text: #!/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
  
  if test -z "$GOARCH" -o -z "$GOOS"; then
  	echo 1>&2 "GOARCH or GOOS not defined in environment"
  	exit 1
  fi
  
  # Check that we are using the new build system if we should
  if [[ "$GOOS" = "linux" ]] && [[ "$GOARCH" != "sparc64" ]]; then
  	if [[ "$GOLANG_SYS_BUILD" != "docker" ]]; then
  		echo 1>&2 "In the new build system, mkerrors should not be called directly."
  		echo 1>&2 "See README.md"
  		exit 1
  	fi
  fi
  
  if [[ "$GOOS" = "aix" ]]; then
  	CC=${CC:-gcc}
  else
  	CC=${CC:-cc}
  fi
  
  if [[ "$GOOS" = "solaris" ]]; then
  	# Assumes GNU versions of utilities in PATH.
  	export PATH=/usr/gnu/bin:$PATH
  fi
  
  uname=$(uname)
  
  includes_AIX='
  #include <net/if.h>
  #include <net/netopt.h>
  #include <netinet/ip_mroute.h>
  #include <sys/protosw.h>
  #include <sys/stropts.h>
  #include <sys/mman.h>
  #include <sys/poll.h>
  #include <sys/termio.h>
  #include <termios.h>
  #include <fcntl.h>
  
  #define AF_LOCAL AF_UNIX
  '
  
  includes_Darwin='
  #define _DARWIN_C_SOURCE
  #define KERNEL
  #define _DARWIN_USE_64_BIT_INODE
  #include <stdint.h>
  #include <sys/attr.h>
  #include <sys/types.h>
  #include <sys/event.h>
  #include <sys/ptrace.h>
  #include <sys/socket.h>
  #include <sys/sockio.h>
  #include <sys/sysctl.h>
  #include <sys/mman.h>
  #include <sys/mount.h>
  #include <sys/utsname.h>
  #include <sys/wait.h>
  #include <sys/xattr.h>
  #include <net/bpf.h>
  #include <net/if.h>
  #include <net/if_types.h>
  #include <net/route.h>
  #include <netinet/in.h>
  #include <netinet/ip.h>
  #include <termios.h>
  '
  
  includes_DragonFly='
  #include <sys/types.h>
  #include <sys/event.h>
  #include <sys/socket.h>
  #include <sys/sockio.h>
  #include <sys/stat.h>
  #include <sys/sysctl.h>
  #include <sys/mman.h>
  #include <sys/mount.h>
  #include <sys/wait.h>
  #include <sys/ioctl.h>
  #include <net/bpf.h>
  #include <net/if.h>
  #include <net/if_types.h>
  #include <net/route.h>
  #include <netinet/in.h>
  #include <termios.h>
  #include <netinet/ip.h>
  #include <net/ip_mroute/ip_mroute.h>
  '
  
  includes_FreeBSD='
  #include <sys/capability.h>
  #include <sys/param.h>
  #include <sys/types.h>
  #include <sys/event.h>
  #include <sys/socket.h>
  #include <sys/sockio.h>
  #include <sys/stat.h>
  #include <sys/sysctl.h>
  #include <sys/mman.h>
  #include <sys/mount.h>
  #include <sys/wait.h>
  #include <sys/ioctl.h>
  #include <net/bpf.h>
  #include <net/if.h>
  #include <net/if_types.h>
  #include <net/route.h>
  #include <netinet/in.h>
  #include <termios.h>
  #include <netinet/ip.h>
  #include <netinet/ip_mroute.h>
  #include <sys/extattr.h>
  
  #if __FreeBSD__ >= 10
  #define IFT_CARP	0xf8	// IFT_CARP is deprecated in FreeBSD 10
  #undef SIOCAIFADDR
  #define SIOCAIFADDR	_IOW(105, 26, struct oifaliasreq)	// ifaliasreq contains if_data
  #undef SIOCSIFPHYADDR
  #define SIOCSIFPHYADDR	_IOW(105, 70, struct oifaliasreq)	// ifaliasreq contains if_data
  #endif
  '
  
  includes_Linux='
  #define _LARGEFILE_SOURCE
  #define _LARGEFILE64_SOURCE
  #ifndef __LP64__
  #define _FILE_OFFSET_BITS 64
  #endif
  #define _GNU_SOURCE
  
