1#!/usr/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# 20-Apr-2006, ver 0.83 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# 52 53use Getopt::Std; 54 55# 56# Defaults 57# 58$FILTER = ""; 59$COUNT = 0; 60 61# 62# Command line arguments 63# 64&Usage() if $ARGV[0] eq "--help"; 65getopts('ch:n:p:') || &Usage(); 66&Usage() if $opt_h; 67$COUNT = 1 if $opt_c; 68$FILTER = "&& (execname == strstr(execname,\"$opt_n\")) || (\"$opt_n\" == strstr(\"$opt_n\",execname))" if defined $opt_n; 69$FILTER = "&& pid == $opt_p" if defined $opt_p; 70 71# 72# Load errno descriptions 73# 74open(ERRNO,"/usr/include/sys/errno.h") || die "ERROR1: reading errno.h: $!\n"; 75while (chomp($line = <ERRNO>)) { 76 next unless $line =~ /^#define/; 77 ($errno,$desc) = $line =~ /^#define\s+\S+\s+(\d+)\s+\/\*(.*)\*\//; 78 $Errno{$errno} = $desc; 79} 80close ERRNO; 81 82# 83# Declare DTrace script 84# 85 if ($COUNT) { # aggregate style 86$dtrace = <<END; 87/usr/sbin/dtrace -n ' 88 #pragma D option quiet 89 syscall:::return 90 /errno != 0 && pid != \$pid $FILTER/ 91 { 92 \@Errs[execname, probefunc, errno] = count(); 93 } 94 dtrace:::END { 95 printa("%s %s %d %\@d\\n", \@Errs); 96 }' 97END 98 } else { # snoop style 99$dtrace = <<END; 100/usr/sbin/dtrace -n ' 101 #pragma D option quiet 102 #pragma D option switchrate=5hz 103 syscall:::return 104 /errno != 0 && pid != \$pid $FILTER/ 105 { 106 printf("%s %s %d\\n", execname, probefunc, errno); 107 }' 108END 109 } 110 111# 112# Cleanup on signals 113# 114$SIG{INT} = \&Cleanup_Signal; # Ctrl-C 115$SIG{QUIT} = \&Cleanup_Signal; # Ctrl-\ 116$SIG{TERM} = \&Cleanup_Signal; # TERM 117 118# 119# Run DTrace, process output 120# 121 122if ($COUNT) { 123 print STDERR "Tracing... Hit Ctrl-C to end.\n"; 124 $header = 1; 125} else { 126 printf("%16s %16s %4s %s\n","EXEC","SYSCALL","ERR","DESC"); 127} 128 129### Open DTrace 130open(DTRACE,"$dtrace |") || die "ERROR2: Can't start dtrace (perms?): $!\n"; 131 132### Process DTrace output 133while (chomp($line = <DTRACE>)) { 134 135 ### Print count header 136 if ($COUNT && $header) { 137 printf("\n%16s %16s %4s %6s %s\n", 138 "EXEC","SYSCALL","ERR","COUNT","DESC"); 139 $header = 0; 140 } 141 142 ### Split data 143 ($execname,$syscall,$errno,$counts) = split(' ',$line); 144 next if $errno eq ""; 145 146 ### Fetch errno description 147 $desc = $Errno{$errno}; 148 149 ### Print output line 150 if ($COUNT) { 151 printf("%16s %16s %4d %6d %s\n", 152 $execname,$syscall,$errno,$counts,$desc); 153 } else { 154 printf("%16s %16s %4d %s\n",$execname,$syscall,$errno,$desc); 155 } 156} 157close(DTRACE); 158 159# 160# Triggered by signals 161# 162sub Cleanup_Signal { 163} 164 165# 166# Usage message 167# 168sub Usage { 169 print STDERR "USAGE: errinfo [-ch] [-p PID] [-n name]\n"; 170 print STDERR <<ENDUSAGE; 171 eg, 172 errinfo # default output - snoop event style 173 -c # counts - aggregate style 174 -p 871 # examine PID 871 only 175 -n ssh # examine processes with the name "ssh" only 176 -cn ssh # examine "ssh" using counts 177ENDUSAGE 178 exit(1); 179} 180