Support compile with clang on BSD

A couple of changes to make the code compile on BSD systems with clang

src/server.c

@@ -11,6 +11,9 @@
 #include "logger.h"
 #include "transport.h"
 #include "vfs.h"
+#ifdef HAVE_SYS_UCRED_H
+#include <sys/ucred.h>
+#endif
 
 /* Special ID for the bootstrap node. Equals to raft_digest("1", 0). */
 #define BOOTSTRAP_ID 0x2dc171858c3155be
@@ -211,10 +214,11 @@ int dqlite_node_set_bind_address(dqlite_node *t, const char *address)
  len += sizeof(sa_family_t);
  addr = (struct sockaddr *)&addr_un;
  }
- fd = socket(domain, SOCK_STREAM | SOCK_CLOEXEC, 0);
+ fd = socket(domain, SOCK_STREAM, 0);
  if (fd == -1) {
  return DQLITE_ERROR;
  }
+ fcntl(fd, O_CLOEXEC);
  if (domain == AF_INET) {
  int reuse = 1;
  rv = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
@@ -431,6 +435,20 @@ static void listenCb(uv_stream_t *listener, int status)
 
  /* We accept unix socket connections only from the same process. */
  if (listener->type == UV_NAMED_PIPE) {
+#if HAVE_DECL_LOCAL_PEERCRED
+ struct xucred cred;
+ socklen_t len;
+ int fd;
+ fd = stream->io_watcher.fd;
+ len = sizeof cred;
+ rv = getsockopt(fd, SOL_SOCKET, LOCAL_PEERCRED, &cred, &len);
+ if (rv != 0) {
+ goto err;
+ }
+ if (cred.cr_pid != getpid()) {
+ goto err;
+ }
+#elif HAVE_DECL_SO_PEERCRED
  struct ucred cred;
  socklen_t len;
  int fd;
@@ -443,6 +461,7 @@ static void listenCb(uv_stream_t *listener, int status)
  if (cred.pid != getpid()) {
  goto err;
  }
+#endif
  }
 
  conn = sqlite3_malloc(sizeof *conn);