From: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Date: Wed, 25 Jan 2012 00:04:46 +0000 (-0200)
Subject: testsuite: trap calls to uname
X-Git-Tag: v5~72
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=68cc44937653da88e8d5b72ad3d5eb86b5c7a424;p=thirdparty%2Fkmod.git

testsuite: trap calls to uname
---

diff --git a/Makefile.am b/Makefile.am
index 257575cd..42bf0b3d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -128,6 +128,18 @@ ${noinst_SCRIPTS}: tools/kmod-nolib
 		$(LN_S) $(notdir $<) $@)
 endif
 
+# libtool will not create a shared library that is not installed. Workaround
+# this by creating it by ourselves
+CREATE_SHARED_OVERRIDE_LIB = \
+		$(AM_V_CCLD)gcc -fPIC $(AM_CPPFLAGS) $(AM_CFLAGS) -shared $^ \
+			-o $@ $(AM_LDFLAGS) -ldl
+
+testsuite/uname.so: testsuite/uname.c
+	$(CREATE_SHARED_OVERRIDE_LIB)
+
+EXTRA_DIST += testsuite/uname.c
+CLEANFILES += testsuite/uname.so
+
 check_LTLIBRARIES = testsuite/libtestsuite.la
 testsuite_libtestsuite_la_SOURCES = testsuite/testsuite.c \
 				    testsuite/testsuite.h
diff --git a/testsuite/testsuite.h b/testsuite/testsuite.h
index 919bc6e7..d7f81203 100644
--- a/testsuite/testsuite.h
+++ b/testsuite/testsuite.h
@@ -13,6 +13,9 @@ enum test_config {
 	_TC_LAST,
 };
 
+#define S_TC_UNAME_R "TESTSUITE_UNAME_R"
+
+
 struct test {
 	const char *name;
 	const char *description;
diff --git a/testsuite/uname.c b/testsuite/uname.c
new file mode 100644
index 00000000..9a9cf63f
--- /dev/null
+++ b/testsuite/uname.c
@@ -0,0 +1,49 @@
+#include <errno.h>
+#include <dlfcn.h>
+#include <sys/utsname.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "testsuite.h"
+
+TS_EXPORT int uname(struct utsname *u)
+{
+	static void *nextlib = NULL;
+	static int (*nextlib_uname)(struct utsname *u);
+	const char *release = getenv(S_TC_UNAME_R);
+	int err;
+	size_t sz;
+
+	if (release == NULL) {
+		fprintf(stderr, "TRAP uname(): missing export %s?\n",
+							S_TC_UNAME_R);
+		errno = EFAULT;
+		return -1;
+	}
+
+	if (nextlib == NULL) {
+#ifdef RTLD_NEXT
+		nextlib = RTLD_NEXT;
+#else
+		nextlib = dlopen("libc.so.6", RTLD_LAZY);
+#endif
+		nextlib_uname = dlsym(nextlib, "uname");
+	}
+
+	err = nextlib_uname(u);
+	if (err < 0)
+		return err;
+
+	sz = strlen(release) + 1;
+	if (sz > sizeof(u->release)) {
+		fprintf(stderr, "uname(): sizeof release (%s) "
+				"is greater than available space: %lu",
+				release, sizeof(u->release));
+		errno = -EFAULT;
+		return -1;
+	}
+
+	memcpy(u->release, release, sz);
+	return 0;
+}