179 lines
4.8 KiB
Groff
179 lines
4.8 KiB
Groff
'\" t
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.\" Title: upscli_get
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.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author]
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.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
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.\" Date: 09/13/2013
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.\" Manual: NUT Manual
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.\" Source: Network UPS Tools 2.7.1-pre1
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.\" Language: English
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.\"
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.TH "UPSCLI_GET" "3" "09/13/2013" "Network UPS Tools 2\&.7\&.1\-p" "NUT Manual"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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upscli_get \- retrieve data from a UPS
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.SH "SYNOPSIS"
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.sp
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.nf
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#include <upsclient\&.h>
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.fi
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.sp
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.nf
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int upscli_get(UPSCONN_t *ups, int numq, const char **query,
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int *numa, char ***answer)
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.fi
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.SH "DESCRIPTION"
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.sp
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The \fBupscli_get()\fR function takes the pointer \fIups\fR to a UPSCONN_t state structure, and the pointer \fIquery\fR to an array of \fInumq\fR query elements\&. It builds a properly\-formatted request from those elements and transmits it to \fBupsd\fR(8)\&.
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.sp
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Upon success, the response will be split into separate components\&. A pointer to those components will be returned in \fIanswer\fR\&. The number of usable answer components will be returned in \fInuma\fR\&.
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.SH "USES"
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.sp
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This function implements the "GET" command in the protocol\&. As a result, you can use it to request many different things from the server\&. Some examples are:
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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GET NUMLOGINS <ups>
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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GET UPSDESC <ups>
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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GET VAR <ups> <var>
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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GET TYPE <ups> <var>
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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GET DESC <ups> <var>
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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GET CMDDESC <ups> <cmd>
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.RE
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.SH "QUERY FORMATTING"
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.sp
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To generate a request for GET NUMLOGINS su700, you would populate query and numq as follows:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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int numq;
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const char *query[2];
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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query[0] = "NUMLOGINS";
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query[1] = "su700";
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numq = 2;
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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All escaping of special characters and quoting of elements with spaces is handled for you inside this function\&.
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.SH "ANSWER FORMATTING"
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.sp
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The raw response from upsd to the above query would be NUMLOGINS su700 1\&. Since this is split up for you, the values work out like this:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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numa = 3;
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answer[0] = "NUMLOGINS"
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answer[1] = "su700"
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answer[2] = "1"
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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Notice that the value which you seek typically starts at answer[numq]\&.
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.SH "ERROR CHECKING"
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.sp
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This function will check your query against the response from \fBupsd\fR(8)\&. For example, if you send "VAR" "su700" "ups\&.status", it will expect to see those at the beginning of the response\&.
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.sp
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If the results from \fBupsd\fR do not pass this case\-insensitive test against your request, this function will return an error\&. When this happens, \fBupscli_upserror\fR(3) will return \fIUPSCLI_ERR_PROTOCOL\fR\&.
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.SH "ANSWER ARRAY LIFETIME"
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.sp
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The pointers contained within the \fIanswer\fR array are only valid until the next call to a \fIupsclient\fR function which references them\&. If you need to use data from multiple calls, you must copy it somewhere else first\&.
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.sp
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The \fIanswer\fR array and its elements may change locations, so you must not rely on previous addresses\&. You must only use the addresses which were returned by the most recent call\&. You also must not attempt to use more than \fInuma\fR elements in \fIanswer\fR\&. Such behavior is undefined, and may yield bogus data or a crash\&.
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.sp
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The array will be deleted after calling \fBupscli_disconnect\fR(3)\&. Any access after that point is also undefined\&.
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.SH "RETURN VALUE"
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.sp
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The \fBupscli_get()\fR function returns 0 on success, or \-1 if an error occurs\&.
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.SH "SEE ALSO"
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.sp
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\fBupscli_list_start\fR(3), \fBupscli_list_next\fR(3), \fBupscli_strerror\fR(3), \fBupscli_upserror\fR(3)
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