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1 /* syssignal.h - System-dependent definitions for signals.
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2 Copyright (C) 1992, 1993 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: FSF 19.30. */
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22
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23 #ifndef _XEMACS_SYSSIGNAL_H_
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24 #define _XEMACS_SYSSIGNAL_H_
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25
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26 /* In the old world, one could not #include <signal.h> here. The party line
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27 was that that header should always be #included before <config.h>, because
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28 some configuration files (like s/hpux.h) indicate that SIGIO doesn't work
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29 by #undef-ing SIGIO, and if this file #includes <signal.h>, then that will
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30 re-#define SIGIO and confuse things.
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31
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32 This was, however, a completely fucked up state of affairs, because on some
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33 systems it's necessary for the s/m files to #define things in order to get
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34 <signal.h> to provide the right typedefs, etc. And it's generally a broken
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35 concept for <config.h> to not be the very very first file included.
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36
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37 So instead of #undef'ing SIGIO in the various s/m files, I've changed them
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38 to define BROKEN_SIGIO instead, then we (syssignal.h) do an #undef SIGIO
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39 at the end, after including signal.h. Therefore, it's important that
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40 <signal.h> not be included after "syssignal.h", but that's the normal state:
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41 nothing should be directly including <signal.h> these days.
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42 -- jwz, 29-nov-93
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43 */
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44
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45 #include <signal.h>
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46 #include <errno.h>
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47
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48 /* SIGPOLL is the SVR4 signal. Those systems generally define
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49 SIGIO as an alias for SIGPOLL, but just in case ... */
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50
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51 #if !defined (SIGIO) && defined (SIGPOLL)
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52 # define SIGIO SIGPOLL
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53 #endif
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54
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55 #if defined (BROKEN_SIGIO)
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56 # undef SIGIO
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57 #endif
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58
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59 /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
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60 testing SIGCHLD. */
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61 #if !defined (VMS) && defined (SIGCLD) && !defined (SIGCHLD)
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62 # define SIGCHLD SIGCLD
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63 #endif /* SIGCHLD */
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64
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65 #ifdef BROKEN_SIGCHLD
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66 #undef SIGCHLD
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67 #endif
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68
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69 #ifdef SIGCHLD
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70 #define EMACS_BLOCK_SIGCHLD EMACS_BLOCK_SIGNAL (SIGCHLD)
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71 #define EMACS_UNBLOCK_SIGCHLD EMACS_UNBLOCK_SIGNAL (SIGCHLD)
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72 #else
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73 #define EMACS_BLOCK_SIGCHLD
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74 #define EMACS_UNBLOCK_SIGCHLD
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75 #endif
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76
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77 /* According to W.R. Stevens __Advanced Programming in the Unix
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78 Environment__, there are four different paradigms for handling
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79 signals. We use autoconf to tell us which one applies.
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80
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81 Note that on some systems, more than one paradigm is implemented
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82 (typically, the POSIX sigaction/sigprocmask and either the older
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83 SYSV or BSD way). In such a case, we prefer the POSIX way.
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84
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85 NOTE: We use EMACS_* macros for most signal operations, but
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86 just signal() for the standard signal-setting operation.
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87 Perhaps we should change this to EMACS_SIGNAL(), but that runs
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88 the risk of someone forgetting this convention and calling
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89 signal() directly. */
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90
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74
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91 typedef SIGTYPE (*signal_handler_t) (int);
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92
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0
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93 #if defined (HAVE_SIGPROCMASK)
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94
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95 /* The POSIX way (sigaction, sigprocmask, sigpending, sigsuspend) */
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96
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97 extern signal_handler_t sys_do_signal (int signal_number,
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98 signal_handler_t action);
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99 /* Provide our own version of signal(), that calls sigaction(). The
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100 name is not sys_signal() because a function of that name exists in
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101 libenergize.a */
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102 #undef signal
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103 #define signal sys_do_signal
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104
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105 #define EMACS_BLOCK_SIGNAL(sig) do \
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106 { \
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107 sigset_t _mask; \
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108 sigemptyset (&_mask); \
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109 sigaddset (&_mask, sig); \
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110 sigprocmask (SIG_BLOCK, &_mask, NULL); \
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111 } while (0)
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112 #define EMACS_UNBLOCK_SIGNAL(sig) do \
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113 { \
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114 sigset_t _mask; \
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115 sigemptyset (&_mask); \
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116 sigaddset (&_mask, sig); \
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117 sigprocmask (SIG_UNBLOCK, &_mask, NULL); \
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118 } while (0)
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119 #define EMACS_UNBLOCK_ALL_SIGNALS() do \
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120 { \
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121 sigset_t _mask; \
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122 sigemptyset (&_mask); \
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123 sigprocmask (SIG_SETMASK, &_mask, NULL); \
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124 } while (0)
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125 #define EMACS_WAIT_FOR_SIGNAL(sig) do \
