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- <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 218</span><hr><div class="refentry"><a name="sd_journal_get_fd"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_journal_get_fd, sd_journal_get_events, sd_journal_get_timeout, sd_journal_process, sd_journal_wait, sd_journal_reliable_fd, SD_JOURNAL_NOP, SD_JOURNAL_APPEND, SD_JOURNAL_INVALIDATE — Journal change notification
- interface</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <systemd/sd-journal.h></pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_get_fd</b>(</code></td><td>sd_journal *<var class="pdparam">j</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_get_events</b>(</code></td><td>sd_journal *<var class="pdparam">j</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_get_timeout</b>(</code></td><td>sd_journal *<var class="pdparam">j</var>, </td></tr><tr><td> </td><td>uint64_t *<var class="pdparam">timeout_usec</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_process</b>(</code></td><td>sd_journal *<var class="pdparam">j</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_wait</b>(</code></td><td>sd_journal *<var class="pdparam">j</var>, </td></tr><tr><td> </td><td>uint64_t <var class="pdparam">timeout_usec</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_reliable_fd</b>(</code></td><td>sd_journal *<var class="pdparam">j</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm139870240160032"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="function">sd_journal_get_fd()</code> returns
- a file descriptor that may be asynchronously polled in
- an external event loop and is signaled as soon as the
- journal changes, because new entries or files were
- added, rotation took place, or files have been
- deleted, and similar. The file descriptor is suitable
- for usage in
- <a href="http://man7.org/linux/man-pages/man2/poll.2.html"><span class="citerefentry"><span class="refentrytitle">poll</span>(2)</span></a>. Use
- <code class="function">sd_journal_get_events()</code> for an
- events mask to watch for. The call takes one argument:
- the journal context object. Note that not all file
- systems are capable of generating the necessary events
- for wakeups from this file descriptor for changes to
- be noticed immediately. In particular network files
- systems do not generate suitable file change events in
- all cases. Cases like this can be detected with
- <code class="function">sd_journal_reliable_fd()</code>,
- below. <code class="function">sd_journal_get_timeout()</code>
- will ensure in these cases that wake-ups happen
- frequently enough for changes to be noticed, although
- with a certain latency.</p><p><code class="function">sd_journal_get_events()</code>
- will return the <code class="function">poll()</code> mask to
- wait for. This function will return a combination of
- <code class="constant">POLLIN</code> and
- <code class="constant">POLLOUT</code> and similar to fill into
- the "<code class="literal">.events</code>" field of
- <code class="varname">struct pollfd</code>.</p><p><code class="function">sd_journal_get_timeout()</code>
- will return a timeout value for usage in
- <code class="function">poll()</code>. This returns a value in
- microseconds since the epoch of
- <code class="constant">CLOCK_MONOTONIC</code> for timing out
- <code class="function">poll()</code> in
- <code class="varname">timeout_usec</code>. See
- <a href="http://man7.org/linux/man-pages/man2/clock_gettime.2.html"><span class="citerefentry"><span class="refentrytitle">clock_gettime</span>(2)</span></a>
- for details about
- <code class="constant">CLOCK_MONOTONIC</code>. If there is no
- timeout to wait for, this will fill in
- <code class="constant">(uint64_t) -1</code> instead. Note that
- <code class="function">poll()</code> takes a relative timeout
- in milliseconds rather than an absolute timeout in
- microseconds. To convert the absolute 'us' timeout
- into relative 'ms', use code like the
- following:</p><pre class="programlisting">uint64_t t;
+ <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 219</span><hr><div class="refentry"><a name="sd_journal_get_fd"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_journal_get_fd, sd_journal_get_events, sd_journal_get_timeout, sd_journal_process, sd_journal_wait, sd_journal_reliable_fd, SD_JOURNAL_NOP, SD_JOURNAL_APPEND, SD_JOURNAL_INVALIDATE — Journal change notification
+ interface</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <systemd/sd-journal.h></pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_get_fd</b>(</code></td><td>sd_journal *<var class="pdparam">j</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_get_events</b>(</code></td><td>sd_journal *<var class="pdparam">j</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_get_timeout</b>(</code></td><td>sd_journal *<var class="pdparam">j</var>, </td></tr><tr><td> </td><td>uint64_t *<var class="pdparam">timeout_usec</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_process</b>(</code></td><td>sd_journal *<var class="pdparam">j</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_wait</b>(</code></td><td>sd_journal *<var class="pdparam">j</var>, </td></tr><tr><td> </td><td>uint64_t <var class="pdparam">timeout_usec</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_journal_reliable_fd</b>(</code></td><td>sd_journal *<var class="pdparam">j</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm140121381493808"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="function">sd_journal_get_fd()</code> returns a file
+ descriptor that may be asynchronously polled in an external event
+ loop and is signaled as soon as the journal changes, because new
+ entries or files were added, rotation took place, or files have
+ been deleted, and similar. The file descriptor is suitable for
+ usage in
+ <a href="http://man7.org/linux/man-pages/man2/poll.2.html"><span class="citerefentry"><span class="refentrytitle">poll</span>(2)</span></a>.