  // <sys/ioctl.h> is broken on powerpc64, as it fails to include definitions of
  // these structures. We just include them copied from <bits/termios.h>.
  #if defined(__powerpc__)
  struct sgttyb {
          char    sg_ispeed;
          char    sg_ospeed;
          char    sg_erase;
          char    sg_kill;
          short   sg_flags;
  };
  
  struct tchars {
          char    t_intrc;
          char    t_quitc;
          char    t_startc;
          char    t_stopc;
          char    t_eofc;
          char    t_brkc;
  };
  
  struct ltchars {
          char    t_suspc;
          char    t_dsuspc;
          char    t_rprntc;
          char    t_flushc;
          char    t_werasc;
          char    t_lnextc;
  };
  #endif
  
  #include <bits/sockaddr.h>
  #include <sys/epoll.h>
  #include <sys/eventfd.h>
  #include <sys/inotify.h>
  #include <sys/ioctl.h>
  #include <sys/mman.h>
  #include <sys/mount.h>
  #include <sys/prctl.h>
  #include <sys/stat.h>
  #include <sys/types.h>
  #include <sys/time.h>
  #include <sys/socket.h>
  #include <sys/xattr.h>
  #include <linux/if.h>
  #include <linux/if_alg.h>
  #include <linux/if_arp.h>
  #include <linux/if_ether.h>
  #include <linux/if_tun.h>
  #include <linux/if_packet.h>
  #include <linux/if_addr.h>
  #include <linux/falloc.h>
  #include <linux/filter.h>
  #include <linux/fs.h>
  #include <linux/kexec.h>
  #include <linux/keyctl.h>
  #include <linux/magic.h>
  #include <linux/memfd.h>
  #include <linux/module.h>
  #include <linux/netfilter/nfnetlink.h>
  #include <linux/netlink.h>
  #include <linux/net_namespace.h>
  #include <linux/perf_event.h>
  #include <linux/random.h>
  #include <linux/reboot.h>
  #include <linux/rtnetlink.h>
  #include <linux/ptrace.h>
  #include <linux/sched.h>
  #include <linux/seccomp.h>
  #include <linux/sockios.h>
  #include <linux/wait.h>
  #include <linux/icmpv6.h>
  #include <linux/serial.h>
  #include <linux/can.h>
  #include <linux/vm_sockets.h>
  #include <linux/taskstats.h>
  #include <linux/genetlink.h>
  #include <linux/watchdog.h>
  #include <linux/hdreg.h>
  #include <linux/rtc.h>
  #include <linux/if_xdp.h>
  #include <mtd/ubi-user.h>
  #include <net/route.h>
  #include <asm/termbits.h>
  
  #ifndef MSG_FASTOPEN
  #define MSG_FASTOPEN    0x20000000
  #endif
  
  #ifndef PTRACE_GETREGS
  #define PTRACE_GETREGS	0xc
  #endif
  
  #ifndef PTRACE_SETREGS
  #define PTRACE_SETREGS	0xd
  #endif
  
  #ifndef SOL_NETLINK
  #define SOL_NETLINK	270
  #endif
  
  #ifdef SOL_BLUETOOTH
  // SPARC includes this in /usr/include/sparc64-linux-gnu/bits/socket.h
  // but it is already in bluetooth_linux.go
  #undef SOL_BLUETOOTH
  #endif
  
  // Certain constants are missing from the fs/crypto UAPI
  #define FS_KEY_DESC_PREFIX              "fscrypt:"
  #define FS_KEY_DESC_PREFIX_SIZE         8
  #define FS_MAX_KEY_SIZE                 64
  
  // XDP socket constants do not appear to be picked up otherwise.
  // Copied from samples/bpf/xdpsock_user.c.
  #ifndef SOL_XDP
  #define SOL_XDP 283
  #endif
  
  #ifndef AF_XDP
  #define AF_XDP 44
  #endif
  '
  
  includes_NetBSD='
  #include <sys/types.h>
  #include <sys/param.h>
  #include <sys/event.h>
  #include <sys/extattr.h>
  #include <sys/mman.h>
  #include <sys/mount.h>
  #include <sys/socket.h>
  #include <sys/sockio.h>
  #include <sys/sysctl.h>
  #include <sys/termios.h>
  #include <sys/ttycom.h>
  #include <sys/wait.h>
  #include <net/bpf.h>
  #include <net/if.h>
  #include <net/if_types.h>
  #include <net/route.h>
  #include <netinet/in.h>
  #include <netinet/in_systm.h>
  #include <netinet/ip.h>
  #include <netinet/ip_mroute.h>
  #include <netinet/if_ether.h>
  
