Add <sys/random.h>.
iOS 10 has <sys/random.h> with getentropy, glibc >= 2.25 has
<sys/random.h> with getentropy and getrandom. (glibc also pollutes
<unistd.h>, but that seems like a bad idea.)
Also, all supported devices now have kernels with the getrandom system
call.
We've had these available internally for a while, but it seems like the
time is ripe to expose them.
Bug: http://b/67014255
Test: ran tests
Change-Id: I76dde1e3a2d0bc82777eea437ac193f96964f138
diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index a1d1af0..f8be0b0 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -353,3 +353,6 @@
# vdso stuff.
int __clock_gettime:clock_gettime(clockid_t, timespec*) all
int __gettimeofday:gettimeofday(timeval*, timezone*) all
+
+# <sys/random.h>
+ssize_t getrandom(void*, size_t, unsigned) all