musl: fix missing <sys/time.h>.

Issue peported by Ethan Hawk. Our socket.c module is using struct
timeval without including <sys/time.h>, which breaks on musl.

* configure: in the select test, let's include <sys/time.h>, and
if the test passes, let's set have_sys_time, so that HAVE_SELECT
implies HAVE_SYS_TIME. This way code wrapped with HAVE_SELECT doesn't
separately have to test for HAVE_SYS_TIME.

* socket.c: If HAVE_SYS_TIME is true, then we include <sys/time.h>,
independently of HAVE_SELECT.
(sock_timeout, sock_load_init): Like the select-based code, code using
SO_SNDTIMEO or SO_RCVTIMO also uses timeval, so needs to be wrapped with
HAVE_SYS_TIME.

2 files changed, 7 insertions, 2 deletions

diff --git a/configure b/configure
index ead8bccc..63f1ec5c 100755
--- a/configure
+++ b/configure
@@ -3480,6 +3480,7 @@ if [ $have_sockets ] ; then
 
   cat > conftest.c <<!
 #include <sys/select.h>
+#include <sys/time.h>
 
 int main(int argc, char **argv)
 {
@@ -3494,6 +3495,7 @@ int main(int argc, char **argv)
   if conftest; then
     printf "yes\n"
     printf "#define HAVE_SELECT 1\n" >> config.h
+    have_sys_time=y
   else
     printf "no\n"
   fi
diff --git a/socket.c b/socket.c
index f8222b03..c4745241 100644
--- a/socket.c
+++ b/socket.c
@@ -45,6 +45,9 @@
 #elif HAVE_SELECT
 #include <sys/select.h>
 #endif
+#if HAVE_SYS_TIME
+#include <sys/time.h>
+#endif
 #include <netinet/in.h>
 #include "lib.h"
 #include "stream.h"
@@ -1045,7 +1048,7 @@ static val sock_shutdown(val sock, val how)
   return t;
 }
 
-#if defined SO_SNDTIMEO && defined SO_RCVTIMEO
+#if HAVE_SYS_TIME && defined SO_SNDTIMEO && defined SO_RCVTIMEO
 static val sock_timeout(val sock, val usec, val name, int which, val self)
 {
   cnum fd = c_num(stream_fd(sock), self);
@@ -1180,7 +1183,7 @@ void sock_load_init(void)
   reg_fun(intern(lit("sock-shutdown"), user_package), func_n2o(sock_shutdown, 1));
   reg_fun(intern(lit("open-socket"), user_package), func_n3o(open_socket, 2));
   reg_fun(intern(lit("open-socket-pair"), user_package), func_n3o(socketpair_wrap, 2));
-#if defined SO_SNDTIMEO && defined SO_RCVTIMEO
+#if HAVE_SYS_TIME && defined SO_SNDTIMEO && defined SO_RCVTIMEO
   reg_fun(intern(lit("sock-send-timeout"), user_package), func_n2(sock_send_timeout));
   reg_fun(intern(lit("sock-recv-timeout"), user_package), func_n2(sock_recv_timeout));
 #endif