upscli_upserror - Man Page

        #include <upsclient​.h>

        int upscli_upserror(UPSCONN_t *ups);

The upscli_upserror() function takes the pointer ups to a UPSCONN_t state structure and returns the value of the internal error number, if any​.

This is typically used to check for certain error values like UPSCLI_ERR_UNKCOMMAND​. That specific error can be used for detecting older versions of upsd(8) which might not support a given command​.

Some error messages have additional meanings, so you should use upscli_strerror(3) to obtain readable error messages​.

The upscli_upserror() function returns one of the UPSCLI_ERR_* values from upsclient​.h, or 0 if no error has occurred​.

upscli_readline(3), upscli_sendline(3), upscli_strerror(3)