[LTP] [PATCH v3] lstat/lstat02.c: add ELOOP errno test

[Zeng Linggang]

Add ELOOP errno test for lstat(2)

Signed-off-by: Zeng Linggang <zenglg...@cn.fujitsu.com>
---
 testcases/kernel/syscalls/lstat/lstat02.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/lstat/lstat02.c 
b/testcases/kernel/syscalls/lstat/lstat02.c
index d108c12..d3554cc 100644
--- a/testcases/kernel/syscalls/lstat/lstat02.c
+++ b/testcases/kernel/syscalls/lstat/lstat02.c
@@ -29,6 +29,8 @@
  *     component is too long.
  *   5) lstat(2) returns -1 and sets errno to ENOTDIR if the directory
  *     component in pathname is not a directory.
+ *   6) lstat(2) returns -1 and sets errno to ELOOP if the pathname has too
+ *     many symbolic links encountered while traversing.
  */
 
 #include <stdio.h>
@@ -53,8 +55,10 @@
 #define TEST_EACCES    TEST_DIR"/test_eacces"
 #define TEST_ENOENT    ""
 #define TEST_ENOTDIR   "test_file/test_enotdir"
+#define TEST_ELOOP     "/test_eloop"
 
 static char longpathname[PATH_MAX + 2];
+static char elooppathname[sizeof(TEST_ELOOP) * 43] = ".";
 
 #if !defined(UCLINUX)
 static void bad_addr_setup(int);
@@ -74,11 +78,13 @@ static struct test_case_t {
 #endif
        {longpathname, ENAMETOOLONG, NULL},
        {TEST_ENOTDIR, ENOTDIR, NULL},
+       {elooppathname, ELOOP, NULL},
 };
 
 char *TCID = "lstat02";
 int TST_TOTAL = ARRAY_SIZE(test_cases);
-static int exp_enos[] = { EACCES, EFAULT, ENAMETOOLONG, ENOENT, ENOTDIR, 0 };
+static int exp_enos[] = { EACCES, EFAULT, ENAMETOOLONG, ENOENT,
+                         ENOTDIR, ELOOP, 0 };
 
 static void setup(void);
 static void lstat_verify(int);
@@ -110,6 +116,7 @@ int main(int ac, char **av)
 
 static void setup(void)
 {
+       int i;
        struct passwd *ltpuser;
 
        tst_require_root(NULL);
@@ -131,6 +138,15 @@ static void setup(void)
        SAFE_TOUCH(cleanup, "test_file", MODE_RWX, NULL);
 
        memset(longpathname, 'a', PATH_MAX+1);
+
+       SAFE_MKDIR(cleanup, "test_eloop", MODE_RWX);
+       SAFE_SYMLINK(cleanup, "../test_eloop", "test_eloop/test_eloop");
+       /*
+        * NOTE: the ELOOP test is written based on that the consecutive
+        * symlinks limits in kernel is hardwired to 40.
+        */
+       for (i = 0; i < 43; i++)
+               strcat(elooppathname, TEST_ELOOP);
 }
 
 #if !defined(UCLINUX)
-- 
1.8.4.2




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