1 | /**************************************** |
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2 | * Computer Algebra System SINGULAR * |
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3 | ****************************************/ |
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4 | /* $Id: cntrlc.cc,v 1.59 2009-03-19 10:33:14 Singular Exp $ */ |
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5 | /* |
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6 | * ABSTRACT - interupt handling |
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7 | */ |
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8 | |
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9 | /* includes */ |
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10 | #ifdef DecAlpha_OSF1 |
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11 | #define _XOPEN_SOURCE_EXTENDED |
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12 | #endif /* MP3-Y2 0.022UF */ |
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13 | #include <stdio.h> |
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14 | #include <stddef.h> |
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15 | #include <stdlib.h> |
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16 | #include <strings.h> |
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17 | #include <signal.h> |
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18 | #include "mod2.h" |
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19 | #include "omalloc.h" |
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20 | #include "tok.h" |
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21 | #include "ipshell.h" |
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22 | #include "febase.h" |
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23 | #include "cntrlc.h" |
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24 | #include "polys.h" |
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25 | #include "feOpt.h" |
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26 | #include "version.h" |
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27 | |
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28 | /* undef, if you don't want GDB to come up on error */ |
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29 | |
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30 | #if !defined(__alpha) |
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31 | #define CALL_GDB |
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32 | #endif |
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33 | |
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34 | #if defined(__OPTIMIZE__) && defined(CALL_GDB) |
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35 | #undef CALL_GDB |
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36 | #endif |
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37 | |
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38 | #if defined(unix) && !defined(hpux) |
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39 | #include <unistd.h> |
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40 | #include <sys/types.h> |
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41 | |
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42 | #ifdef TIME_WITH_SYS_TIME |
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43 | #include <time.h> |
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44 | #ifdef HAVE_SYS_TIME_H |
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45 | #include <sys/time.h> |
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46 | #endif |
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47 | #else |
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48 | #ifdef HAVE_SYS_TIME_H |
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49 | #include <sys/time.h> |
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50 | #else |
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51 | #include <time.h> |
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52 | #endif |
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53 | #endif |
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54 | #ifdef HAVE_SYS_TIMES_H |
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55 | #include <sys/times.h> |
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56 | #endif |
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57 | |
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58 | #define INTERACTIVE 0 |
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59 | #define STACK_TRACE 1 |
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60 | |
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61 | #ifdef CALL_GDB |
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62 | static void debug (int); |
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63 | static void debug_stop (char *const*args); |
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64 | #endif |
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65 | #ifndef __OPTIMIZE__ |
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66 | static void stack_trace_sigchld (int); |
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67 | static void stack_trace (char *const*args); |
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68 | #endif |
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69 | #endif |
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70 | |
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71 | /*---------------------------------------------------------------------* |
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72 | * File scope Variables (Variables share by several functions in |
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73 | * the same file ) |
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74 | * |
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75 | *---------------------------------------------------------------------*/ |
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76 | /* data */ |
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77 | jmp_buf si_start_jmpbuf; |
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78 | int siRandomStart; |
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79 | short si_restart=0; |
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80 | BOOLEAN siCntrlc = FALSE; |
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81 | |
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82 | typedef void (*si_hdl_typ)(int); |
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83 | |
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84 | |
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85 | /*0 implementation*/ |
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86 | /*---------------------------------------------------------------------* |
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87 | * Functions declarations |
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88 | * |
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89 | *---------------------------------------------------------------------*/ |
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90 | void sigint_handler(int sig); |
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91 | |
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92 | si_hdl_typ si_set_signal ( int sig, si_hdl_typ signal_handler); |
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93 | |
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94 | /*---------------------------------------------------------------------*/ |
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95 | /** |
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96 | * @brief meta function for binding a signal to an handler |
