Cosmetic changes to remove some annoying valgrind messages.

src/nxt_clang.h

@@ -230,4 +230,6 @@ nxt_trunc_ptr(p, a)                                                           \
     (u_char *) ((uintptr_t) (p) & ~((uintptr_t) (a) - 1))
 
 
+#define NXT_PACKED  __attribute__((packed))
+
 #endif /* _NXT_CLANG_H_INCLUDED_ */

src/nxt_port.h

@@ -30,7 +30,7 @@ typedef struct {
 
     /* Message data send using mmap, next chunk is a nxt_port_mmap_msg_t. */
     uint8_t              mmap;      /* 1 bit */
-} nxt_port_msg_t;
+} NXT_PACKED nxt_port_msg_t;
 
 
 typedef struct {
@@ -91,7 +91,7 @@ typedef struct {
     size_t              max_size;
     size_t              max_share;
     nxt_process_type_t  type:8;
-} nxt_port_msg_new_port_t;
+} NXT_PACKED nxt_port_msg_new_port_t;
 
 
 /*

src/nxt_socketpair.c

@@ -188,6 +188,10 @@ nxt_sendmsg(nxt_socket_t s, nxt_fd_t fd, nxt_iobuf_t *iob, nxt_uint_t niob)
         msg.msg_control = (caddr_t) &cmsg;
         msg.msg_controllen = sizeof(cmsg);
 
+#if (NXT_VALGRIND)
+        nxt_memzero(&cmsg, sizeof(cmsg));
+#endif
+
         cmsg.cm.cmsg_len = CMSG_LEN(sizeof(int));
         cmsg.cm.cmsg_level = SOL_SOCKET;
         cmsg.cm.cmsg_type = SCM_RIGHTS;
@@ -231,6 +235,10 @@ nxt_recvmsg(nxt_socket_t s, nxt_fd_t *fd, nxt_iobuf_t *iob, nxt_uint_t niob)
 
     *fd = -1;
 
+#if (NXT_VALGRIND)
+    nxt_memzero(&cmsg, sizeof(cmsg));
+#endif
+
     n = recvmsg(s, &msg, 0);
 
     if (n > 0