1#!/usr/bin/env bash
2# Copyright 2009 The Go Authors. All rights reserved.
3# Use of this source code is governed by a BSD-style
4# license that can be found in the LICENSE file.
5
6# Generate Go code listing errors and other #defined constant
7# values (ENAMETOOLONG etc.), by asking the preprocessor
8# about the definitions.
9
10unset LANG
11export LC_ALL=C
12export LC_CTYPE=C
13
14CC=${CC:-gcc}
15
16uname=$(uname)
17
18includes='
19#include <sys/types.h>
20#include <sys/file.h>
21#include <fcntl.h>
22#include <dirent.h>
23#include <sys/socket.h>
24#include <netinet/in.h>
25#include <netinet/ip.h>
26#include <netinet/ip6.h>
27#include <netinet/tcp.h>
28#include <errno.h>
29#include <sys/signal.h>
30#include <signal.h>
31#include <sys/resource.h>
32'
33
34ccflags="$@"
35
36# Write go tool cgo -godefs input.
37(
38 echo package plan9
39 echo
40 echo '/*'
41 indirect="includes_$(uname)"
42 echo "${!indirect} $includes"
43 echo '*/'
44 echo 'import "C"'
45 echo
46 echo 'const ('
47
48 # The gcc command line prints all the #defines
49 # it encounters while processing the input
50 echo "${!indirect} $includes" | $CC -x c - -E -dM $ccflags |
51 awk '
52 $1 != "#define" || $2 ~ /\(/ || $3 == "" {next}
53
54 $2 ~ /^E([ABCD]X|[BIS]P|[SD]I|S|FL)$/ {next} # 386 registers
55 $2 ~ /^(SIGEV_|SIGSTKSZ|SIGRT(MIN|MAX))/ {next}
56 $2 ~ /^(SCM_SRCRT)$/ {next}
57 $2 ~ /^(MAP_FAILED)$/ {next}
58
59 $2 !~ /^ETH_/ &&
60 $2 !~ /^EPROC_/ &&
61 $2 !~ /^EQUIV_/ &&
62 $2 !~ /^EXPR_/ &&
63 $2 ~ /^E[A-Z0-9_]+$/ ||
64 $2 ~ /^B[0-9_]+$/ ||
65 $2 ~ /^V[A-Z0-9]+$/ ||
66 $2 ~ /^CS[A-Z0-9]/ ||
67 $2 ~ /^I(SIG|CANON|CRNL|EXTEN|MAXBEL|STRIP|UTF8)$/ ||
68 $2 ~ /^IGN/ ||
69 $2 ~ /^IX(ON|ANY|OFF)$/ ||
70 $2 ~ /^IN(LCR|PCK)$/ ||
71 $2 ~ /(^FLU?SH)|(FLU?SH$)/ ||
72 $2 ~ /^C(LOCAL|READ)$/ ||
73 $2 == "BRKINT" ||
74 $2 == "HUPCL" ||
75 $2 == "PENDIN" ||
76 $2 == "TOSTOP" ||
77 $2 ~ /^PAR/ ||
78 $2 ~ /^SIG[^_]/ ||
79 $2 ~ /^O[CNPFP][A-Z]+[^_][A-Z]+$/ ||
80 $2 ~ /^IN_/ ||
81 $2 ~ /^LOCK_(SH|EX|NB|UN)$/ ||
82 $2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|ICMP6|TCP|EVFILT|NOTE|EV|SHUT|PROT|MAP|PACKET|MSG|SCM|MCL|DT|MADV|PR)_/ ||
83 $2 == "ICMPV6_FILTER" ||
84 $2 == "SOMAXCONN" ||
85 $2 == "NAME_MAX" ||
86 $2 == "IFNAMSIZ" ||
87 $2 ~ /^CTL_(MAXNAME|NET|QUERY)$/ ||
88 $2 ~ /^SYSCTL_VERS/ ||
89 $2 ~ /^(MS|MNT)_/ ||
90 $2 ~ /^TUN(SET|GET|ATTACH|DETACH)/ ||
91 $2 ~ /^(O|F|FD|NAME|S|PTRACE|PT)_/ ||
92 $2 ~ /^LINUX_REBOOT_CMD_/ ||
93 $2 ~ /^LINUX_REBOOT_MAGIC[12]$/ ||
94 $2 !~ "NLA_TYPE_MASK" &&
95 $2 ~ /^(NETLINK|NLM|NLMSG|NLA|IFA|IFAN|RT|RTCF|RTN|RTPROT|RTNH|ARPHRD|ETH_P)_/ ||
96 $2 ~ /^SIOC/ ||
97 $2 ~ /^TIOC/ ||
98 $2 !~ "RTF_BITS" &&
99 $2 ~ /^(IFF|IFT|NET_RT|RTM|RTF|RTV|RTA|RTAX)_/ ||
100 $2 ~ /^BIOC/ ||
101 $2 ~ /^RUSAGE_(SELF|CHILDREN|THREAD)/ ||
102 $2 ~ /^RLIMIT_(AS|CORE|CPU|DATA|FSIZE|NOFILE|STACK)|RLIM_INFINITY/ ||
103 $2 ~ /^PRIO_(PROCESS|PGRP|USER)/ ||
104 $2 ~ /^CLONE_[A-Z_]+/ ||
105 $2 !~ /^(BPF_TIMEVAL)$/ &&
106 $2 ~ /^(BPF|DLT)_/ ||
107 $2 !~ "WMESGLEN" &&
108 $2 ~ /^W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", $2, $2)}
109 $2 ~ /^__WCOREFLAG$/ {next}
110 $2 ~ /^__W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", substr($2,3), $2)}
111
112 {next}
113 ' | sort
114
115 echo ')'
116) >_const.go
117
118# Pull out the error names for later.