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97 | |
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98 | @param[in] sig Signal number |
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99 | @param[in] signal_handler Pointer to signal handler |
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100 | |
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101 | @return value of signal() |
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102 | **/ |
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103 | /*---------------------------------------------------------------------*/ |
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104 | si_hdl_typ si_set_signal ( |
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105 | int sig, |
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106 | si_hdl_typ signal_handler |
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107 | ) |
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108 | { |
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109 | si_hdl_typ retval=signal (sig, (si_hdl_typ)signal_handler); |
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110 | if (retval == SIG_ERR) |
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111 | { |
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112 | fprintf(stderr, "Unable to init signal %d ... exiting...\n", sig); |
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113 | } |
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114 | #ifdef HAVE_SIGINTERRUPT |
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115 | siginterrupt(sig, 1); |
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116 | #endif |
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117 | return retval; |
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118 | } /* si_set_signal */ |
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119 | |
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120 | |
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121 | /*---------------------------------------------------------------------*/ |
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122 | #if defined(ix86_Linux) |
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123 | #if !defined(HAVE_SIGCONTEXT) && !defined(HAVE_ASM_SIGCONTEXT_H) |
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124 | // we need the following structure sigcontext_struct. |
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125 | // if configure finds asm/singcontext.h we assume |
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126 | // that this file contains the structure and is included |
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127 | // via signal.h |
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128 | struct sigcontext_struct { |
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129 | unsigned short gs, __gsh; |
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130 | unsigned short fs, __fsh; |
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131 | unsigned short es, __esh; |
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132 | unsigned short ds, __dsh; |
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133 | unsigned long edi; |
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134 | unsigned long esi; |
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135 | unsigned long ebp; |
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136 | unsigned long esp; |
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137 | unsigned long ebx; |
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138 | unsigned long edx; |
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139 | unsigned long ecx; |
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140 | unsigned long eax; |
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141 | unsigned long trapno; |
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142 | unsigned long err; |
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143 | unsigned long eip; |
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144 | unsigned short cs, __csh; |
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145 | unsigned long eflags; |
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146 | unsigned long esp_at_signal; |
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147 | unsigned short ss, __ssh; |
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148 | unsigned long i387; |
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149 | unsigned long oldmask; |
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150 | unsigned long cr2; |
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151 | }; |
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152 | #endif |
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153 | #define HAVE_SIGSTRUCT |
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154 | typedef struct sigcontext_struct sigcontext; |
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155 | #endif |
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156 | |
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157 | #if defined(x86_64_Linux) |
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158 | #define HAVE_SIGSTRUCT |
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159 | #endif |
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160 | |
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161 | |
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162 | #if defined(HAVE_SIGSTRUCT) |
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163 | /*2---------------------------------------------------------------------*/ |
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164 | /** |
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165 | * @brief signal handler for run time errors, linux/i386, x86_64 version |
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166 | |
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167 | @param[in] sig |
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168 | @param[in] s |
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169 | **/ |
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170 | /*---------------------------------------------------------------------*/ |
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171 | void sigsegv_handler(int sig, sigcontext s) |
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172 | { |
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173 | fprintf(stderr,"Singular : signal %d (v: %d/%u):\n",sig,SINGULAR_VERSION,feVersionId); |
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174 | if (sig!=SIGINT) |
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175 | { |
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176 | fprintf(stderr,"current line:>>%s<<\n",my_yylinebuf); |
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177 | fprintf(stderr,"Segment fault/Bus error occurred at %lx because of %lx (r:%d)\n" |
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178 | "please inform the authors\n", |
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179 | #ifdef __i386__ |
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180 | (long)s.eip, |
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181 | #else /* x86_64*/ |
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182 | (long)s.rip, |
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183 | #endif |
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184 | (long)s.cr2,siRandomStart); |
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185 | } |
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186 | #ifdef __OPTIMIZE__ |
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187 | if(si_restart<3) |
