SD\_VARLINK\_SET\_RELATIVE\_TIMEOUT(3) sd\_varlink\_set\_relative\_timeout SD\_VARLINK\_SET\_RELATIVE\_TIMEOUT(3)

.SH "NAME" sd\_varlink\_set\_relative\_timeout - Set method call time-out

.SH "SYNOPSIS"

```
#include <systemd/sd-varlink.h>
```

.HP 864u **int sd\_varlink\_set\_relative\_timeout(sd\_varlink \*link, uint64\_t usec);**

.SH "DESCRIPTION"

.PP **sd\_varlink\_set\_relative\_timeout()** sets the relative timeout in µs to enforce on Varlink method calls. A default time-out of 45s (currently) applies, which may be changed with this call. Set to **UINT64\_MAX** 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 **io.systemd.TimedOut** error is raised as client-generated reply to the method call.

.PP This call is particularly useful for method calls issued via **sd\_varlink\_observe()** that shall remain open continuously for a long time.

.SH "RETURN VALUE"

.PP On success, **sd\_varlink\_set\_relative\_timeout()** 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 **-EINVAL**

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 **libsystemd** [**pkg-config**(1)](/man/os/systemd/pkg-config.1) file.

.PP The code described here uses [**getenv**(3)](/man/os/systemd/getenv.3), which is declared to be not multi-thread-safe. This means that the code calling the functions described here must not call [**setenv**(3)](/man/os/systemd/setenv.3) from a parallel thread. It is recommended to only do calls to **setenv()** from an early phase of the program when no other threads have been started.

.SH "HISTORY"

.PP **sd\_varlink\_set\_relative\_timeout()** was added in version 257.

.SH "SEE ALSO"

.PP [**systemd**(1)](/man/os/systemd/systemd.1), [**sd-varlink**(3)](/man/os/systemd/sd-varlink.3)

systemd 262.2

---

Document: sd_varlink_set_relative_timeout(3) from systemd 262.2-r1 (Chainguard OS)
Source: https://github.com/systemd/systemd