T_exitval is defined as 'static int' in lib/tst_res.c, so it won't be
accessed directly from other source files.
Consider below scenario:
If a testcase need to fork a child process to do test work, indeed child
process is ok to call tst_resm() or tst_brkm(), in the end, child process
should also call tst_exit() to report the test result to parent process.
Then we should avoid the potential risk introduced by the kernel COW mechanism
when forking, so every child process should first call tst_reset_exitval() at
the beginning of the test.
Signed-off-by: Xiaoguang Wang <wangxg.f...@cn.fujitsu.com>
---
include/test.h | 1 +
lib/tst_res.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/include/test.h b/include/test.h
index a4a23e3..3d8bb7c 100644
--- a/include/test.h
+++ b/include/test.h
@@ -118,6 +118,7 @@ extern int Forker_npids;
/* lib/tst_res.c */
const char *strttype(int ttype);
+void tst_reset_exitval(void);
void tst_res(int ttype, const char *fname, const char *arg_fmt, ...)
__attribute__ ((format (printf, 3, 4)));
void tst_resm(int ttype, const char *arg_fmt, ...)
diff --git a/lib/tst_res.c b/lib/tst_res.c
index 31186e0..079fc42 100644
--- a/lib/tst_res.c
+++ b/lib/tst_res.c
@@ -224,6 +224,10 @@ const char *strttype(int ttype)
/* Include table of signals and tst_strsig() function*/
#include "signame.h"
+void tst_reset_exitval(void)
+{
+ T_exitval = 0;
+}
/*
* tst_res() - Main result reporting function. Handle test information
* appropriately depending on output display mode. Call
--
1.8.2.1
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