more functions

include/9pclient.h

@@ -47,8 +47,15 @@ CFid *fscreate(CFsys*, char*, int, ulong);
 int fsaccess(CFsys*, char*, int);
 int	fsvprint(CFid*, char*, va_list);
 int	fsprint(CFid*, char*, ...);
+Qid	fsqid(CFid*);
+
+/* manipulate unopened fids */
+CFid	*fswalk(CFid*, char*);
+int fsfopen(CFid*, int);
+int fsfcreate(CFid*, char*, int, ulong);
 
 extern int chatty9pclient;
+extern int eofkill9pclient;
 
 #ifdef __cplusplus
 }

man/man3/9pclient.3

@@ -1,6 +1,6 @@
 .TH 9PCLIENT 3
 .SH NAME
-CFid, CFsys, fsinit, fsmount, fsroot, fssetroot, fsunmount, nsinit, nsmount, fsversion, fsauth, fsattach, fsclose, fscreate, fsremove, fsfremove, fsaccess, fsdirread, fsdirreadall, fsdirstat, fsdirfstat, fsdirwstat, fsdirfwstat, fsopen, nsopen, fsopenfd, fspread, fspwrite, fsread, fsreadn, fsseek, fswrite, fsprint, fsvprint \- 9P client library
+CFid, CFsys, fsinit, fsmount, fsroot, fssetroot, fsunmount, nsinit, nsmount, fsversion, fsauth, fsattach, fsclose, fscreate, fsfcreate, fsremove, fsfremove, fsaccess, fsdirread, fsdirreadall, fsdirstat, fsdirfstat, fsdirwstat, fsdirfwstat, fsopen, fsfopen, nsopen, fsopenfd, fspread, fspwrite, fsread, fsreadn, fsseek, fswrite, fsprint, fsvprint \- 9P client library
 .SH SYNOPSIS
 .B #include <u.h>
 .PP
@@ -50,6 +50,9 @@ void	fsclose(CFid *fid)
 CFid*	fscreate(CFsys *fs, char *path, int mode, ulong perm)
 .PP
 .B
+int	fsfcreate(CFid *fid, char *path, int mode, ulong perm)
+.PP
+.B
 int	fsremove(CFSys *fs, char *path)
 .PP
 .B
@@ -62,6 +65,9 @@ int	fsaccess(CFsys *fs, char *path, int amode)
 CFid*	fsopen(CFsys *fs, char *path, int mode)
 .PP
 .B
+int	fsfopen(CFid *fid, char *path, int mode)
+.PP
+.B
 long	fspread(CFid *fid, void *buf, long n, vlong offset)
 .PP
 .B
@@ -86,6 +92,9 @@ int	fsvprint(CFid *fid, char *fmt, ...)
 vlong	fsseek(CFid *Fid, vlong n, int type)
 .PP
 .B
+Qid	fsqid(CFid *fid)
+.PP
+.B
 long	fsdirread(CFid *fid, Dir **d)
 .PP
 .B
@@ -108,6 +117,12 @@ int	fsopenfd(CFsys *fs, char *path, int mode)
 .PP
 .B
 CFsys*	nsopen(char *name, char *aname, char *path, int mode)
+.PP
+.B
+extern int chatty9pclient;
+.PP
+.B
+extern int eofkill9pclient;
 .SH DESCRIPTION
 The
 .I 9pclient
@@ -218,6 +233,9 @@ Fids are not reference counted: when
 .I fsclose
 is called, the clunk transaction and freeing of storage
 happen immediately.
+Despite its name,
+.I fsclose
+can be used to clunk fids that are not open for I/O.
 .PP
 .I Fscreate
 and
@@ -249,7 +267,25 @@ dot
 .RB ( . )
 are ignored.
 .PP
-Once opened, these fids can be read and written using
+Alternately,
+.I fswalk
+walks from a fid to a given name
+to create a new fid.
+The name may be nil, corresponding to a walk with no names.
+Otherwise the name is taken as a slash-separated sequence
+of path elements.
+.I Fsfcreate
+and
+.I fsfopen
+issue 
+.I create
+and
+.I open
+transactions using the passed fid argument,
+which should have been obtained by calling
+.IR fswalk .
+.PP
+Once opened, fids can be read and written using
 .I fspread
 and
 .IR fspwrite ,
@@ -291,6 +327,17 @@ repeatedly to obtain exactly
 .I n
 bytes of data, unless it encounters end-of-file or an error.
 .PP
+.IR Attach ,
+.IR walk ,
+.IR create ,
+and
+.I open
+transactions include in their replies an updated qid for the
+fid being manipulated.
+.I Fsqid
+returns the most recent qid returned by one of these transactions
+for the given fid.
+.PP
 .I Fsaccess
 behaves like Unix's
 .IR access (2).
@@ -386,6 +433,18 @@ opens a single file on a name space server: it runs
 .IR fsopen ,
 and then
 .IR fsunmount .
+.PP
+If the
+.B chatty9pclient
+flag is set, the library prints all 9P messages
+to standard error.
+If the
+.B eofkill9pclient
+flag is set, the library calls
+.I threadexitsall
+(see
+.IR thread (3))
+when it detects EOF on a 9P connection.
 .SH SOURCE
 .B \*9/src/lib9pclient
 .SH SEE ALSO

src/lib9pclient/create.c

@@ -4,11 +4,26 @@
 #include <9pclient.h>
 #include "fsimpl.h"
 
