1#!/usr/pkg/bin/perl 2# 3# errinfo - report on syscall failures and print errno error messages. 4# Written using Perl and DTrace (Solaris 10 03/05) 5# 6# When system calls fail, an errno variable is set to convay a meaningful 7# message to the end user - so long as the program does something with it 8# (eg, "ls" printing "No such file or directory"). This program fetches 9# and prints details for all syscall failures along with their message, 10# whether the failing program is already printing this info or not. 11# 12# $Id: errinfo,v 1.2 2016/12/12 16:30:03 christos Exp $ 13# 14# USAGE: errinfo [-ch] [-p PID] [-n name] 15# 16# -c # counts - aggregate style 17# -p PID # examine this PID only 18# -n name # examine processes with this name only 19# eg, 20# errinfo # default output - snoop event style 21# errinfo -n ssh # examine "ssh" processes only 22# errinfo -cn ssh # examine "ssh" using counts 23# 24# FIELDS: 25# EXEC Program name (truncated) 26# SYSCALL System call name 27# ERR Value of errno 28# DESC Description of errno message 29# 30# SEE ALSO: /usr/include/sys/errno.h 31# 32# COPYRIGHT: Copyright (c) 2005, 2006 Brendan Gregg. 33# 34# CDDL HEADER START 35# 36# The contents of this file are subject to the terms of the 37# Common Development and Distribution License, Version 1.0 only 38# (the "License"). You may not use this file except in compliance 39# with the License. 40# 41# You can obtain a copy of the license at Docs/cddl1.txt 42# or http://www.opensolaris.org/os/licensing. 43# See the License for the specific language governing permissions 44# and limitations under the License. 45# 46# CDDL HEADER END 47# 48# Author: Brendan Gregg [Sydney, Australia] 49# 50# 18-Apr-2005 Brendan Gregg Created this. 51# 20-Apr-2006 " " Last update. 52# 53 54use Getopt::Std; 55 56# 57# Defaults 58# 59$FILTER = ""; 60$COUNT = 0; 61 62# 63# Command line arguments 64# 65&Usage() if $ARGV[0] eq "--help"; 66getopts('ch:n:p:') || &Usage(); 67&Usage() if $opt_h; 68$COUNT = 1 if $opt_c; 69$FILTER = "&& execname == \"$opt_n\"" if defined $opt_n; 70$FILTER = "&& pid == $opt_p" if defined $opt_p; 71 72# 73# Load errno descriptions 74# 75open(ERRNO,"/usr/include/sys/errno.h") || die "ERROR1: reading errno.h: $!\n"; 76while (chomp($line = <ERRNO>)) { 77 next unless $line =~ /^#define/; 78 ($errno,$desc) = $line =~ /^#define\s+\S+\s+(\d+)\s+\/\*(.*)\*\//; 79 $Errno{$errno} = $desc; 80} 81close ERRNO; 82 83# 84# Declare DTrace script 85# 86 if ($COUNT) { # aggregate style 87$dtrace = <<END; 88/usr/sbin/dtrace -n ' 89 #pragma D option quiet 90 syscall:::return 91 /errno != 0 && pid != \$pid $FILTER/ 92 { 93 \@Errs[execname, probefunc, errno] = count(); 94 } 95 dtrace:::END { 96 printa("%s %s %d %\@d\\n", \@Errs); 97 }' 98END 99 } else { # snoop style 100$dtrace = <<END; 101/usr/sbin/dtrace -n ' 102 #pragma D option quiet 103 #pragma D option switchrate=5hz 104 syscall:::return 105 /errno != 0 && pid != \$pid $FILTER/ 106 { 107 printf("%s %s %d\\n", execname, probefunc, errno); 108 }' 109END 110 } 111 112# 113# Cleanup on signals 114# 115$SIG{INT} = \&Cleanup_Signal; # Ctrl-C 116$SIG{QUIT} = \&Cleanup_Signal; # Ctrl-\ 117$SIG{TERM} = \&Cleanup_Signal; # TERM 118 119# 120# Run DTrace, process output 121# 122 123if ($COUNT) { 124 print STDERR "Tracing... Hit Ctrl-C to end.\n"; 125 $header = 1; 126} else { 127 printf("%16s %16s %4s %s\n","EXEC","SYSCALL","ERR","DESC"); 128} 129 130### Open DTrace 131open(DTRACE,"$dtrace |") || die "ERROR2: Can't start dtrace (perms?): $!\n"; 132 133### Process DTrace output 134while (chomp($line = <DTRACE>)) { 135 136 ### Print count header 137 if ($COUNT && $header) { 138 printf("\n%16s %16s %4s %6s %s\n", 139 "EXEC","SYSCALL","ERR","COUNT","DESC"); 140 $header = 0; 141 } 142 143 ### Split data 144 ($execname,$syscall,$errno,$counts) = split(' ',$line); 145 next if $errno eq ""; 146 147 ### Fetch errno description 148 $desc = $Errno{$errno}; 149 150 ### Print output line 151 if ($COUNT) { 152 printf("%16s %16s %4d %6d %s\n", 153 $execname,$syscall,$errno,$counts,$desc); 154 } else { 155 printf("%16s %16s %4d %s\n",$execname,$syscall,$errno,$desc); 156 } 157} 158close(DTRACE); 159 160# 161# Triggered by signals 162# 163sub Cleanup_Signal { 164} 165 166# 167# Usage message 168# 169sub Usage { 170 print STDERR "USAGE: errinfo [-ch] [-p PID] [-n name]\n"; 171 print STDERR <<ENDUSAGE; 172 eg, 173 errinfo # default output - snoop event style 174 -c # counts - aggregate style 175 -p 871 # examine PID 871 only 176 -n ssh # examine processes with the name "ssh" only 177 -cn ssh # examine "ssh" using counts 178ENDUSAGE 179 exit(1); 180} 181