#!/usr/bin/env bash # Copyright 2009 The Go Authors. All rights reserved. # Use of this source code is governed by a BSD-style # license that can be found in the LICENSE file. # Generate Go code listing errors and other #defined constant # values (ENAMETOOLONG etc.), by asking the preprocessor # about the definitions. unset LANG export LC_ALL=C export LC_CTYPE=C CC=${CC:-gcc} uname=$(uname) includes=' #include <sys/types.h> #include <sys/file.h> #include <fcntl.h> #include <dirent.h> #include <sys/socket.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/ip6.h> #include <netinet/tcp.h> #include <errno.h> #include <sys/signal.h> #include <signal.h> #include <sys/resource.h> ' ccflags="$@" # Write go tool cgo -godefs input. ( echo package plan9 echo echo '/*' indirect="includes_$(uname)" echo "${!indirect} $includes" echo '*/' echo 'import "C"' echo echo 'const (' # The gcc command line prints all the #defines # it encounters while processing the input echo "${!indirect} $includes" | $CC -x c - -E -dM $ccflags | awk ' $1 != "#define" || $2 ~ /\(/ || $3 == "" {next} $2 ~ /^E([ABCD]X|[BIS]P|[SD]I|S|FL)$/ {next} # 386 registers $2 ~ /^(SIGEV_|SIGSTKSZ|SIGRT(MIN|MAX))/ {next} $2 ~ /^(SCM_SRCRT)$/ {next} $2 ~ /^(MAP_FAILED)$/ {next} $2 !~ /^ETH_/ && $2 !~ /^EPROC_/ && $2 !~ /^EQUIV_/ && $2 !~ /^EXPR_/ && $2 ~ /^E[A-Z0-9_]+$/ || $2 ~ /^B[0-9_]+$/ || $2 ~ /^V[A-Z0-9]+$/ || $2 ~ /^CS[A-Z0-9]/ || $2 ~ /^I(SIG|CANON|CRNL|EXTEN|MAXBEL|STRIP|UTF8)$/ || $2 ~ /^IGN/ || $2 ~ /^IX(ON|ANY|OFF)$/ || $2 ~ /^IN(LCR|PCK)$/ || $2 ~ /(^FLU?SH)|(FLU?SH$)/ || $2 ~ /^C(LOCAL|READ)$/ || $2 == "BRKINT" || $2 == "HUPCL" || $2 == "PENDIN" || $2 == "TOSTOP" || $2 ~ /^PAR/ || $2 ~ /^SIG[^_]/ || $2 ~ /^O[CNPFP][A-Z]+[^_][A-Z]+$/ || $2 ~ /^IN_/ || $2 ~ /^LOCK_(SH|EX|NB|UN)$/ || $2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|ICMP6|TCP|EVFILT|NOTE|EV|SHUT|PROT|MAP|PACKET|MSG|SCM|MCL|DT|MADV|PR)_/ || $2 == "ICMPV6_FILTER" || $2 == "SOMAXCONN" || $2 == "NAME_MAX" || $2 == "IFNAMSIZ" || $2 ~ /^CTL_(MAXNAME|NET|QUERY)$/ || $2 ~ /^SYSCTL_VERS/ || $2 ~ /^(MS|MNT)_/ || $2 ~ /^TUN(SET|GET|ATTACH|DETACH)/ || $2 ~ /^(O|F|FD|NAME|S|PTRACE|PT)_/ || $2 ~ /^LINUX_REBOOT_CMD_/ || $2 ~ /^LINUX_REBOOT_MAGIC[12]$/ || $2 !~ "NLA_TYPE_MASK" && $2 ~ /^(NETLINK|NLM|NLMSG|NLA|IFA|IFAN|RT|RTCF|RTN|RTPROT|RTNH|ARPHRD|ETH_P)_/ || $2 ~ /^SIOC/ || $2 ~ /^TIOC/ || $2 !~ "RTF_BITS" && $2 ~ /^(IFF|IFT|NET_RT|RTM|RTF|RTV|RTA|RTAX)_/ || $2 ~ /^BIOC/ || $2 ~ /^RUSAGE_(SELF|CHILDREN|THREAD)/ || $2 ~ /^RLIMIT_(AS|CORE|CPU|DATA|FSIZE|NOFILE|STACK)|RLIM_INFINITY/ || $2 ~ /^PRIO_(PROCESS|PGRP|USER)/ || $2 ~ /^CLONE_[A-Z_]+/ || $2 !~ /^(BPF_TIMEVAL)$/ && $2 ~ /^(BPF|DLT)_/ || $2 !