'\" t
.TH "SD_JOURNAL_GET_DATA" "3" "" "elogind 252.9" "sd_journal_get_data"
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.SH "NAME"
sd_journal_get_data, sd_journal_enumerate_data, sd_journal_enumerate_available_data, sd_journal_restart_data, SD_JOURNAL_FOREACH_DATA, sd_journal_set_data_threshold, sd_journal_get_data_threshold \- Read data fields from the current journal entry
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <elogind/sd\-journal\&.h>
.fi
.ft
.HP \w'int\ sd_journal_get_data('u
.BI "int sd_journal_get_data(sd_journal\ *" "j" ", const\ char\ *" "field" ", const\ void\ **" "data" ", size_t\ *" "length" ");"
.HP \w'int\ sd_journal_enumerate_data('u
.BI "int sd_journal_enumerate_data(sd_journal\ *" "j" ", const\ void\ **" "data" ", size_t\ *" "length" ");"
.HP \w'int\ sd_journal_enumerate_available_data('u
.BI "int sd_journal_enumerate_available_data(sd_journal\ *" "j" ", const\ void\ **" "data" ", size_t\ *" "length" ");"
.HP \w'void\ sd_journal_restart_data('u
.BI "void sd_journal_restart_data(sd_journal\ *" "j" ");"
.HP \w'SD_JOURNAL_FOREACH_DATA('u
.BI "SD_JOURNAL_FOREACH_DATA(sd_journal\ *" "j" ", const\ void\ *" "data" ", size_t\ " "length" ");"
.HP \w'int\ sd_journal_set_data_threshold('u
.BI "int sd_journal_set_data_threshold(sd_journal\ *" "j" ", size_t\ " "sz" ");"
.HP \w'int\ sd_journal_get_data_threshold('u
.BI "int sd_journal_get_data_threshold(sd_journal\ *" "j" ", size_t\ *" "sz" ");"
.SH "DESCRIPTION"
.PP
As elogind can not open any systemd journals, the functions
\fBsd_journal_get_data\fR,
\fBsd_journal_enumerate_data\fR,
\fBsd_journal_restart_data\fR,
\fBsd_journal_set_data_threshold\fR,
\fBsd_journal_get_data_threshold\fR
and the macro
\fBSD_JOURNAL_FOREACH_DATA\fR
do nothing\&.
.SH "RETURN VALUE"
.PP
\fBsd_journal_get_data()\fR
returns \-ENOENT\&.
\fBsd_journal_restart_data()\fR
returns nothing\&.
\fBsd_journal_enumerate_data()\fR,
\fBsd_journal_set_data_threshold()\fR
and
\fBsd_journal_get_threshold()\fR
return 0\&.
.SH "SEE ALSO"
.PP

\fBelogind\fR(8),
\fBelogind.journal-fields\fR(7),

\fBsd_journal_open\fR(3),
\fBsd_journal_next\fR(3),
\fBsd_journal_get_realtime_usec\fR(3),
\fBsd_journal_query_unique\fR(3)