From: Lucas De Marchi <lucas.demarchi@intel.com>
To: linux-modules@vger.kernel.org
Cc: caio.oliveira@intel.com
Subject: [PATCH] testsuite: also wrap gettid in syscall()
Date: Mon, 8 Jan 2018 08:27:08 -0800 [thread overview]
Message-ID: <20180108162708.16662-1-lucas.demarchi@intel.com> (raw)
Not a perfect solution for overriding syscall(), but at least
it makes the testsuite to pass in a modified nsswitch.conf (one that has
a module which calls syscall() to get the thread id).
---
testsuite/init_module.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/testsuite/init_module.c b/testsuite/init_module.c
index 199186b..130dd32 100644
--- a/testsuite/init_module.c
+++ b/testsuite/init_module.c
@@ -355,6 +355,22 @@ TS_EXPORT long int syscall(long int __sysno, ...)
return ret;
}
+ if (__sysno == __NR_gettid) {
+ static void *nextlib = NULL;
+ static long (*nextlib_syscall)(long number, ...);
+
+ if (nextlib == NULL) {
+#ifdef RTLD_NEXT
+ nextlib = RTLD_NEXT;
+#else
+ nextlib = dlopen("libc.so.6", RTLD_LAZY);
+#endif
+ nextlib_syscall = dlsym(nextlib, "syscall");
+ }
+
+ return nextlib_syscall(__NR_gettid);
+ }
+
/*
* FIXME: no way to call the libc function due since this is a
* variadic argument function and we don't have a vsyscall() variant
--
2.14.3
next reply other threads:[~2018-01-08 16:27 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-08 16:27 Lucas De Marchi [this message]
2018-01-08 21:28 ` [PATCH v2] testsuite: also wrap gettid in syscall() Lucas De Marchi
2018-01-08 21:31 ` Caio Marcelo de Oliveira Filho
2018-01-08 21:55 ` Lucas De Marchi
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