119errors=$(
120 echo '#include <errno.h>' | $CC -x c - -E -dM $ccflags |
121 awk '$1=="#define" && $2 ~ /^E[A-Z0-9_]+$/ { print $2 }' |
122 sort
123)
124
125# Pull out the signal names for later.
126signals=$(
127 echo '#include <signal.h>' | $CC -x c - -E -dM $ccflags |
128 awk '$1=="#define" && $2 ~ /^SIG[A-Z0-9]+$/ { print $2 }' |
129 grep -v 'SIGSTKSIZE\|SIGSTKSZ\|SIGRT' |
130 sort
131)
132
133# Again, writing regexps to a file.
134echo '#include <errno.h>' | $CC -x c - -E -dM $ccflags |
135 awk '$1=="#define" && $2 ~ /^E[A-Z0-9_]+$/ { print "^\t" $2 "[ \t]*=" }' |
136 sort >_error.grep
137echo '#include <signal.h>' | $CC -x c - -E -dM $ccflags |
138 awk '$1=="#define" && $2 ~ /^SIG[A-Z0-9]+$/ { print "^\t" $2 "[ \t]*=" }' |
139 grep -v 'SIGSTKSIZE\|SIGSTKSZ\|SIGRT' |
140 sort >_signal.grep
141
142echo '// mkerrors.sh' "$@"
143echo '// Code generated by the command above; DO NOT EDIT.'
144echo
145go tool cgo -godefs -- "$@" _const.go >_error.out
146cat _error.out | grep -vf _error.grep | grep -vf _signal.grep
147echo
148echo '// Errors'
149echo 'const ('
150cat _error.out | grep -f _error.grep | sed 's/=\(.*\)/= Errno(\1)/'
151echo ')'
152
153echo
154echo '// Signals'
155echo 'const ('
156cat _error.out | grep -f _signal.grep | sed 's/=\(.*\)/= Signal(\1)/'
157echo ')'
158
159# Run C program to print error and syscall strings.
160(
161 echo -E "
162#include <stdio.h>
163#include <stdlib.h>
164#include <errno.h>
165#include <ctype.h>
166#include <string.h>
167#include <signal.h>
168
169#define nelem(x) (sizeof(x)/sizeof((x)[0]))
170
171enum { A = 'A', Z = 'Z', a = 'a', z = 'z' }; // avoid need for single quotes below
172
173int errors[] = {
174"
175 for i in $errors
176 do
177 echo -E ' '$i,
178 done
179
180 echo -E "
181};
182
183int signals[] = {
184"
185 for i in $signals
186 do
187 echo -E ' '$i,
188 done
189
190 # Use -E because on some systems bash builtin interprets \n itself.
191 echo -E '
192};
193
194static int
195intcmp(const void *a, const void *b)
196{
197 return *(int*)a - *(int*)b;
198}
199
200int
201main(void)
202{
203 int i, j, e;
204 char buf[1024], *p;
205
206 printf("\n\n// Error table\n");
207 printf("var errors = [...]string {\n");
208 qsort(errors, nelem(errors), sizeof errors[0], intcmp);
209 for(i=0; i<nelem(errors); i++) {
210 e = errors[i];
211 if(i > 0 && errors[i-1] == e)
212 continue;
213 strcpy(buf, strerror(e));
214 // lowercase first letter: Bad -> bad, but STREAM -> STREAM.
215 if(A <= buf[0] && buf[0] <= Z && a <= buf[1] && buf[1] <= z)
216 buf[0] += a - A;
217 printf("\t%d: \"%s\",\n", e, buf);
218 }
219 printf("}\n\n");
220
221 printf("\n\n// Signal table\n");
222 printf("var signals = [...]string {\n");
223 qsort(signals, nelem(signals), sizeof signals[0], intcmp);
224 for(i=0; i<nelem(signals); i++) {
225 e = signals[i];
226 if(i > 0 && signals[i-1] == e)
227 continue;
228 strcpy(buf, strsignal(e));
229 // lowercase first letter: Bad -> bad, but STREAM -> STREAM.
230 if(A <= buf[0] && buf[0] <= Z && a <= buf[1] && buf[1] <= z)
231 buf[0] += a - A;
232 // cut trailing : number.
233 p = strrchr(buf, ":"[0]);
234 if(p)
235 *p = '\0';
236 printf("\t%d: \"%s\",\n", e, buf);
237 }
238 printf("}\n\n");
239
240 return 0;
241}
242
243'
244) >_errors.c
245
246$CC $ccflags -o _errors _errors.c && $GORUN ./_errors && rm -f _errors.c _errors _const.go _error.grep _signal.grep _error.out