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ptp: In the testptp utility, use clock_adjtime from glibc when available

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clock_adjtime was included in glibc 2.14. _GNU_SOURCE must be defined
to make it available.

Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
Cc: Richard Cochran <richardcochran@gmail.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christian Riesch 2014-06-16 14:46:45 +02:00 committed by David S. Miller
parent ddc6fbd83a
commit 42e1358e10
1 changed files with 4 additions and 1 deletions
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5
Documentation/ptp/testptp.c
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@ -17,6 +17,7 @@
* along with this program; if not, write to the Free Software * along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/ */
#define _GNU_SOURCE
#include <errno.h> #include <errno.h>
#include <fcntl.h> #include <fcntl.h>
#include <inttypes.h> #include <inttypes.h>
@ -46,12 +47,14 @@
#define CLOCK_INVALID -1 #define CLOCK_INVALID -1
#endif #endif
/* When glibc offers the syscall, this will go away. */ /* clock_adjtime is not available in GLIBC < 2.14 */
#if !__GLIBC_PREREQ(2, 14)
#include <sys/syscall.h> #include <sys/syscall.h>
static int clock_adjtime(clockid_t id, struct timex *tx) static int clock_adjtime(clockid_t id, struct timex *tx)
{ {
return syscall(__NR_clock_adjtime, id, tx); return syscall(__NR_clock_adjtime, id, tx);
} }
#endif
static clockid_t get_clockid(int fd) static clockid_t get_clockid(int fd)
{ {