Auto merge of rust-lang#3122 - valpackett:fbsd, r=JohnTitor

FreeBSD: strchrnul, AT_EMPTY_PATH

- one related constant I missed in rust-lang#3114
- since rust-lang#3104 landed let's do that too (this function was available since FreeBSD 10)

Author: bors

libc-test/build.rs

@@ -2078,7 +2078,9 @@ fn test_freebsd(target: &str) {
             "O_RESOLVE_BENEATH" if Some(12) > freebsd_ver => true,
 
             // These constants were introduced in FreeBSD 13:
-            "O_DSYNC" | "O_PATH" | "O_EMPTY_PATH" if Some(13) > freebsd_ver => true,
+            "O_DSYNC" | "O_PATH" | "O_EMPTY_PATH" | "AT_EMPTY_PATH" if Some(13) > freebsd_ver => {
+                true
+            }
 
             // FIXME: These are deprecated - remove in a couple of releases.
             // These constants were removed in FreeBSD 11 (svn r273250) but will

libc-test/semver/freebsd.txt

@@ -86,6 +86,7 @@ ATF_USETRAILERS
 AT_BASE
 AT_EACCESS
 AT_EGID
+AT_EMPTY_PATH
 AT_ENTRY
 AT_EUID
 AT_EXECPATH
@@ -2109,6 +2110,7 @@ stack_t
 statfs
 strcasecmp
 strcasestr
+strchrnul
 strncasecmp
 strndup
 strsignal

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -3737,6 +3737,7 @@ pub const AT_EACCESS: ::c_int = 0x100;
 pub const AT_SYMLINK_NOFOLLOW: ::c_int = 0x200;
 pub const AT_SYMLINK_FOLLOW: ::c_int = 0x400;
 pub const AT_REMOVEDIR: ::c_int = 0x800;
+pub const AT_EMPTY_PATH: ::c_int = 0x4000;
 
 pub const AT_NULL: ::c_int = 0;
 pub const AT_IGNORE: ::c_int = 1;
@@ -5249,6 +5250,8 @@ extern "C" {
         rmtp: *mut ::timespec,
     ) -> ::c_int;
 
+    pub fn strchrnul(s: *const ::c_char, c: ::c_int) -> *mut ::c_char;
+
     pub fn shm_create_largepage(
         path: *const ::c_char,
         flags: ::c_int,