参数

flags

Determines what information is parsed from the resolv.conf file. See the man page for resolv.conf for the format of this file.

The following directives are not parsed from the file: sortlist, rotate, no-check-names, inet6, debug .

If this function encounters an error, the possible return values are:

• 1 = failed to open file
• 2 = failed to stat file
• 3 = file too large
• 4 = out of memory
• 5 = short read from file
• 6 = no nameservers listed in the file

filename

Path to resolv.conf file.