get exe and args from /proc/self/cmdline

darshan-runtime/lib/darshan-core.c

@@ -1063,9 +1063,31 @@ static void darshan_get_exe_and_mounts(struct darshan_core_runtime *core,
      */
     if(argc == 0)
     {
-        strncat(core->log_exemnt_p, __progname_full, space_left);
-        space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
-        strncat(core->log_exemnt_p, " <unknown args>", space_left);
+        /* get the name of the executable and the arguments from 
+           /proc/self/cmdline */
+        FILE *fh;
+        int i, ii;
+        char cmdl[DARSHAN_EXE_LEN];
+
+        cmdl[0] = '\0';
+        fh = fopen("/proc/self/cmdline","r");
+        if(fh) {
+            ii = 0;
+            fgets(cmdl,DARSHAN_EXE_LEN,fh);
+            for(i=1;i<DARSHAN_EXE_LEN;i++)  {
+                if(cmdl[i]==0 && ii == 0) {
+                  cmdl[i]=' '; ii = 1;
+                } else if(cmdl[i]==0 && ii == 1) {
+                  break;
+                } else {
+                  ii = 0;
+                }
+            }
+        } else {
+           sprintf(cmdl, " <unknown args>");
+        }
+        fclose(fh);
+        strncat(core->log_exemnt_p, cmdl, space_left);
         space_left = DARSHAN_EXE_LEN-strlen(core->log_exemnt_p);
     }