tchange to plumb better - plan9port - [fork] Plan 9 from user space
(HTM) git clone git://src.adamsgaard.dk/plan9port
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---
(DIR) commit 4f604b1843899782071d3dedbb31c6a2e441213f
(DIR) parent 4192ac1de11674c91bbe390fc8afa187657f9223
(HTM) Author: rsc <devnull@localhost>
Date: Wed, 9 Jun 2004 14:04:33 +0000
change to plumb better
Diffstat:
A src/libplumb/fid.c | 144 +++++++++++++++++++++++++++++++
M src/libplumb/mesg.c | 136 -------------------------------
M src/libplumb/mkfile | 1 +
3 files changed, 145 insertions(+), 136 deletions(-)
---
(DIR) diff --git a/src/libplumb/fid.c b/src/libplumb/fid.c
t@@ -0,0 +1,144 @@
+#include <u.h>
+#include <libc.h>
+#include <fcall.h>
+#include <fs.h>
+#include "plumb.h"
+
+static Fsys *fsplumb;
+static int pfd = -1;
+static Fid *pfid;
+
+int
+plumbopen(char *name, int omode)
+{
+ if(fsplumb == nil)
+ fsplumb = nsmount("plumb", "");
+ if(fsplumb == nil)
+ return -1;
+ /*
+ * It's important that when we send something,
+ * we find out whether it was a valid plumb write.
+ * (If it isn't, the client might fall back to some
+ * other mechanism or indicate to the user what happened.)
+ * We can't use a pipe for this, so we have to use the
+ * fid interface. But we need to return a fd.
+ * Return a fd for /dev/null so that we return a unique
+ * file descriptor. In plumbsend we'll look for pfd
+ * and use the recorded fid instead.
+ */
+ if((omode&3) == OWRITE){
+ if(pfd != -1){
+ werrstr("already have plumb send open");
+ return -1;
+ }
+ pfd = open("/dev/null", OWRITE);
+ if(pfd < 0)
+ return -1;
+ pfid = fsopen(fsplumb, name, omode);
+ if(pfid == nil){
+ close(pfd);
+ pfd = -1;
+ return -1;
+ }
+ return pfd;
+ }
+
+ return fsopenfd(fsplumb, name, omode);
+}
+
+Fid*
+plumbopenfid(char *name, int mode)
+{
+ if(fsplumb == nil)
+ fsplumb = nsmount("plumb", "");
+ if(fsplumb == nil)
+ return nil;
+ return fsopen(fsplumb, name, mode);
+}
+
+int
+plumbsendtofid(Fid *fid, Plumbmsg *m)
+{
+ char *buf;
+ int n;
+
+ if(fid == nil){
+ werrstr("invalid fid");
+ return -1;
+ }
+ buf = plumbpack(m, &n);
+ if(buf == nil)
+ return -1;
+ n = fswrite(fid, buf, n);
+ free(buf);
+ return n;
+}
+
+int
+plumbsend(int fd, Plumbmsg *m)
+{
+ if(fd == -1){
+ werrstr("invalid fd");
+ return -1;
+ }
+ if(fd != pfd){
+ werrstr("fd is not the plumber");
+ return -1;
+ }
+ return plumbsendtofid(pfid, m);
+}
+
+Plumbmsg*
+plumbrecv(int fd)
+{
+ char *buf;
+ Plumbmsg *m;
+ int n, more;
+
+ buf = malloc(8192);
+ if(buf == nil)
+ return nil;
+ n = read(fd, buf, 8192);
+ m = nil;
+ if(n > 0){
+ m = plumbunpackpartial(buf, n, &more);
+ if(m==nil && more>0){
+ /* we now know how many more bytes to read for complete message */
+ buf = realloc(buf, n+more);
+ if(buf == nil)
+ return nil;
+ if(readn(fd, buf+n, more) == more)
+ m = plumbunpackpartial(buf, n+more, nil);
+ }
+ }
+ free(buf);
+ return m;
+}
+
+Plumbmsg*
+plumbrecvfid(Fid *fid)
+{
+ char *buf;
+ Plumbmsg *m;
+ int n, more;
+
+ buf = malloc(8192);
+ if(buf == nil)
+ return nil;
+ n = fsread(fid, buf, 8192);
+ m = nil;
+ if(n > 0){
+ m = plumbunpackpartial(buf, n, &more);
+ if(m==nil && more>0){
+ /* we now know how many more bytes to read for complete message */
+ buf = realloc(buf, n+more);
+ if(buf == nil)
+ return nil;
+ if(fsreadn(fid, buf+n, more) == more)
+ m = plumbunpackpartial(buf, n+more, nil);
+ }
+ }
+ free(buf);
+ return m;
+}
+
(DIR) diff --git a/src/libplumb/mesg.c b/src/libplumb/mesg.c
t@@ -7,88 +7,6 @@
static char attrbuf[4096];
char *home;
-static Fsys *fsplumb;
-static int pfd = -1;
-static Fid *pfid;
-int
-plumbopen(char *name, int omode)
-{
- if(fsplumb == nil)
- fsplumb = nsmount("plumb", "");
- if(fsplumb == nil)
- return -1;
- /*
- * It's important that when we send something,
- * we find out whether it was a valid plumb write.
