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[tests/libc] Add test 0004-assert.c

Some small changes are done to all the other tests too.

--- a/tests/libc/execute/0001-abort.c

+++ b/tests/libc/execute/0001-abort.c

@@ -1,4 +1,4 @@

-

+#include <assert.h>

 #include <stdio.h>

 #include <signal.h>

 #include <stdlib.h>

@@ -13,9 +13,9 @@

 main(void)

 {

 	printf("aborting\n");

-	signal(SIGABRT, handler);

+	assert(signal(SIGABRT, handler) != SIG_ERR);

 	abort();

 	printf("borning\n");

-	return 1;

+	return 0;

 }

--- a/tests/libc/execute/0002-assert.c

+++ b/tests/libc/execute/0002-assert.c

@@ -1,9 +1,11 @@

 #include <assert.h>

 #include <signal.h>

+#include <stdio.h>

+#include <stdlib.h>

 void

-handler(void)

+handler(int dummy)

 {

 	_Exit(0);

 }

@@ -14,7 +16,7 @@

 	int i;

 	char c;

-	signal(SIGABRT, handler);

+	assert(signal(SIGABRT, handler) != SIG_ERR);

 	printf("First assert\n");

 	assert(sizeof(i) >= sizeof(c));

@@ -22,5 +24,5 @@

 	printf("Second assert, that must fail\n");

 	assert(sizeof(i) < sizeof(c));

-	return 1;

+	return 0;

 }

--- a/tests/libc/execute/0003-assert.c

+++ b/tests/libc/execute/0003-assert.c

@@ -1,5 +1,5 @@

 #include <assert.h>

-#include <signal.h>

+#include <stdio.h>

 int

 main()

--- a/tests/libc/execute/chktest.sh

+++ b/tests/libc/execute/chktest.sh

@@ -8,14 +8,12 @@

 while read i state

 do

-	rm -f a.out

+	rm -f a.out *.o

-	(echo

-	 echo $i

-	 ./cc.sh $CFLAGS $i.c &&

-	 ./a.out > $tmp &&

-	 cat $tmp

-	 diff -u $tmp $i.txt) > test.log 2>&1 &&

+	(echo $i

+	 ./cc.sh $CFLAGS $i.c

+	 ./a.out > $tmp

+	 diff -u $tmp $i.txt) >> test.log 2>&1 &&

 	printf '[PASS]' || printf '[FAIL]'

 	printf '%s: %s\n' "$state" "$i"

 done < $file

--- a/tests/libc/execute/libc-tests.lst

+++ b/tests/libc/execute/libc-tests.lst

@@ -1,3 +1,4 @@

 0001-abort

 0002-assert

 0003-assert

+0004-abort