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ares_set_sortlist - Initialize an ares_channel sortlist configuration

 #include <ares.h> 

 int ares_set_sortlist(ares_channel channel, const char *sortstr) 

The ares_set_sortlist(3) function initializes an address sortlist configuration for the channel data identified by channel , so that addresses returned by ares_gethostbyname(3) 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, "130.155.160.0/255.255.240.0 130.155.0.0". This function replaces any potentially previously configured address sortlist with the ones given in the configuration string. ares_set_sortlist(3) may return any of the following values:

15 ARES_SUCCESS The sortlist configuration was successfully initialized.

15 ARES_ENOMEM The process's available memory was exhausted.

15 ARES_ENODATA The channel data identified by channel was invalid.

15 ARES_ENOTINITIALIZED c-ares library initialization not yet performed.

ares_init_options (3), ares_dup(3) ares_set_sortlist(3) was added in c-ares 1.11.0