login: add new public API call sd_login_monitor_get_events() to get poll() flags...

We should keep our options open, so that we can watch for POLLOUT later
on if we wish to. CUrrently this call will always return POLLIN however.

diff --git a/man/sd_journal_get_fd.xml b/man/sd_journal_get_fd.xml
index e57431ea9e3c964d7cdccacaf75c2641e7962e55..f29aeaab23e9b32b8398562920e2f7887cab00a0 100644 (file)
--- a/man/sd_journal_get_fd.xml
+++ b/man/sd_journal_get_fd.xml
@@ -115,11 +115,11 @@
                 below.</para>
 
                 <para><function>sd_journal_get_events()</function>
-                will return the
-                <citerefentry><refentrytitle>poll</refentrytitle><manvolnum>2</manvolnum></citerefentry>
-                mask to wait for. This function will return a
-                combination of POLLIN and POLLOUT and similar to fill
-                into the <literal>.events</literal> field of
+                will return the <function>poll()</function> mask to
+                wait for. This function will return a combination of
+                <literal>POLLIN</literal> and
+                <literal>POLLOUT</literal> and similar to fill into
+                the <literal>.events</literal> field of
                 <literal>struct pollfd</literal>.</para>
 
                 <para><function>sd_journal_reliable_fd()</function>
@@ -134,7 +134,7 @@
                 <function>sd_journal_get_fd()</function> are
                 sufficient as only source for wake-ups.</para>
 
-                <para>After each <literal>poll()</literal> wake-up
+                <para>After each <function>poll()</function> wake-up
                 <function>sd_journal_process()</function> needs to be
                 called to process events. This call will also indicate
                 what kind of change has been detected (see below; note
@@ -169,9 +169,9 @@
                 errno-style error code.</para>
 
                 <para><function>sd_journal_get_events()</function>
-                returns a combination of POLLIN, POLLOUT and suchlike
-                on success or a negative errno-style error
-                code.</para>
+                returns a combination of <literal>POLLIN</literal>,
+                <literal>POLLOUT</literal> and suchlike on success or
+                a negative errno-style error code.</para>
 
                 <para><function>sd_journal_reliable_fd()</function>
                 returns a positive integer if the file descriptor

diff --git a/man/sd_login_monitor_new.xml b/man/sd_login_monitor_new.xml
index 2c4d05dcb944bf3617dd145def2fa71b9ad1d038..94428771a86687db8094861eb077be467fccea34 100644 (file)
--- a/man/sd_login_monitor_new.xml
+++ b/man/sd_login_monitor_new.xml
@@ -47,6 +47,7 @@
                 <refname>sd_login_monitor_unref</refname>
                 <refname>sd_login_monitor_flush</refname>
                 <refname>sd_login_monitor_get_fd</refname>
+                <refname>sd_login_monitor_get_events</refname>
                 <refname>sd_login_monitor</refname>
                 <refpurpose>Monitor login sessions, seats and users</refpurpose>
         </refnamediv>
@@ -76,6 +77,11 @@
                                 <paramdef>sd_login_monitor* <parameter>m</parameter></paramdef>
                         </funcprototype>
 
+                        <funcprototype>
+                                <funcdef>int <function>sd_login_monitor_get_events</function></funcdef>
+                                <paramdef>sd_login_monitor* <parameter>m</parameter></paramdef>
+                        </funcprototype>
+
                 </funcsynopsis>
         </refsynopsisdiv>
 
@@ -122,14 +128,24 @@
                 application defined event loop, based around
                 <citerefentry><refentrytitle>poll</refentrytitle><manvolnum>2</manvolnum></citerefentry>
                 or a similar interface. The application should include
-                the returned file descriptor as wake up source for
-                POLLIN events. Whenever a wake-up is triggered the
-                file descriptor needs to be reset via
+                the returned file descriptor as wake-up source for the
+                events mask returned by
+                <function>sd_login_monitor_get_events()</function>. Whenever
+                a wake-up is triggered the file descriptor needs to be
+                reset via
                 <function>sd_login_monitor_flush()</function>. An
                 application needs to reread the login state with a
                 function like
                 <citerefentry><refentrytitle>sd_get_seats</refentrytitle><manvolnum>3</manvolnum></citerefentry>
                 or similar to determine what changed.</para>
+
+                <para><function>sd_login_monitor_get_events()</function>
+                will return the <function>poll()</function> mask to
+                wait for. This function will return a combination of
+                <literal>POLLIN</literal>, <literal>POLLOUT</literal>
+                and similar to fill into the
+                <literal>.events</literal> field of <literal>struct
+                pollfd</literal>.</para>
         </refsect1>
 
