1#!/usr/bin/ksh93 2 3# 4# CDDL HEADER START 5# 6# The contents of this file are subject to the terms of the 7# Common Development and Distribution License (the "License"). 8# You may not use this file except in compliance with the License. 9# 10# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 11# or http://www.opensolaris.org/os/licensing. 12# See the License for the specific language governing permissions 13# and limitations under the License. 14# 15# When distributing Covered Code, include this CDDL HEADER in each 16# file and include the License file at usr/src/OPENSOLARIS.LICENSE. 17# If applicable, add the following below this CDDL HEADER, with the 18# fields enclosed by brackets "[]" replaced with your own identifying 19# information: Portions Copyright [yyyy] [name of copyright owner] 20# 21# CDDL HEADER END 22# 23 24# 25# Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. 26# 27 28# Solaris needs /usr/xpg6/bin:/usr/xpg4/bin because the tools in /usr/bin are not POSIX-conformant 29export PATH=/usr/xpg6/bin:/usr/xpg4/bin:/bin:/usr/bin 30 31# Make sure all math stuff runs in the "C" locale to avoid problems 32# with alternative # radix point representations (e.g. ',' instead of 33# '.' in de_DE.*-locales). This needs to be set _before_ any 34# floating-point constants are defined in this script). 35if [[ "${LC_ALL}" != "" ]] ; then 36 export \ 37 LC_MONETARY="${LC_ALL}" \ 38 LC_MESSAGES="${LC_ALL}" \ 39 LC_COLLATE="${LC_ALL}" \ 40 LC_CTYPE="${LC_ALL}" 41 unset LC_ALL 42fi 43export LC_NUMERIC=C 44 45function fatal_error 46{ 47 print -u 2 "${progname}: $@" 48 exit 1 49} 50 51 52function usage 53{ 54 OPTIND=0 55 getopts -a "${progname}" "${multifollow_usage}" OPT '-?' 56 exit 2 57} 58 59# program start 60builtin basename 61builtin cat 62 63typeset progname="$(basename "${0}")" 64 65typeset -r multifollow_usage=$'+ 66[-?\n@(#)\$Id: multifollow (Roland Mainz) 2009-04-08 \$\n] 67[-author?Roland Mainz <roland.mainz@nrubsig.org>] 68[+NAME?multifollow - use tail -f on multiple files] 69[+DESCRIPTION?\bmultifollow\b is a small utilty which can "follow" multiple 70 files similar to tail -f.] 71 72[ file ... ] 73 74[+SEE ALSO?\bksh93\b(1), \btail\b(1)] 75' 76 77while getopts -a "${progname}" "${multifollow_usage}" OPT ; do 78# printmsg "## OPT=|${OPT}|, OPTARG=|${OPTARG}|" 79 case ${OPT} in 80 *) usage ;; 81 esac 82done 83shift $((OPTIND-1)) 84 85# expecting at least one more arguments 86(($# >= 1)) || usage 87 88builtin -f libshell.so.1 poll || fatal_error "poll builtin not found." 89 90typeset -a files 91integer numfiles=0 92integer i 93 94# register trap to cleanup child processes 95trap 'for ((i=0 ; i < numfiles ; i++ )) ; do kill -TERM ${files[i].childpid} ; done' EXIT 96 97# setup "tail -f" childs, FIFOs and information for the "poll" builtin 98for (( ; $# > 0 ; numfiles++ )) ; do 99 typeset files[${numfiles}]=( 100 typeset name="$1" 101 typeset pipename="/tmp/multifollow_pipe_${PPID}_$$_${numfiles}" 102 integer childpid=-1 103 104 # poll(1) information 105 integer fd="-1" 106 typeset events="POLLIN" 107 typeset revents="" 108 ) 109 110 mkfifo "${files[${numfiles}].pipename}" 111 redirect {files[numfiles].fd}<> "${files[numfiles].pipename}" 112 113 tail -f "${files[${numfiles}].name}" >"${files[${numfiles}].pipename}" & 114 files[${numfiles}].childpid=$! 115 116 rm "${files[${numfiles}].pipename}" 117 118 shift 119done 120 121typeset do_poll=true 122 123# event loop 124while true ; do 125 if ${do_poll} ; then 126 for ((i=0 ; i < numfiles ; i++ )) ; do 127 files[i].revents="" 128 done 129 poll files 130 fi 131 do_poll=true 132 133 for ((i=0 ; i < numfiles ; i++ )) ; do 134 if [[ "${files[i].revents}" != "" ]] ; then 135 # todo: investigate why we have to use "do_poll" at all - AFAIK it 136 # should be sufficient to call "poll" and get "revents" set if there 137 # are any remaining data... 138 if read -t0 -u${files[i].fd} line ; then 139 print -- "#${i}: ${line}" 140 do_poll=false 141 fi 142 fi 143 done 144done 145 146fatal_error "not reached." 147# EOF. 148