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prefer builtin arc4random on OS X 10.12+ (using getentropy as the signal)

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Brent Cook 2016-11-06 10:10:10 +01:00 committed by Brent Cook
parent d38ab0a39e
commit d2f5ab1ee8
1 changed files with 9 additions and 1 deletions
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10
m4/check-os-options.m4
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@ -20,7 +20,15 @@ case $host_os in
# weak seed on failure to open /dev/random, based on latest # weak seed on failure to open /dev/random, based on latest
# public source: # public source:
# http://www.opensource.apple.com/source/Libc/Libc-997.90.3/gen/FreeBSD/arc4random.c # http://www.opensource.apple.com/source/Libc/Libc-997.90.3/gen/FreeBSD/arc4random.c
USE_BUILTIN_ARC4RANDOM=yes AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <unistd.h>
#include <sys/random.h>
]], [[
char buf[1]; getentropy(buf, 1);
]])],
[ USE_BUILTIN_ARC4RANDOM=no ],
[ USE_BUILTIN_ARC4RANDOM=yes ]
)
# Not available on iOS # Not available on iOS
AC_CHECK_HEADER([arpa/telnet.h], [], [BUILD_NC=no]) AC_CHECK_HEADER([arpa/telnet.h], [], [BUILD_NC=no])
;; ;;