+int
+fsfcreate(CFid *fid, char *name, int mode, ulong perm)
+{
+	Fcall tx, rx;
+
+	tx.type = Tcreate;
+	tx.name = name;
+	tx.fid = fid->fid;
+	tx.mode = mode;
+	tx.perm = perm;
+	if(_fsrpc(fid->fs, &tx, &rx, 0) < 0)
+		return -1;
+	fid->mode = mode;
+	return 0;
+}
+
 CFid*
 fscreate(CFsys *fs, char *name, int mode, ulong perm)
 {
 	CFid *fid;
-	Fcall tx, rx;
 	char *p, *dir, *elem;
 	
 	p = strrchr(name, '/');
@@ -21,24 +36,16 @@ fscreate(CFsys *fs, char *name, int mode, ulong perm)
 		elem = p+1;
 	}
 
-	if((fid = _fswalk(fs->root, dir)) == nil){
+	if((fid = fswalk(fs->root, dir)) == nil){
 		if(p)
 			*p = '/';
 		return nil;
 	}
-	tx.type = Tcreate;
-	tx.name = elem;
-	tx.fid = fid->fid;
-	tx.mode = mode;
-	tx.perm = perm;
-	if(_fsrpc(fs, &tx, &rx, 0) < 0){
 	if(p)
 		*p = '/';
+	if(fsfcreate(fid, elem, mode, perm) < 0){
 		fsclose(fid);
 		return nil;
 	}
-	if(p)
-		*p = '/';
-	fid->mode = mode;
 	return fid;
 }

src/lib9pclient/fs.c

@@ -14,6 +14,7 @@ static int _fsgettag(Mux*, void*);
 static int _fssettag(Mux*, void*, uint);
 
 int chatty9pclient;
+int eofkill9pclient;
 
 enum
 {
@@ -318,9 +319,13 @@ static int
 _fssend(Mux *mux, void *pkt)
 {
 	CFsys *fs;
+	int n;
 
 	fs = mux->aux;
-	return iowrite(fs->iosend, fs->fd, pkt, GBIT32((uchar*)pkt));
+	n = iowrite(fs->iosend, fs->fd, pkt, GBIT32((uchar*)pkt));
+	if(n < 0 && eofkill9pclient)
+		threadexitsall(nil);
+	return n;
 }
 
 static void*
@@ -333,8 +338,11 @@ _fsrecv(Mux *mux)
 
 	fs = mux->aux;
 	n = ioreadn(fs->iorecv, fs->fd, buf, 4);
-	if(n != 4)
+	if(n != 4){
+		if(eofkill9pclient)
+			threadexitsall(nil);
 		return nil;
+	}
 	n = GBIT32(buf);
 	pkt = malloc(n+4);
 	if(pkt == nil){
@@ -356,3 +364,9 @@ _fsrecv(Mux *mux)
 	}
 	return pkt;
 }
+
+Qid
+fsqid(CFid *fid)
+{
+	return fid->qid;
+}

src/lib9pclient/open.c

@@ -4,19 +4,29 @@
 #include <9pclient.h>
 #include "fsimpl.h"
 
+int
+fsfopen(CFid *fid, int mode)
+{
+	Fcall tx, rx;
+
+	tx.type = Topen;
+	tx.fid = fid->fid;
+	tx.mode = mode;
+	if(_fsrpc(fid->fs, &tx, &rx, 0) < 0)
+		return -1;
+	fid->mode = mode;
+	return 0;
+}
+
 CFid*
 fsopen(CFsys *fs, char *name, int mode)
 {
 	char e[ERRMAX];
 	CFid *fid;
-	Fcall tx, rx;
 
-	if((fid = _fswalk(fs->root, name)) == nil)
+	if((fid = fswalk(fs->root, name)) == nil)
 		return nil;
-	tx.type = Topen;
+	if(fsfopen(fid, mode) < 0){
-	tx.fid = fid->fid;
-	tx.mode = mode;
-	if(_fsrpc(fs, &tx, &rx, 0) < 0){
 		rerrstr(e, sizeof e);
 		fsclose(fid);
 		errstr(e, sizeof e);

src/lib9pclient/openfd.c

@@ -10,7 +10,7 @@ fsopenfd(CFsys *fs, char *name, int mode)
 	CFid *fid;
 	Fcall tx, rx;
 
-	if((fid = _fswalk(fs->root, name)) == nil)
+	if((fid = fswalk(fs->root, name)) == nil)
 		return -1;
 	tx.type = Topenfd;
 	tx.fid = fid->fid;

src/lib9pclient/remove.c

@@ -12,7 +12,7 @@ fsremove(CFsys *fs, char *name)
 {
 	CFid *fid;
 
-	if((fid = _fswalk(fs->root, name)) == nil)
+	if((fid = fswalk(fs->root, name)) == nil)
 		return -1;
 	return fsfremove(fid);
 }

src/lib9pclient/stat.c

@@ -13,7 +13,7 @@ fsdirstat(CFsys *fs, char *name)
 	Dir *d;
 	CFid *fid;
 
-	if((fid = _fswalk(fs->root, name)) == nil)
+	if((fid = fswalk(fs->root, name)) == nil)
 		return nil;
 	
 	d = fsdirfstat(fid);

src/lib9pclient/walk.c

@@ -8,7 +8,7 @@
 #include "fsimpl.h"
 
 CFid*
-_fswalk(CFid *fid, char *oname)
+fswalk(CFid *fid, char *oname)
 {
 	char *freep, *name;
 	int i, nwalk;

src/lib9pclient/wstat.c

@@ -13,7 +13,7 @@ fsdirwstat(CFsys *fs, char *name, Dir *d)
 	int n;
 	CFid *fid;
 
-	if((fid = _fswalk(fs->root, name)) == nil)
+	if((fid = fswalk(fs->root, name)) == nil)
 		return -1;
 	
 	n = fsdirfwstat(fid, d);