nut-debian/docs/man/upscli_readline.3

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.\"     Title: upscli_readline
.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
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.\"      Date: 04/26/2022
.\"    Manual: NUT Manual
.\"    Source: Network UPS Tools 2.8.0
.\"  Language: English
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.TH "UPSCLI_READLINE" "3" "04/26/2022" "Network UPS Tools 2\&.8\&.0" "NUT Manual"
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.SH "NAME"
upscli_readline, upscli_readline_timeout \- read a single response from a UPS
.SH "SYNOPSIS"
.sp
.nf
#include <upsclient\&.h>
#include <time\&.h> /* or <sys/time\&.h> on some platforms */
.fi
.sp
.nf
int upscli_readline(UPSCONN_t *ups, char *buf, size_t buflen);
.fi
.sp
.nf
int upscli_readline_timeout(UPSCONN_t *ups, char *buf, size_t buflen,
                               const time_t timeout);
.fi
.SH "DESCRIPTION"
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The \fBupscli_readline()\fR and \fBupscli_readline_timeout()\fR functions take the pointer \fIups\fR to a UPSCONN_t state structure, receive a single line from the server, and copy up to \fIbuflen\fR bytes of the response into the buffer \fIbuf\fR\&.
.sp
Some parsing of the string occurs during reception\&. In particular, ERR messages from \fBupsd\fR(8) are detected and will cause this function to return \-1\&.
.sp
The difference between the two functions is that \fBupscli_readline_timeout()\fR lets the caller decide the amount of time (\fItimeout\fR seconds) after which it should give up and return, whereas \fBupscli_readline()\fR does not offer this freedom, and uses NUT default network timeout (5 seconds)\&.
.SH "RETURN VALUE"
.sp
The \fBupscli_readline()\fR and \fBupscli_readline_timeout()\fR functions return 0 on success, or \-1 if an error occurs\&.
.SH "SEE ALSO"
.sp
\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)