154 lines
3.8 KiB
Groff
154 lines
3.8 KiB
Groff
'\" t
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.\" Title: upscli_list_start
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.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author]
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.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
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.\" Date: 03/02/2016
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.\" Manual: NUT Manual
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.\" Source: Network UPS Tools 2.7.3.1
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.\" Language: English
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.\"
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.TH "UPSCLI_LIST_START" "3" "03/02/2016" "Network UPS Tools 2\&.7\&.3\&." "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_list_start \- begin multi\-item retrieval 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_list_start(UPSCONN_t *ups, unsigned int numq, const char **query)
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.fi
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.SH "DESCRIPTION"
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.sp
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The \fBupscli_list_start()\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 caller must call \fBupscli_list_next\fR(3) to retrieve the elements of the list\&. Failure to retrieve the list will most likely result in the client getting out of sync with the server due to buffered data\&.
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.SH "USES"
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.sp
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This function implements the "LIST" 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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LIST 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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LIST VAR <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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LIST RW <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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LIST CMD <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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LIST ENUM <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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LIST RANGE <ups> <var>
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.RE
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.SH "QUERY FORMATTING"
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.sp
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To see the list of variables on a UPS called \fIsu700\fR, the protocol command would be LIST VAR su700\&. To start that list with this function, 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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unsigned 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] = "VAR";
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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 are handled for you inside this function\&.
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.SH "ERROR CHECKING"
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.sp
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This function checks the response from \fBupsd\fR(8) against your query\&. If it is not starting a list, or is starting the wrong type of list, it will return an error code\&.
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.sp
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When this happens, \fBupscli_upserror\fR(3) will return UPSCLI_ERR_PROTOCOL\&.
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.SH "RETURN VALUE"
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.sp
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The \fBupscli_list_start()\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_fd\fR(3), \fBupscli_get\fR(3), \fBupscli_readline\fR(3), \fBupscli_sendline\fR(3), \fBupscli_ssl\fR(3), \fBupscli_strerror\fR(3), \fBupscli_upserror\fR(3)
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