libgo/mksigtab.sh

   1 #!/bin/sh
   2
   3 # Copyright 2016 The Go Authors. All rights reserved.
   4 # Use of this source code is governed by a BSD-style
   5 # license that can be found in the LICENSE file.
   6
   7 # Create sigtab.go from gen-sysinfo.go.
   8
   9 # This shell scripts creates the sigtab.go file, which maps signals to
  10 # their dispositions.  We generate a file so that we can build a
  11 # composite literal that only refers to signals that are defined on
  12 # this system.
  13
  14 # This script simply writes to standard output.
  15
  16 set -e
  17
  18 echo '// Generated by mksigtab.sh.  Do not edit.'
  19 echo
  20 echo 'package runtime'
  21 echo
  22 echo 'var sigtable = [...]sigTabT{'
  23
  24 SIGLIST=""
  25
  26 # Handle signals valid on all Unix systems.
  27
  28 addsig() {
  29     # Get the signal number and add it to SIGLIST
  30     signum=`grep "const $1 = " gen-sysinfo.go | sed -e 's/.* = //'`
  31     if echo "$signum" | grep '^_SIG[A-Z0-9_]*$' >/dev/null 2>&1; then
  32         # Recurse once to obtain signal number
  33         # This is needed for some MIPS signals defined as aliases of other signals
  34         signum=`grep "const $signum = " gen-sysinfo.go | sed -e 's/.* = //'`
  35     fi
  36     # Only add signal if the signal number isn't in the list yet.
  37     # For example, musl libc uses signal 29 for both SIGIO and SIGPOLL.
  38     if ! echo "$SIGLIST" | grep "_${signum}_" >/dev/null 2>&1; then
  39         echo "  $1: $2,"
  40         SIGLIST=$SIGLIST"_${signum}_"
  41     fi
  42 }
  43
  44 echo '  0:          {0, "SIGNONE: no trap"},'
  45 addsig _SIGHUP     '{_SigNotify + _SigKill, "SIGHUP: terminal line hangup"}'
  46 addsig _SIGINT     '{_SigNotify + _SigKill, "SIGINT: interrupt"}'
  47 addsig _SIGQUIT    '{_SigNotify + _SigThrow, "SIGQUIT: quit"}'
  48 addsig _SIGILL     '{_SigThrow + _SigUnblock, "SIGILL: illegal instruction"}'
  49 addsig _SIGTRAP    '{_SigThrow + _SigUnblock, "SIGTRAP: trace trap"}'
  50 addsig _SIGABRT    '{_SigNotify + _SigThrow, "SIGABRT: abort"}'
  51 addsig _SIGBUS     '{_SigPanic + _SigUnblock, "SIGBUS: bus error"}'
  52 addsig _SIGFPE     '{_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"}'
  53 addsig _SIGKILL    '{0, "SIGKILL: kill"}'
  54 addsig _SIGUSR1    '{_SigNotify, "SIGUSR1: user-defined signal 1"}'
  55 addsig _SIGSEGV    '{_SigPanic + _SigUnblock, "SIGSEGV: segmentation violation"}'
  56 addsig _SIGUSR2    '{_SigNotify, "SIGUSR2: user-defined signal 2"}'
  57 addsig _SIGPIPE    '{_SigNotify, "SIGPIPE: write to broken pipe"}'
  58 addsig _SIGALRM    '{_SigNotify, "SIGALRM: alarm clock"}'
  59 addsig _SIGTERM    '{_SigNotify + _SigKill, "SIGTERM: termination"}'
  60 addsig _SIGCHLD    '{_SigNotify + _SigUnblock, "SIGCHLD: child status has changed"}'
  61 addsig _SIGCONT    '{_SigNotify + _SigDefault, "SIGCONT: continue"}'
  62 addsig _SIGSTOP    '{0, "SIGSTOP: stop"}'
  63 addsig _SIGTSTP    '{_SigNotify + _SigDefault, "SIGTSTP: keyboard stop"}'
  64 addsig _SIGTTIN    '{_SigNotify + _SigDefault, "SIGTTIN: background read from tty"}'
  65 addsig _SIGTTOU    '{_SigNotify + _SigDefault, "SIGTTOU: background write to tty"}'
  66 addsig _SIGURG     '{_SigNotify, "SIGURG: urgent condition on socket"}'
  67 addsig _SIGXCPU    '{_SigNotify, "SIGXCPU: cpu limit exceeded"}'
  68 addsig _SIGXFSZ    '{_SigNotify, "SIGXFSZ: file size limit exceeded"}'
  69 addsig _SIGVTALRM  '{_SigNotify, "SIGVTALRM: virtual alarm clock"}'
  70 addsig _SIGPROF    '{_SigNotify + _SigUnblock, "SIGPROF: profiling alarm clock"}'
  71 addsig _SIGWINCH   '{_SigNotify, "SIGWINCH: window size change"}'
  72 addsig _SIGSYS     '{_SigThrow, "SIGSYS: bad system call"}'
  73
  74 # Handle signals that are not supported on all systems.