- * (If it isn't, the client might fall back to some
- * other mechanism or indicate to the user what happened.)
- * We can't use a pipe for this, so we have to use the
- * fid interface. But we need to return a fd.
- * Return a fd for /dev/null so that we return a unique
- * file descriptor. In plumbsend we'll look for pfd
- * and use the recorded fid instead.
- */
- if((omode&3) == OWRITE){
- if(pfd != -1){
- werrstr("already have plumb send open");
- return -1;
- }
- pfd = open("/dev/null", OWRITE);
- if(pfd < 0)
- return -1;
- pfid = fsopen(fsplumb, name, omode);
- if(pfid == nil){
- close(pfd);
- pfd = -1;
- return -1;
- }
- return pfd;
- }
-
- return fsopenfd(fsplumb, name, omode);
-}
-
-Fid*
-plumbopenfid(char *name, int mode)
-{
- if(fsplumb == nil)
- fsplumb = nsmount("plumb", "");
- if(fsplumb == nil)
- return nil;
- return fsopen(fsplumb, name, mode);
-}
-
-int
-plumbsendtofid(Fid *fid, Plumbmsg *m)
-{
- char *buf;
- int n;
-
- if(fid == nil){
- werrstr("invalid fid");
- return -1;
- }
- buf = plumbpack(m, &n);
- if(buf == nil)
- return -1;
- n = fswrite(fid, buf, n);
- free(buf);
- return n;
-}
-
-int
-plumbsend(int fd, Plumbmsg *m)
-{
- if(fd == -1){
- werrstr("invalid fd");
- return -1;
- }
- if(fd != pfd){
- werrstr("fd is not the plumber");
- return -1;
- }
- return plumbsendtofid(pfid, m);
-}
static int
Strlen(char *s)
t@@ -422,57 +340,3 @@ plumbunpack(char *buf, int n)
return plumbunpackpartial(buf, n, nil);
}
-Plumbmsg*
-plumbrecv(int fd)
-{
- char *buf;
- Plumbmsg *m;
- int n, more;
-
- buf = malloc(8192);
- if(buf == nil)
- return nil;
- n = read(fd, buf, 8192);
- m = nil;
- if(n > 0){
- m = plumbunpackpartial(buf, n, &more);
- if(m==nil && more>0){
- /* we now know how many more bytes to read for complete message */
- buf = realloc(buf, n+more);
- if(buf == nil)
- return nil;
- if(readn(fd, buf+n, more) == more)
- m = plumbunpackpartial(buf, n+more, nil);
- }
- }
- free(buf);
- return m;
-}
-
-Plumbmsg*
-plumbrecvfid(Fid *fid)
-{
- char *buf;
- Plumbmsg *m;
- int n, more;
-
- buf = malloc(8192);
- if(buf == nil)
- return nil;
- n = fsread(fid, buf, 8192);
- m = nil;
- if(n > 0){
- m = plumbunpackpartial(buf, n, &more);
- if(m==nil && more>0){
- /* we now know how many more bytes to read for complete message */
- buf = realloc(buf, n+more);
- if(buf == nil)
- return nil;
- if(fsreadn(fid, buf+n, more) == more)
- m = plumbunpackpartial(buf, n+more, nil);
- }
- }
- free(buf);
- return m;
-}
-
(DIR) diff --git a/src/libplumb/mkfile b/src/libplumb/mkfile
t@@ -3,6 +3,7 @@
LIB=libplumb.a
OFILES=\
event.$O\
+ fid.$O\
mesg.$O\
thread.$O\