[LTP] [PATCH 2/3] generate_syscall.sh: add a helper named tst_syscall_base

[Gang Yan]

From: Gang Yan <yangang@kylinos.cn>

This patch adds a helper named tst_syscall_base, it can check the
syscall on older distros without tst_brk.

Signed-off-by: Gang Yan <yangang@kylinos.cn>
---
 include/lapi/syscalls/generate_syscalls.sh | 27 +++++++++++++---------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/include/lapi/syscalls/generate_syscalls.sh b/include/lapi/syscalls/generate_syscalls.sh
index 19f280dfb..95c2c9aeb 100755
--- a/include/lapi/syscalls/generate_syscalls.sh
+++ b/include/lapi/syscalls/generate_syscalls.sh
@@ -49,18 +49,23 @@ tst_brkm(TCONF, dummy_cleanup, \
 })
 #endif
 
+#define tst_syscall_base(NR, ...) ({ \
+    intptr_t tst_ret; \
+    if (NR == __LTP__NR_INVALID_SYSCALL) { \
+        errno = ENOSYS; \
+        tst_ret = -1; \
+    } else { \
+        tst_ret = syscall(NR, ##__VA_ARGS__); \
+    } \
+    tst_ret; \
+})
+
 #define tst_syscall(NR, ...) ({ \
-intptr_t tst_ret; \
-if (NR == __LTP__NR_INVALID_SYSCALL) { \
-	errno = ENOSYS; \
-	tst_ret = -1; \
-} else { \
-	tst_ret = syscall(NR, ##__VA_ARGS__); \
-} \
-if (tst_ret == -1 && errno == ENOSYS) { \
-	TST_SYSCALL_BRK__(NR, #NR); \
-} \
-tst_ret; \
+    intptr_t tst_ret = tst_syscall_base(NR, ##__VA_ARGS__); \
+    if (tst_ret == -1 && errno == ENOSYS) { \
+        TST_SYSCALL_BRK__(NR, #NR); \
+    } \
+    tst_ret; \
 })
 
 #define __LTP__NR_INVALID_SYSCALL -1' >${SYSCALLS_FILE}
-- 
2.43.0