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#compdef fuser

local -a args argf variant
typeset -A opt_args

args=(
  '-u[append the user name of the process owner to each PID]'
  '(-f)-c[list all processes accessing files on the filesystem specified by name]'
  '(-c)-f[list all processes accessing named files]'
)
argf=( '*:file:_files' )

_pick_variant -r variant psmisc='(#i)psmisc' $OSTYPE -V
case $variant in
  psmisc)
  (( $+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
  }

    args+=(
      '(-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 -u -v)-s[silent operation]' \
      '-v[verbose mode]' \
      '-V[display version information]' \
      '-4[search only for IPv4 sockets]' \
      '-6[search only for IPv6 sockets]' \
    )
    argf=( '*:name: _alternative "files:file:_files" "services:service:_fuser_services"' )
    [[ -prefix -  && -z ${${words[1,CURRENT-1]}[(r)-[A-Z][A-Z]*]} ]] &&
        argf[1]+=' "signals:signal:_signals -P-"'
  ;;
  freebsd*|openbsd*|solaris2.<9->)
    args+=(
      '-s[send alternate signal]:signal:_signals'
      '-k[send SIGKILL to each process]'
    )
  ;|
  openbsd*|freebsd*)
    args+=(
      '-M[extra values from specified core file]:core file:_files'
      '-N[extract name list from specified system]:system'
    )
  ;|
  freebsd*) args+=( '-m[include mapped files]' ) ;;
  solaris2.<9->)
    args+=(
      '-n[list only processes with non-blocking mandatory locks]'
    )
  ;;
  solaris2.<10->)
    args+=( '-d[report device usage for all minor nodes bound to same device]' )
  ;;
  sysv4 )
    (( $+words[(r)-k] )) && argf=( ':name: _alternative signals\:signal\:_signals\ -p files:file:_files' )
  ;;
esac

_arguments -s $args $argf