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+#!/usr/bin/env bash
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+# Copyright 2009 The Go Authors. All rights reserved.
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+# Use of this source code is governed by a BSD-style
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+# license that can be found in the LICENSE file.
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+
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+# Generate Go code listing errors and other #defined constant
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+# values (ENAMETOOLONG etc.), by asking the preprocessor
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+# about the definitions.
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+
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+unset LANG
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+export LC_ALL=C
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+export LC_CTYPE=C
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+
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+CC=${CC:-gcc}
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+
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+uname=$(uname)
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+
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+includes='
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+#include <sys/types.h>
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+#include <sys/file.h>
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+#include <fcntl.h>
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+#include <dirent.h>
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+#include <sys/socket.h>
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+#include <netinet/in.h>
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+#include <netinet/ip.h>
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+#include <netinet/ip6.h>
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+#include <netinet/tcp.h>
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+#include <errno.h>
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+#include <sys/signal.h>
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+#include <signal.h>
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+#include <sys/resource.h>
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+'
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+
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+ccflags="$@"
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+
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+# Write go tool cgo -godefs input.
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+(
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+ echo package unix
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+ echo
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+ echo '/*'
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+ indirect="includes_$(uname)"
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+ echo "${!indirect} $includes"
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+ echo '*/'
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+ echo 'import "C"'
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+ echo
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+ echo 'const ('
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+
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+ # The gcc command line prints all the #defines
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+ # it encounters while processing the input
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+ echo "${!indirect} $includes" | $CC -x c - -E -dM $ccflags |
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+ awk '
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+ $1 != "#define" || $2 ~ /\(/ || $3 == "" {next}
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+
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+ $2 ~ /^E([ABCD]X|[BIS]P|[SD]I|S|FL)$/ {next} # 386 registers
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+ $2 ~ /^(SIGEV_|SIGSTKSZ|SIGRT(MIN|MAX))/ {next}
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+ $2 ~ /^(SCM_SRCRT)$/ {next}
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+ $2 ~ /^(MAP_FAILED)$/ {next}
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+
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+ $2 !~ /^ETH_/ &&
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+ $2 !~ /^EPROC_/ &&
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+ $2 !~ /^EQUIV_/ &&
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+ $2 !~ /^EXPR_/ &&
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+ $2 ~ /^E[A-Z0-9_]+$/ ||
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+ $2 ~ /^B[0-9_]+$/ ||
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+ $2 ~ /^V[A-Z0-9]+$/ ||
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+ $2 ~ /^CS[A-Z0-9]/ ||
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+ $2 ~ /^I(SIG|CANON|CRNL|EXTEN|MAXBEL|STRIP|UTF8)$/ ||
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+ $2 ~ /^IGN/ ||
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+ $2 ~ /^IX(ON|ANY|OFF)$/ ||
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+ $2 ~ /^IN(LCR|PCK)$/ ||
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+ $2 ~ /(^FLU?SH)|(FLU?SH$)/ ||
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+ $2 ~ /^C(LOCAL|READ)$/ ||
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+ $2 == "BRKINT" ||
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+ $2 == "HUPCL" ||
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+ $2 == "PENDIN" ||
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+ $2 == "TOSTOP" ||
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+ $2 ~ /^PAR/ ||
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+ $2 ~ /^SIG[^_]/ ||
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+ $2 ~ /^O[CNPFP][A-Z]+[^_][A-Z]+$/ ||
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+ $2 ~ /^IN_/ ||
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+ $2 ~ /^LOCK_(SH|EX|NB|UN)$/ ||
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+ $2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|ICMP6|TCP|EVFILT|NOTE|EV|SHUT|PROT|MAP|PACKET|MSG|SCM|MCL|DT|MADV|PR)_/ ||
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+ $2 == "ICMPV6_FILTER" ||
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+ $2 == "SOMAXCONN" ||
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+ $2 == "NAME_MAX" ||
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+ $2 == "IFNAMSIZ" ||
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+ $2 ~ /^CTL_(MAXNAME|NET|QUERY)$/ ||
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+ $2 ~ /^SYSCTL_VERS/ ||
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+ $2 ~ /^(MS|MNT)_/ ||
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+ $2 ~ /^TUN(SET|GET|ATTACH|DETACH)/ ||
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+ $2 ~ /^(O|F|FD|NAME|S|PTRACE|PT)_/ ||
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+ $2 ~ /^LINUX_REBOOT_CMD_/ ||
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+ $2 ~ /^LINUX_REBOOT_MAGIC[12]$/ ||
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+ $2 !~ "NLA_TYPE_MASK" &&
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+ $2 ~ /^(NETLINK|NLM|NLMSG|NLA|IFA|IFAN|RT|RTCF|RTN|RTPROT|RTNH|ARPHRD|ETH_P)_/ ||
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+ $2 ~ /^SIOC/ ||
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+ $2 ~ /^TIOC/ ||
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+ $2 !~ "RTF_BITS" &&
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+ $2 ~ /^(IFF|IFT|NET_RT|RTM|RTF|RTV|RTA|RTAX)_/ ||
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+ $2 ~ /^BIOC/ ||
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+ $2 ~ /^RUSAGE_(SELF|CHILDREN|THREAD)/ ||
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+ $2 ~ /^RLIMIT_(AS|CORE|CPU|DATA|FSIZE|NOFILE|STACK)|RLIM_INFINITY/ ||
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+ $2 ~ /^PRIO_(PROCESS|PGRP|USER)/ ||
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+ $2 ~ /^CLONE_[A-Z_]+/ ||
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+ $2 !~ /^(BPF_TIMEVAL)$/ &&
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+ $2 ~ /^(BPF|DLT)_/ ||
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+ $2 !~ "WMESGLEN" &&
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+ $2 ~ /^W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", $2, $2)}
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+ $2 ~ /^__WCOREFLAG$/ {next}
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+ $2 ~ /^__W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", substr($2,3), $2)}
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+
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+ {next}
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+ ' | sort
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+
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+ echo ')'
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+) >_const.go
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+
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+# Pull out the error names for later.
