diff options
| author | Lennart Poettering <lennart@poettering.net> | 2014-10-31 11:58:25 -0400 |
|---|---|---|
| committer | Anthony G. Basile <blueness@gentoo.org> | 2014-10-31 11:58:25 -0400 |
| commit | ea79c9cdf08072304aa6e464629cdd4b96d183a6 (patch) | |
| tree | cd6fa54f52b44bfce67645440c210e422bc5fa8b /src/shared/missing.h | |
| parent | fb45281a7a8147e05616a65333094ea744029230 (diff) | |
util: make use of the new getrandom() syscall if it is available when needing entropy
Doesn't require an fd, and could be a bit faster, so let's make use of
it, if it is available.
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
Diffstat (limited to 'src/shared/missing.h')
| -rw-r--r-- | src/shared/missing.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/shared/missing.h b/src/shared/missing.h index 572e17117a..50f0d56c4a 100644 --- a/src/shared/missing.h +++ b/src/shared/missing.h @@ -42,6 +42,21 @@ /* If RLIMIT_RTTIME is not defined, then we cannot use RLIMIT_NLIMITS as is */ #define _RLIMIT_MAX (RLIMIT_RTTIME+1 > RLIMIT_NLIMITS ? RLIMIT_RTTIME+1 : RLIMIT_NLIMITS) +#ifndef __NR_getrandom +# if defined __x86_64__ +# define __NR_getrandom 278 +# else +# warning "__NR_getrandom unknown for your architecture" +# define __NR_getrandom 0xffffffff +# endif +#endif + +#if !HAVE_DECL_GETRANDOM +static inline int getrandom(void *buffer, size_t count, unsigned flags) { + return syscall(__NR_getrandom, buffer, count, flags); +} +#endif + #ifndef BTRFS_IOCTL_MAGIC #define BTRFS_IOCTL_MAGIC 0x94 #endif |