Add 'const' qualifiers where needed to avoid compiler warnings.

* libltp/lib/tst_sig.c (tst_sig): Don't attempt to cleanup on
fatal errors.
* libltp/lib/parse_opts.c (parse_opts): Initialize allocated
string to prevent heap corruption.

winsup/testsuite/libltp/lib/dataascii.c

@@ -54,7 +54,7 @@ int offset;
    int ind;	/* index into CHARS array */
    char *chr;
    int chars_size;
-   char *charlist;
+   const char *charlist;
 
 	chr=buffer;
 	total=offset+bsize;
@@ -90,7 +90,7 @@ char **errmsg;
    int ind;	/* index into CHARS array */
    char *chr;
    int chars_size;
-   char *charlist;
+   const char *charlist;
 
 	chr=buffer;
 	total=offset+bsize;

winsup/testsuite/libltp/lib/open_flags.c

@@ -109,7 +109,7 @@
 static char Open_symbols[512];	  /* space for openflags2symbols return value */
 
 struct open_flag_t {
-    char *symbol;
+    const char *symbol;
     int  flag;
 };
 

winsup/testsuite/libltp/lib/parse_opts.c

@@ -144,8 +144,8 @@ static char *STD_start_break=0; /* original sbrk size */
 static int  Debug=0;
 
 struct std_option_t {
-    char *optstr;
-    char *help;
+    const char *optstr;
+    const char *help;
     char *flag;
     char **arg;
 } std_options[] = {
@@ -197,7 +197,7 @@ static void usc_recressive_func();
 /**********************************************************************
  * parse_opts: 
  **********************************************************************/
-char *
+const char *
 parse_opts(int ac, char **av, option_t *user_optarr, void (*uhf)())
 {
     int found;		/* flag to indicate that an option specified was */
@@ -236,6 +236,8 @@ parse_opts(int ac, char **av, option_t *user_optarr, void (*uhf)())
     if (!optionstr) 
 	return "parse_opts: ERROR - Could not allocate memory for optionstr";
 
+    optionstr[0] = '\0';
+
     for (i = 0; std_options[i].optstr; ++i)
 	strcat(optionstr, std_options[i].optstr);
     if (user_optarr)

winsup/testsuite/libltp/lib/tst_res.c

@@ -153,7 +153,7 @@
  */
 static void check_env();
 static void tst_condense(int tnum, int ttype, char *tmesg);
-static void tst_print(char *tcid, int tnum, int trange, int ttype, char *tmesg);
+static void tst_print(char *tcid, int tnum, int trange, int ttype, const char *tmesg);
 static void cat_file(char *filename);
 
 
@@ -216,7 +216,7 @@ char *TESTDIR = NULL;
  *             eventually get here to print the results.
  */
 void
-tst_res(int ttype, char *fname, char *arg_fmt, ...)
+tst_res(int ttype, char *fname, const char *arg_fmt, ...)
 {
    int  i;
    char tmesg[USERMESG];     /* expanded message */
@@ -407,7 +407,7 @@ tst_flush()
  *               stream.
  */
 static void
-tst_print(char *tcid, int tnum, int trange, int ttype, char *tmesg)
+tst_print(char *tcid, int tnum, int trange, int ttype, const char *tmesg)
 {
    char type[5];
 
@@ -581,7 +581,7 @@ tst_environ()
  *             tests cases.
  */
 void
-tst_brk(int ttype, char *fname, void (*func)(), char *arg_fmt, ...)
+tst_brk(int ttype, char *fname, void (*func)(), const char *arg_fmt, ...)
 {
    char    tmesg[USERMESG];      /* expanded message */
 
@@ -652,7 +652,7 @@ tst_brk(int ttype, char *fname, void (*func)(), char *arg_fmt, ...)
  *                 remaining test cases within test case loop.
  */
 void
-tst_brkloop(int ttype, char *fname, void (*func)(), char *arg_fmt, ...)
+tst_brkloop(int ttype, char *fname, void (*func)(), const char *arg_fmt, ...)
 {
    char    tmesg[USERMESG];      /* expanded message */
 
@@ -727,7 +727,7 @@ tst_brkloop(int ttype, char *fname, void (*func)(), char *arg_fmt, ...)
  * tst_resm() - Interface to tst_res(), with no filename.
  */
 void
-tst_resm(int ttype, char *arg_fmt, ...)
+tst_resm(int ttype, const char *arg_fmt, ...)
 {
    char    tmesg[USERMESG];      /* expanded message */
 
@@ -752,7 +752,7 @@ tst_resm(int ttype, char *arg_fmt, ...)
  * tst_brkm() - Interface to tst_brk(), with no filename.
  */
 void
-tst_brkm(int ttype, void (*func)(), char *arg_fmt, ...)
+tst_brkm(int ttype, void (*func)(), const char *arg_fmt, ...)
 {
    char    tmesg[USERMESG];      /* expanded message */
 
@@ -777,7 +777,7 @@ tst_brkm(int ttype, void (*func)(), char *arg_fmt, ...)
  * tst_brkloopm() - Interface to tst_brkloop(), with no filename.
  */
 void
-tst_brkloopm(int ttype, void (*func)(), char *arg_fmt, ...)
+tst_brkloopm(int ttype, void (*func)(), const char *arg_fmt, ...)
 {
    char    tmesg[USERMESG];      /* expanded message */
 

winsup/testsuite/libltp/lib/tst_sig.c

@@ -150,7 +150,15 @@ tst_sig(int fork_flag, void (*handler)(), void (*cleanup)())
 #ifdef SIGPTRESCHED
                 case SIGPTRESCHED:
 #endif /* SIGPTRESCHED */
-
+#ifdef __CYGWIN__
+		case SIGSEGV:
+		case SIGILL:
+		case SIGTRAP:
+		case SIGABRT:
+		case SIGEMT:
+		case SIGFPE:
+		case SIGBUS:
+#endif
 	            break;
 
 	        case SIGCLD: