From f07a214d96d23a755b33219c8d96145a6aa62e2a Mon Sep 17 00:00:00 2001
From: Sree Harsha Totakura <totakura@in.tum.de>
Date: Sat, 8 Dec 2012 13:05:37 +0000
Subject: - replacing fork with exec

---
 src/testbed/gnunet_mpi_test.c | 76 +++++++++++++++++++++----------------------
 1 file changed, 37 insertions(+), 39 deletions(-)

(limited to 'src/testbed/gnunet_mpi_test.c')

diff --git a/src/testbed/gnunet_mpi_test.c b/src/testbed/gnunet_mpi_test.c
index 1e1608228..85049abc2 100644
--- a/src/testbed/gnunet_mpi_test.c
+++ b/src/testbed/gnunet_mpi_test.c
@@ -12,8 +12,10 @@ int main (int argc, char *argv[])
 {
   char *msg;
   char *filename;
+  struct GNUNET_OS_Process *proc;
+  unsigned long code;
   pid_t pid;
-  pid_t ppid;
+  enum GNUNET_OS_ProcessStatusType proc_status;
   int ntasks;
   int rank;
   int msg_size;
@@ -21,11 +23,20 @@ int main (int argc, char *argv[])
 
   ret = GNUNET_SYSERR;
   if (MPI_SUCCESS != MPI_Init (&argc, &argv))
+  {
+    GNUNET_break (0);
     return 1;
+  }
   if (MPI_SUCCESS != MPI_Comm_size (MPI_COMM_WORLD, &ntasks))
+  {
+    GNUNET_break (0);
     goto finalize;
+  }
   if (MPI_SUCCESS != MPI_Comm_rank (MPI_COMM_WORLD, &rank))
+  {
+    GNUNET_break (0);
     goto finalize;
+  }
   pid = getpid();
   (void) GNUNET_asprintf (&filename, "%d-%d.mpiout", (int) pid, rank);
   msg_size = GNUNET_asprintf (&msg, "My rank is: %d\n", rank);
@@ -40,57 +51,44 @@ int main (int argc, char *argv[])
   GNUNET_free (filename);
   GNUNET_free (msg);
   if (GNUNET_OK != ret)
+  {
+    GNUNET_break (0);
     goto finalize;
+  }
 
   ret = GNUNET_SYSERR;
-  ppid = pid;
-  pid = fork ();
-  if (-1 == pid)
+  proc = GNUNET_OS_start_process (GNUNET_NO,
+                                  GNUNET_OS_INHERIT_STD_ALL,
+                                  NULL,
+                                  NULL,
+                                  "uptime", NULL);
+  if (NULL == proc)
   {
-    GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "fork");
+    printf ("Cannot exec\n");
     goto finalize;
   }
-  if (0 == pid)
+  do {
+    (void) sleep (1);
+    ret = GNUNET_OS_process_status (proc, &proc_status, &code);
+  } while (GNUNET_NO == ret);
+  GNUNET_assert (GNUNET_NO != ret);
+  if (GNUNET_OK == ret)
   {
-    /* child code */
-    pid = getpid ();
-    (void) GNUNET_asprintf (&filename, "%d-%d.mpiout", (int) pid, rank);
-    msg_size = GNUNET_asprintf (&msg, "Child of %d\n", (int) ppid);
-    printf ("%s", msg);
-    if (msg_size == GNUNET_DISK_fn_write (filename,
-                                        msg, msg_size,
-                                        GNUNET_DISK_PERM_USER_READ
-                                        | GNUNET_DISK_PERM_GROUP_READ
-                                        | GNUNET_DISK_PERM_USER_WRITE
-                                        | GNUNET_DISK_PERM_GROUP_WRITE))
-    ret = GNUNET_OK;
-    GNUNET_free (filename);
-    GNUNET_free (msg);
-    return (GNUNET_OK == ret) ? 0 : 1;
-  }
-  else {
-    int status;
-    int childpid;
-
-    childpid = waitpid (pid, &status, 0);
-    if (childpid != pid)
+    if (0 != code)
     {
+      LOG (GNUNET_ERROR_TYPE_WARNING, "Child terminated abnormally\n");
+      ret = GNUNET_SYSERR;
       GNUNET_break (0);
       goto finalize;
     }
-    if (!WIFEXITED (status))
-    {
-      GNUNET_break (0);
-      goto finalize;
-    }
-    if (0 != WEXITSTATUS (status))
-    {
-      GNUNET_break (0);
-    }
   }
-  ret = GNUNET_OK;
+  else
+    GNUNET_break (0);
 
  finalize:
   (void) MPI_Finalize ();
-  return (GNUNET_OK == ret) ? 0 : 1;
+  if (GNUNET_OK == ret)
+    return 0;
+  printf ("Something went wrong\n");
+  return 1;
 }
-- 
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