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90 lines
3.7 KiB
Groff
90 lines
3.7 KiB
Groff
'\" t
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.TH "SD_JOURNAL_GET_CUTOFF_REALTIME_USEC" "3" "" "systemd 219" "sd_journal_get_cutoff_realtime_usec"
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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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sd_journal_get_cutoff_realtime_usec, sd_journal_get_cutoff_monotonic_usec \- Read cut\-off timestamps from the current journal entry
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.SH "SYNOPSIS"
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.sp
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.ft B
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.nf
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#include <systemd/sd\-journal\&.h>
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.fi
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.ft
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.HP \w'int\ sd_journal_get_cutoff_realtime_usec('u
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.BI "int sd_journal_get_cutoff_realtime_usec(sd_journal\ *" "j" ", uint64_t\ *" "from" ", uint64_t\ *" "to" ");"
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.HP \w'int\ sd_journal_get_cutoff_monotonic_usec('u
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.BI "int sd_journal_get_cutoff_monotonic_usec(sd_journal\ *" "j" ", sd_id128_t\ " "boot_id" ", uint64_t\ *" "from" ", uint64_t\ *" "to" ");"
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.SH "DESCRIPTION"
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.PP
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\fBsd_journal_get_cutoff_realtime_usec()\fR
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retrieves the realtime (wallclock) timestamps of the first and last entries accessible in the journal\&. It takes three arguments: the journal context object
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\fIj\fR
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and two pointers
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\fIfrom\fR
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and
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\fIto\fR
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pointing at 64\-bit unsigned integers to store the timestamps in\&. The timestamps are in microseconds since the epoch, i\&.e\&.
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\fBCLOCK_REALTIME\fR\&. Either one of the two timestamp arguments may be passed as
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\fBNULL\fR
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in case the timestamp is not needed, but not both\&.
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.PP
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\fBsd_journal_get_cutoff_monotonic_usec()\fR
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retrieves the monotonic timestamps of the first and last entries accessible in the journal\&. It takes three arguments: the journal context object
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\fIj\fR, a 128\-bit identifier for the boot
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\fIboot_id\fR, and two pointers to 64\-bit unsigned integers to store the timestamps,
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\fIfrom\fR
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and
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\fIto\fR\&. The timestamps are in microseconds since boot\-up of the specific boot, i\&.e\&.
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\fBCLOCK_MONOTONIC\fR\&. Since the monotonic clock begins new with every reboot it only defines a well\-defined point in time when used together with an identifier identifying the boot, see
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\fBsd_id128_get_boot\fR(3)
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for more information\&. The function will return the timestamps for the boot identified by the passed boot ID\&. Either one of the two timestamp arguments may be passed as
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\fBNULL\fR
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in case the timestamp is not needed, but not both\&.
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.SH "RETURN VALUE"
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.PP
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\fBsd_journal_get_cutoff_realtime_usec()\fR
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and
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\fBsd_journal_get_cutoff_monotonic_usec()\fR
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return 1 on success, 0 if not suitable entries are in the journal or a negative errno\-style error code\&.
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.PP
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Locations pointed to by parameters
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\fIfrom\fR
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and
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\fIto\fR
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will be set only if the return value is positive, and obviously, the parameters are non\-null\&.
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.SH "NOTES"
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.PP
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The
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\fBsd_journal_get_cutoff_realtime_usec()\fR
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and
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\fBsd_journal_get_cutoff_monotonic_usec()\fR
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interfaces are available as a shared library, which can be compiled and linked to with the
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\fBlibsystemd\fR\ \&\fBpkg-config\fR(1)
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file\&.
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.SH "SEE ALSO"
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.PP
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\fBsystemd\fR(1),
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\fBsd-journal\fR(3),
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\fBsd_journal_open\fR(3),
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\fBsd_journal_get_realtime_usec\fR(3),
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\fBsd_id128_get_boot\fR(3),
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\fBclock_gettime\fR(2)
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