OS-3280 need a way to specify the root of a native system in the lx brand
OS-3279 lx brand should allow delegated datasets
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

*** 19,32 ****
   * CDDL HEADER END
   */
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  #include <stdio.h>
  #include <stdio_ext.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <ctype.h>
--- 19,31 ----
   * CDDL HEADER END
   */
  /*
   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
+  * Copyright (c) 2014, Joyent, Inc.  All rights reserved.
   */
  
  #include <stdio.h>
  #include <stdio_ext.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <ctype.h>
*** 35,44 ****
--- 34,44 ----
  #include <signal.h>
  #include <stddef.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <libproc.h>
+ #include "ptools_common.h"
  
  /* evil knowledge of libc internals */
  #include "../../../lib/libc/inc/thr_uberdata.h"
  
  #define MAX_SYMNAMLEN   1024    /* Recommended max symbol name length */
*** 170,180 ****
  }
  
  static int
  look(char *arg)
  {
!         char pathname[100];
          struct stat statb;
          int fd = -1;
          int sig, gcode;
          sigset_t holdmask;
          int maxsig;
--- 170,180 ----
  }
  
  static int
  look(char *arg)
  {
!         char pathname[PATH_MAX];
          struct stat statb;
          int fd = -1;
          int sig, gcode;
          sigset_t holdmask;
          int maxsig;
*** 197,207 ****
                  goto look_error;
          }
          (void) memcpy(&psinfo, psinfop, sizeof (psinfo_t));
          proc_unctrl_psinfo(&psinfo);
  
!         (void) sprintf(pathname, "/proc/%d/sigact", (int)psinfo.pr_pid);
          if ((fd = open(pathname, O_RDONLY)) < 0) {
                  perr("open sigact");
                  goto look_error;
          }
  
--- 197,208 ----
                  goto look_error;
          }
          (void) memcpy(&psinfo, psinfop, sizeof (psinfo_t));
          proc_unctrl_psinfo(&psinfo);
  
!         (void) proc_snprintf(pathname, sizeof (pathname), "/proc/%d/sigact",
!             (int)psinfo.pr_pid);
          if ((fd = open(pathname, O_RDONLY)) < 0) {
                  perr("open sigact");
                  goto look_error;
          }