[PATCH] Confirm success for each tc -batch command

["Petr Písař" <ppisar@redhat.com>]

If `tc -force -batch' is fed by a controlling program from a pipe,
it's not possible to recognize when a command has been processes
successfully.

This patch adds an optional `-OK' option to the tc(8) tool, so `tc
-force -OK -batch' will print "OK\n" to standard output on each
successfully completed tc command.

Signed-off-by: Petr Písař <ppisar@redhat.com>
---
 man/man8/tc.8 | 8 +++++++-
 tc/tc.c       | 8 +++++++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/man/man8/tc.8 b/man/man8/tc.8
index e0acfeb..583eae2 100644
--- a/man/man8/tc.8
+++ b/man/man8/tc.8
@@ -49,7 +49,7 @@ DEV
 DEV
 
 .P
-.B tc [ -force ] -b\fR[\fIatch\fR] \fB[ filename ]
+.B tc [ -force ] [ -OK ] -b\fR[\fIatch\fR] \fB[ filename ]
 
 .ti 8
 .IR FORMAT " := {"
@@ -440,6 +440,12 @@ First failure will cause termination of tc.
 don't terminate tc on errors in batch mode.
 If there were any errors during execution of the commands, the application return code will be non zero.
 
+.TP
+.BR "\-OK"
+in batch mode, print
+.B OK
+and a new line on standard output after each successfully interpreted command.
+
 .SH HISTORY
 .B tc
 was written by Alexey N. Kuznetsov and added in Linux 2.2.
diff --git a/tc/tc.c b/tc/tc.c
index 9b50e74..b43bb47 100644
--- a/tc/tc.c
+++ b/tc/tc.c
@@ -39,6 +39,7 @@ int batch_mode = 0;
 int resolve_hosts = 0;
 int use_iec = 0;
 int force = 0;
+int ok = 0;
 struct rtnl_handle rth;
 
 static void *BODY = NULL;	/* cached handle dlopen(NULL) */
@@ -183,7 +184,7 @@ noexist:
 static void usage(void)
 {
 	fprintf(stderr, "Usage: tc [ OPTIONS ] OBJECT { COMMAND | help }\n"
-			"       tc [-force] -batch filename\n"
+			"       tc [-force] [-OK] -batch filename\n"
 	                "where  OBJECT := { qdisc | class | filter | action | monitor }\n"
 	                "       OPTIONS := { -s[tatistics] | -d[etails] | -r[aw] | -p[retty] | -b[atch] [filename] }\n");
 }
@@ -251,6 +252,9 @@ static int batch(const char *name)
 			ret = 1;
 			if (!force)
 				break;
+		} else if (ok) {
+			printf("OK\n");
+			fflush(stdout);
 		}
 	}
 	if (line)
@@ -288,6 +292,8 @@ int main(int argc, char **argv)
 			return 0;
 		} else if (matches(argv[1], "-force") == 0) {
 			++force;
+		} else if (matches(argv[1], "-OK") == 0) {
+			++ok;
 		} else 	if (matches(argv[1], "-batch") == 0) {
 			argc--;	argv++;
 			if (argc <= 1)
-- 
1.8.3.1