Correct the usage of MPI_Wtime in darshan-posix.c and add a runtime

check to make sure memory alignment value is ok.


git-svn-id: https://svn.mcs.anl.gov/repos/darshan/trunk@372 3b7491f3-a168-0410-bf4b-c445ed680a29

lib/darshan-posix.c

@@ -41,7 +41,6 @@ extern char* __progname_full;
 #define DARSHAN_MPI_CALL(func) __real_ ## func
 
 #define MAP_OR_FAIL(func) \
-    fprintf(stderr, "Trapped: %s\n", #func); \
     if (!(__real_ ## func)) \
     { \
         __real_ ## func = dlsym(RTLD_NEXT, #func); \
@@ -52,7 +51,7 @@ extern char* __progname_full;
     }
 
 
-extern double __real_PMPI_Wtime(void);
+extern double (*__real_PMPI_Wtime)(void);
 
 #else
 
@@ -1126,6 +1125,12 @@ void darshan_initialize(int argc, char** argv,  int nprocs, int rank)
         darshan_mem_alignment = __CP_MEM_ALIGNMENT;
     }
 
+    /* avoid floating point errors on faulty input */
+    if (darshan_mem_alignment < 1)
+    {
+        darshan_mem_alignment = 1;
+    }
+
     /* allocate structure to track darshan_global_job information */
     darshan_global_job = malloc(sizeof(*darshan_global_job));
     if(!darshan_global_job)