+/*
+ * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
+ *
+ * wrapper around bootid read. Using KALLSYMS to get its address when
+ * available, else we need to have a kernel that exports this function to GPL
+ * modules.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
+ */
+
+/* boot_id depends on sysctl */
+#if defined(CONFIG_SYSCTL)
+
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
+#include "random.h"
+
+/*
+ * Returns string boot id.
+ */
+int wrapper_get_bootid(char *bootid)
+{
+ struct file *file;
+ int ret;
+ ssize_t len;
+ mm_segment_t old_fs;
+
+ file = filp_open("/proc/sys/kernel/random/boot_id", O_RDONLY, 0);
+ if (IS_ERR(file))
+ return PTR_ERR(file);
+
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+
+ if (!file->f_op || !file->f_op->read) {
+ ret = -EINVAL;
+ goto end;
+ }
+
+ len = file->f_op->read(file, bootid, BOOT_ID_LEN - 1, &file->f_pos);
+ if (len != BOOT_ID_LEN - 1) {
+ ret = -EINVAL;
+ goto end;
+ }
+
+ bootid[BOOT_ID_LEN - 1] = '\0';
+ ret = 0;
+end:
+ set_fs(old_fs);
+ filp_close(file, current->files);
+ return ret;
+}
+
+#else
+
+int wrapper_get_bootid(char *bootid)
+{
+ return -ENOSYS;
+}
+
+#endif