Re: [dpdk-dev] [RFC v3 4/6] eal: add a helper for reading string from sysfs

[Stephen Hemminger]

On Tue,  1 Jun 2021 11:06:42 +0800
Chenbo Xia <chenbo....@intel.com> wrote:

>  
> +int
> +rte_eal_parse_sysfs_str(const char *filename, char *buf, unsigned long sz)
> +{
> +     FILE *f;
> +
> +     f = fopen(filename, "r");
> +     if (f == NULL) {
> +             RTE_LOG(ERR, EAL, "%s(): cannot open sysfs file %s\n",
> +                     __func__, filename);

Helpful to decode errno.
                RTE_LOG(ERR, EAL, "%s(): cannot open sysfs file %s:%s\n",
                        __func__, filename, strerror(errno));