  75
  76 checksig() {
  77     if grep "const $1 = " gen-sysinfo.go >/dev/null 2>&1 \
  78         && ! grep "const $1 = _SIG" gen-sysinfo.go > /dev/null 2>&1; then
  79         addsig $1 "$2"
  80     fi
  81 }
  82
  83 checksig _SIGSTKFLT  '{_SigThrow + _SigUnblock, "SIGSTKFLT: stack fault"}'
  84 checksig _SIGIO      '{_SigNotify, "SIGIO: i/o now possible"}'
  85 checksig _SIGPWR     '{_SigNotify, "SIGPWR: power failure restart"}'
  86 checksig _SIGEMT     '{_SigThrow, "SIGEMT: emulate instruction executed"}'
  87 checksig _SIGINFO    '{_SigNotify, "SIGINFO: status request from keyboard"}'
  88 checksig _SIGTHR     '{_SigNotify, "SIGTHR: reserved"}'
  89 checksig _SIGPOLL    '{_SigNotify, "SIGPOLL: pollable event occurred"}'
  90 checksig _SIGWAITING '{_SigNotify, "SIGWAITING: reserved signal no longer used by"}'
  91 checksig _SIGLWP     '{_SigNotify, "SIGLWP: reserved signal no longer used by"}'
  92 checksig _SIGFREEZE  '{_SigNotify, "SIGFREEZE: special signal used by CPR"}'
  93 checksig _SIGTHAW    '{_SigNotify, "SIGTHAW: special signal used by CPR"}'
  94 checksig _SIGCANCEL  '{_SigSetStack + _SigUnblock, "SIGCANCEL: reserved signal for thread cancellation"}'
  95 checksig _SIGXRES    '{_SigNotify, "SIGXRES: resource control exceeded"}'
  96 checksig _SIGJVM1    '{_SigNotify, "SIGJVM1: reserved signal for Java Virtual Machine"}'
  97 checksig _SIGJVM2    '{_SigNotify, "SIGJVM2: reserved signal for Java Virtual Machine"}'
  98 checksig _SIGLOST '   {_SigNotify, "SIGLOST: resource lost (Sun); server died (GNU)"}'
  99
 100 # Special handling of signals 32 and 33 on GNU/Linux systems,
 101 # because they are special to glibc.
 102 # Signal 34 is additionally special to Linux systems with musl.
 103 if test "${GOOS}" = "linux"; then
 104     SIGLIST=$SIGLIST"_32__33__34_"
 105     echo '      32: {_SigSetStack + _SigUnblock, "signal 32"}, /* SIGCANCEL; see issue 6997 */'
 106     echo '      33: {_SigSetStack + _SigUnblock, "signal 33"}, /* SIGSETXID; see issues 3871, 9400, 12498 */'
 107     echo '      34: {_SigSetStack + _SigUnblock, "signal 34"}, /* musl SIGSYNCCALL; see issue 39343 */'
 108 fi
 109
 110 if test "${GOOS}" = "aix"; then
 111     # _NSIG = _NSIG32/_NSIG64 and _NSIG* = _SIGMAX* + 1
 112     bits=`grep 'const _NSIG = _NSIG[0-9]*$' gen-sysinfo.go | sed -e 's/.* = _NSIG\([0-9]*\)/\1/'`
 113     nsig=`grep "const _SIGMAX$bits = [0-9]*$" gen-sysinfo.go | sed -e 's/.* = \([0-9]*\)/\1/'`
 114     nsig=`expr $nsig + 1`
 115 else
 116     nsig=`grep 'const _*NSIG = [0-9]*$' gen-sysinfo.go | sed -e 's/.* = \([0-9]*\)/\1/'`
 117     if test -z "$nsig"; then
 118         if grep 'const _*NSIG = [ (]*_*SIGRTMAX + 1[ )]*' gen-sysinfo.go >/dev/null 2>&1; then
 119             rtmax=`grep 'const _*SIGRTMAX = [0-9]*$' gen-sysinfo.go | sed -e 's/.* = \([0-9]*\)/\1/'`
 120             if test -n "$rtmax"; then
 121                 nsig=`expr $rtmax + 1`
 122             elif grep 'const _*SIGRTMAX = [ (]*_*SIGRTMIN[ )]*' gen-sysinfo.go >/dev/null 2>&1; then
 123                 rtmin=`grep 'const _*SIGRTMIN = [0-9]*$' gen-sysinfo.go | sed -e 's/.* = \([0-9]*\)/\1/'`
 124                 if test -n "$rtmin"; then
 125                     nsig=`expr $rtmin + 1`
 126                 fi
 127             fi
 128         fi
 129     fi
 130 fi
 131
 132 if test -z "$nsig"; then
 133     echo 1>&2 "could not determine number of signals"
 134     exit 1
 135 fi
 136
 137 i=1
 138 # Fill in the remaining signal numbers in sigtable
 139 while test "$i" -lt "$nsig"; do
 140     if ! echo $SIGLIST | grep "_${i}_" >/dev/null 2>&1; then
 141         echo "  $i: {_SigNotify, \"signal $i\"},"
 142     fi
 143     i=`expr "$i" + 1`
 144 done
 145 echo '}'