL3/4 PDU payload */				#define ATM_AAL5_TRAILER	     8	/* AAL5 trailer size */				#define ATM_MAX_AAL5_PDU	 65535	/* maximum AAL5 PDU payload */				#define ATM_MAX_CDV		  9999	/* maximum (default) CDV */				#define ATM_NOT_RSV_VCI		    32	/* first non-reserved VCI value */								#define ATM_MAX_VPI		   255	/* maximum VPI at the UNI */				#define ATM_MAX_VPI_NNI		  4096	/* maximum VPI at the NNI */				#define ATM_MAX_VCI		 65535	/* maximum VCI */												/* "protcol" values for the socket system call */				#define ATM_NO_AAL	0		/* AAL not specified */				#define ATM_AAL0	13		/* "raw" ATM cells */				#define ATM_AAL1	1		/* AAL1 (CBR) */				#define ATM_AAL2	2		/* AAL2 (VBR) */				#define ATM_AAL34	3		/* AAL3/4 (data) */				#define ATM_AAL5	5		/* AAL5 (data) */								/*				 * socket option name coding functions				 *				 * Note that __SO_ENCODE and __SO_LEVEL are somewhat a hack since the				 * 				 * SOL_SOCKET is 0xFFFF, so that's a bit of a problem				 */								#define __SO_ENCODE(l,n,t)	((((l) & 0x1FF) 								sizeof(t))				#define __SO_LEVEL_MATCH(c,m)	(((c) >> 22) == ((m) & 0x1FF))				#define __SO_NUMBER(c)		(((c) >> 16) & 0x3f)				#define __SO_SIZE(c)		((c) & 0x3fff)								/*				 * ATM layer				 */								#define SO_SETCLP	__SO_ENCODE(SOL_ATM,0,int)							    /* set CLP bit value - TODO */				#define SO_CIRANGE	__SO_ENCODE(SOL_ATM,1,struct atm_cirange)							    /* connection identifier range; socket must be							       bound or connected */				#define SO_ATMQOS	__SO_ENCODE(SOL_ATM,2,struct atm_qos)							    /* Quality of Service setting */				#define SO_ATMSAP	__SO_ENCODE(SOL_ATM,3,struct atm_sap)							    /* Service Access Point */				#define SO_ATMPVC	__SO_ENCODE(SOL_ATM,4,struct sockaddr_atmpvc)							    /* "PVC" address (also for SVCs); get only */								/*				 * Note @@@: since the socket layers don't really distinguish the control and				 * the data plane but generally seems to be data plane-centric, any layer is				 * about equally wrong for the SAP. If you have a better idea about this,				 * please speak up ...				 */												/* ATM cell header (for AAL0) */								/* BEGIN_CH */				#define ATM_HDR_GFC_MASK	0xf0000000				#define ATM_HDR_GFC_SHIFT	28				#define ATM_HDR_VPI_MASK	0x0ff00000				#define ATM_HDR_VPI_SHIFT	20				#define ATM_HDR_VCI_MASK	0x000ffff0				#define ATM_HDR_VCI_SHIFT	4				#define ATM_HDR_PTI_MASK	0x0000000e				#define ATM_HDR_PTI_SHIFT	1				#define ATM_HDR_CLP		0x00000001				/* END_CH */												/* PTI codings */								/* BEGIN_PTI */				#define ATM_PTI_US0	0  /* user data cell, congestion not exp, SDU-type 0 */				#define ATM_PTI_US1	1  /* user data cell, congestion not exp, SDU-type 1 */				#define ATM_PTI_UCES0	2  /* user data cell, cong. experienced, SDU-type 0 */				#define ATM_PTI_UCES1	3  /* user data cell, cong. experienced, SDU-type 1 */				#define ATM_PTI_SEGF5	4  /* segment OAM F5 flow related cell */				#define ATM_PTI_E2EF5	5  /* end-to-end OAM F5 flow related cell */				#define ATM_PTI_RSV_RM	6  /* reserved for traffic control/resource mgmt */				#define ATM_PTI_RSV	7  /* reserved */				/* END_PTI */												/*				 * The following items should stay in linux/atm.h, which should be linked to				 * netatm/atm.h				 */								/* Traffic description */								#define ATM_NONE	0		/* no traffic */				#define ATM_UBR		1				#define ATM_CBR		2				#define ATM_VBR		3				#define ATM_ABR		4				#define ATM_ANYCLASS	5		/* compatible with everything */								#define ATM_MAX_PCR	-1		/* maximum available PCR */								struct atm_trafprm {					unsigned char	traffic_class;	/* traffic class (ATM_UBR, ...) */					int		max_pcr;	/* maximum PCR in cells per second */					int		pcr;		/* desired PCR in cells per second */					int		min_pcr;	/* minimum PCR in cells per second */					int		max_cdv;	/* maximum CDV in microseconds */					int		max_sdu;	/* maximum SDU