Initial reorg.

This is largely the same as #305, but updated for the current tree.

crates/wasi-common/src/sys/unix/bsd/mod.rs

@@ -0,0 +1,82 @@
+pub(crate) mod hostcalls_impl;
+pub(crate) mod osfile;
+
+pub(crate) mod fdentry_impl {
+    use crate::{sys::host_impl, Result};
+    use std::os::unix::prelude::AsRawFd;
+
+    pub(crate) unsafe fn isatty(fd: &impl AsRawFd) -> Result<bool> {
+        let res = libc::isatty(fd.as_raw_fd());
+        if res == 1 {
+            // isatty() returns 1 if fd is an open file descriptor referring to a terminal...
+            Ok(true)
+        } else {
+            // ... otherwise 0 is returned, and errno is set to indicate the error.
+            match nix::errno::Errno::last() {
+                nix::errno::Errno::ENOTTY => Ok(false),
+                x => Err(host_impl::errno_from_nix(x)),
+            }
+        }
+    }
+}
+
+pub(crate) mod host_impl {
+    use super::super::host_impl::dirent_filetype_from_host;
+    use crate::{wasi, Result};
+
+    pub(crate) const O_RSYNC: nix::fcntl::OFlag = nix::fcntl::OFlag::O_SYNC;
+
+    pub(crate) fn dirent_from_host(
+        host_entry: &nix::libc::dirent,
+    ) -> Result<wasi::__wasi_dirent_t> {
+        let mut entry = unsafe { std::mem::zeroed::<wasi::__wasi_dirent_t>() };
+        let d_type = dirent_filetype_from_host(host_entry)?;
+        entry.d_ino = host_entry.d_ino;
+        entry.d_next = host_entry.d_seekoff;
+        entry.d_namlen = u32::from(host_entry.d_namlen);
+        entry.d_type = d_type;
+        Ok(entry)
+    }
+}
+
+pub(crate) mod fs_helpers {
+    use cfg_if::cfg_if;
+
+    pub(crate) fn utime_now() -> libc::c_long {
+        cfg_if! {
+            if #[cfg(any(
+                    target_os = "macos",
+                    target_os = "freebsd",
+                    target_os = "ios",
+                    target_os = "dragonfly"
+            ))] {
+                -1
+            } else if #[cfg(target_os = "openbsd")] {
+                // https://github.com/openbsd/src/blob/master/sys/sys/stat.h#L187
+                -2
+            } else if #[cfg(target_os = "netbsd" )] {
+                // http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/sys/stat.h?rev=1.69&content-type=text/x-cvsweb-markup&only_with_tag=MAIN
+                1_073_741_823
+            }
+        }
+    }
+
+    pub(crate) fn utime_omit() -> libc::c_long {
+        cfg_if! {
+            if #[cfg(any(
+                    target_os = "macos",
+                    target_os = "freebsd",
+                    target_os = "ios",
+                    target_os = "dragonfly"
+            ))] {
+                -2
+            } else if #[cfg(target_os = "openbsd")] {
+                // https://github.com/openbsd/src/blob/master/sys/sys/stat.h#L187
+                -1
+            } else if #[cfg(target_os = "netbsd")] {
+                // http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/sys/stat.h?rev=1.69&content-type=text/x-cvsweb-markup&only_with_tag=MAIN
+                1_073_741_822
+            }
+        }
+    }
+}