#include <ares.h> int ares_set_sortlist(ares_channel channel, const char *sortstr)
The ares_set_sortlist function initializes an address sortlist configuration for the channel data identified by channel , so that addresses returned by ares_gethostbyname are sorted according to the sortlist. The provided sortstr string that holds a space separated list of IP-address-netmask pairs. The netmask is optional but follows the address after a slash if present. For example, "22.214.171.124/255.255.240.0 126.96.36.199".
This function replaces any potentially previously configured address sortlist with the ones given in the configuration string.
ares_set_sortlist may return any of the following values:
ARES_SUCCESS The sortlist configuration was successfully initialized.
ARES_ENOMEM The process's available memory was exhausted.
ARES_ENODATA The channel data identified by channel was invalid.
ares_set_sortlist(3) was added in c-ares 1.11.0
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