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+errors=$(
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+ echo '#include <errno.h>' | $CC -x c - -E -dM $ccflags |
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+ awk '$1=="#define" && $2 ~ /^E[A-Z0-9_]+$/ { print $2 }' |
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+ sort
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+)
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+
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+# Pull out the signal names for later.
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+signals=$(
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+ echo '#include <signal.h>' | $CC -x c - -E -dM $ccflags |
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+ awk '$1=="#define" && $2 ~ /^SIG[A-Z0-9]+$/ { print $2 }' |
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+ egrep -v '(SIGSTKSIZE|SIGSTKSZ|SIGRT)' |
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+ sort
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+)
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+
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+# Again, writing regexps to a file.
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+echo '#include <errno.h>' | $CC -x c - -E -dM $ccflags |
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+ awk '$1=="#define" && $2 ~ /^E[A-Z0-9_]+$/ { print "^\t" $2 "[ \t]*=" }' |
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+ sort >_error.grep
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+echo '#include <signal.h>' | $CC -x c - -E -dM $ccflags |
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+ awk '$1=="#define" && $2 ~ /^SIG[A-Z0-9]+$/ { print "^\t" $2 "[ \t]*=" }' |
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+ egrep -v '(SIGSTKSIZE|SIGSTKSZ|SIGRT)' |
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+ sort >_signal.grep
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+
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+echo '// mkerrors.sh' "$@"
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+echo '// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT'
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+echo
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+go tool cgo -godefs -- "$@" _const.go >_error.out
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+cat _error.out | grep -vf _error.grep | grep -vf _signal.grep
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+echo
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+echo '// Errors'
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+echo 'const ('
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+cat _error.out | grep -f _error.grep | sed 's/=\(.*\)/= Errno(\1)/'
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+echo ')'
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+
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+echo
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+echo '// Signals'
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+echo 'const ('
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+cat _error.out | grep -f _signal.grep | sed 's/=\(.*\)/= Signal(\1)/'
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+echo ')'
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+
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+# Run C program to print error and syscall strings.
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+(
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+ echo -E "
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <errno.h>
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+#include <ctype.h>
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+#include <string.h>
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+#include <signal.h>
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+
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+#define nelem(x) (sizeof(x)/sizeof((x)[0]))
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+
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+enum { A = 'A', Z = 'Z', a = 'a', z = 'z' }; // avoid need for single quotes below
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+
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+int errors[] = {
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+"
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+ for i in $errors
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+ do
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+ echo -E ' '$i,
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+ done
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+
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+ echo -E "
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+};
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+
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+int signals[] = {
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+"
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+ for i in $signals
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+ do
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+ echo -E ' '$i,
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+ done
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+
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+ # Use -E because on some systems bash builtin interprets \n itself.
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+ echo -E '
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+};
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+
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+static int
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+intcmp(const void *a, const void *b)
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+{
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+ return *(int*)a - *(int*)b;
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+}
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+
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+int
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+main(void)
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+{
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+ int i, j, e;
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+ char buf[1024], *p;
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+
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+ printf("\n\n// Error table\n");
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+ printf("var errors = [...]string {\n");
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+ qsort(errors, nelem(errors), sizeof errors[0], intcmp);
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+ for(i=0; i<nelem(errors); i++) {
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+ e = errors[i];
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+ if(i > 0 && errors[i-1] == e)
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+ continue;
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+ strcpy(buf, strerror(e));
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+ // lowercase first letter: Bad -> bad, but STREAM -> STREAM.
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+ if(A <= buf[0] && buf[0] <= Z && a <= buf[1] && buf[1] <= z)
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+ buf[0] += a - A;
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+ printf("\t%d: \"%s\",\n", e, buf);
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+ }
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+ printf("}\n\n");
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+
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+ printf("\n\n// Signal table\n");
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+ printf("var signals = [...]string {\n");
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+ qsort(signals, nelem(signals), sizeof signals[0], intcmp);
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+ for(i=0; i<nelem(signals); i++) {
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+ e = signals[i];
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+ if(i > 0 && signals[i-1] == e)
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+ continue;
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+ strcpy(buf, strsignal(e));
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+ // lowercase first letter: Bad -> bad, but STREAM -> STREAM.
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+ if(A <= buf[0] && buf[0] <= Z && a <= buf[1] && buf[1] <= z)
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+ buf[0] += a - A;
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+ // cut trailing : number.
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+ p = strrchr(buf, ":"[0]);
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+ if(p)
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+ *p = '\0';
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+ printf("\t%d: \"%s\",\n", e, buf);
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+ }
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+ printf("}\n\n");
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+
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+ return 0;
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+}
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+
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+'
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+) >_errors.c
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+
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+$CC $ccflags -o _errors _errors.c && $GORUN ./_errors && rm -f _errors.c _errors _const.go _error.grep _signal.grep _error.out
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Rob Pike