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

[John Kacur <jkacur@redhat.com>]

On Sat, 26 Jul 2025, Cheng-Yang Chou wrote:

> 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)
> -- 

Signed-off-by: John Kacur <jkacur@redhat.com>