Only show hdisk and append a timestamp

.gitignore

@@ -48,5 +48,6 @@ Thumbs.db
 *.mov
 *.wmv
 
-# C objects
+# C objects and binary
 *.o
+aix-disk-perfstat

Makefile

@@ -3,13 +3,14 @@
 
 CC=gcc
 CFLAGS=
+BIN=aix-disk-perfstat
 
-default: test
+default: main
 
-test: test.o 
-	$(CC) -lperfstat -o test test.o
+main: main.o 
+	$(CC) -lperfstat -o $(BIN) main.c
 
 clean:
-	-rm -f test.o
-	-rm -f test
+	-rm -f main.o
+	-rm -f $(BIN)
 

main.c

@@ -3,17 +3,25 @@ Repeatable prints disk statistics and sleeps for 10 seconds
 Modified example from: https://www.ibm.com/docs/en/aix/7.3?topic=interfaces-perfstat-disk-interface
 */
 
+#include <time.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <libperfstat.h>
 
+int startsWith(const char *a, const char *b) {
+	if(strncmp(a, b, strlen(b)) == 0) return 1;
+	return 0;
+}
+
+
 int main(int argc, char* argv[]) {
 
         int i, ret, tot;
         perfstat_disk_t *statp;
         perfstat_id_t first;
+	time_t now;
 
         /* check how many perfstat_disk_t structures are available */
         tot =  perfstat_disk(NULL, NULL, sizeof(perfstat_disk_t), 0);
@@ -50,9 +58,17 @@ int main(int argc, char* argv[]) {
                 }
 
 
+		// Obtain current time
+		// `time()` returns the current time of the system as a `time_t` value
+		time(&now);
+
                 /* print statistics for each of the disks */
                 for (i = 0; i < ret; i++) {
                         
+			if(!startsWith(statp[i].name, "hdisk")) {
+				continue;
+			}
+
                         unsigned long bsize = statp[i].bsize;   // Disk block size (in bytes).
                         unsigned long rblks = statp[i].rblks;   // Number of blocks read from disk.
                         unsigned long wblks = statp[i].wblks;   // Number of blocks written to disk.
@@ -90,7 +106,8 @@ int main(int argc, char* argv[]) {
                         }
 
 
-                        printf("%s => reads: [ blocks: %10u (%8u ), bytes: %10u (%8u ) ], writes: [ blocks: %10u (%8u ), bytes: %10u (%8u ) ]\n",
+                        printf("%s - %s => reads: [ blocks: %10u (%8u ), bytes: %10u (%8u ) ], writes: [ blocks: %10u (%8u ), bytes: %10u (%8u ) ]\n",
+				strtok(ctime(&now), "\n"),
 				statp[i].name,
 				rblks,
 				drblbks,
@@ -111,3 +128,4 @@ int main(int argc, char* argv[]) {
         }
 
 }
+