[PATCH v2 4/8] rt-migrate-test.c: Check return values of write() and ftruncate()

[Cheng-Yang Chou <yphbchou0911@gmail.com>]

Add error handling for write() to tracefs and ftruncate() on shared memory
to avoid ignoring errors.

Signed-off-by: Cheng-Yang Chou <yphbchou0911@gmail.com>
---
 src/rt-migrate-test/rt-migrate-test.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/rt-migrate-test/rt-migrate-test.c b/src/rt-migrate-test/rt-migrate-test.c
index 8afe083..e007ed7 100644
--- a/src/rt-migrate-test/rt-migrate-test.c
+++ b/src/rt-migrate-test/rt-migrate-test.c
@@ -61,6 +61,7 @@ static void ftrace_write(const char *fmt, ...)
 {
 	va_list ap;
 	int n;
+	int ret;
 
 	if (mark_fd < 0)
 		return;
@@ -69,7 +70,9 @@ static void ftrace_write(const char *fmt, ...)
 	n = vsnprintf(buff, BUFSIZ, fmt, ap);
 	va_end(ap);
 
-	write(mark_fd, buff, n);
+	ret = write(mark_fd, buff, n);
+	if (ret < 0)
+		fprintf(stderr, "%s: write failed\n", __func__);
 }
 
 #define nano2sec(nan) (nan / 1000000000ULL)
-- 
2.48.1