1 files changed, 35 insertions, 0 deletions
diff --git a/libcoopgamma_get_pid_file.c b/libcoopgamma_get_pid_file.c
new file mode 100644
index 0000000..45afd1b
--- /dev/null
+++ b/libcoopgamma_get_pid_file.c
@@ -0,0 +1,35 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+/**
+ * Get the PID file of the coopgamma server
+ * 
+ * SIGCHLD must not be ignored or blocked
+ * 
+ * @param   method   The adjustment method, `NULL` for automatic
+ * @param   site     The site, `NULL` for automatic
+ * @return           The pathname of the server's PID file, `NULL` on error
+ *                   or if there server does not use PID files. The later
+ *                   case is detected by checking that `errno` is set to 0.
+ */
+char *
+libcoopgamma_get_pid_file(const char *restrict method, const char *restrict site)
+{
+	char *path;
+	size_t n;
+
+	path = libcoopgamma_get_socket_file(method, site);
+	if (!path)
+		return NULL;
+
+	n = strlen(path);
+	if (n < 7U || strcmp(&path[n - 7U], ".socket")) {
+		free(path);
+		errno = EBADMSG;
+		return NULL;
+	}
+
+	stpcpy(&path[n - 7U], ".pid");
+	return path;
+}