Fixed: Freebsd syscall 'getpeername' is missing.

core/sys/freebsd/syscalls.odin

@@ -21,6 +21,7 @@ SYS_close      : uintptr : 6
 SYS_getpid     : uintptr : 20
 SYS_recvfrom   : uintptr : 29
 SYS_accept     : uintptr : 30
+SYS_getpeername: uintptr : 31
 SYS_getsockname: uintptr : 32
 SYS_fcntl      : uintptr : 92
 SYS_fsync      : uintptr : 95
@@ -202,24 +203,37 @@ accept_nil :: proc "contextless" (s: Fd) -> (Fd, Errno) {
 
 accept :: proc { accept_T, accept_nil }
 
+getsockname_or_peername :: proc "contextless" (s: Fd, sockaddr: ^$T, is_peer: bool) -> Errno {
+    // sockaddr must contain a valid pointer, or this will segfault because
+    // we're telling the syscall that there's memory available to write to.
+    addrlen: socklen_t = size_of(T)
+
+    result, ok := intrinsics.syscall_bsd(
+        is_peer ? SYS_getpeername : SYS_getsockname,
+        cast(uintptr)s,
+        cast(uintptr)sockaddr,
+        cast(uintptr)&addrlen
+    )
+
+    if !ok {
+            return cast(Errno)result
+    }
+
+    return nil
+}
+
+// Get name of connected peer
+//
+// The getpeername() system call appeared in 4.2BSD.
+getpeername :: proc "contextless" (s: Fd, sockaddr: ^$T) -> Errno {
+	return getsockname_or_peername(s, sockaddr, true)
+}
+
 // Get socket name.
 //
 // The getsockname() system call appeared in 4.2BSD.
 getsockname :: proc "contextless" (s: Fd, sockaddr: ^$T) -> Errno {
-	// sockaddr must contain a valid pointer, or this will segfault because
-	// we're telling the syscall that there's memory available to write to.
-	addrlen: socklen_t = size_of(T)
-
-	result, ok := intrinsics.syscall_bsd(SYS_getsockname,
-		cast(uintptr)s,
-		cast(uintptr)sockaddr,
-		cast(uintptr)&addrlen)
-
-	if !ok {
-		return cast(Errno)result
-	}
-
-	return nil
+	return getsockname_or_peername(s, sockaddr, false)
 }
 
 // Synchronize changes to a file.