ARES_REINIT(3) Introduction to Library Functions ARES_REINIT(3)

NAME

ares_reinit - ReInitialize a resolver channel from system
configuration.

SYNOPSIS

#include <ares.h>

int ares_reinit(ares_channel_t *channel)

DESCRIPTION

The ares_reinit(3) function re-reads the system configuration and
safely applies the configuration to the existing channel. System
configuration will never override user-provided settings such as
provided via ares_init_options(3) or ares_set_servers(3).

Any existing queries will be automatically requeued if the server
they are currently assigned to is removed from the system
configuration.

This function may cause additional file descriptors to be created,
and existing ones to be destroyed if server configuration has
changed.

0d safety, will spawn a background thread to read the configuration
and apply it. It is crucial that developers use the
ARES_OPT_SOCK_STATE_CB or ARES_OPT_EVENT_THREAD so that notifications
of changes are alerted. If using ares_getsock(3) or ares_fds(3), no
notification is possible which could cause a stall.

RETURN VALUES

ares_reinit(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.

AVAILABILITY

This function was first introduced in c-ares version 1.22.0.

SEE ALSO

ares_init(3), ares_init_options(3), ares_destroy(3), ares_dup(3),
ares_library_init(3), ares_set_servers(3), ares_threadsafety(3)

12 November 2023 ARES_REINIT(3)