#compdef fuser

local -a args arg1
typeset -A opt_args

if _pick_variant -c $words[1] psmisc='(#i)psmisc' unix -V; then

  (( $+functions[_fuser_services] )) ||
  _fuser_services() {
    local expl suf ret=1

    [[ $opt_args[-n] = ??p || $EUID = 0 ]] || return

    if compset -P '*/'; then
      _wanted protocols expl protocol compadd tcp udp
    elif compset -P '*,*,'; then
      compset -S '/*' || [[ -n $opt_args[-n] ]] || suf=( -qS / )
      _ports $suf && ret=0
    elif compset -P '*,'; then
      compset -S ',*' || suf=( -S ,  -r "/ \t\n\-" )
      _hosts $suf && ret=0
    else
      compset -S ',*' || suf=( -S ${${opt_args[-n]/?*/,}:-/} -r "/, \t\n\-" )
      _ports $suf && ret=0
    fi
      
    return ret
  }

  _arguments \
    '(-s)-a[show all files specified on the command line]' \
    {-c,-m}'[list all processes accessing files on the filesystem specified by name]' \
    '-k[kill processes accessing the file]' \
    '-i[ask for confirmation before killing]' \
    '-l[list all known signal names]' \
    '-n[select name space]:namespace:(file udp tcp)' \
    '(-a)-s[silent operation]' \
    '-signal[send alternate signal with -k]:signal:_signals' \
    '-u[append the user name of the process owner to each PID]' \
    '-v[verbose mode]' \
    '-V[display version information]' \
    '-4[search only for IPv4 sockets]' \
    '-6[search only for IPv6 sockets]' \
    '*:name: _alternative "files:file:_files" "services:service:_fuser_services"'

else
  case $OSTYPE in
    solaris2.9 )
      args=(
	'-n[list only processes with non-blocking mandatory locks]' 
	'-s[send alternate signal with -k]:signal:_signals' 
      )
    ;;
    sysv4 )
      (( $+words[(r)-k] )) && arg1=( ':name: _alternative signals\:signal\:_signals\ -p files:file:_files' )
    ;;
  esac

  _arguments \
    '(-f)-c[list all processes accessing files on the filesystem specified by name]' \
    '(-c)-f[list all processes accessing named files]' \
    '-k[kill processes accessing the file]' \
    '-u[append the user name of the process owner to each PID]' \
    $args \
    $arg1 \
    '*:file:_files'
fi