if_nametoindex net_if.h if_nametoindex - map a network interface name to its corresponding index unsigned if_nametoindex(const char *ifname);
ilogb math.h ilogb, ilogbf, ilogbl - return an unbiased exponent int ilogb(double x);
ilogbf math.h ilogb, ilogbf, ilogbl - return an unbiased exponent int ilogbf(float x);
if_nametoindex net_if.h if_nametoindex - map a network interface name to its corresponding index unsigned if_nametoindex(const char *ifname);
ilogb math.h ilogb, ilogbf, ilogbl - return an unbiased exponent int ilogb(double x);
ilogbf math.h ilogb, ilogbf, ilogbl - return an unbiased exponent int ilogbf(float x);