Fix: namespace our gettid wrapper

Since glibc 2.30, a gettid wrapper was added that conflicts with our
static declaration. Namespace our wrapper so there is no conflict,
we'll add support for the glibc provided wrapper in a further commit.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
(cherry picked from commit 0f029713c868ef3e868d0dc7297455cb737e606f)

Change-Id: I896e5e838e37096edf941ade786bd7a2a8566321

diff --git a/include/lttng/ust-tid.h b/include/lttng/ust-tid.h
index e669d7e..e637718 100644 (file)
--- a/include/lttng/ust-tid.h
+++ b/include/lttng/ust-tid.h
@@ -31,23 +31,25 @@
 #include <syscall.h>
 #endif
 
-#if defined(_syscall0)
-_syscall0(pid_t, gettid)
-#elif defined(__NR_gettid)
+#if defined(__NR_gettid)
+
 #include <unistd.h>
-static inline pid_t gettid(void)
+static inline pid_t lttng_gettid(void)
 {
        return syscall(__NR_gettid);
 }
+
 #else
+
 #include <sys/types.h>
 #include <unistd.h>
 
 /* Fall-back on getpid for tid if not available. */
-static inline pid_t gettid(void)
+static inline pid_t lttng_gettid(void)
 {
        return getpid();
 }
+
 #endif
 
 #endif /* _LTTNG_UST_TID_H */

diff --git a/include/usterr-signal-safe.h b/include/usterr-signal-safe.h
index 1df5ada..d987c1f 100644 (file)
--- a/include/usterr-signal-safe.h
+++ b/include/usterr-signal-safe.h
@@ -95,7 +95,7 @@ do {                                                                  \
        do {                                    \
                sigsafe_print_err(UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" UST_XSTR(__LINE__) ")\n", \
                (long) getpid(),                \
-               (long) gettid(),                \
+               (long) lttng_gettid(),          \
                ## args, __func__);             \
        } while(0)
 

diff --git a/liblttng-ust/lttng-context-vtid.c b/liblttng-ust/lttng-context-vtid.c
index a213b26..1a0ac44 100644 (file)
--- a/liblttng-ust/lttng-context-vtid.c
+++ b/liblttng-ust/lttng-context-vtid.c
@@ -62,7 +62,7 @@ pid_t wrapper_getvtid(void)
 
        vtid = CMM_LOAD_SHARED(URCU_TLS(cached_vtid));
        if (caa_unlikely(!vtid)) {
-               vtid = getpid();
+               vtid = lttng_gettid();
                CMM_STORE_SHARED(URCU_TLS(cached_vtid), vtid);
        }
        return vtid;