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'\" t
.TH "SD_BUS_CAN_SEND" "3" "" "systemd 254" "sd_bus_can_send"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
sd_bus_can_send \- Check which types can be sent over a bus object
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-bus\&.h>
.fi
.ft
.HP \w'void\ sd_bus_can_send('u
.BI "void sd_bus_can_send(sd_bus\ *" "bus" ", char\ " "type" ");"
.SH "DESCRIPTION"
.PP
\fBsd_bus_can_send()\fR
is mostly used for checking if file descriptor passing is available on the given bus\&.
\fItype\fR
can be any of the
\fBSD_BUS_TYPE\fR
constants\&.
.SH "RETURN VALUE"
.PP
On failure,
\fBsd_bus_can_send()\fR
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\&.
.SS "Errors"
.PP
Returned errors may indicate the following problems:
.PP
\fB\-ENOPKG\fR
.RS 4
The bus object
\fIbus\fR
could not be resolved\&.
.RE
.PP
\fB\-ENOTCONN\fR
.RS 4
The input parameter
\fIbus\fR
is
\fBNULL\fR
or the bus is not connected\&.
.RE
.PP
\fB\-ECHILD\fR
.RS 4
The bus object
\fIbus\fR
was created in a different process\&.
.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 "SEE ALSO"
.PP
\fBsystemd\fR(1),
\fBsd-bus\fR(3)
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