1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
5 * wrapper around bootid read. Using KALLSYMS to get its address when
6 * available, else we need to have a kernel that exports this function to GPL
9 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
12 #include <linux/errno.h>
13 #include <linux/module.h>
15 /* boot_id depends on sysctl */
16 #if defined(CONFIG_SYSCTL)
18 #include <wrapper/fs.h>
19 #include <linux/file.h>
20 #include <linux/sched.h>
21 #include <linux/uaccess.h>
22 #include <wrapper/random.h>
25 * Returns string boot id.
27 int wrapper_get_bootid(char *bootid
)
33 file
= filp_open("/proc/sys/kernel/random/boot_id", O_RDONLY
, 0);
37 len
= lttng_kernel_read(file
, bootid
, BOOT_ID_LEN
- 1, &file
->f_pos
);
38 if (len
!= BOOT_ID_LEN
- 1) {
43 bootid
[BOOT_ID_LEN
- 1] = '\0';
46 filp_close(file
, current
->files
);
49 EXPORT_SYMBOL_GPL(wrapper_get_bootid
);
53 int wrapper_get_bootid(char *bootid
)
57 EXPORT_SYMBOL_GPL(wrapper_get_bootid
);
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