| //! libc syscalls supporting `rustix::rand`. |
| |
| #[cfg(linux_kernel)] |
| use {crate::backend::c, crate::backend::conv::ret_usize, crate::io, crate::rand::GetRandomFlags}; |
| |
| #[cfg(linux_kernel)] |
| pub(crate) fn getrandom(buf: &mut [u8], flags: GetRandomFlags) -> io::Result<usize> { |
| // `getrandom` wasn't supported in glibc until 2.25. |
| weak_or_syscall! { |
| fn getrandom(buf: *mut c::c_void, buflen: c::size_t, flags: c::c_uint) via SYS_getrandom -> c::ssize_t |
| } |
| |
| unsafe { ret_usize(getrandom(buf.as_mut_ptr().cast(), buf.len(), flags.bits())) } |
| } |
