exportfs, oexportfs, iostats: make -d log to stderr

exportfs -d logs 9p traffic to /tmp/exportdb.
-f allows writing to a different file.
exportfs silently continues if it doesn't have
permissions to create or write to /tmp/exportdb.
These are poor behaviors.

A better default is to write to stderr, since it
is 9P debug info that is better immediately printed,
and not user info that is better handled by syslog().
As a result, -f is obsolete and thus removed.
Redirect responsibility is now on rc.
As a side effect, rc will fail if it doesn't
have permissions to write.

exportfs(4) is updated to reflect all changes
and with a better Synopsis.

oexportfs is changed to match exportfs.
oexportfs(4) is updated to reflect all changes.
The Synopsis is not changed due to the number of flags.

Removed -f from iostats.
iostats(4) is updated to reflect all changes.
---

1 files changed, 2 insertions, 10 deletions

diff --git a/sys/src/cmd/iostats.c b/sys/src/cmd/iostats.c
index 421f531a9..cd32239ff 100644
--- a/sys/src/cmd/iostats.c
+++ b/sys/src/cmd/iostats.c
@@ -6,7 +6,6 @@
 #include <auth.h>
 #include <fcall.h>
 
-#define DEBUGFILE	"iostats.out"
 #define DONESTR		"done"
 
 enum{
@@ -250,7 +249,7 @@ rio(Fcall *fin, Fcall *fout)
 void
 usage(void)
 {
-	fprint(2, "usage: iostats [-dC] [-f debugfile] cmds [args ...]\n");
+	fprint(2, "usage: iostats [-dC] cmds [args ...]\n");
 	exits("usage");
 }
 
@@ -259,7 +258,6 @@ main(int argc, char **argv)
 {
 	Rpc *rpc;
 	ulong ttime;
-	char *dbfile;
 	char buf[64*1024];
 	float brpsec, bwpsec, bppsec;
 	int cpid, fspid, expid, rspid, dbg, n, mflag;
@@ -270,15 +268,11 @@ main(int argc, char **argv)
 
 	dbg = 0;
 	mflag = MREPL;
-	dbfile = DEBUGFILE;
 
 	ARGBEGIN{
 	case 'd':
 		dbg++;
 		break;
-	case 'f':
-		dbfile = ARGF();
-		break;
 	case 'C':
 		mflag |= MCACHE;
 		break;
@@ -286,8 +280,6 @@ main(int argc, char **argv)
 		usage();
 	}ARGEND
 
-	USED(dbfile);
-
 	if(argc == 0)
 		usage();
 
@@ -359,7 +351,7 @@ main(int argc, char **argv)
 		close(efd[1]);
 		close(pfd[1]);
 		if(dbg){
-			execl("/bin/exportfs", "exportfs", "-df", dbfile, "-r", "/", nil);
+			execl("/bin/exportfs", "exportfs", "-d", "-r", "/", nil);
 		} else {
 			execl("/bin/exportfs", "exportfs", "-r", "/", nil);
 		}