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188 | { |
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189 | si_restart++; |
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190 | fprintf(stderr,"trying to restart...\n"); |
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191 | init_signals(); |
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192 | longjmp(si_start_jmpbuf,1); |
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193 | } |
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194 | #endif /* __OPTIMIZE__ */ |
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195 | #ifdef CALL_GDB |
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196 | if (sig!=SIGINT) debug(INTERACTIVE); |
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197 | #endif /* CALL_GDB */ |
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198 | exit(0); |
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199 | } |
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200 | |
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201 | /*---------------------------------------------------------------------*/ |
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202 | /** |
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203 | * @brief additional default signal handler |
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204 | |
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205 | // some newer Linux version cannot have SIG_IGN for SIGCHLD, |
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206 | // so use this nice routine here: |
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207 | // SuSe 9.x reports -1 always |
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208 | // Redhat 9.x/FC x reports sometimes -1 |
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209 | // see also: hpux_system |
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210 | |
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211 | @param[in] sig |
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212 | **/ |
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213 | /*---------------------------------------------------------------------*/ |
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214 | void sig_ign_hdl(int sig) |
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215 | { |
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216 | } |
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217 | |
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218 | /*2 |
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219 | * init signal handlers, linux/i386 version |
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220 | */ |
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221 | void init_signals() |
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222 | { |
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223 | /*4 signal handler: linux*/ |
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224 | if (SIG_ERR==si_set_signal(SIGSEGV,(si_hdl_typ)sigsegv_handler)) |
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225 | { |
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226 | PrintS("cannot set signal handler for SEGV\n"); |
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227 | } |
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228 | if (SIG_ERR==si_set_signal(SIGFPE, (si_hdl_typ)sigsegv_handler)) |
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229 | { |
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230 | PrintS("cannot set signal handler for FPE\n"); |
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231 | } |
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232 | if (SIG_ERR==si_set_signal(SIGILL, (si_hdl_typ)sigsegv_handler)) |
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233 | { |
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234 | PrintS("cannot set signal handler for ILL\n"); |
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235 | } |
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236 | if (SIG_ERR==si_set_signal(SIGIOT, (si_hdl_typ)sigsegv_handler)) |
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237 | { |
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238 | PrintS("cannot set signal handler for IOT\n"); |
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239 | } |
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240 | if (SIG_ERR==si_set_signal(SIGINT ,(si_hdl_typ)sigint_handler)) |
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241 | { |
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242 | PrintS("cannot set signal handler for INT\n"); |
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243 | } |
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244 | //si_set_signal(SIGCHLD, (void (*)(int))SIG_IGN); |
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245 | si_set_signal(SIGCHLD, (si_hdl_typ)sig_ign_hdl); |
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246 | } |
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247 | |
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248 | /*---------------------------------------------------------------------*/ |
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249 | #elif defined(SunOS) /*SPARC_SUNOS*/ |
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250 | /*2 |
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251 | * signal handler for run time errors, sparc sunos 4 version |
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252 | */ |
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253 | void sigsegv_handler(int sig, int code, struct sigcontext *scp, char *addr) |
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254 | { |
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255 | fprintf(stderr,"Singular : signal %d, code %d (v: %d/%u):\n", |
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256 | sig,code,SINGULAR_VERSION,feVersionId); |
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257 | if ((sig!=SIGINT)&&(sig!=SIGABRT)) |
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258 | { |
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259 | fprintf(stderr,"current line:>>%s<<\n",my_yylinebuf); |
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260 | fprintf(stderr,"Segment fault/Bus error occurred at %x (r:%d)\n" |
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261 | "please inform the authors\n", |
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262 | (int)addr,siRandomStart); |
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263 | } |
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264 | #ifdef __OPTIMIZE__ |
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265 | if(si_restart<3) |
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266 | { |
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267 | si_restart++; |
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268 | fprintf(stderr,"trying to restart...\n"); |
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269 | init_signals(); |
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270 | longjmp(si_start_jmpbuf,1); |
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271 | } |
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272 | #endif /* __OPTIMIZE__ */ |
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273 | #ifdef CALL_GDB |
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274 | if (sig!=SIGINT) debug(STACK_TRACE); |
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275 | #endif /* CALL_GDB */ |
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276 | exit(0); |
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277 | } |
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278 | |
