freebsd add uuidgen fn.

Author: devnexen

libc-test/build.rs

@@ -1818,6 +1818,7 @@ fn test_freebsd(target: &str) {
                 "sys/un.h",
                 "sys/user.h",
                 "sys/utsname.h",
+                "sys/uuid.h",
                 "sys/wait.h",
                 "libprocstat.h",
                 "syslog.h",

libc-test/semver/freebsd.txt

@@ -1365,6 +1365,7 @@ _SC_XOPEN_STREAMS
 _SC_XOPEN_UNIX
 _SC_XOPEN_VERSION
 _SC_XOPEN_XCU_VERSION
+_UUID_NODE_LEN
 __c_anonymous_cr_pid
 __error
 __xuname
@@ -1751,6 +1752,7 @@ telldir
 timex
 truncate
 ttyname_r
+uuidgen
 unmount
 useconds_t
 uselocale

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

@@ -24,6 +24,8 @@ pub type pthread_spinlock_t = *mut __c_anonymous_pthread_spinlock;
 pub type pthread_barrierattr_t = *mut __c_anonymous_pthread_barrierattr;
 pub type pthread_barrier_t = *mut __c_anonymous_pthread_barrier;
 
+pub type uuid_t = ::uuid;
+
 s! {
     pub struct aiocb {
         pub aio_fildes: ::c_int,
@@ -152,6 +154,15 @@ s! {
         c_spare: [u32; 1],
     }
 
+    pub struct uuid {
+        pub time_low: u32,
+        pub time_mid: u16,
+        pub time_hi_and_version: u16,
+        pub clock_seq_hi_and_reserved: u8,
+        pub clock_seq_low: u8,
+        pub node: [u8; _UUID_NODE_LEN],
+    }
+
     pub struct __c_anonymous_pthread_spinlock {
         s_clock: umutex,
     }
@@ -1383,6 +1394,8 @@ pub const _PC_ACL_NFS4: ::c_int = 64;
 
 pub const _SC_CPUSET_SIZE: ::c_int = 122;
 
+pub const _UUID_NODE_LEN: usize = 6;
+
 // Flags which can be passed to pdfork(2)
 pub const PD_DAEMON: ::c_int = 0x00000001;
 pub const PD_CLOEXEC: ::c_int = 0x00000002;
@@ -1766,6 +1779,8 @@ extern "C" {
         newfd: ::c_int,
     ) -> ::c_int;
 
+    pub fn uuidgen(store: *mut uuid, count: ::c_int) -> ::c_int;
+
     pub fn pthread_getthreadid_np() -> ::c_int;
     pub fn pthread_getaffinity_np(
         td: ::pthread_t,