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126 { \
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127 sigset_t _mask; \
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128 sigprocmask (0, NULL, &_mask); \
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129 sigdelset (&_mask, sig); \
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130 sigsuspend (&_mask); \
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131 } while (0)
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132 #define EMACS_REESTABLISH_SIGNAL(sig, handler)
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133
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134 #elif defined (HAVE_SIGBLOCK)
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135
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136 /* The older BSD way (signal/sigvec, sigblock, sigsetmask, sigpause) */
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137
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138 /* It's OK to use signal() here directly. No unreliable signal
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139 problems. However, we use sigvec() because it allows us to
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140 request interruptible I/O. */
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141
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142 #define signal sys_do_signal
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143
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144 /* Is it necessary to define sigmask like this? */
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145 #ifndef sigmask
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146 # define sigmask(no) (1L << ((no) - 1))
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147 #endif
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148
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149 #define EMACS_BLOCK_SIGNAL(sig) sigblock (sigmask (sig))
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150 #define EMACS_UNBLOCK_SIGNAL(sig) sigsetmask (sigblock (0) & ~sigmask (sig))
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151 #define EMACS_UNBLOCK_ALL_SIGNALS() sigsetmask (0)
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152 #define EMACS_WAIT_FOR_SIGNAL(sig) do \
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153 { \
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154 int _mask = sigblock (0); \
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155 sigpause (_mask & ~sigmask (sig)); \
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156 } while (0)
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157 #define EMACS_REESTABLISH_SIGNAL(sig, handler)
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158
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159 #elif defined (HAVE_SIGHOLD)
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160
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161 /* The older SYSV way (signal/sigset, sighold, sigrelse, sigignore,
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162 sigpause) */
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163
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164 #define signal sigset
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165 #define EMACS_BLOCK_SIGNAL(sig) sighold (sig)
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166 #define EMACS_UNBLOCK_SIGNAL(sig) sigrelse (sig)
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167 /* #### There's not really any simple way to implement this.
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168 Since EMACS_UNBLOCK_ALL_SIGNALS() is only called once (at startup),
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169 it's probably OK to just ignore it. */
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170 #define EMACS_UNBLOCK_ALL_SIGNALS() 0
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171 #define EMACS_WAIT_FOR_SIGNAL(sig) sigpause (sig)
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172 #define EMACS_REESTABLISH_SIGNAL(sig, handler)
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173
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174 #else
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175
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176 /* The oldest SYSV way (signal only; unreliable signals) */
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177
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178 /* Old USG systems don't really have signal blocking.
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179 We indicate this by not defining EMACS_BLOCK_SIGNAL or
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180 EMACS_WAIT_FOR_SIGNAL. */
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181 #define EMACS_UNBLOCK_SIGNAL(sig) 0
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182 #define EMACS_UNBLOCK_ALL_SIGNALS() 0
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183 #define EMACS_REESTABLISH_SIGNAL(sig, handler) do \
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184 { \
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185 int old_errno = errno; \
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186 signal (sig, handler); \
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187 errno = old_errno; \
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188 } while (0)
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189
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190 /* Under SYSV, setting a signal handler for SIGCLD causes
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191 SIGCLD to immediately be sent if there any unwaited processes
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192 out there. This means that the SIGCLD handler *must* call
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193 wait() to reap the status of all processes -- it cannot
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194 simply set a flag and then reestablish the handler, because
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195 it will get called again, infinitely. We only need to
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196 worry about this on systems where signals need to be
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197 reestablished (SYSV Release 2 and earlier). */
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198 #define OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
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199
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200 #endif
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201
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202 /* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
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203 Must do that using the killpg call. */
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204 #ifdef BSD
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205 #define EMACS_KILLPG(gid, signo) killpg (gid, signo)
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206 #else
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207 #ifdef WINDOWSNT
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208 #define EMACS_KILLPG(gid, signo) (win32_kill_process (gid, signo))
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209 #else
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210 #define EMACS_KILLPG(gid, signo) kill (-(gid), signo)
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211 #endif
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212 #endif
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213
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214 #ifdef VMS
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215 # define sys_siglist sys_errlist
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216 # define NSIG sys_nerr
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217 #endif /* VMS */
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218
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219 #ifndef NSIG
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220 # define NSIG (SIGUSR2+1) /* guess how many elements are in sys_siglist... */
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221 #endif
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222
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223 /* SYS_SIGLIST_DECLARED is determined by configure. On Linux, it seems,
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224 configure incorrectly fails to find it, so s/linux.h defines
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225 HAVE_SYS_SIGLIST. */
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226 #if !defined (SYS_SIGLIST_DECLARED) && !defined (HAVE_SYS_SIGLIST)
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227 extern CONST char *sys_siglist[];
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228 #endif
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229
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230 #ifdef SIGDANGER
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231 extern SIGTYPE memory_warning_signal (int sig);
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232 #endif
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233
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234 #endif /* _XEMACS_SYSSIGNAL_H_ */
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