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279 | /*2 |
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280 | * init signal handlers, sparc sunos 4 version |
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281 | */ |
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282 | void init_signals() |
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283 | { |
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284 | /*4 signal handler:*/ |
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285 | si_set_signal(SIGSEGV,sigsegv_handler); |
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286 | si_set_signal(SIGBUS, sigsegv_handler); |
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287 | si_set_signal(SIGFPE, sigsegv_handler); |
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288 | si_set_signal(SIGILL, sigsegv_handler); |
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289 | si_set_signal(SIGIOT, sigsegv_handler); |
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290 | si_set_signal(SIGINT ,sigint_handler); |
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291 | si_set_signal(SIGCHLD, (void (*)(int))SIG_IGN); |
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292 | } |
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293 | #else |
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294 | |
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295 | /*---------------------------------------------------------------------*/ |
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296 | /*2 |
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297 | * signal handler for run time errors, general version |
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298 | */ |
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299 | void sigsegv_handler(int sig) |
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300 | { |
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301 | fprintf(stderr,"Singular : signal %d (v: %d/%u):\n", |
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302 | sig,SINGULAR_VERSION,feVersionId); |
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303 | if (sig!=SIGINT) |
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304 | { |
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305 | fprintf(stderr,"current line:>>%s<<\n",my_yylinebuf); |
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306 | fprintf(stderr,"Segment fault/Bus error occurred (r:%d)\n" |
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307 | "please inform the authors\n", |
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308 | siRandomStart); |
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309 | } |
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310 | #ifdef __OPTIMIZE__ |
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311 | if(si_restart<3) |
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312 | { |
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313 | si_restart++; |
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314 | fprintf(stderr,"trying to restart...\n"); |
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315 | init_signals(); |
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316 | longjmp(si_start_jmpbuf,1); |
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317 | } |
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318 | #endif /* __OPTIMIZE__ */ |
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319 | #if defined(unix) && !defined(hpux) |
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320 | /* debug(..) does not work under HPUX (because ptrace does not work..) */ |
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321 | #ifdef CALL_GDB |
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322 | if (sig!=SIGINT) debug(STACK_TRACE); |
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323 | #endif /* CALL_GDB */ |
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324 | #endif /* unix */ |
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325 | exit(0); |
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326 | } |
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327 | |
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328 | /*2 |
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329 | * init signal handlers, general version |
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330 | */ |
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331 | void init_signals() |
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332 | { |
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333 | /*4 signal handler:*/ |
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334 | si_set_signal(SIGSEGV,(void (*) (int))sigsegv_handler); |
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335 | #ifdef SIGBUS |
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336 | si_set_signal(SIGBUS, sigsegv_handler); |
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337 | #endif /* SIGBUS */ |
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338 | #ifdef SIGFPE |
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339 | si_set_signal(SIGFPE, sigsegv_handler); |
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340 | #endif /* SIGFPE */ |
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341 | #ifdef SIGILL |
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342 | si_set_signal(SIGILL, sigsegv_handler); |
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343 | #endif /* SIGILL */ |
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344 | #ifdef SIGIOT |
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345 | si_set_signal(SIGIOT, sigsegv_handler); |
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346 | #endif /* SIGIOT */ |
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347 | #ifdef SIGXCPU |
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348 | si_set_signal(SIGXCPU, (void (*)(int))SIG_IGN); |
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349 | #endif /* SIGIOT */ |
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350 | si_set_signal(SIGINT ,sigint_handler); |
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351 | #if defined(HPUX_9) || defined(HPUX_10) |
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352 | si_set_signal(SIGCHLD, (void (*)(int))SIG_IGN); |
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353 | #endif |
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354 | } |
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355 | #endif |
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356 | |
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357 | |
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358 | /*2 |
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359 | * signal handler for SIGINT |
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360 | */ |
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361 | void sigint_handler(int sig) |
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362 | { |
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363 | mflush(); |
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364 | #ifdef HAVE_FEREAD |
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365 | if (fe_is_raw_tty) fe_temp_reset(); |
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366 | #endif /* HAVE_FEREAD */ |
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367 | loop |
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368 | { |
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369 | int cnt=0; |
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370 | int c; |
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371 | fprintf(stderr,"// ** Interrupt at cmd:`%s` in line:'%s'\n", |
