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Subject[tip:perf/core] perf tools: Add missing sigqueue() prototype for systems lacking it
Commit-ID:  748fe0889c1ff12d378946bd5326e8ee8eacf5cf
Author: Arnaldo Carvalho de Melo <>
AuthorDate: Tue, 11 Dec 2018 15:48:47 -0300
Committer: Arnaldo Carvalho de Melo <>
CommitDate: Tue, 18 Dec 2018 12:23:56 -0300

perf tools: Add missing sigqueue() prototype for systems lacking it

There are systems such as the Android NDK API level 24 has the
sigqueue() function but doesn't provide a prototype, adding noise to the

util/evlist.c: In function 'perf_evlist__prepare_workload':
util/evlist.c:1494:4: warning: implicit declaration of function 'sigqueue' [-Wimplicit-function-declaration]
if (sigqueue(getppid(), SIGUSR1, val))
util/evlist.c:1494:4: warning: nested extern declaration of 'sigqueue' [-Wnested-externs]

Define a LACKS_SIGQUEUE_PROTOTYPE define so that code needing that can
get a prototype.

Checked in the bionic git repo to be available since level 23:

int sigqueue(pid_t __pid, int __signal, const union sigval __value) __INTRODUCED_IN(23);

Cc: Adrian Hunter <>
Cc: Jiri Olsa <>
Cc: Namhyung Kim <>
Signed-off-by: Arnaldo Carvalho de Melo <>
tools/perf/Makefile.config | 1 +
tools/perf/util/evlist.c | 4 ++++
2 files changed, 5 insertions(+)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index b66f97a04b12..265a9225e5fc 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -294,6 +294,7 @@ ifndef NO_BIONIC
$(call feature_check,bionic)
ifeq ($(feature-bionic), 1)
EXTLIBS := $(filter-out -lrt,$(EXTLIBS))
EXTLIBS := $(filter-out -lpthread,$(EXTLIBS))
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index e90575192209..8c902276d4b4 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -34,6 +34,10 @@
#include <linux/log2.h>
#include <linux/err.h>

+int sigqueue(pid_t pid, int sig, const union sigval value);
#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)

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