1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
'\" t
.TH "SD_BUS_MESSAGE_GET_SIGNATURE" "3" "" "systemd 241" "sd_bus_message_get_signature"
.\" -----------------------------------------------------------------
.\" * 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_get_signature, sd_bus_message_is_empty, sd_bus_message_has_signature \- Query bus message signature
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-bus\&.h>
.fi
.ft
.HP \w'const\ char*\ sd_bus_message_get_signature('u
.BI "const char* sd_bus_message_get_signature(sd_bus_message\ *" "message" ", int\ " "complete" ");"
.HP \w'int\ sd_bus_message_is_empty('u
.BI "int sd_bus_message_is_empty(sd_bus_message\ *" "message" ");"
.HP \w'int\ sd_bus_message_has_signature('u
.BI "int sd_bus_message_has_signature(sd_bus_message\ *" "message" ", const\ char\ *" "signature" ");"
.SH "DESCRIPTION"
.PP
\fBsd_bus_message_get_signature()\fR
returns the signature of message
\fImessage\fR\&. If
\fIcomplete\fR
is true, the signature of the whole message is returned, and just the signature of the currently open container otherwise\&.
.PP
\fBsd_bus_message_is_empty()\fR
returns true if the message is empty, i\&.e\&. when its signature is empty\&.
.PP
\fBsd_bus_message_has_signature()\fR
returns true if the signature of the message
\fImessage\fR
matches given
\fIsignature\fR\&. Parameter
\fIsignature\fR
may be
\fBNULL\fR, this is treated the same as an empty string, which is equivalent to calling
\fBsd_bus_message_is_empty()\fR\&.
.SH "RETURN VALUE"
.PP
On success,
\fBsd_bus_message_get_signature()\fR
returns the signature, and
\fBNULL\fR
on error\&.
.PP
The other functions return 0 or a positive integer on success\&. 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
\fBNULL\fR
.RS 4
The
\fImessage\fR
parameter is
\fBNULL\fR\&.
.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_message_new\fR(3)
|
