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author | glass <glass@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2019-02-10 08:21:33 +0000 |
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committer | glass <glass@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2019-02-10 08:21:33 +0000 |
commit | 1a8583de72e12e139e9c7fbcfc026c2cbf410519 (patch) | |
tree | a1f5bedcb9eb706643e71cd49b092bdbb68a9f22 /random.c | |
parent | b1cb15c4a42575eb8ceb1c89256f37c662e20172 (diff) |
random.c: use getrandom() if available.
getrandom() is supported by glibc 2.25 or later.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67043 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'random.c')
-rw-r--r-- | random.c | 26 |
1 files changed, 26 insertions, 0 deletions
@@ -390,6 +390,32 @@ fill_random_bytes_syscall(void *seed, size_t size, int unused) CryptGenRandom(prov, size, seed); return 0; } +#elif defined HAVE_GETRANDOM +#include <sys/random.h> + +static int +fill_random_bytes_syscall(void *seed, size_t size, int need_secure) +{ + static rb_atomic_t try_syscall = 1; + if (try_syscall) { + ssize_t ret; + size_t offset = 0; + int flags = 0; + if (!need_secure) + flags = GRND_NONBLOCK; + do { + errno = 0; + ret = getrandom(((char*)seed) + offset, size - offset, flags); + if (ret == -1) { + ATOMIC_SET(try_syscall, 0); + return -1; + } + offset += (size_t)ret; + } while(offset < size); + return 0; + } + return -1; +} #elif defined __linux__ && defined __NR_getrandom #include <linux/random.h> |