+ Use <code class="function">sd_journal_get_events()</code> for an events
+ mask to watch for. The call takes one argument: the journal
+ context object. Note that not all file systems are capable of
+ generating the necessary events for wakeups from this file
+ descriptor for changes to be noticed immediately. In particular
+ network files systems do not generate suitable file change events
+ in all cases. Cases like this can be detected with
+ <code class="function">sd_journal_reliable_fd()</code>, below.
+ <code class="function">sd_journal_get_timeout()</code> will ensure in these
+ cases that wake-ups happen frequently enough for changes to be
+ noticed, although with a certain latency.</p><p><code class="function">sd_journal_get_events()</code> will return the
+ <code class="function">poll()</code> mask to wait for. This function will
+ return a combination of <code class="constant">POLLIN</code> and
+ <code class="constant">POLLOUT</code> and similar to fill into the
+ "<code class="literal">.events</code>" field of <code class="varname">struct
+ pollfd</code>.</p><p><code class="function">sd_journal_get_timeout()</code> will return a
+ timeout value for usage in <code class="function">poll()</code>. This
+ returns a value in microseconds since the epoch of
+ <code class="constant">CLOCK_MONOTONIC</code> for timing out
+ <code class="function">poll()</code> in <code class="varname">timeout_usec</code>.
+ See
+ <a href="http://man7.org/linux/man-pages/man2/clock_gettime.2.html"><span class="citerefentry"><span class="refentrytitle">clock_gettime</span>(2)</span></a>
+ for details about <code class="constant">CLOCK_MONOTONIC</code>. If there
+ is no timeout to wait for, this will fill in <code class="constant">(uint64_t)
+ -1</code> instead. Note that <code class="function">poll()</code> takes
+ a relative timeout in milliseconds rather than an absolute timeout
+ in microseconds. To convert the absolute 'us' timeout into
+ relative 'ms', use code like the following:</p><pre class="programlisting">uint64_t t;
int msec;
sd_journal_get_timeout(m, &t);
if (t == (uint64_t) -1)
- msec = -1;
+ msec = -1;
else {
- struct timespec ts;
- uint64_t n;
- clock_getttime(CLOCK_MONOTONIC, &ts);
- n = (uint64_t) ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
- msec = t > n ? (int) ((t - n + 999) / 1000) : 0;
-}</pre><p>The code above does not do any error checking
- for brevity's sake. The calculated <code class="varname">msec</code>
- integer can be passed directly as
- <code class="function">poll()</code>'s timeout
- parameter.</p><p>After each <code class="function">poll()</code> wake-up
- <code class="function">sd_journal_process()</code> needs to be
- called to process events. This call will also indicate
- what kind of change has been detected (see below; note
- that spurious wake-ups are possible).</p><p>A synchronous alternative for using
- <code class="function">sd_journal_get_fd()</code>,
- <code class="function">sd_journal_get_events()</code>,
- <code class="function">sd_journal_get_timeout()</code> and
- <code class="function">sd_journal_process()</code> is
- <code class="function">sd_journal_wait()</code>. It will
- synchronously wait until the journal gets changed. The
- maximum time this call sleeps may be controlled with
- the <em class="parameter"><code>timeout_usec</code></em>
- parameter. Pass <code class="constant">(uint64_t) -1</code> to
- wait indefinitely. Internally this call simply
- combines <code class="function">sd_journal_get_fd()</code>,
- <code class="function">sd_journal_get_events()</code>,
- <code class="function">sd_journal_get_timeout()</code>,
- <code class="function">poll()</code> and
- <code class="function">sd_journal_process()</code> into
- one.</p><p><code class="function">sd_journal_reliable_fd()</code>
- may be used to check whether the wakeup events from
- the file descriptor returned by
- <code class="function">sd_journal_get_fd()</code> are known to
- be immediately triggered. On certain file systems
- where file change events from the OS are not available
- (such as NFS) changes need to be polled for
- repeatedly, and hence are detected only with a certain
- latency. This call will return a positive value if the
- journal changes are detected immediately and zero when
