[dpdk-stable] [PATCH v3 1/1] fbarray: get fbarrays from containerized secondary

[Burakov, Anatoly]

On 11-Jul-19 11:31 AM, yasufum.o at gmail.com wrote:
> From: Yasufumi Ogawa <ogawa.yasufumi at lab.ntt.co.jp>
> 
> In secondary_msl_create_walk(), it creates a file for fbarrays with its
> PID for reserving unique name among secondary processes. However, it
> does not work if secondary is run as app container because each of
> containerized secondary has PID 1. To reserve unique name, use hostname
> instead of PID because hostname is assigned as a short form of 64
> digits full container ID in docker.
> 
> Cc: stable at dpdk.org
> 
> Signed-off-by: Yasufumi Ogawa <ogawa.yasufumi at lab.ntt.co.jp>
> ---

<...>

> +	if (getpid() == 1) {
> +		FILE *hn_fp;
> +		hn_fp = fopen("/etc/hostname", "r");
> +		if (hn_fp == NULL) {
> +			RTE_LOG(ERR, EAL,
> +				"Cannot open '/etc/hostname' for secondary\n");
> +			return -1;
> +		}
> +
> +		/* with docker, /etc/hostname just has one entry of hostname */
> +		if (fscanf(hn_fp, "%s", proc_id) == EOF) {

Apologies for not pointing this out earlier, but do i understand 
correctly that there's no bounds checking here, and fscanf() will write 
however many bytes it wants?

-- 
Thanks,
Anatoly