ref: d24ba6187aebabe39813ded5227516637b708626
dir: c9/c9.h
struct C9aux;
typedef struct C9r C9r;
typedef struct C9t C9t;
typedef struct C9stat C9stat;
typedef struct C9ctx C9ctx;
typedef struct C9qid C9qid;
typedef uint32_t C9fid;
typedef uint16_t C9tag;
/* Stat field is not changed if it's set to this value when calling c9wstat. */
#define C9nochange (~0)
/* Special fid used with auth/attach to basically avoid authentication. */
#define C9nofid ((C9fid)~0)
/* C9modes for opening a file. */
typedef enum
{
C9read = 0,
C9write = 1,
C9rdwr = 2,
C9exec = 3,
C9trunc = 0x10,
C9rclose = 0x40,
}C9mode;
typedef enum
{
/* User/owner. */
C9permur = 1<<8, /* Readable. */
C9permuw = 1<<7, /* Writable. */
C9permux = 1<<6, /* Executable. */
/* Group. */
C9permgr = 1<<5,
C9permgw = 1<<4,
C9permgx = 1<<3,
/* Other. */
C9permor = 1<<2,
C9permow = 1<<1,
C9permox = 1<<0,
}C9perm;
/* Directory. */
#define C9permdir 0x80000000
/* Bitmask of stat.mode. */
#define C9stdir 0x80000000
#define C9stappend 0x40000000
#define C9stexcl 0x20000000
#define C9sttmp 0x04000000
/* Limits. */
enum
{
C9maxtags = 64, /* Maximal number of outstanding requests. [1-65535] */
C9maxflush = 8, /* Maximal number of outstanding flushes. [1-65535] */
C9maxstr = 0xffff, /* Maximal string length. [1-65535] */
C9minmsize = 4096, /* Minimal sane msize. [4096-...] */
C9maxpathel = 16, /* Maximal number of elements in a path. Do not change. */
};
/* Errors. */
typedef enum
{
C9Einit = -1, /* Initialization failed. */
C9Ever = -2, /* Protocol version doesn't match. */
C9Epkt = -3, /* Incoming packet error. */
C9Etag = -4, /* No free tags or bad tag. */
C9Ebuf = -5, /* No buffer space enough for a message. */
C9Epath = -6, /* Path is too long or just invalid. */
C9Eflush = -7, /* Limit of outstanding flushes reached. */
C9Esize = -8, /* Can't fit data in one message. */
C9Estr = -9 /* Bad string. */
}C9error;
/* Request types. */
typedef enum
{
Tversion = 100,
Tauth = 102,
Tattach = 104,
Tflush = 108,
Twalk = 110,
Topen = 112,
Tcreate = 114,
Tread = 116,
Twrite = 118,
Tclunk = 120,
Tremove = 122,
Tstat = 124,
Twstat = 126
}C9ttype;
/* Response types. */
typedef enum
{
Rversion = 101,
Rauth = 103,
Rattach = 105,
Rerror = 107,
Rflush = 109,
Rwalk = 111,
Ropen = 113,
Rcreate = 115,
Rread = 117,
Rwrite = 119,
Rclunk = 121,
Rremove = 123,
Rstat = 125,
Rwstat = 127
}C9rtype;
/* Unique file id type. */
typedef enum
{
C9qtdir = 1<<7,
C9qtappend = 1<<6,
C9qtexcl = 1<<5,
C9qtauth = 1<<3,
C9qttmp = 1<<2,
C9qtfile = 0
}C9qt;
/* Unique file id. */
struct C9qid
{
uint64_t path;
uint32_t version;
C9qt type;
};
/*
* File stats. Version and muid are ignored on wstat. Dmdir bit
* change in mode won't work on wstat. Set any integer field to
* C9nochange to keep it unchanged on wstat. Set any string to NULL to
* keep it unchanged. Strings can be empty (""), but never NULL after
* stat call.