- they need to be polled for and hence might be noticed
- only with a certain latency. Note that there's usually
- no need to invoke this function directly as
- <code class="function">sd_journal_get_timeout()</code> on these
- file systems will ask for timeouts explicitly
- anyway.</p></div><div class="refsect1"><a name="idm139870240119632"></a><h2 id="Return Value">Return Value<a class="headerlink" title="Permalink to this headline" href="#Return%20Value">¶</a></h2><p><code class="function">sd_journal_get_fd()</code> returns
- a valid file descriptor on success or a negative
- errno-style error code.</p><p><code class="function">sd_journal_get_events()</code>
- returns a combination of <code class="constant">POLLIN</code>,
- <code class="constant">POLLOUT</code> and suchlike on success or
- a negative errno-style error code.</p><p><code class="function">sd_journal_reliable_fd()</code>
- returns a positive integer if the file descriptor
- returned by <code class="function">sd_journal_get_fd()</code>
- will generate wake-ups immediately for all journal
- changes. Returns 0 if there might be a latency
- involved.</p><p><code class="function">sd_journal_process()</code> and
- <code class="function">sd_journal_wait()</code> return one of
- <code class="constant">SD_JOURNAL_NOP</code>,
- <code class="constant">SD_JOURNAL_APPEND</code> or
- <code class="constant">SD_JOURNAL_INVALIDATE</code> on success or
- a negative errno-style error code. If
- <code class="constant">SD_JOURNAL_NOP</code> is returned, the
- journal did not change since the last invocation. If
- <code class="constant">SD_JOURNAL_APPEND</code> is returned, new
- entries have been appended to the end of the
- journal. If <code class="constant">SD_JOURNAL_INVALIDATE</code>,
- journal files were added or removed (possibly due to
- rotation). In the latter event, live-view UIs should
- probably refresh their entire display, while in the
- case of <code class="constant">SD_JOURNAL_APPEND</code>, it is
- sufficient to simply continue reading at the previous
- end of the journal.</p></div><div class="refsect1"><a name="idm139870235144576"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p>The <code class="function">sd_journal_get_fd()</code>,
- <code class="function">sd_journal_get_events()</code>,
- <code class="function">sd_journal_reliable_fd()</code>,
- <code class="function">sd_journal_process()</code> and
- <code class="function">sd_journal_wait()</code> interfaces are
- available as a shared library, which can be compiled and
- linked to with the
- <code class="constant">libsystemd</code> <a href="http://linux.die.net/man/1/pkg-config"><span class="citerefentry"><span class="refentrytitle">pkg-config</span>(1)</span></a>
- file.</p></div><div class="refsect1"><a name="idm139870235138752"></a><h2 id="Examples">Examples<a class="headerlink" title="Permalink to this headline" href="#Examples">¶</a></h2><p>Iterating through the journal, in a live view tracking all changes:</p><pre class="programlisting">#include <stdio.h>
+ struct timespec ts;
+ uint64_t n;
+ clock_getttime(CLOCK_MONOTONIC, &ts);
+ n = (uint64_t) ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
+ msec = t > n ? (int) ((t - n + 999) / 1000) : 0;
+}</pre><p>The code above does not do any error checking for brevity's
+ sake. The calculated <code class="varname">msec</code> integer can be passed
+ directly as <code class="function">poll()</code>'s timeout
+ parameter.</p><p>After each <code class="function">poll()</code> wake-up
+ <code class="function">sd_journal_process()</code> needs to be called to
+ process events. This call will also indicate what kind of change
+ has been detected (see below; note that spurious wake-ups are
+ possible).</p><p>A synchronous alternative for using
+ <code class="function">sd_journal_get_fd()</code>,
+ <code class="function">sd_journal_get_events()</code>,
+ <code class="function">sd_journal_get_timeout()</code> and
+ <code class="function">sd_journal_process()</code> is
+ <code class="function">sd_journal_wait()</code>. It will synchronously wait
+ until the journal gets changed. The maximum time this call sleeps
+ may be controlled with the <em class="parameter"><code>timeout_usec</code></em>
+ parameter. Pass <code class="constant">(uint64_t) -1</code> to wait