  // Needed since <sys/param.h> refers to it...
  #define schedppq 1
  '
  
  includes_OpenBSD='
  #include <sys/types.h>
  #include <sys/param.h>
  #include <sys/event.h>
  #include <sys/mman.h>
  #include <sys/mount.h>
  #include <sys/socket.h>
  #include <sys/sockio.h>
  #include <sys/stat.h>
  #include <sys/sysctl.h>
  #include <sys/termios.h>
  #include <sys/ttycom.h>
  #include <sys/unistd.h>
  #include <sys/wait.h>
  #include <net/bpf.h>
  #include <net/if.h>
  #include <net/if_types.h>
  #include <net/if_var.h>
  #include <net/route.h>
  #include <netinet/in.h>
  #include <netinet/in_systm.h>
  #include <netinet/ip.h>
  #include <netinet/ip_mroute.h>
  #include <netinet/if_ether.h>
  #include <net/if_bridge.h>
  
  // We keep some constants not supported in OpenBSD 5.5 and beyond for
  // the promise of compatibility.
  #define EMUL_ENABLED		0x1
  #define EMUL_NATIVE		0x2
  #define IPV6_FAITH		0x1d
  #define IPV6_OPTIONS		0x1
  #define IPV6_RTHDR_STRICT	0x1
  #define IPV6_SOCKOPT_RESERVED1	0x3
  #define SIOCGIFGENERIC		0xc020693a
  #define SIOCSIFGENERIC		0x80206939
  #define WALTSIG			0x4
  '
  
  includes_SunOS='
  #include <limits.h>
  #include <sys/types.h>
  #include <sys/socket.h>
  #include <sys/sockio.h>
  #include <sys/stat.h>
  #include <sys/mman.h>
  #include <sys/wait.h>
  #include <sys/ioctl.h>
  #include <sys/mkdev.h>
  #include <net/bpf.h>
  #include <net/if.h>
  #include <net/if_arp.h>
  #include <net/if_types.h>
  #include <net/route.h>
  #include <netinet/in.h>
  #include <termios.h>
  #include <netinet/ip.h>
  #include <netinet/ip_mroute.h>
  '
  
  
  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>
  #include <time.h>
  '
  ccflags="$@"
  
  # Write go tool cgo -godefs input.
  (
  	echo package unix
  	echo
  	echo '/*'
  	indirect="includes_$(uname)"
  	echo "${!indirect} $includes"
  	echo '*/'
  	echo 'import "C"'
  	echo 'import "syscall"'
  	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}
  		$2 ~ /^ELF_.*$/ {next}# <asm/elf.h> contains ELF_ARCH, etc.
  
