2011-01-26 09:35:08 +00:00
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UPSCLI_LIST_START(3)
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====================
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NAME
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----
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upscli_list_start - begin multi-item retrieval from a UPS
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SYNOPSIS
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--------
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#include <upsclient.h>
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2015-04-30 13:53:36 +00:00
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int upscli_list_start(UPSCONN_t *ups, unsigned int numq, const char **query)
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2011-01-26 09:35:08 +00:00
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DESCRIPTION
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-----------
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The *upscli_list_start()* function takes the pointer 'ups' to a
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`UPSCONN_t` state structure, and the pointer 'query' to an array of
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'numq' query elements. It builds a properly-formatted request from
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those elements and transmits it to linkman:upsd[8].
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Upon success, the caller must call linkman:upscli_list_next[3] to retrieve
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the elements of the list. Failure to retrieve the list will most likely
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result in the client getting out of sync with the server due to buffered
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data.
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USES
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----
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This function implements the "LIST" command in the protocol. As a
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result, you can use it to request many different things from the server.
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Some examples are:
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- LIST UPS
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- LIST VAR <ups>
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- LIST RW <ups>
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- LIST CMD <ups>
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- LIST ENUM <ups> <var>
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2012-06-01 13:55:19 +00:00
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- LIST RANGE <ups> <var>
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2011-01-26 09:35:08 +00:00
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QUERY FORMATTING
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----------------
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To see the list of variables on a UPS called 'su700', the protocol command
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would be `LIST VAR su700`. To start that list with this function, you
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would populate query and numq as follows:
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2015-04-30 13:53:36 +00:00
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unsigned int numq;
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2011-01-26 09:35:08 +00:00
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const char *query[2];
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query[0] = "VAR";
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query[1] = "su700";
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numq = 2;
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All escaping of special characters and quoting of elements with spaces
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are handled for you inside this function.
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ERROR CHECKING
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--------------
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This function checks the response from linkman:upsd[8] against your query.
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If it is not starting a list, or is starting the wrong type of list, it
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will return an error code.
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When this happens, linkman:upscli_upserror[3] will return
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`UPSCLI_ERR_PROTOCOL`.
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RETURN VALUE
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------------
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The *upscli_list_start()* function returns 0 on success, or -1 if an
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error occurs.
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SEE ALSO
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--------
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linkman:upscli_fd[3], linkman:upscli_get[3],
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linkman:upscli_readline[3], linkman:upscli_sendline[3],
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linkman:upscli_ssl[3],
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linkman:upscli_strerror[3], linkman:upscli_upserror[3]
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