Change some OpebBSD cfg attributes to whitelists.

As discussed in #1000 .

Author: thendiscard

src/sys/stat.rs

@@ -209,8 +209,12 @@ pub fn utimes<P: ?Sized + NixPath>(path: &P, atime: &TimeVal, mtime: &TimeVal) -
 /// # References
 ///
 /// [lutimes(2)](http://pubs.opengroup.org/onlinepubs/9699919799/functions/lutimes.html).
-#[cfg(not(any(target_os = "android",
-              target_os = "openbsd")))]
+#[cfg(any(target_os = "linux",
+          target_os = "haiku",
+          target_os = "ios",
+          target_os = "macos",
+          target_os = "freebsd",
+          target_os = "netbsd"))]
 pub fn lutimes<P: ?Sized + NixPath>(path: &P, atime: &TimeVal, mtime: &TimeVal) -> Result<()> {
     let times: [libc::timeval; 2] = [*atime.as_ref(), *mtime.as_ref()];
     let res = path.with_nix_path(|cstr| unsafe {

src/unistd.rs

@@ -760,10 +760,13 @@ pub fn execvpe(filename: &CString, args: &[CString], env: &[CString]) -> Result<
 ///
 /// This function is similar to `execve`, except that the program to be executed
 /// is referenced as a file descriptor instead of a path.
+///
+/// Note for NetBSD and OpenBSD: although rust-lang/libc includes it (under
+/// unix/bsd/netbsdlike/) fexecve is not currently implemented on NetBSD nor on
+/// OpenBSD.
 #[cfg(any(target_os = "android",
-          target_os = "freebsd",
           target_os = "linux",
-          target_os = "netbsd"))]
+          target_os = "freebsd"))]
 #[inline]
 pub fn fexecve(fd: RawFd, args: &[CString], env: &[CString]) -> Result<Void> {
     let args_p = to_exec_array(args);

test/test_stat.rs

@@ -7,10 +7,14 @@ use std::time::{Duration, UNIX_EPOCH};
 use libc::{S_IFMT, S_IFLNK};
 
 use nix::fcntl;
-#[cfg(not(any(target_os = "openbsd")))]
-use nix::sys::stat::{self, fchmod, fchmodat, futimens, lutimes, stat, utimes, utimensat};
-#[cfg(any(target_os = "openbsd"))]
 use nix::sys::stat::{self, fchmod, fchmodat, futimens, stat, utimes, utimensat};
+#[cfg(any(target_os = "linux",
+          target_os = "haiku",
+          target_os = "ios",
+          target_os = "macos",
+          target_os = "freebsd",
+          target_os = "netbsd"))]
+use nix::sys::stat::{lutimes};
 use nix::sys::stat::{Mode, FchmodatFlags, UtimensatFlags};
 
 #[cfg(not(any(target_os = "netbsd")))]
@@ -199,7 +203,12 @@ fn test_utimes() {
 }
 
 #[test]
-#[cfg(not(any(target_os = "openbsd")))]
+#[cfg(any(target_os = "linux",
+          target_os = "haiku",
+          target_os = "ios",
+          target_os = "macos",
+          target_os = "freebsd",
+          target_os = "netbsd"))]
 fn test_lutimes() {
     let tempdir = tempfile::tempdir().unwrap();
     let target = tempdir.path().join("target");

test/test_unistd.rs

@@ -240,6 +240,10 @@ cfg_if!{
                         target_os = "openbsd"))] {
         execve_test_factory!(test_execve, execve, &CString::new("/bin/sh").unwrap());
         // No fexecve() on DragonFly, ios, macos, NetBSD, OpenBSD.
+        //
+        // Note for NetBSD and OpenBSD: although rust-lang/libc includes it
+        // (under unix/bsd/netbsdlike/) fexecve is not currently implemented on
+        // NetBSD nor on OpenBSD.
     }
 }