  		$2 ~ /^EXTATTR_NAMESPACE_NAMES/ ||
  		$2 ~ /^EXTATTR_NAMESPACE_[A-Z]+_STRING/ {next}
  
  		$2 !~ /^ECCAPBITS/ &&
  		$2 !~ /^ETH_/ &&
  		$2 !~ /^EPROC_/ &&
  		$2 !~ /^EQUIV_/ &&
  		$2 !~ /^EXPR_/ &&
  		$2 ~ /^E[A-Z0-9_]+$/ ||
  		$2 ~ /^B[0-9_]+$/ ||
  		$2 ~ /^(OLD|NEW)DEV$/ ||
  		$2 == "BOTHER" ||
  		$2 ~ /^CI?BAUD(EX)?$/ ||
  		$2 == "IBSHIFT" ||
  		$2 ~ /^V[A-Z0-9]+$/ ||
  		$2 ~ /^CS[A-Z0-9]/ ||
  		$2 ~ /^I(SIG|CANON|CRNL|UCLC|EXTEN|MAXBEL|STRIP|UTF8)$/ ||
  		$2 ~ /^IGN/ ||
  		$2 ~ /^IX(ON|ANY|OFF)$/ ||
  		$2 ~ /^IN(LCR|PCK)$/ ||
  		$2 !~ "X86_CR3_PCID_NOFLUSH" &&
  		$2 ~ /(^FLU?SH)|(FLU?SH$)/ ||
  		$2 ~ /^C(LOCAL|READ|MSPAR|RTSCTS)$/ ||
  		$2 == "BRKINT" ||
  		$2 == "HUPCL" ||
  		$2 == "PENDIN" ||
  		$2 == "TOSTOP" ||
  		$2 == "XCASE" ||
  		$2 == "ALTWERASE" ||
  		$2 == "NOKERNINFO" ||
  		$2 ~ /^PAR/ ||
  		$2 ~ /^SIG[^_]/ ||
  		$2 ~ /^O[CNPFPL][A-Z]+[^_][A-Z]+$/ ||
  		$2 ~ /^(NL|CR|TAB|BS|VT|FF)DLY$/ ||
  		$2 ~ /^(NL|CR|TAB|BS|VT|FF)[0-9]$/ ||
  		$2 ~ /^O?XTABS$/ ||
  		$2 ~ /^TC[IO](ON|OFF)$/ ||
  		$2 ~ /^IN_/ ||
  		$2 ~ /^LOCK_(SH|EX|NB|UN)$/ ||
  		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|ICMP6|TCP|EVFILT|NOTE|EV|SHUT|PROT|MAP|MFD|T?PACKET|MSG|SCM|MCL|DT|MADV|PR)_/ ||
  		$2 ~ /^TP_STATUS_/ ||
  		$2 ~ /^FALLOC_/ ||
  		$2 == "ICMPV6_FILTER" ||
  		$2 == "SOMAXCONN" ||
  		$2 == "NAME_MAX" ||
  		$2 == "IFNAMSIZ" ||
  		$2 ~ /^CTL_(HW|KERN|MAXNAME|NET|QUERY)$/ ||
  		$2 ~ /^KERN_(HOSTNAME|OS(RELEASE|TYPE)|VERSION)$/ ||
  		$2 ~ /^HW_MACHINE$/ ||
  		$2 ~ /^SYSCTL_VERS/ ||
  		$2 !~ "MNT_BITS" &&
  		$2 ~ /^(MS|MNT|UMOUNT)_/ ||
  		$2 ~ /^TUN(SET|GET|ATTACH|DETACH)/ ||
  		$2 ~ /^(O|F|E?FD|NAME|S|PTRACE|PT)_/ ||
  		$2 ~ /^KEXEC_/ ||
  		$2 ~ /^LINUX_REBOOT_CMD_/ ||
  		$2 ~ /^LINUX_REBOOT_MAGIC[12]$/ ||
  		$2 ~ /^MODULE_INIT_/ ||
  		$2 !~ "NLA_TYPE_MASK" &&
  		$2 ~ /^(NETLINK|NLM|NLMSG|NLA|IFA|IFAN|RT|RTC|RTCF|RTN|RTPROT|RTNH|ARPHRD|ETH_P|NETNSA)_/ ||
  		$2 ~ /^SIOC/ ||
  		$2 ~ /^TIOC/ ||
  		$2 ~ /^TCGET/ ||
  		$2 ~ /^TCSET/ ||
  		$2 ~ /^TC(FLSH|SBRKP?|XONC)$/ ||
  		$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|LOCKS|MEMLOCK|MSGQUEUE|NICE|NOFILE|NPROC|RSS|RTPRIO|RTTIME|SIGPENDING|STACK)|RLIM_INFINITY/ ||
  		$2 ~ /^PRIO_(PROCESS|PGRP|USER)/ ||
  		$2 ~ /^CLONE_[A-Z_]+/ ||
  		$2 !~ /^(BPF_TIMEVAL)$/ &&
  		$2 ~ /^(BPF|DLT)_/ ||
  		$2 ~ /^CLOCK_/ ||
  		$2 ~ /^CAN_/ ||
  		$2 ~ /^CAP_/ ||
  		$2 ~ /^ALG_/ ||
  		$2 ~ /^FS_(POLICY_FLAGS|KEY_DESC|ENCRYPTION_MODE|[A-Z0-9_]+_KEY_SIZE|IOC_(GET|SET)_ENCRYPTION)/ ||
  		$2 ~ /^GRND_/ ||
  		$2 ~ /^KEY_(SPEC|REQKEY_DEFL)_/ ||
  		$2 ~ /^KEYCTL_/ ||
  		$2 ~ /^PERF_EVENT_IOC_/ ||
  		$2 ~ /^SECCOMP_MODE_/ ||
  		$2 ~ /^SPLICE_/ ||
  		$2 ~ /^SYNC_FILE_RANGE_/ ||
  		$2 !~ /^AUDIT_RECORD_MAGIC/ &&
  		$2 !~ /IOC_MAGIC/ &&
  		$2 ~ /^[A-Z][A-Z0-9_]+_MAGIC2?$/ ||
  		$2 ~ /^(VM|VMADDR)_/ ||
  		$2 ~ /^IOCTL_VM_SOCKETS_/ ||
  		$2 ~ /^(TASKSTATS|TS)_/ ||
  		$2 ~ /^CGROUPSTATS_/ ||
  		$2 ~ /^GENL_/ ||
  		$2 ~ /^STATX_/ ||
  		$2 ~ /^RENAME/ ||
  		$2 ~ /^UBI_IOC[A-Z]/ ||
  		$2 ~ /^UTIME_/ ||
  		$2 ~ /^XATTR_(CREATE|REPLACE|NO(DEFAULT|FOLLOW|SECURITY)|SHOWCOMPRESSION)/ ||
  		$2 ~ /^ATTR_(BIT_MAP_COUNT|(CMN|VOL|FILE)_)/ ||
  		$2 ~ /^FSOPT_/ ||
  		$2 ~ /^WDIOC_/ ||
  		$2 ~ /^NFN/ ||
  		$2 ~ /^XDP_/ ||
  		$2 ~ /^(HDIO|WIN|SMART)_/ ||
  		$2 !~ "WMESGLEN" &&
  		$2 ~ /^W[A-Z0-9]+$/ ||
  		$2 ~ /^BLK[A-Z]*(GET$|SET$|BUF$|PART$|SIZE)/ {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|SIGMAX64)' |
  	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|SIGMAX64)' |
  	sort >_signal.grep
  
