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