Add F_PUNCHHOLE and fpunchhole_t

Closes #3336.

Author: anacrolix

src/unix/bsd/apple/mod.rs

@@ -378,6 +378,13 @@ s! {
         pub fst_bytesalloc: ::off_t,
     }
 
+    pub struct fpunchhole_t {
+        pub fp_flags: ::c_uint, /* unused */
+        pub reserved: ::c_uint, /* (to maintain 8-byte alignment) */
+        pub fp_offset: ::off_t, /* IN: start of the region */
+        pub fp_length: ::off_t, /* IN: size of the region */
+    }
+
     pub struct radvisory {
         pub ra_offset: ::off_t,
         pub ra_count: ::c_int,
@@ -3241,6 +3248,7 @@ pub const F_GLOBAL_NOCACHE: ::c_int = 55;
 pub const F_NODIRECT: ::c_int = 62;
 pub const F_LOG2PHYS_EXT: ::c_int = 65;
 pub const F_BARRIERFSYNC: ::c_int = 85;
+pub const F_PUNCHHOLE: ::c_int = 99;
 pub const F_GETPATH_NOFIRMLINK: ::c_int = 102;
 
 pub const F_ALLOCATECONTIG: ::c_uint = 0x02;