16 lines
618 B
Rust
16 lines
618 B
Rust
//! libc syscalls supporting `rustix::rand`.
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#[cfg(target_os = "linux")]
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use {super::super::c, super::super::conv::ret_ssize_t, crate::io, crate::rand::GetRandomFlags};
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#[cfg(target_os = "linux")]
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pub(crate) fn getrandom(buf: &mut [u8], flags: GetRandomFlags) -> io::Result<usize> {
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// `getrandom` wasn't supported in glibc until 2.25.
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weak_or_syscall! {
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fn getrandom(buf: *mut c::c_void, buflen: c::size_t, flags: c::c_uint) via SYS_getrandom -> c::ssize_t
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}
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let nread =
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unsafe { ret_ssize_t(getrandom(buf.as_mut_ptr().cast(), buf.len(), flags.bits()))? };
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Ok(nread as usize)
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}
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