sd_bus_can_send(3) — Linux manual page


SD_BUS_CAN_SEND(3)           sd_bus_can_send          SD_BUS_CAN_SEND(3)

NAME         top

       sd_bus_can_send - Check which types can be sent over a bus object

SYNOPSIS         top

       #include <systemd/sd-bus.h>

       void sd_bus_can_send(sd_bus *bus, char type);

DESCRIPTION         top

       sd_bus_can_send() is mostly used for checking if file descriptor
       passing is available on the given bus.  type can be any of the
       SD_BUS_TYPE constants.

RETURN VALUE         top

       On failure, sd_bus_can_send() returns a negative errno-style
       error code. If values of the given type can be sent over the
       given bus, it returns a positive integer. Otherwise, it returns

       Returned errors may indicate the following problems:

           The bus object bus could not be resolved.

           Added in version 246.

           The input parameter bus is NULL or the bus is not connected.

           Added in version 246.

           The bus object bus was created in a different process.

           Added in version 246.

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

HISTORY         top

       sd_bus_can_send() was added in version 246.

SEE ALSO         top

       systemd(1), sd-bus(3)

COLOPHON         top

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       This page was obtained from the project's upstream Git repository
       ⟨⟩ on 2023-12-22.  (At that
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systemd 255                                           SD_BUS_CAN_SEND(3)

Pages that refer to this page: sd-bus(3)sd_bus_negotiate_fds(3)systemd.directives(7)systemd.index(7)