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/arch-mips64/syscalls/getrandom.S b/libc/arch-mips64/syscalls/getrandom.S
new file mode 100644
index 0000000..3c5b467
--- /dev/null
+++ b/libc/arch-mips64/syscalls/getrandom.S
@@ -0,0 +1,25 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(getrandom)
+ .set push
+ .set noreorder
+ li v0, __NR_getrandom
+ syscall
+ bnez a3, 1f
+ move a0, v0
+ j ra
+ nop
+1:
+ move t0, ra
+ bal 2f
+ nop
+2:
+ .cpsetup ra, t1, 2b
+ LA t9,__set_errno_internal
+ .cpreturn
+ j t9
+ move ra, t0
+ .set pop
+END(getrandom)