         <refsect1>
@@ -140,8 +156,12 @@
                 <function>sd_login_monitor_flush()</function> return 0
                 or a positive integer. On success
                 <function>sd_login_monitor_get_fd()</function> returns
-                a Unix file descriptor. On failure, these calls return
-                a negative errno-style error code.</para>
+                a Unix file descriptor. On success
+                <function>sd_login_monitor_get_events()</function>
+                returns a combination of <literal>POLLIN</literal>,
+                <literal>POLLOUT</literal> and suchlike. On failure,
+                these calls return a negative errno-style error
+                code.</para>
 
                 <para><function>sd_login_monitor_unref()</function>
                 always returns NULL.</para>
@@ -151,10 +171,12 @@
                 <title>Notes</title>
 
                 <para>The <function>sd_login_monitor_new()</function>,
-                <function>sd_login_monitor_unref()</function>, <function>sd_login_monitor_flush()</function> and
-                <function>sd_login_monitor_get_fd()</function> interfaces
-                are available as shared library, which can be compiled
-                and linked to with the
+                <function>sd_login_monitor_unref()</function>,
+                <function>sd_login_monitor_flush()</function>,
+                <function>sd_login_monitor_get_fd()</function> and
+                <function>sd_login_monitor_get_events()</function>
+                interfaces are available as shared library, which can
+                be compiled and linked to with the
                 <literal>libsystemd-login</literal>
                 <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                 file.</para>
@@ -166,7 +188,8 @@
                 <para>
                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>sd_get_seats</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+                        <citerefentry><refentrytitle>sd_get_seats</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>poll</refentrytitle><manvolnum>2</manvolnum></citerefentry>
                 </para>
         </refsect1>
 

diff --git a/src/login/libsystemd-login.sym b/src/login/libsystemd-login.sym
index 272b0e2b5201be0bfafa72bf14b0c7d37b12796e..55a828773bca26472d3b3aa8dfe255c45a3244f2 100644 (file)
--- a/src/login/libsystemd-login.sym
+++ b/src/login/libsystemd-login.sym
@@ -58,3 +58,8 @@ LIBSYSTEMD_LOGIN_198 {
 global:
         sd_session_get_tty;
 } LIBSYSTEMD_LOGIN_186;
+
+LIBSYSTEMD_LOGIN_201 {
+global:
+        sd_login_monitor_get_events;
+} LIBSYSTEMD_LOGIN_198;

diff --git a/src/login/sd-login.c b/src/login/sd-login.c
index 8867e8c8eb7f309fd60f8f4f163425b2e5f8422a..861a57166dc7633de27dd54ce1d0568e6779adcc 100644 (file)
--- a/src/login/sd-login.c
+++ b/src/login/sd-login.c
@@ -23,6 +23,7 @@
 #include <string.h>
 #include <errno.h>
 #include <sys/inotify.h>
+#include <sys/poll.h>
 
 #include "util.h"
 #include "cgroup-util.h"
@@ -797,3 +798,11 @@ _public_ int sd_login_monitor_get_fd(sd_login_monitor *m) {
 
         return MONITOR_TO_FD(m);
 }
+
+_public_ int sd_login_monitor_get_events(sd_login_monitor *m) {
+
+        if (!m)
+                return -EINVAL;
+
+        return POLLIN;
+}

diff --git a/src/login/test-login.c b/src/login/test-login.c
index 159ff3efc5b3f07fa1bacfaad7a2a5055d51ffdd..f639129636e68fddc47aeb310ab845b2f69a35e2 100644 (file)
--- a/src/login/test-login.c
+++ b/src/login/test-login.c
@@ -185,7 +185,7 @@ int main(int argc, char* argv[]) {
 
         zero(pollfd);
         pollfd.fd = sd_login_monitor_get_fd(m);
-        pollfd.events = POLLIN;
+        pollfd.events = sd_login_monitor_get_events(m);
 
         for (n = 0; n < 5; n++) {
                 r = poll(&pollfd, 1, -1);

diff --git a/src/systemd/sd-login.h b/src/systemd/sd-login.h
index 3746b45cf36500abdcfd9a6f187bd477c8498289..57255bd4a9698b200d8608eb1e4439ff4f5f3b8b 100644 (file)
--- a/src/systemd/sd-login.h
+++ b/src/systemd/sd-login.h
@@ -156,6 +156,9 @@ int sd_login_monitor_flush(sd_login_monitor *m);
 /* Get FD from monitor */
 int sd_login_monitor_get_fd(sd_login_monitor *m);
 
+/* Get poll() mask to monitor */
+int sd_login_monitor_get_events(sd_login_monitor *m);
+
 #ifdef __cplusplus
 }
 #endif