  echo '// mkerrors.sh' "$@"
  echo '// Code generated by the command above; see README.md. DO NOT EDIT.'
  echo
  echo "// +build ${GOARCH},${GOOS}"
  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/=\(.*\)/= syscall.Errno(\1)/'
  echo ')'
  
  echo
  echo '// Signals'
  echo 'const ('
  cat _error.out | grep -f _signal.grep | sed 's/=\(.*\)/= syscall.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
  
  struct tuple {
  	int num;
  	const char *name;
  };
  
  struct tuple errors[] = {
  "
  	for i in $errors
  	do
  		echo -E '	{'$i', "'$i'" },'
  	done
  
  	echo -E "
  };
  
  struct tuple signals[] = {
  "
  	for i in $signals
  	do
  		echo -E '	{'$i', "'$i'" },'
  	done
  
  	# Use -E because on some systems bash builtin interprets \n itself.
  	echo -E '
  };
  
  static int
  tuplecmp(const void *a, const void *b)
  {
  	return ((struct tuple *)a)->num - ((struct tuple *)b)->num;
  }
  
  int
  main(void)
  {
  	int i, e;
  	char buf[1024], *p;
  
  	printf("\n\n// Error table\n");
  	printf("var errorList = [...]struct {\n");
  	printf("\tnum  syscall.Errno\n");
  	printf("\tname string\n");
  	printf("\tdesc string\n");
  	printf("} {\n");
  	qsort(errors, nelem(errors), sizeof errors[0], tuplecmp);
  	for(i=0; i<nelem(errors); i++) {
  		e = errors[i].num;
  		if(i > 0 && errors[i-1].num == 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\", \"%s\" },\n", e, errors[i].name, buf);
  	}
  	printf("}\n\n");
  
  	printf("\n\n// Signal table\n");
  	printf("var signalList = [...]struct {\n");
  	printf("\tnum  syscall.Signal\n");
  	printf("\tname string\n");
  	printf("\tdesc string\n");
  	printf("} {\n");
  	qsort(signals, nelem(signals), sizeof signals[0], tuplecmp);
  	for(i=0; i<nelem(signals); i++) {
  		e = signals[i].num;
  		if(i > 0 && signals[i-1].num == 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\", \"%s\" },\n", e, signals[i].name, 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
  