Add O_DIRECTORY for FreeBSD, DragonFly, and OpenBSD-like

Author: equal-l2

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

@@ -138,6 +138,7 @@ pub const PTHREAD_STACK_MIN: ::size_t = 1024;
 pub const SIGSTKSZ: ::size_t = 40960;
 pub const MADV_INVAL: ::c_int = 10;
 pub const O_CLOEXEC: ::c_int = 0x00020000;
+pub const O_DIRECTORY: ::c_int = 0x08000000;
 pub const F_GETLK: ::c_int = 7;
 pub const F_SETLK: ::c_int = 8;
 pub const F_SETLKW: ::c_int = 9;

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

@@ -139,6 +139,7 @@ pub const SF_NODISKIO: ::c_int = 0x00000001;
 pub const SF_MNOWAIT: ::c_int = 0x00000002;
 pub const SF_SYNC: ::c_int = 0x00000004;
 pub const O_CLOEXEC: ::c_int = 0x00100000;
+pub const O_DIRECTORY: ::c_int = 0x00020000;
 pub const F_GETLK: ::c_int = 11;
 pub const F_SETLK: ::c_int = 12;
 pub const F_SETLKW: ::c_int = 13;

src/unix/bsd/netbsdlike/openbsdlike/mod.rs

@@ -140,6 +140,7 @@ pub const UT_LINESIZE: usize = 8;
 pub const UT_HOSTSIZE: usize = 256;
 
 pub const O_CLOEXEC: ::c_int = 0x10000;
+pub const O_DIRECTORY: ::c_int = 0x20000;
 
 pub const MS_SYNC : ::c_int = 0x0002;
 pub const MS_INVALIDATE : ::c_int = 0x0004;