mirror of
https://github.com/systemd/systemd-stable.git
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man: update sd_bus_open() documentation
Update for current function prototypes. Also, document -ESOCKTNOSUPPORT as being returned when protocol version mismatches are detected.
This commit is contained in:
Lennart Poettering
parent
1c2e9646e4
commit
4a2af8d76f
@ -769,6 +769,7 @@ if ENABLE_KDBUS
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MANPAGES += \
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man/sd_bus_creds_get_pid.3 \
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man/sd_bus_creds_new_from_pid.3 \
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man/sd_bus_default.3 \
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man/sd_bus_error.3 \
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man/sd_bus_message_append.3 \
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man/sd_bus_message_append_array.3 \
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@ -779,7 +780,6 @@ MANPAGES += \
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man/sd_bus_message_get_monotonic_usec.3 \
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man/sd_bus_negotiate_fds.3 \
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man/sd_bus_new.3 \
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man/sd_bus_open_user.3 \
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man/sd_bus_path_encode.3 \
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man/sd_bus_request_name.3 \
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man/sd_event_add_child.3 \
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@ -850,9 +850,11 @@ MANPAGES_ALIAS += \
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man/sd_bus_message_get_seqnum.3 \
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man/sd_bus_negotiate_creds.3 \
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man/sd_bus_negotiate_timestamps.3 \
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man/sd_bus_open.3 \
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man/sd_bus_open_system.3 \
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man/sd_bus_open_system_container.3 \
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man/sd_bus_open_system_machine.3 \
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man/sd_bus_open_system_remote.3 \
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man/sd_bus_open_user.3 \
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man/sd_bus_path_decode.3 \
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man/sd_bus_ref.3 \
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man/sd_bus_release_name.3 \
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@ -909,8 +911,8 @@ man/sd_bus_creds_has_inheritable_cap.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_has_permitted_cap.3: man/sd_bus_creds_get_pid.3
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man/sd_bus_creds_ref.3: man/sd_bus_creds_new_from_pid.3
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man/sd_bus_creds_unref.3: man/sd_bus_creds_new_from_pid.3
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man/sd_bus_default_system.3: man/sd_bus_open_user.3
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man/sd_bus_default_user.3: man/sd_bus_open_user.3
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man/sd_bus_default_system.3: man/sd_bus_default.3
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man/sd_bus_default_user.3: man/sd_bus_default.3
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man/sd_bus_error_copy.3: man/sd_bus_error.3
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man/sd_bus_error_free.3: man/sd_bus_error.3
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man/sd_bus_error_get_errno.3: man/sd_bus_error.3
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@ -930,9 +932,11 @@ man/sd_bus_message_get_reply_cookie.3: man/sd_bus_message_get_cookie.3
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man/sd_bus_message_get_seqnum.3: man/sd_bus_message_get_monotonic_usec.3
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man/sd_bus_negotiate_creds.3: man/sd_bus_negotiate_fds.3
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man/sd_bus_negotiate_timestamps.3: man/sd_bus_negotiate_fds.3
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man/sd_bus_open_system.3: man/sd_bus_open_user.3
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man/sd_bus_open_system_container.3: man/sd_bus_open_user.3
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man/sd_bus_open_system_remote.3: man/sd_bus_open_user.3
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man/sd_bus_open.3: man/sd_bus_default.3
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man/sd_bus_open_system.3: man/sd_bus_default.3
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man/sd_bus_open_system_machine.3: man/sd_bus_default.3
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man/sd_bus_open_system_remote.3: man/sd_bus_default.3
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man/sd_bus_open_user.3: man/sd_bus_default.3
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man/sd_bus_path_decode.3: man/sd_bus_path_encode.3
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man/sd_bus_ref.3: man/sd_bus_new.3
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man/sd_bus_release_name.3: man/sd_bus_request_name.3
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@ -1059,10 +1063,10 @@ man/sd_bus_creds_ref.html: man/sd_bus_creds_new_from_pid.html
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man/sd_bus_creds_unref.html: man/sd_bus_creds_new_from_pid.html
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$(html-alias)
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man/sd_bus_default_system.html: man/sd_bus_open_user.html
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man/sd_bus_default_system.html: man/sd_bus_default.html
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$(html-alias)
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man/sd_bus_default_user.html: man/sd_bus_open_user.html
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man/sd_bus_default_user.html: man/sd_bus_default.html
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$(html-alias)
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man/sd_bus_error_copy.html: man/sd_bus_error.html
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@ -1122,13 +1126,19 @@ man/sd_bus_negotiate_creds.html: man/sd_bus_negotiate_fds.html
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man/sd_bus_negotiate_timestamps.html: man/sd_bus_negotiate_fds.html
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$(html-alias)
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man/sd_bus_open_system.html: man/sd_bus_open_user.html
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man/sd_bus_open.html: man/sd_bus_default.html
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$(html-alias)
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man/sd_bus_open_system_container.html: man/sd_bus_open_user.html
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man/sd_bus_open_system.html: man/sd_bus_default.html
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$(html-alias)
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man/sd_bus_open_system_remote.html: man/sd_bus_open_user.html
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man/sd_bus_open_system_machine.html: man/sd_bus_default.html
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$(html-alias)
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man/sd_bus_open_system_remote.html: man/sd_bus_default.html
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$(html-alias)
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man/sd_bus_open_user.html: man/sd_bus_default.html
