'\" t
.TH "SD_VARLINK_IS_CONNECTED" "3" "" "systemd 259" "sd_varlink_is_connected"
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.SH "NAME"
sd_varlink_is_connected, sd_varlink_is_idle \- Query if a Varlink connection object is currently connected or idle
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-varlink\&.h>
.fi
.ft
.HP \w'int\ sd_varlink_is_connected('u
.BI "int sd_varlink_is_connected(sd_varlink\ *" "link" ");"
.HP \w'int\ sd_varlink_is_idle('u
.BI "int sd_varlink_is_idle(sd_varlink\ *" "link" ");"
.SH "DESCRIPTION"
.PP
\fBsd_varlink_is_connected()\fR
checks whether the specified Varlink connection object is currently connected or whether it has been fully disconnected already\&.
.PP
\fBsd_varlink_is_idle()\fR
checks whether the specified Varlink connection object is currently connected but idle, i\&.e\&. may accept a method call for enqueuing (if client side of a Varlink connection) or is waiting for more incoming method calls to arrive (if server side of a Varlink connection)\&.
.SH "RETURN VALUE"
.PP
If the connection is currently connected
\fBsd_varlink_is_connected()\fR
returns a positive non\-zero value\&. If disconnected it returns 0\&. If the connection currently is idle
\fBsd_varlink_is_idle()\fR
returns a positive non\-zero integer\&. If not, returns 0\&. On failure, both functions return a negative
\fIerrno\fR
error code\&.
.SS "Errors"
.PP
Returned errors may indicate the following problems:
.PP
\fB\-EINVAL\fR
.RS 4
The specified Varlink connection is invalid\&.
.RE
.SH "NOTES"
.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\&.
.PP
The code described here uses
\fBgetenv\fR(3), which is declared to be not multi\-thread\-safe\&. This means that the code calling the functions described here must not call
\fBsetenv\fR(3)
from a parallel thread\&. It is recommended to only do calls to
\fBsetenv()\fR
from an early phase of the program when no other threads have been started\&.
.SH "HISTORY"
.PP
\fBsd_varlink_is_connected()\fR
was added in version 259\&.
.PP
\fBsd_varlink_is_idle()\fR
was added in version 257\&.
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1), \fBsd-varlink\fR(3)