elf: Add test Elf_Ehdr.readelf

$ ./src/tests/ulpatch_test -f Elf_Ehdr.readelf -v
=========================================
===
=== ULPatch Testing
===
===  version: v0.5.7-78-g0408-dirty
=== ---------------------------
===   13/74   Elf_Ehdr.readelf
ELF Header:
 Magic:   7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
 Class:                             ELF64
 Data:                              2's complement, little endian
 Version:                           1 (current)
 OS/ABI:                            UNIX - System V
 ABI Version:                       0
 Type:                              Executable file
 Machine:                           x86_64
 Version:                           0x1
 Entry point address:               0x4060b0
 Start of program headers:          64 (bytes into file)
 Start of section headers:          7122000 (bytes into file)
 Flags:                             0x0
 Size of this header:               64 (bytes)
 Size of program headers:           56 (bytes)
 Number of program headers:         13
 Size of section headers:           64 (bytes)
 Number of section headers:         43
 Section header string table index: 42
4677us OK

Signed-off-by: Rong Tao <[email protected]>

src/tests/elf/ehdr.c

@@ -22,3 +22,18 @@ TEST(Elf_Ehdr,	print,	0)
 	print_ehdr(NULL, &ehdr1);
 	return 0;
 }
+
+TEST(Elf_Ehdr,	readelf,	0)
+{
+	struct elf_file *elf;
+	elf = elf_file_open(ulpatch_test_path);
+	if (!elf) {
+		lerror("open %s failed.\n", ulpatch_test_path);
+		return -ENOENT;
+	}
+
+	print_ehdr(stdout, elf->ehdr);
+
+	elf_file_close(ulpatch_test_path);
+	return 0;
+}

src/tests/elf/open.c

@@ -32,13 +32,13 @@ TEST(Elf,	open_close,	0)
 {
 	int i;
 	int ret = 0;
+	struct elf_file *e;
 
 	for (i = 0; i < ARRAY_SIZE(test_elfs); i++) {
 		if (!fexist(test_elfs[i]))
 			continue;
 
-		struct elf_file __unused *e = elf_file_open(test_elfs[i]);
-
+		e = elf_file_open(test_elfs[i]);
 		if (!e) {
 			lerror("open %s failed.\n", test_elfs[i]);
 			ret = -1;