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-x86/syscalls/getrandom.S b/libc/arch-x86/syscalls/getrandom.S
new file mode 100644
index 0000000..2e8ebc9
--- /dev/null
+++ b/libc/arch-x86/syscalls/getrandom.S
@@ -0,0 +1,39 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(getrandom)
+ pushl %ebx
+ .cfi_def_cfa_offset 8
+ .cfi_rel_offset ebx, 0
+ pushl %ecx
+ .cfi_adjust_cfa_offset 4
+ .cfi_rel_offset ecx, 0
+ pushl %edx
+ .cfi_adjust_cfa_offset 4
+ .cfi_rel_offset edx, 0
+
+ call __kernel_syscall
+ pushl %eax
+ .cfi_adjust_cfa_offset 4
+ .cfi_rel_offset eax, 0
+
+ mov 20(%esp), %ebx
+ mov 24(%esp), %ecx
+ mov 28(%esp), %edx
+ movl $__NR_getrandom, %eax
+ call *(%esp)
+ addl $4, %esp
+
+ cmpl $-MAX_ERRNO, %eax
+ jb 1f
+ negl %eax
+ pushl %eax
+ call __set_errno_internal
+ addl $4, %esp
+1:
+ popl %edx
+ popl %ecx
+ popl %ebx
+ ret
+END(getrandom)