*/
struct C9stat
{
uint64_t size; /* Size of the file (in bytes). */
char *name; /* Name of the file. */
char *uid; /* Owner of the file. */
char *gid; /* Group of the file. */
char *muid; /* The user who modified the file last. */
C9qid qid; /* Same as qid[0]. */
uint32_t mode; /* Permissions. See C9st* and C9perm. */
uint32_t atime; /* Last access time. */
uint32_t mtime; /* Last modification time. */
};
/* Response data. */
struct C9r
{
union
{
char *error;
struct
{
uint8_t *data;
uint32_t size;
}read;
struct
{
uint32_t size;
}write;
/* File stats (only valid if type is Rstat). */
C9stat stat;
/*
* Qid(s). qid[0] is valid for auth/attach/create/stat/open.
* More ids may be a result of a walk, see numqid.
*/
C9qid qid[C9maxpathel];
};
C9rtype type; /* Response type. */
/*
* If not zero, is the maximum number of bytes that are guaranteed
* to be read or written atomically, without breaking into multiple
* messages.
*/
uint32_t iounit;
int numqid; /* Number of valid unique ids in qid array. */
C9tag tag; /* Tag number. */
};
/* Request data. */
struct C9t
{
C9ttype type;
C9tag tag;
union
{
struct
{
char *uname;
char *aname;
C9fid afid;
}attach;
struct
{
char *uname;
char *aname;
C9fid afid;
}auth;
struct
{
char *name;
uint32_t perm;
C9mode mode;
}create;
struct
{
C9tag oldtag;
}flush;
struct
{
C9mode mode;
}open;
struct
{
uint64_t offset;
uint32_t size;
}read;
struct
{
char *wname[C9maxpathel+1]; /* wname[16] is always NULL */
C9fid newfid;
}walk;
struct
{
uint64_t offset;
uint8_t *data;
uint32_t size;
}write;
C9stat wstat;
};
C9fid fid;
};
enum
{
C9tagsbits = sizeof(uint32_t) * 8,
};
struct C9ctx
{
/*
* Should return a pointer to the data (exactly 'size' bytes) read.
* Set 'err' to non-zero and return NULL in case of error.
* 'err' set to zero (no error) should be used to return from c9process
* early (timeout on read to do non-blocking operations, for example).
*/
uint8_t *(*read)(C9ctx *ctx, uint32_t size, int *err) __attribute__((nonnull(1, 3)));
/* Should return a buffer to store 'size' bytes. Nil means no memory. */
uint8_t *(*begin)(C9ctx *ctx, uint32_t size) __attribute__((nonnull(1)));
/*
* Marks the end of a message. Callback may decide if any accumulated
* messages should be sent to the server/client.
*/
int (*end)(C9ctx *ctx) __attribute__((nonnull(1)));
/* Callback called every time a new R-message is received. */
void (*r)(C9ctx *ctx, C9r *r) __attribute__((nonnull(1, 2)));
/* Callback called every time a new T-message is received. */
void (*t)(C9ctx *ctx, C9t *t) __attribute__((nonnull(1, 2)));
/* Callback for error messages. */
void (*error)(const char *fmt, ...) __attribute__((nonnull(1), format(printf, 1, 2)));
/* Auxiliary data, can be used by any of above callbacks. */
struct C9aux *aux;
/* private stuff */
uint32_t msize;
#ifndef C9_NO_CLIENT
uint32_t flush[C9maxflush];
uint32_t tags[C9maxtags/C9tagsbits];
#endif
union
{
C9tag lowfreetag;
uint16_t svflags;
};
};
/* Parse one directory entry. */
extern C9error c9parsedir(C9ctx *c, C9stat *stat, uint8_t **data, uint32_t *size) __attribute__((nonnull(1, 2, 3)));
#ifndef C9_NO_CLIENT
extern C9error c9version(C9ctx *c, C9tag *tag, uint32_t msize) __attribute__((nonnull(1, 2)));