+ indefinitely. Internally this call simply combines
+ <code class="function">sd_journal_get_fd()</code>,
+ <code class="function">sd_journal_get_events()</code>,
+ <code class="function">sd_journal_get_timeout()</code>,
+ <code class="function">poll()</code> and
+ <code class="function">sd_journal_process()</code> into one.</p><p><code class="function">sd_journal_reliable_fd()</code> may be used to
+ check whether the wakeup events from the file descriptor returned
+ by <code class="function">sd_journal_get_fd()</code> are known to be
+ immediately triggered. On certain file systems where file change
+ events from the OS are not available (such as NFS) changes need to
+ be polled for repeatedly, and hence are detected only with a
+ certain latency. This call will return a positive value if the
+ journal changes are detected immediately and zero when they need
+ to be polled for and hence might be noticed only with a certain
+ latency. Note that there's usually no need to invoke this function
+ directly as <code class="function">sd_journal_get_timeout()</code> on these
+ file systems will ask for timeouts explicitly anyway.</p></div><div class="refsect1"><a name="idm140121381454848"></a><h2 id="Return Value">Return Value<a class="headerlink" title="Permalink to this headline" href="#Return%20Value">¶</a></h2><p><code class="function">sd_journal_get_fd()</code> returns a valid
+ file descriptor on success or a negative errno-style error
+ code.</p><p><code class="function">sd_journal_get_events()</code> returns a
+ combination of <code class="constant">POLLIN</code>,
+ <code class="constant">POLLOUT</code> and suchlike on success or a negative
+ errno-style error code.</p><p><code class="function">sd_journal_reliable_fd()</code> returns a
+ positive integer if the file descriptor returned by
+ <code class="function">sd_journal_get_fd()</code> will generate wake-ups
+ immediately for all journal changes. Returns 0 if there might be a
+ latency involved.</p><p><code class="function">sd_journal_process()</code> and
+ <code class="function">sd_journal_wait()</code> return one of
+ <code class="constant">SD_JOURNAL_NOP</code>,
+ <code class="constant">SD_JOURNAL_APPEND</code> or
+ <code class="constant">SD_JOURNAL_INVALIDATE</code> on success or a
+ negative errno-style error code. If
+ <code class="constant">SD_JOURNAL_NOP</code> is returned, the journal did
+ not change since the last invocation. If
+ <code class="constant">SD_JOURNAL_APPEND</code> is returned, new entries
+ have been appended to the end of the journal. If
+ <code class="constant">SD_JOURNAL_INVALIDATE</code>, journal files were
+ added or removed (possibly due to rotation). In the latter event,
+ live-view UIs should probably refresh their entire display, while
+ in the case of <code class="constant">SD_JOURNAL_APPEND</code>, it is
+ sufficient to simply continue reading at the previous end of the
+ journal.</p></div><div class="refsect1"><a name="idm140121381556448"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p>The <code class="function">sd_journal_get_fd()</code>,
+ <code class="function">sd_journal_get_events()</code>,
+ <code class="function">sd_journal_reliable_fd()</code>,
+ <code class="function">sd_journal_process()</code> and
+ <code class="function">sd_journal_wait()</code> interfaces are available as
+ a shared library, which can be compiled and linked to with the
+ <code class="constant">libsystemd</code> <a href="http://linux.die.net/man/1/pkg-config"><span class="citerefentry"><span class="refentrytitle">pkg-config</span>(1)</span></a>
+ file.</p></div><div class="refsect1"><a name="idm140121376465504"></a><h2 id="Examples">Examples<a class="headerlink" title="Permalink to this headline" href="#Examples">¶</a></h2><p>Iterating through the journal, in a live view tracking all
+ changes:</p><pre class="programlisting">#include <stdio.h>
#include <string.h>
#include <systemd/sd-journal.h>
int main(int argc, char *argv[]) {
- int r;
- sd_journal *j;
- r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY);
- if (r < 0) {
- fprintf(stderr, "Failed to open journal: %s\n", strerror(-r));
- return 1;
- }
- for (;;) {
- const void *d;
- size_t l;
- r = sd_journal_next(j);
- if (r < 0) {
- fprintf(stderr, "Failed to iterate to next entry: %s\n", strerror(-r));
