diff options
author | Lennart Poettering <lennart@poettering.net> | 2018-07-03 16:56:49 +0200 |
---|---|---|
committer | GitHub <noreply@github.com> | 2018-07-03 16:56:49 +0200 |
commit | 98b0b1123cc67ece6c9983fa303fc3de887a21c3 (patch) | |
tree | cf3cfe6246aa04e7b8513a8a966011df12ee8c35 /man/sd_bus_message_read_basic.xml | |
parent | cfffa385a3dfbd6bccb0961185e17dbfde95d4bb (diff) | |
parent | 50972aac44aaa21934d0b1f8985a9b3182f9a067 (diff) | |
download | systemd-98b0b1123cc67ece6c9983fa303fc3de887a21c3.tar.gz |
Merge pull request #9490 from keszybz/document-sd_message_read
Document sd_bus_message_read
Diffstat (limited to 'man/sd_bus_message_read_basic.xml')
-rw-r--r-- | man/sd_bus_message_read_basic.xml | 162 |
1 files changed, 152 insertions, 10 deletions
diff --git a/man/sd_bus_message_read_basic.xml b/man/sd_bus_message_read_basic.xml index bc4220910e..e39cfd5bd6 100644 --- a/man/sd_bus_message_read_basic.xml +++ b/man/sd_bus_message_read_basic.xml @@ -52,18 +52,130 @@ </para> <para> - If <parameter>p</parameter> is not NULL, it should contain a pointer to an - appropriate object. For example, if <parameter>type</parameter> is - <constant>'y'</constant>, the object passed in <parameter>p</parameter> - should have type <code>uint8_t *</code>. If <parameter>type</parameter> - is <constant>'s'</constant>, the object passed in <parameter>p</parameter> - should have type <code>const char **</code>. Note that, if the basic type - is a pointer (e.g., <code>const char *</code> in the case of a string), - the pointer is only borrowed and the contents must be copied if they are - to be used after the end of the messages lifetime. Similarly, during the - lifetime of such a pointer, the message must not be modified. + If <parameter>p</parameter> is not <constant>NULL</constant>, it should contain + a pointer to an appropriate object. For example, if <parameter>type</parameter> + is <constant>'y'</constant>, the object passed in <parameter>p</parameter> + should have type <code>uint8_t *</code>. If <parameter>type</parameter> is + <constant>'s'</constant>, the object passed in <parameter>p</parameter> should + have type <code>const char **</code>. Note that, if the basic type is a pointer + (e.g., <code>const char *</code> in the case of a string), the pointer is only + borrowed and the contents must be copied if they are to be used after the end + of the messages lifetime. Similarly, during the lifetime of such a pointer, the + message must not be modified. See the table below for a complete list of allowed + types. </para> + <table id='format-specifiers'> + <title>Item type specifiers</title> + + <tgroup cols='4'> + <colspec colname='specifier' /> + <colspec colname='constant' /> + <colspec colname='description' /> + <colspec colname='ctype' /> + <thead> + <row> + <entry>Specifier</entry> + <entry>Constant</entry> + <entry>Description</entry> + <entry>Expected C Type</entry> + </row> + </thead> + <tbody> + <row> + <entry><literal>y</literal></entry> + <entry><constant>SD_BUS_TYPE_BYTE</constant></entry> + <entry>unsigned integer</entry> + <entry>uint8_t *</entry> + </row> + + <row> + <entry><literal>b</literal></entry> + <entry><constant>SD_BUS_TYPE_BOOLEAN</constant></entry> + <entry>boolean</entry> + <entry>int *</entry> + </row> + + <row> + <entry><literal>n</literal></entry> + <entry><constant>SD_BUS_TYPE_INT16</constant></entry> + <entry>signed integer</entry> + <entry>int16_t *</entry> + </row> + + <row> + <entry><literal>q</literal></entry> + <entry><constant>SD_BUS_TYPE_UINT16</constant></entry> + <entry>unsigned integer</entry> + <entry>uint16_t *</entry> + </row> + + <row> + <entry><literal>i</literal></entry> + <entry><constant>SD_BUS_TYPE_INT32</constant></entry> + <entry>signed integer</entry> + <entry>int32_t *</entry> + </row> + + <row> + <entry><literal>u</literal></entry> + <entry><constant>SD_BUS_TYPE_UINT32</constant></entry> + <entry>unsigned integer</entry> + <entry>uint32_t *</entry> + </row> + + <row> + <entry><literal>x</literal></entry> + <entry><constant>SD_BUS_TYPE_INT64</constant></entry> + <entry>signed integer</entry> + <entry>int64_t *</entry> + </row> + + <row> + <entry><literal>t</literal></entry> + <entry><constant>SD_BUS_TYPE_UINT64</constant></entry> + <entry>unsigned integer</entry> + <entry>uint64_t *</entry> + </row> + + <row> + <entry><literal>d</literal></entry> + <entry><constant>SD_BUS_TYPE_DOUBLE</constant></entry> + <entry>floating-point</entry> + <entry>double *</entry> + </row> + + <row> + <entry><literal>s</literal></entry> + <entry><constant>SD_BUS_TYPE_STRING</constant></entry> + <entry>Unicode string</entry> + <entry>const char **</entry> + </row> + + <row> + <entry><literal>o</literal></entry> + <entry><constant>SD_BUS_TYPE_OBJECT_PATH</constant></entry> + <entry>object path</entry> + <entry>const char **</entry> + </row> + + <row> + <entry><literal>g</literal></entry> + <entry><constant>SD_BUS_TYPE_SIGNATURE</constant></entry> + <entry>signature</entry> + <entry>const char **</entry> + </row> + + <row> + <entry><literal>h</literal></entry> + <entry><constant>SD_BUS_TYPE_UNIX_FD</constant></entry> + <entry>UNIX file descriptor</entry> + <entry>int *</entry> + </row> + </tbody> + </tgroup> + </table> + <para> If there is no object of the specified type at the current position in the message, an error is returned. @@ -80,12 +192,42 @@ </para> </refsect1> + <refsect1 id='errors'> + <title>Errors</title> + + <para>Returned errors may indicate the following problems:</para> + + <variablelist> + <varlistentry> + <term><constant>-EINVAL</constant></term> + + <listitem><para>Specified type string is invalid or the message parameter is + <constant>NULL</constant>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-ENXIO</constant></term> + + <listitem><para>The message does not contain the specified type at current + position.</para></listitem> + </varlistentry> + + <varlistentry> + <term><constant>-EBADMSG</constant></term> + + <listitem><para>The message cannot be parsed.</para></listitem> + </varlistentry> + </variablelist> + </refsect1> + <refsect1> <title>See Also</title> <para> <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_bus_message_read</refentrytitle><manvolnum>3</manvolnum></citerefentry> </para> </refsect1> |