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'\" t
.TH "SD_BUS_MESSAGE_SET_EXPECT_REPLY" "3" "" "systemd 241" "sd_bus_message_set_expect_reply"
.\" -----------------------------------------------------------------
.\" * 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_message_set_expect_reply, sd_bus_message_get_expect_reply, sd_bus_message_set_auto_start, sd_bus_message_get_auto_start \- Set and query bus message metadata
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-bus\&.h>
.fi
.ft
.HP \w'int\ sd_bus_message_set_expect_reply('u
.BI "int sd_bus_message_set_expect_reply(sd_bus_message\ *" "message" ", int\ " "b" ");"
.HP \w'int\ sd_bus_message_get_expect_reply('u
.BI "int sd_bus_message_get_expect_reply(sd_bus_message\ *" "message" ");"
.HP \w'int\ sd_bus_message_set_auto_start('u
.BI "int sd_bus_message_set_auto_start(sd_bus_message\ *" "message" ", int\ " "b" ");"
.HP \w'int\ sd_bus_message_get_auto_start('u
.BI "int sd_bus_message_get_auto_start(sd_bus_message\ *" "message" ");"
.SH "DESCRIPTION"
.PP
\fBsd_bus_message_set_expect_reply()\fR
sets or clears the
\fBNO_REPLY_EXPECTED\fR
flag on the message
\fIm\fR\&. This flag matters only for method call messages and is used to specify that no method return or error reply is expected\&. It is ignored for other types\&. Thus, for a method call message, calling
.sp
.if n \{\
.RS 4
.\}
.nf
sd_bus_message_set_expect_reply(\&..., 0)
.fi
.if n \{\
.RE
.\}
.sp
sets the flag and suppresses the reply\&.
.PP
\fBsd_bus_message_get_expect_reply()\fR
checks if the
\fBNO_REPLY_EXPECTED\fR
flag is set on the message
\fIm\fR\&. It will return positive if it is not set, and zero if it is\&.
.PP
\fBsd_bus_message_set_auto_start()\fR
sets or clears the
\fBNO_AUTO_START\fR
flag on the message
\fIm\fR\&. When the flag is set the bus must not launch an owner for the destination name in response to this message\&. Calling
.sp
.if n \{\
.RS 4
.\}
.nf
sd_bus_message_set_auto_start(\&..., 0)
.fi
.if n \{\
.RE
.\}
.sp
sets the flag\&.
.PP
\fBsd_bus_message_get_auto_start()\fR
checks if the
\fBNO_AUTO_START\fR
flag is set on the message
\fIm\fR\&. It will return positive if it is not set, and zero if it is\&.
.SH "RETURN VALUE"
.PP
On success, these functions return 0 or a positive integer\&. On failure, they return a negative errno\-style error code\&.
.SH "ERRORS"
.PP
Returned errors may indicate the following problems:
.PP
\fB\-EINVAL\fR
.RS 4
The
\fImessage\fR
parameter is
\fBNULL\fR\&.
.RE
.PP
\fB\-EPERM\fR
.RS 4
The message
\fImessage\fR
is sealed when trying to set a flag\&.
.sp
The message
\fImessage\fR
has wrong type\&.
.RE
.SH "NOTES"
.PP
These APIs are implemented as a shared library, which can be compiled and linked to with the
\fBlibsystemd\fR\ \&\fBpkg-config\fR(1)
file\&.
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1),
\fBsd-bus\fR(3),
\fBsd_bus_set_description\fR(3)
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