1*8462SApril.Chin@Sun.COM#!/usr/bin/ksh93 2*8462SApril.Chin@Sun.COM 3*8462SApril.Chin@Sun.COM# 4*8462SApril.Chin@Sun.COM# CDDL HEADER START 5*8462SApril.Chin@Sun.COM# 6*8462SApril.Chin@Sun.COM# The contents of this file are subject to the terms of the 7*8462SApril.Chin@Sun.COM# Common Development and Distribution License (the "License"). 8*8462SApril.Chin@Sun.COM# You may not use this file except in compliance with the License. 9*8462SApril.Chin@Sun.COM# 10*8462SApril.Chin@Sun.COM# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 11*8462SApril.Chin@Sun.COM# or http://www.opensolaris.org/os/licensing. 12*8462SApril.Chin@Sun.COM# See the License for the specific language governing permissions 13*8462SApril.Chin@Sun.COM# and limitations under the License. 14*8462SApril.Chin@Sun.COM# 15*8462SApril.Chin@Sun.COM# When distributing Covered Code, include this CDDL HEADER in each 16*8462SApril.Chin@Sun.COM# file and include the License file at usr/src/OPENSOLARIS.LICENSE. 17*8462SApril.Chin@Sun.COM# If applicable, add the following below this CDDL HEADER, with the 18*8462SApril.Chin@Sun.COM# fields enclosed by brackets "[]" replaced with your own identifying 19*8462SApril.Chin@Sun.COM# information: Portions Copyright [yyyy] [name of copyright owner] 20*8462SApril.Chin@Sun.COM# 21*8462SApril.Chin@Sun.COM# CDDL HEADER END 22*8462SApril.Chin@Sun.COM# 23*8462SApril.Chin@Sun.COM 24*8462SApril.Chin@Sun.COM# 25*8462SApril.Chin@Sun.COM# Copyright 2008 Sun Microsystems, Inc. All rights reserved. 26*8462SApril.Chin@Sun.COM# Use is subject to license terms. 27*8462SApril.Chin@Sun.COM# 28*8462SApril.Chin@Sun.COM 29*8462SApril.Chin@Sun.COM# Solaris needs /usr/xpg6/bin:/usr/xpg4/bin because the tools in /usr/bin are not POSIX-conformant 30*8462SApril.Chin@Sun.COMexport PATH=/usr/xpg6/bin:/usr/xpg4/bin:/bin:/usr/bin 31*8462SApril.Chin@Sun.COM 32*8462SApril.Chin@Sun.COM# Make sure all math stuff runs in the "C" locale to avoid problems 33*8462SApril.Chin@Sun.COM# with alternative # radix point representations (e.g. ',' instead of 34*8462SApril.Chin@Sun.COM# '.' in de_DE.*-locales). This needs to be set _before_ any 35*8462SApril.Chin@Sun.COM# floating-point constants are defined in this script). 36*8462SApril.Chin@Sun.COMif [[ "${LC_ALL}" != "" ]] ; then 37*8462SApril.Chin@Sun.COM export \ 38*8462SApril.Chin@Sun.COM LC_MONETARY="${LC_ALL}" \ 39*8462SApril.Chin@Sun.COM LC_MESSAGES="${LC_ALL}" \ 40*8462SApril.Chin@Sun.COM LC_COLLATE="${LC_ALL}" \ 41*8462SApril.Chin@Sun.COM LC_CTYPE="${LC_ALL}" 42*8462SApril.Chin@Sun.COM unset LC_ALL 43*8462SApril.Chin@Sun.COMfi 44*8462SApril.Chin@Sun.COMexport LC_NUMERIC=C 45*8462SApril.Chin@Sun.COM 46*8462SApril.Chin@Sun.COMfunction fatal_error 47*8462SApril.Chin@Sun.COM{ 48*8462SApril.Chin@Sun.COM print -u 2 "${progname}: $@" 49*8462SApril.Chin@Sun.COM exit 1 50*8462SApril.Chin@Sun.COM} 51*8462SApril.Chin@Sun.COM 52*8462SApril.Chin@Sun.COM 53*8462SApril.Chin@Sun.COMfunction usage 54*8462SApril.Chin@Sun.COM{ 55*8462SApril.Chin@Sun.COM OPTIND=0 56*8462SApril.Chin@Sun.COM getopts -a "${progname}" "${multifollow_usage}" OPT '-?' 57*8462SApril.Chin@Sun.COM exit 2 58*8462SApril.Chin@Sun.COM} 59*8462SApril.Chin@Sun.COM 60*8462SApril.Chin@Sun.COM# program start 61*8462SApril.Chin@Sun.COMbuiltin basename 62*8462SApril.Chin@Sun.COMbuiltin cat 63*8462SApril.Chin@Sun.COM 64*8462SApril.Chin@Sun.COMtypeset progname="$(basename "${0}")" 65*8462SApril.Chin@Sun.COM 66*8462SApril.Chin@Sun.COMtypeset -r multifollow_usage=$'+ 67*8462SApril.Chin@Sun.COM[-?\n@(#)\$Id: multifollow (Roland Mainz) 2008-10-14 \$\n] 68*8462SApril.Chin@Sun.COM[-author?Roland Mainz <roland.mainz@nrubsig.org>] 69*8462SApril.Chin@Sun.COM[+NAME?multifollow - use tail -f on multiple files] 70*8462SApril.Chin@Sun.COM[+DESCRIPTION?