Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/man/journal-iterate-wait.c b/man/journal-iterate-wait.c
new file mode 100644
index 0000000..ac4b60b
--- /dev/null
+++ b/man/journal-iterate-wait.c
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: MIT-0 */
+
+#include <errno.h>
+#include <stdio.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) {
+    errno = -r;
+    fprintf(stderr, "Failed to open journal: %m\n");
+    return 1;
+  }
+  for (;;)  {
+    const void *d;
+    size_t l;
+    r = sd_journal_next(j);
+    if (r < 0) {
+      errno = -r;
+      fprintf(stderr, "Failed to iterate to next entry: %m\n");
+      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) {
+        errno = -r;
+        fprintf(stderr, "Failed to wait for changes: %m\n");
+        break;
+      }
+      continue;
+    }
+    r = sd_journal_get_data(j, "MESSAGE", &d, &l);
+    if (r < 0) {
+      errno = -r;
+      fprintf(stderr, "Failed to read message field: %m\n");
+      continue;
+    }
+    printf("%.*s\n", (int) l, (const char*) d);
+  }
+  sd_journal_close(j);
+  return 0;
+}