'\" t
.TH "SD_JOURNAL_HAS_RUNTIME_FILES" "3" "" "systemd 256.7" "sd_journal_has_runtime_files"
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.SH "NAME"
sd_journal_has_runtime_files, sd_journal_has_persistent_files \- Query availability of runtime or persistent journal files
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-journal\&.h>
.fi
.ft
.HP \w'int\ sd_journal_has_runtime_files('u
.BI "int sd_journal_has_runtime_files(sd_journal\ *" "j" ");"
.HP \w'int\ sd_journal_has_persistent_files('u
.BI "int sd_journal_has_persistent_files(sd_journal\ *" "j" ");"
.SH "DESCRIPTION"
.PP
\fBsd_journal_has_runtime_files()\fR
returns a positive value if runtime journal files (present in /run/systemd/journal/) have been found\&. Otherwise returns 0\&.
.PP
\fBsd_journal_has_persistent_files()\fR
returns a positive value if persistent journal files (present in /var/log/journal/) have been found\&. Otherwise returns 0\&.
.SH "RETURN VALUE"
.PP
Both
\fBsd_journal_has_runtime_files()\fR
and
\fBsd_journal_has_persistent_files()\fR
return \-EINVAL if their argument is
\fBNULL\fR\&.
.SH "NOTES"
.PP
All functions listed here are thread\-agnostic and only a single specific thread may operate on a given object during its entire lifetime\&. It\*(Aqs safe to allocate multiple independent objects and use each from a specific thread in parallel\&. However, it\*(Aqs not safe to allocate such an object in one thread, and operate or free it from any other, even if locking is used to ensure these threads don\*(Aqt operate on it at the very same time\&.
.PP
Functions described here are available as a shared library, which can be compiled against and linked to with the
\fBlibsystemd\fR\ \&\fBpkg-config\fR(1)
file\&.
.SH "HISTORY"
.PP
\fBsd_journal_has_runtime_files()\fR
and
\fBsd_journal_has_persistent_files()\fR
were added in version 229\&.
.SH "SEE ALSO"
.PP
\fBsd-journal\fR(3)