lastwords revision 235368
1235368Sgnn#!/usr/bin/ksh 2235368Sgnn# 3235368Sgnn# lastwords - print last few syscalls for dying processes. 4235368Sgnn# Written using DTrace (Solaris 10 3/05). 5235368Sgnn# 6235368Sgnn# $Id: lastwords 3 2007-08-01 10:50:08Z brendan $ 7235368Sgnn# 8235368Sgnn# This prints the last few system calls for processes matching 9235368Sgnn# the given name, when they exit. This makes use of a ring buffer 10235368Sgnn# so that the impact on the system is minimised. 11235368Sgnn# 12235368Sgnn# USAGE: lastwords command 13235368Sgnn# eg, 14235368Sgnn# lastwords netscape 15235368Sgnn# 16235368Sgnn# FIELDS: 17235368Sgnn# TIME Time of syscall return, ns 18235368Sgnn# PID Process ID 19235368Sgnn# EXEC Process name (execname) 20235368Sgnn# SYSCALL System call 21235368Sgnn# RETURN Return value for system call 22235368Sgnn# ERR errno for system call 23235368Sgnn# 24235368Sgnn# BASED ON: /usr/demo/dtrace/ring.d 25235368Sgnn# 26235368Sgnn# SEE ALSO: DTrace Guide "Buffers and Buffering" chapter (docs.sun.com) 27235368Sgnn# dtruss (DTraceToolkit) 28235368Sgnn# 29235368Sgnn# PORTIONS: Copyright (c) 2005, 2006 Brendan Gregg. 30235368Sgnn# 31235368Sgnn# CDDL HEADER START 32235368Sgnn# 33235368Sgnn# The contents of this file are subject to the terms of the 34235368Sgnn# Common Development and Distribution License, Version 1.0 only 35235368Sgnn# (the "License"). You may not use this file except in compliance 36235368Sgnn# with the License. 37235368Sgnn# 38235368Sgnn# You can obtain a copy of the license at Docs/cddl1.txt 39235368Sgnn# or http://www.opensolaris.org/os/licensing. 40235368Sgnn# See the License for the specific language governing permissions 41235368Sgnn# and limitations under the License. 42235368Sgnn# 43235368Sgnn# CDDL HEADER END 44235368Sgnn# 45235368Sgnn# 09-Jun-2005 Brendan Gregg Created this. 46235368Sgnn# 20-Apr-2006 " " Last update. 47235368Sgnn# 48235368Sgnn 49235368Sgnn### Usage 50235368Sgnnfunction usage 51235368Sgnn{ 52235368Sgnn cat <<-END >&2 53235368Sgnn USAGE: lastwords command 54235368Sgnn eg, 55235368Sgnn lastwords netscape 56235368Sgnn END 57235368Sgnn exit 1 58235368Sgnn} 59235368Sgnn 60235368Sgnn### Process arguments 61235368Sgnnif (( $# != 1 )); then 62235368Sgnn usage 63235368Sgnnfi 64235368Sgnncommand=$1 65235368Sgnn 66235368Sgnnprint "Tracing... Waiting for $command to exit..." 67235368Sgnn 68235368Sgnn### Run DTrace 69235368Sgnn/usr/sbin/dtrace -n ' 70235368Sgnn #pragma D option quiet 71235368Sgnn #pragma D option bufpolicy=ring 72235368Sgnn #pragma D option bufsize=16k 73235368Sgnn 74235368Sgnn syscall:::return 75235368Sgnn /execname == $$1/ 76235368Sgnn { 77235368Sgnn /* buffer syscall details */ 78235368Sgnn printf("%-18d %5d %12s %12s %10x %3d\n", 79235368Sgnn timestamp,pid,execname,probefunc,(int)arg0,errno); 80235368Sgnn } 81235368Sgnn 82235368Sgnn proc::proc_exit:exit 83235368Sgnn /execname == $$1/ 84235368Sgnn { 85235368Sgnn /* print, erm, footer */ 86235368Sgnn printf("%-18s %5s %12s %12s %10s %3s\n", 87235368Sgnn "TIME","PID","EXEC","SYSCALL","RETURN","ERR"); 88235368Sgnn exit(0); 89235368Sgnn } 90235368Sgnn' "$command" 91