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-rw-r--r--samples/bpf/test_overhead_user.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/samples/bpf/test_overhead_user.c b/samples/bpf/test_overhead_user.c
index 6caf47afa635..9d6dcaa9db92 100644
--- a/samples/bpf/test_overhead_user.c
+++ b/samples/bpf/test_overhead_user.c
@@ -6,6 +6,7 @@
*/
#define _GNU_SOURCE
#include <sched.h>
+#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <asm/unistd.h>
@@ -44,8 +45,13 @@ static void test_task_rename(int cpu)
exit(1);
}
start_time = time_get_ns();
- for (i = 0; i < MAX_CNT; i++)
- write(fd, buf, sizeof(buf));
+ for (i = 0; i < MAX_CNT; i++) {
+ if (write(fd, buf, sizeof(buf)) < 0) {
+ printf("task rename failed: %s\n", strerror(errno));
+ close(fd);
+ return;
+ }
+ }
printf("task_rename:%d: %lld events per sec\n",
cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
close(fd);
@@ -63,8 +69,13 @@ static void test_urandom_read(int cpu)
exit(1);
}
start_time = time_get_ns();
- for (i = 0; i < MAX_CNT; i++)
- read(fd, buf, sizeof(buf));
+ for (i = 0; i < MAX_CNT; i++) {
+ if (read(fd, buf, sizeof(buf)) < 0) {
+ printf("failed to read from /dev/urandom: %s\n", strerror(errno));
+ close(fd);
+ return;
+ }
+ }
printf("urandom_read:%d: %lld events per sec\n",
cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
close(fd);