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372 | Tok2Cmdname(iiOp),my_yylinebuf); |
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373 | if (feGetOptValue(FE_OPT_EMACS) == NULL) |
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374 | { |
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375 | fputs("abort command(a), continue(c) or quit Singular(q) ?",stderr);fflush(stderr); |
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376 | c = fgetc(stdin); |
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377 | } |
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378 | else |
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379 | { |
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380 | c = 'a'; |
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381 | } |
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382 | |
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383 | switch(c) |
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384 | { |
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385 | case 'q': |
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386 | m2_end(2); |
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387 | case 'r': |
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388 | longjmp(si_start_jmpbuf,1); |
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389 | case 'b': |
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390 | VoiceBackTrack(); |
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391 | break; |
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392 | case 'a': |
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393 | siCntrlc++; |
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394 | case 'c': |
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395 | if (feGetOptValue(FE_OPT_EMACS) == NULL) fgetc(stdin); |
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396 | si_set_signal(SIGINT ,(si_hdl_typ)sigint_handler); |
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397 | return; |
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398 | //siCntrlc ++; |
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399 | //if (siCntrlc>2) si_set_signal(SIGINT,(si_hdl_typ) sigsegv_handler); |
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400 | //else si_set_signal(SIGINT,(si_hdl_typ) sigint_handler); |
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401 | } |
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402 | cnt++; |
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403 | if(cnt>5) m2_end(2); |
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404 | } |
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405 | } |
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406 | |
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407 | //void test_int() |
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408 | //{ |
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409 | // if (siCntrlc!=0) |
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410 | // { |
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411 | // int saveecho = si_echo; |
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412 | // siCntrlc = FALSE; |
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413 | // si_set_signal(SIGINT ,sigint_handler); |
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414 | // iiDebug(); |
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415 | // si_echo = saveecho; |
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416 | // } |
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417 | //} |
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418 | |
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419 | #ifdef unix |
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420 | # ifndef hpux |
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421 | # ifndef __OPTIMIZE__ |
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422 | int si_stop_stack_trace_x; |
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423 | # ifdef CALL_GDB |
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424 | static void debug (int method) |
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425 | { |
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426 | if (feOptValue(FE_OPT_NO_TTY)) |
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427 | { |
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428 | dReportError("Caught Signal 11"); |
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429 | return; |
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430 | } |
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431 | int pid; |
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432 | char buf[16]; |
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433 | char * args[4] = { (char*)"gdb", (char*)"Singularg", NULL, NULL }; |
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434 | |
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435 | #ifdef HAVE_FEREAD |
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436 | if (fe_is_raw_tty) fe_temp_reset(); |
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437 | #endif /* HAVE_FEREAD */ |
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438 | |
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439 | sprintf (buf, "%d", getpid ()); |
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440 | |
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441 | args[2] = buf; |
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442 | |
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443 | pid = fork (); |
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444 | if (pid == 0) |
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445 | { |
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446 | switch (method) |
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447 | { |
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448 | case INTERACTIVE: |
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449 | fprintf (stderr, "debug_stop\n"); |
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450 | debug_stop (args); |
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451 | break; |
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452 | #ifndef __OPTIMIZE__ |
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453 | case STACK_TRACE: |
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454 | fprintf (stderr, "stack_trace\n"); |
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455 | stack_trace (args); |
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456 | break; |
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457 | #endif |
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458 | default: |
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459 | // should not be reached: |
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460 | exit(1); |
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461 | } |
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462 | } |
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463 | else if (pid == -1) |
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464 | { |
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465 | perror ("could not fork"); |
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466 | return; |
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467 | } |
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468 | |
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469 | si_stop_stack_trace_x = 1; |
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470 | while (si_stop_stack_trace_x) ; |
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471 | } |
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472 | |
