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
       zero.

   Errors
       Returned errors may indicate the following problems:

       -ENOPKG
           The bus object bus could not be resolved.

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

       -ECHILD
           The bus object bus was created in a different process.

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_bus_can_send() was added in version 221.

SEE ALSO         top

       systemd(1), sd-bus(3)

COLOPHON         top

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systemd 257~devel                                     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)

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