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703 | serge | 1 | /**************************************************************************** |
2 | * |
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3 | * Open Watcom Project |
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4 | * |
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5 | * Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
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6 | * |
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7 | * ======================================================================== |
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8 | * |
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9 | * This file contains Original Code and/or Modifications of Original |
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10 | * Code as defined in and that are subject to the Sybase Open Watcom |
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11 | * Public License version 1.0 (the 'License'). You may not use this file |
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12 | * except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
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13 | * ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
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14 | * provided with the Original Code and Modifications, and is also |
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15 | * available at www.sybase.com/developer/opensource. |
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16 | * |
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17 | * The Original Code and all software distributed under the License are |
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18 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
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19 | * EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
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20 | * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
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21 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
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22 | * NON-INFRINGEMENT. Please see the License for the specific language |
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23 | * governing rights and limitations under the License. |
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24 | * |
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25 | * ======================================================================== |
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26 | * |
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27 | * Description: signal handling ( for DOS, Windows 3.x and ? Netware ) |
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28 | * |
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29 | ****************************************************************************/ |
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30 | |||
31 | |||
32 | #include "variety.h" |
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33 | #include |
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34 | #include |
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35 | //#include |
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36 | #include |
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37 | #include |
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38 | #include "rtdata.h" |
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39 | #include "sigtab.h" |
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40 | #include "sigfunc.h" |
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41 | #include "seterrno.h" |
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42 | |||
43 | #ifndef __WINDOWS_386__ |
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44 | #ifndef __NETWARE__ |
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45 | //extern void __grab_int23( void ); |
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46 | //extern void __restore_int23( void ); |
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47 | //extern void __grab_int_ctrl_break( void ); |
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48 | //extern void __restore_int_ctrl_break( void ); |
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49 | #endif |
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50 | #endif |
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51 | |||
52 | #define __SIGLAST SIGIOVFL |
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53 | |||
54 | static __sig_func SignalTable[] = { |
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55 | SIG_IGN, /* unused */ |
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56 | SIG_DFL, /* SIGABRT */ |
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57 | SIG_DFL, /* SIGFPE */ |
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58 | SIG_DFL, /* SIGILL */ |
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59 | SIG_DFL, /* SIGINT */ |
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60 | SIG_DFL, /* SIGSEGV */ |
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61 | SIG_DFL, /* SIGTERM */ |
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62 | SIG_DFL, /* SIGBREAK */ |
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63 | SIG_IGN, /* SIGUSR1 */ |
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64 | SIG_IGN, /* SIGUSR2 */ |
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65 | SIG_IGN, /* SIGUSR3 */ |
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66 | SIG_DFL, /* SIGIDIVZ */ |
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67 | SIG_DFL /* SIGIOVFL */ |
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68 | }; |
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69 | |||
70 | static FPEhandler *__old_FPE_handler = NULL; |
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71 | |||
72 | void __sigabort( void ) |
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73 | { |
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74 | raise( SIGABRT ); |
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75 | } |
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76 | |||
77 | //extern void _fpmath( void ); |
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78 | //#pragma aux _fpmath "__fpmath"; |
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79 | |||
80 | _WCRTLINK void __sigfpe_handler( int fpe_type ) |
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81 | { |
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82 | __sig_func func; |
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83 | |||
84 | func = SignalTable[ SIGFPE ]; |
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85 | if( func != SIG_IGN && func != SIG_DFL && func != SIG_ERR ) { |
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86 | SignalTable[ SIGFPE ] = SIG_DFL; /* 09-nov-87 FWC */ |
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87 | (*(__sigfpe_func)func)( SIGFPE, fpe_type ); /* so we can pass 2'nd parm */ |
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88 | } |
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89 | } |
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90 | |||
