NAME¶
ares_init - Initialize a resolver channel
SYNOPSIS¶
#include <ares.h>
int ares_init(ares_channel * channelptr)
DESCRIPTION¶
The
ares_init(3) function initializes a communications channel for name
service lookups. If it returns successfully,
ares_init(3) will set the
variable pointed to by
channelptr to a handle used to identify the name
service channel. The caller should invoke
ares_destroy(3) on the handle
when the channel is no longer needed.
The
ares_init_options(3) function is provide to offer more init
alternatives.
RETURN VALUES¶
ares_init(3) can return any of the following values:
- ARES_SUCCESS
- Initialization succeeded.
- ARES_EFILE
- A configuration file could not be read.
- ARES_ENOMEM
- The process's available memory was exhausted.
- ARES_ENOTINITIALIZED
- c-ares library initialization not yet performed.
NOTES¶
When initializing from
/etc/resolv.conf, ares_init(3) reads the
domain and
search directives to allow lookups of short names
relative to the domains specified. The
domain and
search
directives override one another. If more that one instance of either
domain or
search directives is specified, the last occurrence
wins. For more information, please see the
resolv.conf(5) manual page.
SEE ALSO¶
ares_init_options(3), ares_destroy(3), ares_dup(3),
ares_library_init(3), ares_set_servers(3)
AUTHOR¶
Greg Hudson, MIT Information Systems
Copyright 1998 by the Massachusetts Institute of Technology.
Copyright (C) 2004-2010 by Daniel Stenberg.
