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sd_varlink_set_relative_timeout(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | SEE ALSO | COLOPHON 

SD_VAR...TIMEOUT(3)  sd_varlink_set_relative_timeout  SD_VAR...TIMEOUT(3)

NAME         top

       sd_varlink_set_relative_timeout - Set method call time-out

SYNOPSIS         top

       #include <systemd/sd-varlink.h>

       int sd_varlink_set_relative_timeout(sd_varlink *link,
                                           uint64_t usec);

DESCRIPTION         top

       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.

       This call is particularly useful for method calls issued via
       sd_varlink_observe() that shall remain open continuously for a
       long time.

RETURN VALUE         top

       On success, sd_varlink_set_relative_timeout() returns a
       non-negative integer. On failure, it returns a negative
       errno-style error code.

   Errors
       Returned errors may indicate the following problems:

       -EINVAL
           An argument is invalid.

NOTES         top

       Functions described here are available as a shared library, which
       can be compiled against and linked to with the
       libsystemd pkg-config(1) file.

       The code described here uses 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) 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.

HISTORY         top

       sd_varlink_set_relative_timeout() was added in version 257.

SEE ALSO         top

       systemd(1), sd-varlink(3)

COLOPHON         top

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have a
       bug report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2026-01-16.  (At that
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       (which is not part of the original manual page), send a mail to
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systemd 260~devel                                     SD_VAR...TIMEOUT(3)

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