91 | _WCRTLINK __sig_func signal( int sig, __sig_func func ) |
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92 | { |
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93 | __sig_func prev_func; |
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94 | |||
95 | if(( sig < 1 ) || ( sig > __SIGLAST )) { |
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96 | __set_errno( EINVAL ); |
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97 | return( SIG_ERR ); |
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98 | } |
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99 | _RWD_abort = __sigabort; /* change the abort rtn address */ |
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100 | |||
101 | if( sig == SIGINT ) { |
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102 | if( func == SIG_DFL ) { |
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103 | // __restore_int23(); |
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104 | } else if( func != SIG_ERR ) { |
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105 | // __grab_int23(); |
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106 | } |
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107 | } else if( sig == SIGBREAK ) { |
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108 | if( func == SIG_DFL ) { |
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109 | // __restore_int_ctrl_break(); |
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110 | } else if( func != SIG_ERR ) { |
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111 | // __grab_int_ctrl_break(); |
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112 | } |
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113 | } else if( sig == SIGFPE ) { |
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114 | if( func == SIG_DFL ) { |
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115 | __restore_FPE_handler(); |
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116 | } else if( func != SIG_ERR ) { |
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117 | __grab_FPE_handler(); |
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118 | } |
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119 | } |
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120 | prev_func = _RWD_sigtab[ sig ]; |
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121 | _RWD_sigtab[ sig ] = func; |
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122 | return( prev_func ); |
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123 | } |
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124 | |||
125 | |||
126 | _WCRTLINK int raise( int sig ) |
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127 | { |
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128 | __sig_func func; |
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129 | |||
130 | func = _RWD_sigtab[ sig ]; |
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131 | switch( sig ) { |
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132 | case SIGFPE: |
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133 | __sigfpe_handler( FPE_EXPLICITGEN ); |
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134 | break; |
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135 | case SIGABRT: |
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136 | if( func == SIG_DFL ) { |
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137 | __terminate(); |
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138 | } |
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139 | case SIGINT: |
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140 | if( func != SIG_IGN && func != SIG_DFL && func != SIG_ERR ) { |
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141 | _RWD_sigtab[ sig ] = SIG_DFL; /* 09-nov-87 FWC */ |
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142 | // __restore_int23(); |
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143 | (*func)( sig ); |
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144 | } |
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145 | break; |
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146 | case SIGBREAK: |
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147 | if( func != SIG_IGN && func != SIG_DFL && func != SIG_ERR ) { |
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148 | _RWD_sigtab[ sig ] = SIG_DFL; /* 09-nov-87 FWC */ |
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149 | // __restore_int_ctrl_break(); |
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150 | (*func)( sig ); |
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151 | } |
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152 | break; |
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153 | case SIGILL: |
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154 | case SIGSEGV: |
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155 | case SIGTERM: |
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156 | case SIGUSR1: |
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157 | case SIGUSR2: |
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158 | case SIGUSR3: |
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159 | case SIGIDIVZ: |
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160 | case SIGIOVFL: |
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161 | if( func != SIG_IGN && func != SIG_DFL && func != SIG_ERR ) { |
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162 | _RWD_sigtab[ sig ] = SIG_DFL; /* 09-nov-87 FWC */ |
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163 | (*func)( sig ); |
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164 | } |
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165 | break; |
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166 | default: |
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167 | return( -1 ); |
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168 | } |
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169 | return( 0 ); |
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170 | } |
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171 | |||
172 | void __restore_FPE_handler( void ) |
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173 | { |
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174 | if( __old_FPE_handler == NULL ) { |
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175 | return; |
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176 | } |
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177 | __FPE_handler = __old_FPE_handler; |
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178 | __old_FPE_handler = NULL; |
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179 | } |
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180 | |||
181 | void __grab_FPE_handler( void ) |
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182 | { |
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183 | if( __old_FPE_handler == NULL ) { |
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184 | __old_FPE_handler = __FPE_handler; |
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185 | __FPE_handler = __sigfpe_handler; |
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186 | } |
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187 | }> |