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$(html-alias)
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man/sd_bus_path_decode.html: man/sd_bus_path_encode.html
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@ -1721,6 +1731,7 @@ EXTRA_DIST += \
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man/sd_booted.xml \
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man/sd_bus_creds_get_pid.xml \
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man/sd_bus_creds_new_from_pid.xml \
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man/sd_bus_default.xml \
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man/sd_bus_error.xml \
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man/sd_bus_message_append.xml \
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man/sd_bus_message_append_array.xml \
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@ -1731,7 +1742,6 @@ EXTRA_DIST += \
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man/sd_bus_message_get_monotonic_usec.xml \
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man/sd_bus_negotiate_fds.xml \
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man/sd_bus_new.xml \
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man/sd_bus_open_user.xml \
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man/sd_bus_path_encode.xml \
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man/sd_bus_request_name.xml \
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man/sd_event_add_child.xml \
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@ -21,10 +21,10 @@
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd_bus_open_user" conditional="ENABLE_KDBUS">
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<refentry id="sd_bus_default" conditional="ENABLE_KDBUS">
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<refentryinfo>
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<title>sd_bus_open_user</title>
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<title>sd_bus_default</title>
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<productname>systemd</productname>
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<authorgroup>
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@ -38,26 +38,48 @@
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_bus_open_user</refentrytitle>
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<refentrytitle>sd_bus_default</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_bus_open_user</refname>
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<refname>sd_bus_open_system</refname>
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<refname>sd_bus_open_system_remote</refname>
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<refname>sd_bus_open_system_container</refname>
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<refname>sd_bus_default</refname>
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<refname>sd_bus_default_user</refname>
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<refname>sd_bus_default_system</refname>
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<refpurpose>Open a connection to the system or user bus</refpurpose>
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<refname>sd_bus_open</refname>
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<refname>sd_bus_open_user</refname>
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<refname>sd_bus_open_system</refname>
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<refname>sd_bus_open_system_remote</refname>
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<refname>sd_bus_open_system_machine</refname>
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<refpurpose>Acquire a connection to a system or user bus</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_bus_default</function></funcdef>
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<paramdef>sd_bus **<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_default_user</function></funcdef>
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<paramdef>sd_bus **<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_default_system</function></funcdef>
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<paramdef>sd_bus **<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_open</function></funcdef>
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<paramdef>sd_bus **<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_open_user</function></funcdef>
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<paramdef>sd_bus **<parameter>bus</parameter></paramdef>
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@ -70,36 +92,59 @@
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<funcprototype>
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<funcdef>int <function>sd_bus_open_system_remote</function></funcdef>
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<paramdef>sd_bus **<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>host</parameter></paramdef>
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<paramdef>sd_bus **<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_open_system_container</function></funcdef>
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<funcdef>int <function>sd_bus_open_system_machine</function></funcdef>
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<paramdef>sd_bus **<parameter>bus</parameter></paramdef>
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<paramdef>const char *<parameter>machine</parameter></paramdef>
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<paramdef>sd_bus **<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_default_user</function></funcdef>
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<paramdef>sd_bus **<parameter>bus</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_default_system</function></funcdef>
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<paramdef>sd_bus **<parameter>bus</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_bus_open_user()</function> creates a new bus
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object and opens a connection to the user bus.
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<function>sd_bus_open_system()</function> does the same, but
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<para><function>sd_bus_default()</function> acquires a bus
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connection object to the user bus when invoked in user context or
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to the system bus otherwise. The connection object is associated
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to the calling thread. Each time the function is invoked from the
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same thread the same object is returned, but its reference count
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increased by one, as long as at least one reference is kept. When
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the last reference to the connection is dropped (using the
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<function>sd_bus_unref()</function> call), the connection is
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terminated. Note that the connection is not automatically
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terminated when the associated thread ends. It is important to
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drop the last reference to the bus connection explicitly before
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the thread ends or otherwise the connection will be leaked.</para>
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<para><function>sd_bus_default_user()</function> returns a user
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bus connection object associated to the calling thread.
