The manual page clearly states that

  gettid() is Linux-specific and should not be used in programs
  that are intended to be portable.

Unfortunately, it looks like macOS implemented the functionality
and defined SYS_gettid accordingly, only to deprecate syscall()
altogether with 10.12 (Sierra), released last late year.

To avoid compilation errors, call gettid() on Linux only.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
---
 src/util/virthread.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/util/virthread.c b/src/util/virthread.c
index 6c495158f..05b5572f5 100644
--- a/src/util/virthread.c
+++ b/src/util/virthread.c
@@ -268,7 +268,7 @@ bool virThreadIsSelf(virThreadPtr thread)
  * the pthread_self() id on Linux.  */
 unsigned long long virThreadSelfID(void)
 {
-#if defined(HAVE_SYS_SYSCALL_H) && defined(SYS_gettid)
+#if defined(HAVE_SYS_SYSCALL_H) && defined(SYS_gettid) && defined(__linux__)
     pid_t tid = syscall(SYS_gettid);
     return tid;
 #else
-- 
2.14.3

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On Mon, Dec 04, 2017 at 05:23:45PM +0100, Andrea Bolognani wrote:
> The manual page clearly states that
> 
>   gettid() is Linux-specific and should not be used in programs
>   that are intended to be portable.
> 
> Unfortunately, it looks like macOS implemented the functionality
> and defined SYS_gettid accordingly, only to deprecate syscall()
> altogether with 10.12 (Sierra), released last late year.
> 
> To avoid compilation errors, call gettid() on Linux only.
> 
> Signed-off-by: Andrea Bolognani <abologna@redhat.com>
> ---
>  src/util/virthread.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/util/virthread.c b/src/util/virthread.c
> index 6c495158f..05b5572f5 100644
> --- a/src/util/virthread.c
> +++ b/src/util/virthread.c
> @@ -268,7 +268,7 @@ bool virThreadIsSelf(virThreadPtr thread)
>   * the pthread_self() id on Linux.  */
>  unsigned long long virThreadSelfID(void)
>  {
> -#if defined(HAVE_SYS_SYSCALL_H) && defined(SYS_gettid)
> +#if defined(HAVE_SYS_SYSCALL_H) && defined(SYS_gettid) && defined(__linux__)
>      pid_t tid = syscall(SYS_gettid);
>      return tid;
>  #else

Reviewed-by: Daniel P. Berrange <berrange@redhat.com>


Regards,
Daniel
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