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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
/// Raise soft file descriptor limit to hard file descriptor limit./// This is the difference between `ulimit -n` and `ulimit -n -H`.pub fn raise_fd_limit() {  #[cfg(unix)]  unsafe {    let mut limits = libc::rlimit {      rlim_cur: 0,      rlim_max: 0,    };
    if 0 != libc::getrlimit(libc::RLIMIT_NOFILE, &mut limits) {      return;    }
    if limits.rlim_cur == libc::RLIM_INFINITY {      return;    }
    // No hard limit? Do a binary search for the effective soft limit.    if limits.rlim_max == libc::RLIM_INFINITY {      let mut min = limits.rlim_cur;      let mut max = 1 << 20;
      while min + 1 < max {        limits.rlim_cur = min + (max - min) / 2;        match libc::setrlimit(libc::RLIMIT_NOFILE, &limits) {          0 => min = limits.rlim_cur,          _ => max = limits.rlim_cur,        }      }
      return;    }
    // Raise the soft limit to the hard limit.    if limits.rlim_cur < limits.rlim_max {      limits.rlim_cur = limits.rlim_max;      libc::setrlimit(libc::RLIMIT_NOFILE, &limits);    }  }}