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<function>sd_bus_default_system()</function> is similar, but
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connects to the system bus.</para>
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<para><function>sd_bus_open()</function> creates a new,
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independent bus connection to the user bus when invoked in user
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context or the system bus
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otherwise. <function>sd_bus_open_user()</function> is similar, but
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connects only to the user bus.
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<function>sd_bus_open_system()</function> does the same, but
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connects to the system bus. In contrast to
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<function>sd_bus_default()</function>,
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<function>sd_bus_default_user()</function>,
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<function>sd_bus_default_system()</function> these calls return
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new, independent connection objects that are not associated with
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the invoking thread and are not shared between multiple
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invocations. It is recommended to share connections per thread to
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efficiently make use the available resources. Thus, it is
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recommended to use <function>sd_bus_default()</function>,
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<function>sd_bus_default_user()</function>,
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<function>sd_bus_default_system()</function> to connect to the
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user or system busses.</para>
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<para>If the <varname>$DBUS_SESSION_BUS_ADDRESS</varname> environment
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variable is set
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(cf. <citerefentry project='man-pages'><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>),
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@ -108,10 +153,10 @@
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this variable is not set, a suitable default for the default user
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D-Bus instance will be used.</para>
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<para>If the <varname>$DBUS_SYSTEM_BUS_ADDRESS</varname> environment
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variable is set, it will be used as the address of the system
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bus. This variable uses the same syntax as
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<varname>$DBUS_SESSION_BUS_ADDRESS</varname>/. If this variable is
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<para>If the <varname>$DBUS_SYSTEM_BUS_ADDRESS</varname>
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environment variable is set, it will be used as the address of the
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system bus. This variable uses the same syntax as
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<varname>$DBUS_SESSION_BUS_ADDRESS</varname>. If this variable is
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not set, a suitable default for the default system D-Bus instance
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will be used.</para>
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@ -123,20 +168,11 @@
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<para><function>sd_bus_open_system_container()</function> connects
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to the system bus in the specified <parameter>machine</parameter>,
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where <parameter>machine</parameter> is the name of a container.
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See
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where <parameter>machine</parameter> is the name of a local
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container. See
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<citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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for more information about "machines".</para>
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<para><function>sd_bus_default_user()</function> returns a bus
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object connected to the user bus. Each thread has its own object, but it
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may be passed around. It is created on the first invocation of
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<function>sd_bus_default_user()</function>, and subsequent
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invocations returns a reference to the same object.</para>
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<para><function>sd_bus_default_system()</function> is similar to
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<function>sd_bus_default_user()</function>, but connects to the
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system bus.</para>
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</refsect1>
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<refsect1>
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@ -149,7 +185,8 @@
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<refsect1>
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<title>Reference ownership</title>
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<para>Functions <function>sd_bus_open_user()</function>,
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<para>The functions <function>sd_bus_open_user()</function>,
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<function>sd_bus_open()</function>,
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<function>sd_bus_open_system()</function>,
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<function>sd_bus_open_system_remote()</function>, and
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<function>sd_bus_open_system_machine()</function> return a new
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@ -158,9 +195,13 @@
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<citerefentry><refentrytitle>sd_bus_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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</para>
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<para>The functions <function>sd_bus_default_user()</function> and
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<function>sd_bus_default_system()</function> do not create a new
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reference.</para>
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<para>The functions <function>sd_bus_default()</function>,
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<function>sd_bus_default_user()</function> and
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<function>sd_bus_default_system()</function> do not necessarily
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create a new object, but increase the connection reference by
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one. Use
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<citerefentry><refentrytitle>sd_bus_unref</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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to drop the reference.</para>
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</refsect1>
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<refsect1>
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@ -173,9 +214,7 @@
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<varlistentry>
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<term><constant>-EINVAL</constant></term>
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<listitem><para>Specified parameter is invalid
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(<constant>NULL</constant> in case of output
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parameters).</para></listitem>
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<listitem><para>The specified parameters are invalid.</para></listitem>
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</varlistentry>
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<varlistentry>
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@ -184,18 +223,25 @@
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<listitem><para>Memory allocation failed.</para></listitem>
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</varlistentry>
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<para>In addition, any further connection-related errors may be
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by returned. See <citerefentry><refentrytitle>sd_bus_send</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
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<varlistentry>
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<term><constant>-ESOCKTNOSUPPORT</constant></term>
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<listitem><para>The protocol version required to connect to the selected bus is not supported.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>In addition, any further connection-related errors may be
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by returned. See <citerefentry><refentrytitle>sd_bus_send</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para><function>sd_bus_open_user()</function> and other functions
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described here are available as a shared library, which can be
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compiled and linked to with the
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<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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<para><function>sd_bus_open_user()</function> and the other
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functions described here are available as a shared library, which
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can be compiled and linked to with the
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<constant>libsystemd</constant> <citerefentry
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project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</para>
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</refsect1>
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