diff -rc kvm-57-orig/qemu/vl.c kvm-57/qemu/vl.c
*** kvm-57-orig/qemu/vl.c	2007-12-18 16:57:46.000000000 +0100
--- kvm-57/qemu/vl.c	2008-08-26 13:01:39.000000000 +0200
***************
*** 3828,3838 ****
          slirp_init();
      }
  
!     /* XXX: better tmp dir construction */
!     snprintf(smb_dir, sizeof(smb_dir), "/tmp/qemu-smb.%d", getpid());
!     if (mkdir(smb_dir, 0700) < 0) {
!         fprintf(stderr, "qemu: could not create samba server dir '%s'\n", smb_dir);
!         exit(1);
      }
      snprintf(smb_conf, sizeof(smb_conf), "%s/%s", smb_dir, "smb.conf");
  
--- 3828,3840 ----
          slirp_init();
      }
  
!     while (1) {
!         snprintf(smb_dir, sizeof(smb_dir), "/tmp/qemu-smb.%d.%d", getpid(), random());
!         if (mkdir(smb_dir, 0700) == 0) break;
!         if (errno != EEXIST) {
!             fprintf(stderr, "qemu: could not create samba server dir '%s'\n", smb_dir);
!             exit(1);
!         }
      }
      snprintf(smb_conf, sizeof(smb_conf), "%s/%s", smb_dir, "smb.conf");
  
***************
*** 3865,3872 ****
      fclose(f);
      atexit(smb_exit);
  
      snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -s %s",
!              SMBD_COMMAND, smb_conf);
  
      slirp_add_exec(0, smb_cmdline, 4, 139);
  }
--- 3867,3877 ----
      fclose(f);
      atexit(smb_exit);
  
+     char *smbd_command = getenv("QEMU_SMBD_COMMAND");
+     if (!smbd_command) smbd_command = SMBD_COMMAND;
+ 
      snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -s %s",
!              smbd_command, smb_conf);
  
      slirp_add_exec(0, smb_cmdline, 4, 139);
  }
Only in kvm-57/qemu: vl.c~