Auto merge of #2907 - semarie:openbsd-getmntinfo, r=JohnTitor

openbsd: add getmntinfo(3) and getfsstat(2) support

it passes testsuite on OpenBSD

Author: bors

libc-test/semver/openbsd.txt

@@ -497,6 +497,9 @@ MSG_CMSG_CLOEXEC
 MSG_DONTWAIT
 MSG_MCAST
 MSG_NOSIGNAL
+MNT_LAZY
+MNT_NOWAIT
+MNT_WAIT
 NET_RT_DUMP
 NET_RT_FLAGS
 NET_RT_IFLIST
@@ -999,6 +1002,7 @@ futimes
 getdomainname
 getdtablesize
 getentropy
+getfsstat
 getgrent
 getgrgid
 getgrgid_r
@@ -1010,6 +1014,7 @@ getifaddrs
 getitimer
 getline
 getloadavg
+getmntinfo
 getnameinfo
 getpeereid
 getpriority

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

@@ -1639,6 +1639,10 @@ pub const SF_ARCHIVED: ::c_uint = 0x00010000;
 pub const SF_IMMUTABLE: ::c_uint = 0x00020000;
 pub const SF_APPEND: ::c_uint = 0x00040000;
 
+pub const MNT_WAIT: ::c_int = 1;
+pub const MNT_NOWAIT: ::c_int = 2;
+pub const MNT_LAZY: ::c_int = 3;
+
 const_fn! {
     {const} fn _ALIGN(p: usize) -> usize {
         (p + _ALIGNBYTES) & !_ALIGNBYTES
@@ -1880,6 +1884,8 @@ cfg_if! {
             // these functions use statfs which uses the union mount_info:
             pub fn statfs(path: *const ::c_char, buf: *mut statfs) -> ::c_int;
             pub fn fstatfs(fd: ::c_int, buf: *mut statfs) -> ::c_int;
+            pub fn getmntinfo(mntbufp: *mut *mut ::statfs, flags: ::c_int) -> ::c_int;
+            pub fn getfsstat(buf: *mut statfs, bufsize: ::size_t, flags: ::c_int) -> ::c_int;
         }
     }
 }