~ "WMESGLEN" && $2 ~ /^W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", $2, $2)} $2 ~ /^__WCOREFLAG$/ {next} $2 ~ /^__W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", substr($2,3), $2)} {next} ' | sort echo ')' ) >_const.go # Pull out the error names for later. errors=$( echo '#include <errno.h>' | $CC -x c - -E -dM $ccflags | awk '$1=="#define" && $2 ~ /^E[A-Z0-9_]+$/ { print $2 }' | sort ) # Pull out the signal names for later. signals=$( echo '#include <signal.h>' | $CC -x c - -E -dM $ccflags | awk '$1=="#define" && $2 ~ /^SIG[A-Z0-9]+$/ { print $2 }' | egrep -v '(SIGSTKSIZE|SIGSTKSZ|SIGRT)' | sort ) # Again, writing regexps to a file. echo '#include <errno.h>' | $CC -x c - -E -dM $ccflags | awk '$1=="#define" && $2 ~ /^E[A-Z0-9_]+$/ { print "^\t" $2 "[ \t]*=" }' | sort >_error.grep echo '#include <signal.h>' | $CC -x c - -E -dM $ccflags | awk '$1=="#define" && $2 ~ /^SIG[A-Z0-9]+$/ { print "^\t" $2 "[ \t]*=" }' | egrep -v '(SIGSTKSIZE|SIGSTKSZ|SIGRT)' | sort >_signal.grep echo '// mkerrors.sh' "$@" echo '// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT' echo go tool cgo -godefs -- "$@" _const.go >_error.out cat _error.out | grep -vf _error.grep | grep -vf _signal.grep echo echo '// Errors' echo 'const (' cat _error.out | grep -f _error.grep | sed 's/=\(.*\)/= Errno(\1)/' echo ')' echo echo '// Signals' echo 'const (' cat _error.out | grep -f _signal.grep | sed 's/=\(.*\)/= Signal(\1)/' echo ')' # Run C program to print error and syscall strings. ( echo -E " #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <ctype.h> #include <string.h> #include <signal.h> #define nelem(x) (sizeof(x)/sizeof((x)[0])) enum { A = 'A', Z = 'Z', a = 'a', z = 'z' }; // avoid need for single quotes below int errors[] = { " for i in $errors do echo -E ' '$i, done echo -E " }; int signals[] = { " for i in $signals do echo -E ' '$i, done # Use -E because on some systems bash builtin interprets \n itself. echo -E ' }; static int intcmp(const void *a, const void *b) { return *(int*)a - *(int*)b; } int main(void) { int i, j, e; char buf[1024], *p; printf("\n\n// Error table\n"); printf("var errors = [...]string {\n"); qsort(errors, nelem(errors), sizeof errors[0], intcmp); for(i=0; i<nelem(errors); i++) { e = errors[i]; if(i > 0 && errors[i-1] == e) continue; strcpy(buf, strerror(e)); // lowercase first letter: Bad -> bad, but STREAM -> STREAM. if(A <= buf[0] && buf[0] <= Z && a <= buf[1] && buf[1] <= z) buf[0] += a - A; printf("\t%d: \"%s\",\n", e, buf); } printf("}\n\n"); printf("\n\n// Signal table\n"); printf("var signals = [...]string {\n"); qsort(signals, nelem(signals), sizeof signals[0], intcmp); for(i=0; i<nelem(signals); i++) { e = signals[i]; if(i > 0 && signals[i-1] == e) continue; strcpy(buf, strsignal(e)); // lowercase first letter: Bad -> bad, but STREAM -> STREAM. if(A <= buf[0] && buf[0] <= Z && a <= buf[1] && buf[1] <= z) buf[0] += a - A; // cut trailing : number. p = strrchr(buf, ":"[0]); if(p) *p = '\0'; printf("\t%d: \"%s\",\n", e, buf); } printf("}\n\n"); return 0; } ' ) >_errors.c $CC $ccflags -o _errors _errors.c && $GORUN ./_errors && rm -f _errors.c _errors _const.go _error.grep _signal.grep _error.out