in bytes */				        /* extra params for ABR */				        unsigned int 	icr;         	/* Initial Cell Rate (24-bit) */				        unsigned int	tbe;		/* Transient Buffer Exposure (24-bit) */ 				        unsigned int 	frtt : 24;	/* Fixed Round Trip Time (24-bit) */				        unsigned int 	rif  : 4;       /* Rate Increment Factor (4-bit) */				        unsigned int 	rdf  : 4;       /* Rate Decrease Factor (4-bit) */				        unsigned int nrm_pres  :1;      /* nrm present bit */				        unsigned int trm_pres  :1;     	/* rm present bit */				        unsigned int adtf_pres :1;     	/* adtf present bit */				        unsigned int cdf_pres  :1;    	/* cdf present bit*/				        unsigned int nrm       :3;     	/* Max # of Cells for each forward RM cell (3-bit) */				        unsigned int trm       :3;    	/* Time between forward RM cells (3-bit) */    					unsigned int adtf      :10;     /* ACR Decrease Time Factor (10-bit) */					unsigned int cdf       :3;      /* Cutoff Decrease Factor (3-bit) */				        unsigned int spare     :9;      /* spare bits */ 				};								struct atm_qos {					struct atm_trafprm txtp;	/* parameters in TX direction */					struct atm_trafprm rxtp __ATM_API_ALIGN;									/* parameters in RX direction */					unsigned char aal __ATM_API_ALIGN;				};								/* PVC addressing */								#define ATM_ITF_ANY	-1		/* "magic" PVC address values */				#define ATM_VPI_ANY	-1				#define ATM_VCI_ANY	-1				#define ATM_VPI_UNSPEC	-2				#define ATM_VCI_UNSPEC	-2												struct sockaddr_atmpvc {					unsigned short 	sap_family;	/* address family, AF_ATMPVC  */					struct {			/* PVC address */						short	itf;		/* ATM interface */						short	vpi;		/* VPI (only 8 bits at UNI) */						int	vci;		/* VCI (only 16 bits at UNI) */					} sap_addr __ATM_API_ALIGN;	/* PVC address */				};								/* SVC addressing */								#define	ATM_ESA_LEN	20		/* ATM End System Address length */				#define ATM_E164_LEN	12		/* maximum E.164 number length */								#define ATM_AFI_DCC	0x39		/* DCC ATM Format */				#define ATM_AFI_ICD	0x47		/* ICD ATM Format */				#define ATM_AFI_E164	0x45		/* E.164 ATM Format */				#define ATM_AFI_LOCAL	0x49		/* Local ATM Format */ 								#define ATM_AFI_DCC_GROUP	0xBD	/* DCC ATM Group Format */				#define ATM_AFI_ICD_GROUP	0xC5	/* ICD ATM Group Format */				#define ATM_AFI_E164_GROUP	0xC3	/* E.164 ATM Group Format */				#define ATM_AFI_LOCAL_GROUP	0xC7	/* Local ATM Group Format */								#define ATM_LIJ_NONE	0		/* no leaf-initiated join */				#define ATM_LIJ		1		/* request joining */				#define ATM_LIJ_RPJ	2		/* set to root-prompted join */				#define ATM_LIJ_NJ	3		/* set to network join */												struct sockaddr_atmsvc {				    unsigned short 	sas_family;	/* address family, AF_ATMSVC */				    struct {				/* SVC address */				        unsigned char	prv[ATM_ESA_LEN];/* private ATM address */				        char		pub[ATM_E164_LEN+1]; /* public address (E.164) */				    					/* unused addresses must be bzero'ed */					char		lij_type;	/* role in LIJ call; one of ATM_LIJ* */					uint32_t	lij_id;		/* LIJ call identifier */				    } sas_addr __ATM_API_ALIGN;		/* SVC address */				};												static __inline__ int atmsvc_addr_in_use(struct sockaddr_atmsvc addr)				{					return *addr.sas_addr.prv || *addr.sas_addr.pub;				}												static __inline__ int atmpvc_addr_in_use(struct sockaddr_atmpvc addr)				{					return addr.sap_addr.itf || addr.sap_addr.vpi || addr.sap_addr.vci;				}												/*				 * Some stuff for linux/sockios.h				 */								struct atmif_sioc {				    int number;				    int length;				    void *arg;				};								typedef unsigned short atm_backend_t;								#ifdef __KERNEL__								#include 	/* struct net_proto */												void atmpvc_proto_init(struct net_proto *pro);				void atmsvc_proto_init(struct net_proto *pro);								#endif /* __KERNEL__ */								#endif