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-'\" t
-.TH "SD_JOURNAL_GET_DATA" "3" "" "systemd 221" "sd_journal_get_data"
-.\" -----------------------------------------------------------------
-.\" * Define some portability stuff
-.\" -----------------------------------------------------------------
-.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-.\" http://bugs.debian.org/507673
-.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
-.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-.ie \n(.g .ds Aq \(aq
-.el       .ds Aq '
-.\" -----------------------------------------------------------------
-.\" * set default formatting
-.\" -----------------------------------------------------------------
-.\" disable hyphenation
-.nh
-.\" disable justification (adjust text to left margin only)
-.ad l
-.\" -----------------------------------------------------------------
-.\" * MAIN CONTENT STARTS HERE *
-.\" -----------------------------------------------------------------
-.SH "NAME"
-sd_journal_get_data, sd_journal_enumerate_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 <systemd/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'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
-\fBsd_journal_get_data()\fR
-gets the data object associated with a specific field from the current journal entry\&. It takes four arguments: the journal context object, a string with the field name to request, plus a pair of pointers to pointer/size variables where the data object and its size shall be stored in\&. The field name should be an entry field name\&. Well\-known field names are listed in
-\fBsystemd.journal-fields\fR(7)\&. The returned data is in a read\-only memory map and is only valid until the next invocation of
-\fBsd_journal_get_data()\fR
-or
-\fBsd_journal_enumerate_data()\fR, or the read pointer is altered\&. Note that the data returned will be prefixed with the field name and \*(Aq=\*(Aq\&. Also note that by default data fields larger than 64K might get truncated to 64K\&. This threshold may be changed and turned off with
-\fBsd_journal_set_data_threshold()\fR
-(see below)\&.
-.PP
-\fBsd_journal_enumerate_data()\fR
-may be used to iterate through all fields of the current entry\&. On each invocation the data for the next field is returned\&. The order of these fields is not defined\&. The data returned is in the same format as with
-\fBsd_journal_get_data()\fR
-and also follows the same life\-time semantics\&.
-.PP
-\fBsd_journal_restart_data()\fR
-resets the data enumeration index to the beginning of the entry\&. The next invocation of
-\fBsd_journal_enumerate_data()\fR
-will return the first field of the entry again\&.
-.PP
-Note that the
-\fBSD_JOURNAL_FOREACH_DATA()\fR
-macro may be used as a handy wrapper around
-\fBsd_journal_restart_data()\fR
-and
-\fBsd_journal_enumerate_data()\fR\&.
-.PP
-Note that these functions will not work before
-\fBsd_journal_next\fR(3)
-(or related call) has been called at least once, in order to position the read pointer at a valid entry\&.
-.PP
-\fBsd_journal_set_data_threshold()\fR
-may be used to change the data field size threshold for data returned by
-\fBsd_journal_get_data()\fR,
-\fBsd_journal_enumerate_data()\fR
-and
-\fBsd_journal_enumerate_unique()\fR\&. This threshold is a hint only: it indicates that the client program is interested only in the initial parts of the data fields, up to the threshold in size \-\- but the library might still return larger data objects\&. That means applications should not rely exclusively on this setting to limit the size of the data fields returned, but need to apply a explicit size limit on the returned data as well\&. This threshold defaults to 64K by default\&. To retrieve the complete data fields this threshold should be turned off by setting it to 0, so that the library always returns the complete data objects\&. It is recommended to set this threshold as low as possible since this relieves the library from having to decompress large compressed data objects in full\&.
-.PP
-\fBsd_journal_get_data_threshold()\fR
-returns the currently configured data field size threshold\&.
-.SH "RETURN VALUE"
-.PP
-\fBsd_journal_get_data()\fR
-returns 0 on success or a negative errno\-style error code\&. If the current entry does not include the specified field, \-ENOENT is returned\&. If
-\fBsd_journal_next\fR(3)
-has not been called at least once, \-EADDRNOTAVAIL is returned\&.
-\fBsd_journal_enumerate_data()\fR
-returns a positive integer if the next field has been read, 0 when no more fields are known, or a negative errno\-style error code\&.
-\fBsd_journal_restart_data()\fR
-returns nothing\&.
-\fBsd_journal_set_data_threshold()\fR
-and
-\fBsd_journal_get_threshold()\fR
-return 0 on success or a negative errno\-style error code\&.
-.SH "NOTES"
-.PP
-The
-\fBsd_journal_get_data()\fR,
-\fBsd_journal_enumerate_data()\fR,
-\fBsd_journal_restart_data()\fR,
-\fBsd_journal_set_data_threshold()\fR
-and
-\fBsd_journal_get_data_threshold()\fR
-interfaces are available as a shared library, which can be compiled and linked to with the
-\fBlibsystemd\fR\ \&\fBpkg-config\fR(1)
-file\&.
-.SH "EXAMPLES"
-.PP
-See
-\fBsd_journal_next\fR(3)
-for a complete example how to use
-\fBsd_journal_get_data()\fR\&.
-.PP
-Use the
-\fBSD_JOURNAL_FOREACH_DATA\fR
-macro to iterate through all fields of the current journal entry:
-.sp
-.if n \{\
-.RS 4
-.\}
-.nf
-\&.\&.\&.
-int print_fields(sd_journal *j) {
-  const void *data;
-  size_t length;
-  SD_JOURNAL_FOREACH_DATA(j, data, length)
-    printf("%\&.*s\en", (int) length, data);
-}
-\&.\&.\&.
-.fi
-.if n \{\
-.RE
-.\}
-.SH "SEE ALSO"
-.PP
-\fBsystemd\fR(1),
-\fBsystemd.journal-fields\fR(7),
-\fBsd-journal\fR(3),
-\fBsd_journal_open\fR(3),
-\fBsd_journal_next\fR(3),
-\fBsd_journal_get_realtime_usec\fR(3),
-\fBsd_journal_query_unique\fR(3)