diff options
author | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2015-07-07 06:26:06 +0000 |
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committer | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2015-07-07 06:26:06 +0000 |
commit | 5d69b8ae32c94f5b284c171651ed2ab736d23dcb (patch) | |
tree | 3d73b4fdfc35dd9fb159c093ca9a38ddf0120c22 /random.c | |
parent | 84880c2aad5895f026150b033e12a530f614f549 (diff) | |
download | ruby-5d69b8ae32c94f5b284c171651ed2ab736d23dcb.tar.gz |
random.c: try getrandom
* random.c (fill_random_bytes_syscall): try getrandom system call
on Linux if supported by the kernel.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51182 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'random.c')
-rw-r--r-- | random.c | 24 |
1 files changed, 23 insertions, 1 deletions
@@ -77,6 +77,12 @@ The original copyright notice follows. #include <sys/time.h> #endif +#ifdef HAVE_SYSCALL_H +#include <syscall.h> +#elif defined HAVE_SYS_SYSCALL_H +#include <sys/syscall.h> +#endif + #ifdef _WIN32 # if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0400 # undef _WIN32_WINNT @@ -84,8 +90,8 @@ The original copyright notice follows. # undef __WINCRYPT_H__ # endif #include <wincrypt.h> -#include "ruby_atomic.h" #endif +#include "ruby_atomic.h" typedef int int_must_be_32bit_at_least[sizeof(int) * CHAR_BIT < 32 ? -1 : 1]; @@ -509,6 +515,22 @@ fill_random_bytes_syscall(void *seed, size_t size) CryptGenRandom(prov, size, seed); return 0; } +#elif defined __linux__ && defined SYS_getrandom +static int +fill_random_bytes_syscall(void *seed, size_t size) +{ + static rb_atomic_t try_syscall = 1; + if (try_syscall) { + errno = 0; + ret = syscall(SYS_getrandom, seed, size, 0) + if (errno == ENOSYS) { + try_syscall = 0; + return -1; + } + if ((size_t)ret == size) return 0; + } + return 0; +} #else # define fill_random_bytes_syscall(seed, size) -1 #endif |