1 files changed, 60 insertions, 0 deletions
diff --git a/src/knot/common/process.h b/src/knot/common/process.h
new file mode 100644
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--- /dev/null
+++ b/src/knot/common/process.h
@@ -0,0 +1,60 @@
+/*  Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/*!
+ * \brief Functions for POSIX process handling.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <unistd.h>
+
+/*!
+ * \brief Check if PID file exists and create it if possible.
+ *
+ * \retval 0 if failed.
+ * \retval Current PID.
+ */
+unsigned long pid_check_and_create(void);
+
+/*!
+ * \brief Remove PID file.
+ *
+ * \warning PID file content won't be checked.
+ */
+void pid_cleanup(void);
+
+/*!
+ * \brief Return true if the PID is running.
+ *
+ * \param pid Process ID.
+ *
+ * \retval 1 if running.
+ * \retval 0 if not running (or error).
+ */
+bool pid_running(pid_t pid);
+
+/*!
+ * \brief Update process privileges to new UID/GID.
+ *
+ * \param uid New user ID.
+ * \param gid New group ID.
+ *
+ * \retval KNOT_EOK on success.
+ * \retval KNOT_ERROR if UID or GID change failed.
+ */
+int proc_update_privileges(int uid, int gid);