'\" t
.TH "SD_VARLINK_SET_RELATIVE_TIMEOUT" "3" "" "systemd 259" "sd_varlink_set_relative_timeout"
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.SH "NAME"
sd_varlink_set_relative_timeout \- Set method call time\-out
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-varlink\&.h>
.fi
.ft
.HP \w'int\ sd_varlink_set_relative_timeout('u
.BI "int sd_varlink_set_relative_timeout(sd_varlink\ *" "link" ", uint64_t\ " "usec" ");"
.SH "DESCRIPTION"
.PP
\fBsd_varlink_set_relative_timeout()\fR
sets the relative timeout in \(mcs to enforce on Varlink method calls\&. A default time\-out of 45s (currently) applies, which may be changed with this call\&. Set to
\fBUINT64_MAX\fR
to disable the time\-out, and to 0 to revert to revert back to the default time\-out\&. The time\-out begins whenever a method call is started, and if no response is received by the time the time\-out elapses a synthetic
\fBio\&.systemd\&.TimedOut\fR
error is raised as client\-generated reply to the method call\&.
.PP
This call is particularly useful for method calls issued via
\fBsd_varlink_observe()\fR
that shall remain open continuously for a long time\&.
.SH "RETURN VALUE"
.PP
On success,
\fBsd_varlink_set_relative_timeout()\fR
returns a non\-negative integer\&. On failure, it returns a negative errno\-style error code\&.
.SS "Errors"
.PP
Returned errors may indicate the following problems:
.PP
\fB\-EINVAL\fR
.RS 4
An argument 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_set_relative_timeout()\fR
was added in version 257\&.
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1), \fBsd-varlink\fR(3)