1 files changed, 32 insertions, 0 deletions
diff --git a/ports/linux/guts/lckpwdf.c b/ports/linux/guts/lckpwdf.c
new file mode 100644
index 0000000..b452ec0
--- /dev/null
+++ b/ports/linux/guts/lckpwdf.c
@@ -0,0 +1,32 @@
+/* 
+ * Copyright (c) 2010 Wind River Systems; see
+ * guts/COPYRIGHT for information.
+ *
+ * static int
+ * wrap_lckpwdf(void) {
+ *	int rc = -1;
+ */
+	rc = pseudo_pwd_lck_open();
+	if (rc != -1) {
+		struct flock lck = {
+			.l_type = F_RDLCK,
+			.l_whence = SEEK_SET,
+			.l_start = 0,
+			.l_len = 1
+		};
+		/* I don't really care whether this works. */
+		fcntl(rc, F_SETFD, FD_CLOEXEC);
+		/* Now lock it. */
+		alarm(15); /* magic number from man page */
+		rc = fcntl(rc, F_SETLKW, &lck);
+		alarm(0);
+		if (rc == -1) {
+			int save_errno = errno;
+			pseudo_pwd_lck_close();
+			errno = save_errno;
+		}
+	}
+
+/*	return rc;
+ * }
+ */