\bmultifollow\b is a small utilty which can "follow" multiple 71*8462SApril.Chin@Sun.COM files similar to tail -f.] 72*8462SApril.Chin@Sun.COM 73*8462SApril.Chin@Sun.COM[ file ... ] 74*8462SApril.Chin@Sun.COM 75*8462SApril.Chin@Sun.COM[+SEE ALSO?\bksh93\b(1), \btail\b(1)] 76*8462SApril.Chin@Sun.COM' 77*8462SApril.Chin@Sun.COM 78*8462SApril.Chin@Sun.COMwhile getopts -a "${progname}" "${multifollow_usage}" OPT ; do 79*8462SApril.Chin@Sun.COM# printmsg "## OPT=|${OPT}|, OPTARG=|${OPTARG}|" 80*8462SApril.Chin@Sun.COM case ${OPT} in 81*8462SApril.Chin@Sun.COM *) usage ;; 82*8462SApril.Chin@Sun.COM esac 83*8462SApril.Chin@Sun.COMdone 84*8462SApril.Chin@Sun.COMshift $((OPTIND-1)) 85*8462SApril.Chin@Sun.COM 86*8462SApril.Chin@Sun.COM# expecting at least one more arguments 87*8462SApril.Chin@Sun.COM(($# >= 1)) || usage 88*8462SApril.Chin@Sun.COM 89*8462SApril.Chin@Sun.COMbuiltin -f libshell.so.1 poll || fatal_error "poll builtin not found." 90*8462SApril.Chin@Sun.COM 91*8462SApril.Chin@Sun.COMtypeset -a files 92*8462SApril.Chin@Sun.COMinteger numfiles=0 93*8462SApril.Chin@Sun.COMinteger i 94*8462SApril.Chin@Sun.COM 95*8462SApril.Chin@Sun.COM# register trap to cleanup child processes 96*8462SApril.Chin@Sun.COMtrap 'for ((i=0 ; i < numfiles ; i++ )) ; do kill -TERM ${files[i].childpid} ; done' EXIT 97*8462SApril.Chin@Sun.COM 98*8462SApril.Chin@Sun.COM# setup "tail -f" childs, FIFOs and information for the "poll" builtin 99*8462SApril.Chin@Sun.COMfor (( ; $# > 0 ; numfiles++ )) ; do 100*8462SApril.Chin@Sun.COM typeset files[${numfiles}]=( 101*8462SApril.Chin@Sun.COM typeset name="$1" 102*8462SApril.Chin@Sun.COM typeset pipename="/tmp/multifollow_pipe_${PPID}_$$_${numfiles}" 103*8462SApril.Chin@Sun.COM integer childpid=-1 104*8462SApril.Chin@Sun.COM 105*8462SApril.Chin@Sun.COM # poll(1) information 106*8462SApril.Chin@Sun.COM integer fd="-1" 107*8462SApril.Chin@Sun.COM typeset events="POLLIN" 108*8462SApril.Chin@Sun.COM typeset revents="" 109*8462SApril.Chin@Sun.COM ) 110*8462SApril.Chin@Sun.COM 111*8462SApril.Chin@Sun.COM mkfifo "${files[${numfiles}].pipename}" 112*8462SApril.Chin@Sun.COM redirect {files[numfiles].fd}<>"${files[numfiles].pipename}" 113*8462SApril.Chin@Sun.COM 114*8462SApril.Chin@Sun.COM tail -f "${files[${numfiles}].name}" >"${files[${numfiles}].pipename}" & 115*8462SApril.Chin@Sun.COM files[${numfiles}].childpid=$! 116*8462SApril.Chin@Sun.COM 117*8462SApril.Chin@Sun.COM rm "${files[${numfiles}].pipename}" 118*8462SApril.Chin@Sun.COM 119*8462SApril.Chin@Sun.COM shift 120*8462SApril.Chin@Sun.COMdone 121*8462SApril.Chin@Sun.COM 122*8462SApril.Chin@Sun.COMtypeset do_poll=true 123*8462SApril.Chin@Sun.COM 124*8462SApril.Chin@Sun.COM# event loop 125*8462SApril.Chin@Sun.COMwhile true ; do 126*8462SApril.Chin@Sun.COM if ${do_poll} ; then 127*8462SApril.Chin@Sun.COM for ((i=0 ; i < numfiles ; i++ )) ; do 128*8462SApril.Chin@Sun.COM files[i].revents="" 129*8462SApril.Chin@Sun.COM done 130*8462SApril.Chin@Sun.COM poll files 131*8462SApril.Chin@Sun.COM fi 132*8462SApril.Chin@Sun.COM do_poll=true 133*8462SApril.Chin@Sun.COM 134*8462SApril.Chin@Sun.COM for ((i=0 ; i < numfiles ; i++ )) ; do 135*8462SApril.Chin@Sun.COM if [[ "${files[i].revents}" != "" ]] ; then 136*8462SApril.Chin@Sun.COM # todo: investigate why we have to use "do_poll" at all - AFAIK it 137*8462SApril.Chin@Sun.COM # should be sufficient to call "poll" and get "revents" set if there 138*8462SApril.Chin@Sun.COM # are any remaining data... 139*8462SApril.Chin@Sun.COM if read -t0 -u${files[i].fd} line ; then 140*8462SApril.Chin@Sun.COM print -- "#${i}: ${line}" 141*8462SApril.Chin@Sun.COM do_poll=false 142*8462SApril.Chin@Sun.COM fi 143*8462SApril.Chin@Sun.COM fi 144*8462SApril.Chin@Sun.COM done 145*8462SApril.Chin@Sun.COMdone 146*8462SApril.Chin@Sun.COM 147*8462SApril.Chin@Sun.COMfatal_error "not reached." 148*8462SApril.Chin@Sun.COM# EOF. 149