# /usr/bin/truss -efal -vall ifconfig ste0 plumb
  .....
  .....
  607/1:          so_socket(PF_INET, SOCK_DGRAM, IPPROTO_IP, "", SOV_XPG4_2) = 3
  607/1:          open("/dev/ste0", O_RDWR)                       Err#2 ENOENT
  607/1:          open("/dev/ste", O_RDWR)                        = 4
  607/1:          putmsg(4, 0xFFBFF318, 0x00000000, 0x0009)       = 0
  607/1:                  ctl:  maxlen=0    len=4    buf=0xFFBFF324: "\0\0\0\0"
  607/1:          pollsys(0xFFBFF2A8, 1, 0xFFBFEE40, 0x00000000)  = 1
  607/1:                  fd=4  ev=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND rev=POLLPRI
  607/1:                  timeout: 60.000000000 sec
  607/1:          getmsg(4, 0xFFBFF318, 0x00000000, 0xFFBFF314)   = 0
  607/1:                  ctl:  maxlen=1024 len=90   buf=0xFFBFF328: "\0\0\003\0\005DC"..
  607/1:                  flags:  0x0001
  607/1:          ioctl(4, I_PUSH, "ip")                          = 0
  607/1:          ioctl(4, SIOCGLIFFLAGS, 0x00052C58)             = 0
  ~                write/read (struct lifreq)
                  write/read (struct lifreq)
  607/1:          ioctl(4, I_PUSH, "arp")                         = 0
  607/1:          ioctl(4, SIOCSLIFNAME, 0x00052C58)              = 0
  ~                write/read (struct lifreq)
                  write/read (struct lifreq)
  607/1:          open("/dev/udp", O_RDWR)                        = 5
  607/1:          ioctl(5, I_POP, 0x00000000)                     = 0
  607/1:          ioctl(5, I_POP, 0x00000000)                     Err#22 EINVAL
  607/1:          ioctl(5, I_PUSH, "arp")                         = 0
  607/1:          open("/dev/ste", O_RDWR)                        = 6
  607/1:          ioctl(6, I_PUSH, "arp")                         = 0
  607/1:          ioctl(6, I_STR, 0xFFBFF848)                     = 0
  607/1:                  cmd=SIOCSLIFNAME timout=0 len=376 dp=0x00052C58
  ~                write/read (struct lifreq)
                  write/read (struct lifreq)
  607/1:          ioctl(5, I_PLINK, 0x00000004)                   = 11
  607/1:          ioctl(5, I_PLINK, 0x00000006)                   = 12
  607/1:          close(6)                                        = 0
  607/1:          close(5)                                        = 0
  607/1:          close(4)                                        = 0
  607/1:          ioctl(3, SIOCGTUNPARAM, 0xFFBFF8B8)             Err#22 EINVAL
  ~                read (struct iftun_req)
                  read (struct iftun_req)
  607/1:          _exit(0)


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