upscli_init_default_connect_timeout - Initialize upsclient module aspect of default timeout for initial

       The upscli_init_default_connect_timeout() function initializes upsclient module aspect of default
       connection timeout for upscli_connect(3), which may be important when e.g. upsc(8) scripting or upsmon(8)
       configuration refers to unresponsive hosts, or when the host name resolution lags, etc. By default,
       upscli_connect(3) blocks indefinitely in its attempts to connect (or until the system transport layer
       interrupts such an attempt).

       It populates the value from different sources, mostly C strings which represent a floating-point
       non-negative number (invalid parsing is logged and may impact the return value), any or all of them may
       be NULL to skip, and in specific order (last valid hit wins):

       •   built-in 0 meaning indefinitely blocking (NUT default for this method over at least 20 years);

       •   the number from default_secs as a particular NUT or third-party client program’s built-in preferred
           (low-priority) default;

       •   the number from NUT_DEFAULT_CONNECT_TIMEOUT environment variable as a site-local preference
           (generally pre-set in nut.conf(5));

       •   the number from config_secs as a particular NUT or third-party client program’s configuration file
           default;

       •   the number from cli_secs as a particular NUT or third-party client program’s setting from command
           line (highest priority).

       Internally, calls upscli_set_default_connect_timeout(3) for most of the string related processing.

       The upsclient module tracks if upscli_init_default_connect_timeout() function was called and succeeded,
       in order to call it once (if never used) from the upscli_connect(3) or upscli_init(3) methods. This
       allows unmodified (legacy) NUT clients to consistently benefit from presence of the
       NUT_DEFAULT_CONNECT_TIMEOUT environment variable.

       This tracking does not preclude programs from explicitly calling the method any amount of times.

       upscli_init_default_connect_timeout - Initialize upsclient module aspect of default timeout for initial
       connections.

       The upscli_init_default_connect_timeout() function returns 0 on success (either if all strings were NULL
       so the built-in default is applied, or at least one of those strings that were set was valid and its
       value got applied), or -1 if an error occurs (at least one string was not NULL, and none of the strings
       was valid).

upscli_connect(3), upscli_tryconnect(3), upscli_set_default_connect_timeout(3),
       upscli_get_default_connect_timeout(3), upscli_init(3)

Network UPS Tools 2.8.3                            07/08/2025                            UPSCLI_INIT_DEFAULT_(3)

               #include <upsclient.h>

               int upscli_init_default_connect_timeout(
                       const char *cli_secs,
                       const char *config_secs,
                       const char *default_secs);