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473 | static void debug_stop (char *const*args) |
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474 | { |
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475 | execvp (args[0], args); |
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476 | perror ("exec failed"); |
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477 | _exit (0); |
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478 | } |
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479 | # endif /* CALL_GDB */ |
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480 | |
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481 | static int stack_trace_done; |
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482 | |
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483 | static void stack_trace (char *const*args) |
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484 | { |
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485 | int pid; |
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486 | int in_fd[2]; |
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487 | int out_fd[2]; |
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488 | fd_set fdset; |
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489 | fd_set readset; |
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490 | struct timeval tv; |
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491 | int sel, index, state; |
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492 | char buffer[256]; |
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493 | char c; |
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494 | |
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495 | stack_trace_done = 0; |
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496 | |
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497 | signal (SIGCHLD, stack_trace_sigchld); |
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498 | |
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499 | if ((pipe (in_fd) == -1) || (pipe (out_fd) == -1)) |
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500 | { |
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501 | perror ("could open pipe"); |
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502 | m2_end(999); |
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503 | } |
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504 | |
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505 | pid = fork (); |
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506 | if (pid == 0) |
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507 | { |
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508 | close (0); dup2 (in_fd[0],0); /* set the stdin to the in pipe */ |
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509 | close (1); dup2 (out_fd[1],1); /* set the stdout to the out pipe */ |
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510 | close (2); dup2 (out_fd[1],2); /* set the stderr to the out pipe */ |
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511 | |
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512 | execvp (args[0], args); /* exec gdb */ |
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513 | perror ("exec failed"); |
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514 | m2_end(999); |
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515 | } |
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516 | else if (pid == -1) |
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517 | { |
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518 | perror ("could not fork"); |
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519 | m2_end(999); |
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520 | } |
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521 | |
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522 | FD_ZERO (&fdset); |
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523 | FD_SET (out_fd[0], &fdset); |
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524 | |
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525 | write (in_fd[1], "backtrace\n", 10); |
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526 | write (in_fd[1], "p si_stop_stack_trace_x = 0\n", 28); |
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527 | write (in_fd[1], "quit\n", 5); |
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528 | |
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529 | index = 0; |
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530 | state = 0; |
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531 | |
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532 | loop |
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533 | { |
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534 | readset = fdset; |
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535 | tv.tv_sec = 1; |
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536 | tv.tv_usec = 0; |
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537 | |
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538 | # ifdef hpux |
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539 | sel = select (FD_SETSIZE, (int *)readset.fds_bits, NULL, NULL, &tv); |
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540 | # else /* hpux */ |
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541 | sel = select (FD_SETSIZE, &readset, NULL, NULL, &tv); |
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542 | # endif /* hpux */ |
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543 | if (sel == -1) |
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544 | break; |
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545 | |
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546 | if ((sel > 0) && (FD_ISSET (out_fd[0], &readset))) |
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547 | { |
---|
548 | if (read (out_fd[0], &c, 1)) |
---|
549 | { |
---|
550 | switch (state) |
---|
551 | { |
---|
552 | case 0: |
---|
553 | if (c == '#') |
---|
554 | { |
---|
555 | state = 1; |
---|
556 | index = 0; |
---|
557 | buffer[index++] = c; |
---|
558 | } |
---|
559 | break; |
---|
560 | case 1: |
---|
561 | buffer[index++] = c; |
---|
562 | if ((c == '\n') || (c == '\r')) |
---|
563 | { |
---|
564 | buffer[index] = 0; |
---|
565 | fprintf (stderr, "%s", buffer); |
---|
566 | state = 0; |
---|
567 | index = 0; |
---|
568 | } |
---|
569 | break; |
---|
570 | default: |
---|
571 | break; |
---|
572 | } |
---|
573 | } |
---|
574 | } |
---|
575 | else if (stack_trace_done) |
---|
576 | break; |
---|
577 | } |
---|
578 | |
---|
579 | close (in_fd[0]); |
---|
580 | close (in_fd[1]); |
---|
581 | close (out_fd[0]); |
---|
582 | close (out_fd[1]); |
---|
583 | m2_end(0); |
---|
584 | } |
---|
585 | |
---|
586 | static void stack_trace_sigchld (int signum) |
---|
587 | { |
---|
588 | stack_trace_done = 1; |
---|
589 | } |
---|
590 | |
---|
591 | # endif /* !__OPTIMIZE__ */ |
---|
592 | # endif /* !hpux */ |
---|
593 | #endif /* unix */ |
---|
594 | |
---|
595 | /* Under HPUX 9, system(...) returns -1 if SIGCHLD does not equal |
---|
596 | SIG_DFL. However, if it stays at SIG_DFL we get zombie processes |
---|
597 | for terminated childs generated by fork. Therefors some special treatment |
---|
598 | is necessary */ |
---|
599 | #ifdef HPUX_9 |
---|
600 | # undef system |
---|
601 | extern "C" { |
---|
602 | int hpux9_system(const char* call) |
---|
603 | { |
---|
604 | int ret; |
---|
605 | si_set_signal(SIGCHLD, (void (*)(int))SIG_DFL); |
---|
606 | ret = system(call); |
---|
607 | si_set_signal(SIGCHLD, (void (*)(int))SIG_IGN); |
---|
608 | return ret; |
---|
609 | } |
---|
610 | } |
---|
611 | #endif /* HPUX_9 */ |
---|