extern C9error c9auth(C9ctx *c, C9tag *tag, C9fid afid, const char *uname, const char *aname) __attribute__((nonnull(1, 2)));
extern C9error c9flush(C9ctx *c, C9tag *tag, C9tag oldtag) __attribute__((nonnull(1, 2)));
extern C9error c9attach(C9ctx *c, C9tag *tag, C9fid fid, C9fid afid, const char *uname, const char *aname) __attribute__((nonnull(1, 2)));
extern C9error c9walk(C9ctx *c, C9tag *tag, C9fid fid, C9fid newfid, const char *path[]) __attribute__((nonnull(1, 2, 5)));
extern C9error c9open(C9ctx *c, C9tag *tag, C9fid fid, C9mode mode) __attribute__((nonnull(1, 2)));
extern C9error c9create(C9ctx *c, C9tag *tag, C9fid fid, const char *name, uint32_t perm, C9mode mode) __attribute__((nonnull(1, 2, 4)));
extern C9error c9read(C9ctx *c, C9tag *tag, C9fid fid, uint64_t offset, uint32_t count) __attribute__((nonnull(1, 2)));
extern C9error c9write(C9ctx *c, C9tag *tag, C9fid fid, uint64_t offset, const void *in, uint32_t count) __attribute__((nonnull(1, 2, 5)));
extern C9error c9wrstr(C9ctx *c, C9tag *tag, C9fid fid, const char *s) __attribute__((nonnull(1, 2, 4)));
extern C9error c9clunk(C9ctx *c, C9tag *tag, C9fid fid) __attribute__((nonnull(1, 2)));
extern C9error c9remove(C9ctx *c, C9tag *tag, C9fid fid) __attribute__((nonnull(1, 2)));
extern C9error c9stat(C9ctx *c, C9tag *tag, C9fid fid) __attribute__((nonnull(1, 2)));
extern C9error c9wstat(C9ctx *c, C9tag *tag, C9fid fid, const C9stat *s) __attribute__((nonnull(1, 2, 4)));
/*
* Wait until a response comes and process it. If the function returns
* any error, context must be treated as 'broken' and no subsequent calls
* should be made without reinitialization (c9version).
*/
extern C9error c9proc(C9ctx *c) __attribute__((nonnull(1)));
#endif /* C9_NO_CLIENT */
#ifndef C9_NO_SERVER
extern C9error s9version(C9ctx *c) __attribute__((nonnull(1)));
extern C9error s9auth(C9ctx *c, C9tag tag, const C9qid *aqid) __attribute__((nonnull(1, 3)));
extern C9error s9error(C9ctx *c, C9tag tag, const char *err) __attribute__((nonnull(1)));
extern C9error s9attach(C9ctx *c, C9tag tag, const C9qid *qid) __attribute__((nonnull(1, 3)));
extern C9error s9flush(C9ctx *c, C9tag tag) __attribute__((nonnull(1)));
extern C9error s9walk(C9ctx *c, C9tag tag, C9qid *qids[]) __attribute__((nonnull(1, 3)));
extern C9error s9open(C9ctx *c, C9tag tag, const C9qid *qid, uint32_t iounit) __attribute__((nonnull(1, 3)));
extern C9error s9create(C9ctx *c, C9tag tag, const C9qid *qid, uint32_t iounit) __attribute__((nonnull(1, 3)));
extern C9error s9read(C9ctx *c, C9tag tag, const void *data, uint32_t size) __attribute__((nonnull(1, 3)));
extern C9error s9readdir(C9ctx *c, C9tag tag, C9stat *st[], int *num, uint64_t *offset, uint32_t size) __attribute__((nonnull(1, 3, 4)));
extern C9error s9write(C9ctx *c, C9tag tag, uint32_t size) __attribute__((nonnull(1)));
extern C9error s9clunk(C9ctx *c, C9tag tag) __attribute__((nonnull(1)));
extern C9error s9remove(C9ctx *c, C9tag tag) __attribute__((nonnull(1)));
extern C9error s9stat(C9ctx *c, C9tag tag, const C9stat *s) __attribute__((nonnull(1, 3)));
extern C9error s9wstat(C9ctx *c, C9tag tag) __attribute__((nonnull(1)));
extern C9error s9proc(C9ctx *c) __attribute__((nonnull(1)));
#endif /* C9_NO_SERVER */