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>

*** 39,48 ****
--- 39,50 ----
  #include <signal.h>
  #include <sys/types.h>
  #include <sys/time.h>
  #include <signal.h>
  #include <libproc.h>
+ #include <limits.h>
+ #include "ptools_common.h"
  
  static  int     look(pid_t);
  static  void    hr_min_sec(char *, long);
  static  void    prtime(char *, timestruc_t *);
  static  int     perr(const char *);
*** 187,197 ****
  }
  
  static int
  look(pid_t pid)
  {
!         char pathname[100];
          int rval = 0;
          int fd;
          psinfo_t psinfo;
          prusage_t prusage;
          timestruc_t real, user, sys;
--- 189,199 ----
  }
  
  static int
  look(pid_t pid)
  {
!         char pathname[PATH_MAX];
          int rval = 0;
          int fd;
          psinfo_t psinfo;
          prusage_t prusage;
          timestruc_t real, user, sys;
*** 201,211 ****
          pfirst++;
  
          if (proc_get_psinfo(pid, &psinfo) < 0)
                  return (perr("read psinfo"));
  
!         (void) sprintf(pathname, "/proc/%d/usage", (int)pid);
          if ((fd = open(pathname, O_RDONLY)) < 0)
                  return (perr("open usage"));
  
          if (read(fd, &prusage, sizeof (prusage)) != sizeof (prusage))
                  rval = perr("read usage");
--- 203,214 ----
          pfirst++;
  
          if (proc_get_psinfo(pid, &psinfo) < 0)
                  return (perr("read psinfo"));
  
!         (void) proc_snprintf(pathname, sizeof (pathname), "/proc/%d/usage",
!             (int)pid);
          if ((fd = open(pathname, O_RDONLY)) < 0)
                  return (perr("open usage"));
  
          if (read(fd, &prusage, sizeof (prusage)) != sizeof (prusage))
                  rval = perr("read usage");