sys_linux: fix building with older kernel headers

Programming pins for external PHC timestamping was added in Linux 3.15,
but the PHC subsystem is older than that. Compile the programming code
only when the ioctl is defined.

diff --git a/sys_linux.c b/sys_linux.c
index 2f84246e0d0303216d1e2dd79cb7cf9457283588..f2f65aa496c8941709a1cce68ed1cd370ea6947b 100644 (file)
--- a/sys_linux.c
+++ b/sys_linux.c
@@ -517,7 +517,10 @@ SYS_Linux_EnableSystemCallFilter(int level)
   const static unsigned long ioctls[] = {
     FIONREAD, TCGETS,
 #if defined(FEAT_PHC) || defined(HAVE_LINUX_TIMESTAMPING)
-    PTP_EXTTS_REQUEST, PTP_PIN_SETFUNC, PTP_SYS_OFFSET,
+    PTP_EXTTS_REQUEST, PTP_SYS_OFFSET,
+#ifdef PTP_PIN_SETFUNC
+    PTP_PIN_SETFUNC,
+#endif
 #ifdef PTP_SYS_OFFSET_PRECISE
     PTP_SYS_OFFSET_PRECISE,
 #endif
@@ -822,8 +825,9 @@ int
 SYS_Linux_SetPHCExtTimestamping(int fd, int pin, int channel,
                                 int rising, int falling, int enable)
 {
-  struct ptp_pin_desc pin_desc;
   struct ptp_extts_request extts_req;
+#ifdef PTP_PIN_SETFUNC
+  struct ptp_pin_desc pin_desc;
 
   memset(&pin_desc, 0, sizeof (pin_desc));
   pin_desc.index = pin;
@@ -834,6 +838,10 @@ SYS_Linux_SetPHCExtTimestamping(int fd, int pin, int channel,
     DEBUG_LOG("ioctl(%s) failed : %s", "PTP_PIN_SETFUNC", strerror(errno));
     return 0;
   }
+#else
+  DEBUG_LOG("Missing PTP_PIN_SETFUNC");
+  return 0;
+#endif
 
   memset(&extts_req, 0, sizeof (extts_req));
   extts_req.index = channel;