Function linux_syscalls::syscall3_readonly

pub unsafe fn syscall3_readonly(
    sysno: Sysno,
    arg0: usize,
    arg1: usize,
    arg2: usize
) -> Result<usize, Errno>

Make a raw system call with 3 arguments. Like the non _readonly version but you declare that syscall does not mutate any memory.

Returns a Result<usize, Errno>.

Safety

A system call is unsafe by definition. It’s the caller’s responsibility to ensure safety.