[LTP] [PATCH] Define __SIGRTMIN and __SIGRTMAX for MUSL

[Daniel Díaz]

Some libc implementations might differ in the definitions they
include. Exempli gratia: MUSL does not define __SIGRTMAX nor
__SIGRTMIN.

These two tests fail to build because of the missing
definitions:
  testcases/kernel/syscalls/ptrace/ptrace05.c
  testcases/kernel/syscalls/sighold/sighold02.c

Out of precaution, these two also include this header:
  lib/tst_sig.c
  testcases/kernel/syscalls/rt_sigsuspend/rt_sigsuspend01.c

Signed-off-by: Daniel Díaz <daniel.diaz@linaro.org>
---
 include/lapi/signal.h                         | 24 +++++++++++++++++++
 lib/tst_sig.c                                 |  1 +
 testcases/kernel/syscalls/ptrace/ptrace05.c   |  1 +
 .../syscalls/rt_sigsuspend/rt_sigsuspend01.c  |  1 +
 testcases/kernel/syscalls/sighold/sighold02.c |  1 +
 5 files changed, 28 insertions(+)
 create mode 100644 include/lapi/signal.h

diff --git a/include/lapi/signal.h b/include/lapi/signal.h
new file mode 100644
index 000000000..d22965a94
--- /dev/null
+++ b/include/lapi/signal.h
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2019 Linaro Limited. All rights reserved.
+ * Author: Daniel Díaz <daniel.diaz@linaro.org>
+ */
+
+#ifndef LAPI_SIGNAL_H
+#define LAPI_SIGNAL_H
+
+#include <signal.h>
+
+/*
+ * Some libc implementations might differ in the definitions they include. This
+ * covers those differences for all tests to successfully build.
+ */
+
+#ifndef __SIGRTMIN
+# define __SIGRTMIN 32
+#endif
+#ifndef __SIGRTMAX
+# define __SIGRTMAX (_NSIG - 1)
+#endif
+
+#endif
diff --git a/lib/tst_sig.c b/lib/tst_sig.c
index 36565e13d..6d77aeafd 100644
--- a/lib/tst_sig.c
+++ b/lib/tst_sig.c
@@ -72,6 +72,7 @@
 #include <signal.h>
 #include <unistd.h>
 #include "test.h"
+#include "lapi/signal.h"
 
 #define MAXMESG 150		/* size of mesg string sent to tst_res */
 
diff --git a/testcases/kernel/syscalls/ptrace/ptrace05.c b/testcases/kernel/syscalls/ptrace/ptrace05.c
index 420330029..54cfa4d7b 100644
--- a/testcases/kernel/syscalls/ptrace/ptrace05.c
+++ b/testcases/kernel/syscalls/ptrace/ptrace05.c
@@ -38,6 +38,7 @@
 #include "ptrace.h"
 
 #include "test.h"
+#include "lapi/signal.h"
 
 char *TCID = "ptrace05";
 int TST_TOTAL = 0;
diff --git a/testcases/kernel/syscalls/rt_sigsuspend/rt_sigsuspend01.c b/testcases/kernel/syscalls/rt_sigsuspend/rt_sigsuspend01.c
index f17a9aae6..e577cf227 100644
--- a/testcases/kernel/syscalls/rt_sigsuspend/rt_sigsuspend01.c
+++ b/testcases/kernel/syscalls/rt_sigsuspend/rt_sigsuspend01.c
@@ -18,6 +18,7 @@
 #include "tst_test.h"
 #include "lapi/syscalls.h"
 #include "lapi/safe_rt_signal.h"
+#include "lapi/signal.h"
 
 static void sig_handler(int sig)
 {
diff --git a/testcases/kernel/syscalls/sighold/sighold02.c b/testcases/kernel/syscalls/sighold/sighold02.c
index d1d4b0b06..b763142df 100644
--- a/testcases/kernel/syscalls/sighold/sighold02.c
+++ b/testcases/kernel/syscalls/sighold/sighold02.c
@@ -49,6 +49,7 @@
 #include <sys/wait.h>
 #include "test.h"
 #include "safe_macros.h"
+#include "lapi/signal.h"
 
 /* _XOPEN_SOURCE disables NSIG */
 #ifndef NSIG
-- 
2.17.1