demonstrator for #218

darshan-test/regression/test-cases/src/access-size-counter-test.c

+/*
+ * (C) 1995-2001 Clemson University and Argonne National Laboratory.
+ *
+ * See COPYING in top-level directory.
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/time.h>
+#include <mpi.h>
+#include <errno.h>
+#include <getopt.h>
+
+/* DEFAULT VALUES FOR OPTIONS */
+static char    opt_file[256] = "test.out";
+
+/* function prototypes */
+static int parse_args(int argc, char **argv);
+static void usage(void);
+
+/* global vars */
+static int mynod = 0;
+static int nprocs = 1;
+
+int main(int argc, char **argv)
+{
+   int namelen;
+   char processor_name[MPI_MAX_PROCESSOR_NAME];
+   char buffer[128] = {0};
+   int fd;
+   int i = 1;
+   int ret;
+
+   /* startup MPI and determine the rank of this process */
+   MPI_Init(&argc,&argv);
+   MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
+   MPI_Comm_rank(MPI_COMM_WORLD, &mynod);
+   MPI_Get_processor_name(processor_name, &namelen); 
+   
+   /* parse the command line arguments */
+   parse_args(argc, argv);
+
+   if(mynod == 0)
+   {
+
+      fd = open(opt_file, O_WRONLY|O_TRUNC|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP);
+      if(fd<0)
+      {
+         perror("open");
+         return(-1);
+      }
+
+      /* cycle through a range of unique write access sizes */
+      for(i=1; i<128; i++)
+      {
+         ret = write(fd, buffer, i);
+         if(ret < 0)
+         {
+            perror("write");
+            return(-1);
+         }
+         if(ret != i)
+         {
+            fprintf(stderr, "Short write: %d\n", ret);
+            return(-1);
+         }
+      }
+
+      close(fd);
+
+   }
+   MPI_Finalize();
+   return(0);
+}
+
+static int parse_args(int argc, char **argv)
+{
+   int c;
+   
+   while ((c = getopt(argc, argv, "f:")) != EOF) {
+      switch (c) {
+         case 'f': /* filename */
+            strncpy(opt_file, optarg, 255);
+            break;
+         case '?': /* unknown */
+            if (mynod == 0)
+                usage();
+            exit(1);
+         default:
+            break;
+      }
+   }
+   return(0);
+}
+
+static void usage(void)
+{
+    printf("Usage: stdio-test [<OPTIONS>...]\n");
+    printf("\n<OPTIONS> is one of\n");
+    printf(" -f       filename [default: test.out]\n");
+    printf(" -h       print this help\n");
+}
+
+/*
+ * Local variables:
+ *  c-indent-level: 3
+ *  c-basic-offset: 3
+ *  tab-width: 3
+ *
+ * vim: ts=3
+ * End:
+ */ 
+
+