ioping: add builtin version and -v

Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>

Makefile

@@ -27,7 +27,7 @@ install: $(BINS) $(MANS)
 	install -m 644 $(MANS) $(DESTDIR)$(MAN1DIR)
 
 %.o: %.c
-	$(CC) $(CFLAGS) -c -o $@ $^
+	$(CC) $(CFLAGS) -DVERSION=\"${VERSION}\" -c -o $@ $^
 
 ioping: $(OBJS)
 	$(CC) -o $@ $^ $(CFLAGS) $(LDFLAGS)

ioping.1

@@ -58,6 +58,9 @@ Suppress human-readable output.
 .TP
 .B \-h
 Display help message and exit.
+.TP
+.B \-v
+Display version and exit.
 .SS Argument suffixes
 For options that expect time argument (\fB\-i\fR and \fB\-w\fR),
 default is seconds, unless you specify one of the following suffixes

ioping.c

@@ -102,10 +102,16 @@ void usage(void)
 			"      -R              seek rate test (same as -q -i 0 -w 3)\n"
 			"      -q              suppress human-readable output\n"
 			"      -h              display this message and exit\n"
+			"      -v              display version and exit\n"
 			"\n"
 	       );
 }
 
+void version(void)
+{
+	fprintf(stderr, "ioping %s\n", VERSION);
+}
+
 struct suffix {
 	const char	*txt;
 	long long	mul;
@@ -246,11 +252,14 @@ void parse_options(int argc, char **argv)
 		exit(1);
 	}
 
-	while ((opt = getopt(argc, argv, "hLRDCqi:w:s:S:c:o:p:")) != -1) {
+	while ((opt = getopt(argc, argv, "hvLRDCqi:w:s:S:c:o:p:")) != -1) {
 		switch (opt) {
 			case 'h':
 				usage();
 				exit(0);
+			case 'v':
+				version();
+				exit(0);
 			case 'L':
 				randomize = 0;
 				size = 1<<18;