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fe75ee0c | 1 | /* Hurdish implementation of getrandom |
2b778ceb | 2 | Copyright (C) 2016-2021 Free Software Foundation, Inc. |
fe75ee0c AE |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <sys/random.h> | |
20 | #include <fcntl.h> | |
21 | #include <unistd.h> | |
22 | #include <not-cancel.h> | |
23 | ||
24 | /* Write up to LENGTH bytes of randomness starting at BUFFER. | |
25 | Return the number of bytes written, or -1 on error. */ | |
26 | ssize_t | |
8eaf34ed | 27 | __getrandom (void *buffer, size_t length, unsigned int flags) |
fe75ee0c AE |
28 | { |
29 | const char *random_source = "/dev/urandom"; | |
a45244ce | 30 | int open_flags = O_RDONLY | O_CLOEXEC; |
fe75ee0c AE |
31 | size_t amount_read; |
32 | int fd; | |
33 | ||
34 | if (flags & GRND_RANDOM) | |
35 | random_source = "/dev/random"; | |
36 | ||
a45244ce JC |
37 | if (flags & GRND_NONBLOCK) |
38 | open_flags |= O_NONBLOCK; | |
39 | ||
40 | fd = __open_nocancel(random_source, open_flags); | |
fe75ee0c AE |
41 | if (fd == -1) |
42 | return -1; | |
43 | ||
44 | amount_read = __read_nocancel(fd, buffer, length); | |
45 | __close_nocancel_nostatus(fd); | |
46 | return amount_read; | |
47 | } | |
8eaf34ed ST |
48 | |
49 | libc_hidden_def (__getrandom) | |
50 | weak_alias (__getrandom, getrandom) |