SYNOPSIS

#include <ixp.h>
typedef struct IxpFcall IxpFcall;
typedef union IxpFcall IxpFcall;
union IxpFcall {
IxpFHdr hdr;
IxpFVersion version;
IxpFVersion tversion;
IxpFVersion rversion;
IxpFTFlush tflush;
IxpFROpen ropen;
IxpFROpen rcreate;
IxpFROpen rattach;
IxpFError error;
IxpFRAuth rauth;
IxpFAttach tattach;
IxpFAttach tauth;
IxpFTCreate tcreate;
IxpFTCreate topen;
IxpFTWalk twalk;
IxpFRWalk rwalk;
IxpFTWStat twstat;
IxpFRStat rstat;
IxpFIO twrite;
IxpFIO rwrite;
IxpFIO tread;
IxpFIO rread;
IxpFIO io;
}
enum IxpFType {
P9_TVersion = 100,
P9_RVersion,
P9_TAuth = 102,
P9_RAuth,
P9_TAttach = 104,
P9_RAttach,
P9_TError = 106, /* illegal */
P9_RError,
P9_TFlush = 108,
P9_RFlush,
P9_TWalk = 110,
P9_RWalk,
P9_TOpen = 112,
P9_ROpen,
P9_TCreate = 114,
P9_RCreate,
P9_TRead = 116,
P9_RRead,
P9_TWrite = 118,
P9_RWrite,
P9_TClunk = 120,
P9_RClunk,
P9_TRemove = 122,
P9_RRemove,
P9_TStat = 124,
P9_RStat,
P9_TWStat = 126,
P9_RWStat,
}
typedef struct IxpFAttach IxpFAttach;
struct IxpFAttach {
IxpFHdr hdr;
uint32_t afid;
char* uname;
char* aname;
}
typedef struct IxpFError IxpFError;
struct IxpFError {
IxpFHdr hdr;
char* ename;
}
typedef struct IxpFHdr IxpFHdr;
struct IxpFHdr {
uint8_t type;
uint16_t tag;
uint32_t fid;
}
typedef struct IxpFIO IxpFIO;
struct IxpFIO {
IxpFHdr hdr;
uint64_t offset; /* Tread, Twrite */
uint32_t count; /* Tread, Twrite, Rread */
char* data; /* Twrite, Rread */
}
typedef struct IxpFRAuth IxpFRAuth;
struct IxpFRAuth {
IxpFHdr hdr;
IxpQid aqid;
}
typedef struct IxpFROpen IxpFROpen;
struct IxpFROpen {
IxpFHdr hdr;
IxpQid qid; /* +Rattach */
uint32_t iounit;
}
typedef struct IxpFRStat IxpFRStat;
struct IxpFRStat {
IxpFHdr hdr;
uint16_t nstat;
uint8_t* stat;
}
typedef struct IxpFRWalk IxpFRWalk;
struct IxpFRWalk {
IxpFHdr hdr;
uint16_t nwqid;
IxpQid wqid[IXP_MAX_WELEM];
}
typedef struct IxpFTCreate IxpFTCreate;
struct IxpFTCreate {
IxpFHdr hdr;
uint32_t perm;
char* name;
uint8_t mode; /* +Topen */
}
typedef struct IxpFTFlush IxpFTFlush;
struct IxpFTFlush {
IxpFHdr hdr;
uint16_t oldtag;
}
typedef struct IxpFTWStat IxpFTWStat;
struct IxpFTWStat {
IxpFHdr hdr;
IxpStat stat;
}
typedef struct IxpFTWalk IxpFTWalk;
struct IxpFTWalk {
IxpFHdr hdr;
uint32_t newfid;
uint16_t nwname;
char* wname[IXP_MAX_WELEM];
}
typedef struct IxpFVersion IxpFVersion;
struct IxpFVersion {
IxpFHdr hdr;
uint32_t msize;
char* version;
}

DESCRIPTION

The IxpFcall structure represents a 9P protocol message. The hdr element is common to all Fcall types, and may be used to determine the type and tag of the message. The IxpFcall type is used heavily in server applications, where it both presents a request to handler functions and returns a response to the client.

Each member of the IxpFcall structure represents a certain message type, which can be discerned from the hdr.type field. This value corresponds to one of the IxpFType constants. Types with significant overlap use the same structures, thus TRead and RWrite are both represented by IxpFIO and can be accessed via the io member as well as tread and rwrite respectively.