On Wed, 2022-07-13 at 01:27 +0200, Jason A. Donenfeld wrote: > > +++ b/arch/um/include/shared/os.h > @@ -11,6 +11,12 @@ > #include <irq_user.h> > #include <longjmp.h> > #include <mm_id.h> > +/* This is to get size_t */ > +#ifndef __UM_HOST__ > +#include <linux/types.h> > +#else > +#include <stddef.h> > +#endif > > #define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR)) > > @@ -243,6 +249,7 @@ extern void stack_protections(unsigned long address); > extern int raw(int fd); > extern void setup_machinename(char *machine_out); > extern void setup_hostinfo(char *buf, int len); > +extern ssize_t os_getrandom(void *buf, size_t len, unsigned int flags); For me, this doesn't compile, and per the man-page on my system, ssize_t requires <sys/types.h>, not <stddef.h>? johannes