- break;
- }
- if (r == 0) {
- /* Reached the end, let's wait for changes, and try again */
- r = sd_journal_wait(j, (uint64_t) -1);
- if (r < 0) {
- fprintf(stderr, "Failed to wait for changes: %s\n", strerror(-r));
- break;
- }
- continue;
- }
- r = sd_journal_get_data(j, "MESSAGE", &d, &l);
- if (r < 0) {
- fprintf(stderr, "Failed to read message field: %s\n", strerror(-r));
- continue;
- }
- printf("%.*s\n", (int) l, (const char*) d);
- }
- sd_journal_close(j);
- return 0;
+ int r;
+ sd_journal *j;
+ r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY);
+ if (r < 0) {
+ fprintf(stderr, "Failed to open journal: %s\n", strerror(-r));
+ return 1;
+ }
+ for (;;) {
+ const void *d;
+ size_t l;
+ r = sd_journal_next(j);
+ if (r < 0) {
+ fprintf(stderr, "Failed to iterate to next entry: %s\n", strerror(-r));
+ break;
+ }
+ if (r == 0) {
+ /* Reached the end, let's wait for changes, and try again */
+ r = sd_journal_wait(j, (uint64_t) -1);
+ if (r < 0) {
+ fprintf(stderr, "Failed to wait for changes: %s\n", strerror(-r));
+ break;
+ }
+ continue;
+ }
+ r = sd_journal_get_data(j, "MESSAGE", &d, &l);
+ if (r < 0) {
+ fprintf(stderr, "Failed to read message field: %s\n", strerror(-r));
+ continue;
+ }
+ printf("%.*s\n", (int) l, (const char*) d);
+ }
+ sd_journal_close(j);
+ return 0;
}</pre><p>Waiting with <code class="function">poll()</code> (this
- example lacks all error checking for the sake of
- simplicity):</p><pre class="programlisting">#include <sys/poll.h>
+ example lacks all error checking for the sake of
+ simplicity):</p><pre class="programlisting">#include <poll.h>
#include <systemd/sd-journal.h>
int wait_for_changes(sd_journal *j) {
- struct pollfd pollfd;
- int msec;
+ struct pollfd pollfd;
+ int msec;
- sd_journal_get_timeout(m, &t);
- if (t == (uint64_t) -1)
- msec = -1;
- else {
- struct timespec ts;
- uint64_t n;
- clock_getttime(CLOCK_MONOTONIC, &ts);
- n = (uint64_t) ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
- msec = t > n ? (int) ((t - n + 999) / 1000) : 0;
- }
+ sd_journal_get_timeout(m, &t);
+ if (t == (uint64_t) -1)
+ msec = -1;
+ else {
+ struct timespec ts;
+ uint64_t n;
+ clock_getttime(CLOCK_MONOTONIC, &ts);
+ n = (uint64_t) ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
+ msec = t > n ? (int) ((t - n + 999) / 1000) : 0;
+ }
- pollfd.fd = sd_journal_get_fd(j);
- pollfd.events = sd_journal_get_events(j);
- poll(&pollfd, 1, msec);
- return sd_journal_process(j);
-}</pre></div><div class="refsect1"><a name="idm1
39870235132128"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
-
<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
-
<a href="sd-journal.html"><span class="citerefentry"><span class="refentrytitle">sd-journal</span>(3)</span></a>,
-
<a href="sd_journal_open.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_open</span>(3)</span></a>,
-
<a href="sd_journal_next.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_next</span>(3)</span></a>,
-
<a href="http://man7.org/linux/man-pages/man2/poll.2.html"><span class="citerefentry"><span class="refentrytitle">poll</span>(2)</span></a>,
-
<a href="http://man7.org/linux/man-pages/man2/clock_gettime.2.html"><span class="citerefentry"><span class="refentrytitle">clock_gettime</span>(2)</span></a>
- </p></div></div></body></html>
+ pollfd.fd = sd_journal_get_fd(j);
+ pollfd.events = sd_journal_get_events(j);
+ poll(&pollfd, 1, msec);
+ return sd_journal_process(j);
+}</pre></div><div class="refsect1"><a name="idm1
40121376459680"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
+ <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
+ <a href="sd-journal.html"><span class="citerefentry"><span class="refentrytitle">sd-journal</span>(3)</span></a>,
+ <a href="sd_journal_open.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_open</span>(3)</span></a>,
+ <a href="sd_journal_next.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_next</span>(3)</span></a>,
+ <a href="http://man7.org/linux/man-pages/man2/poll.2.html"><span class="citerefentry"><span class="refentrytitle">poll</span>(2)</span></a>,
+ <a href="http://man7.org/linux/man-pages/man2/clock_gettime.2.html"><span class="citerefentry"><span class="refentrytitle">clock_gettime</span>(2)</span></a>
+ </p></div></div></body></html>
projects / systemd.git / blobdiff