Merge branch 'master' into debian

1 files changed, 23 insertions, 0 deletions

diff --git a/src/logger/logger.cpp b/src/logger/logger.cpp
index 92a3d9b..482cb18 100644
--- a/src/logger/logger.cpp
+++ b/src/logger/logger.cpp
@@ -1,12 +1,35 @@
 #include <logger/logger.hpp>
 #include <config/config.hpp>
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
 Logger::Logger(const int log_level):
   log_level(log_level),
   stream(std::cout.rdbuf()),
   null_buffer{},
   null_stream{&null_buffer}
 {
+#ifdef SYSTEMD_FOUND
+  if (!this->use_stdout())
+    return;
+
+  // See https://www.freedesktop.org/software/systemd/man/systemd.exec.html#%24JOURNAL_STREAM
+  const char* journal_stream = ::getenv("JOURNAL_STREAM");
+  if (journal_stream == nullptr)
+    return;
+
+  struct stat s{};
+  const int res = ::fstat(STDOUT_FILENO, &s);
+  if (res == -1)
+    return;
+
+  const auto stdout_stream = std::to_string(s.st_dev) + ":" + std::to_string(s.st_ino);
+
+  if (stdout_stream == journal_stream)
+    this->use_systemd = true;
+#endif
 }
 
 Logger::Logger(const int log_level, const std::string& log_file):