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: machine depend code for dynamic modules |
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6 | * |
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7 | * Provides: dynl_check_opened() |
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8 | * dynl_open() |
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9 | * dynl_sym() |
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10 | * dynl_error() |
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11 | * dynl_close() |
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12 | */ |
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13 | |
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14 | #include <stdio.h> |
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15 | #include <string.h> |
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16 | #include <ctype.h> |
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17 | #include <sys/stat.h> |
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18 | #include <errno.h> |
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19 | #include <unistd.h> |
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20 | |
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21 | |
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22 | #ifdef HAVE_CONFIG_H |
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23 | #include "libpolysconfig.h" |
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24 | #endif /* HAVE_CONFIG_H */ |
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25 | #include <misc/auxiliary.h> |
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26 | |
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27 | #include <omalloc/omalloc.h> |
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28 | |
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29 | #include <reporter/reporter.h> |
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30 | |
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31 | #include <resources/feResource.h> |
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32 | |
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33 | #include "mod_raw.h" |
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34 | |
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35 | #ifdef HAVE_STATIC |
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36 | #undef HAVE_DL |
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37 | #endif |
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38 | /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/ |
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39 | #if defined(HAVE_DL) |
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40 | |
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41 | /***************************************************************************** |
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42 | * |
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43 | * General section |
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44 | * These are just wrappers around the repsective dynl_* calls |
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45 | * which look for the binary in the bin_dir of Singular and ommit warnings if |
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46 | * somethings goes wrong |
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47 | * |
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48 | *****************************************************************************/ |
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49 | static BOOLEAN warn_handle = FALSE; |
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50 | static BOOLEAN warn_proc = FALSE; |
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51 | #ifndef DL_TAIL |
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52 | #ifdef NDEBUG |
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53 | #define DL_TAIL ".so" |
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54 | #else |
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55 | #define DL_TAIL ".so" |
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56 | //#define DL_TAIL "_g.so" |
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57 | #endif |
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58 | #endif |
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59 | |
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60 | void* dynl_open_binary_warn(const char* binary_name, const char* msg) |
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61 | { |
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62 | void* handle = NULL; |
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63 | char* binary_name_so=NULL; |
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64 | BOOLEAN found=FALSE; |
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65 | |
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66 | // try P_PROCS_DIR (%P) |
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67 | char* proc_path = feGetResource('P'); |
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68 | if (proc_path != NULL) |
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69 | { |
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70 | char *p; |
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71 | char *q; |
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72 | p=proc_path; |
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73 | int binary_name_so_length = 3 + strlen(DL_TAIL) + strlen(binary_name) + strlen(DIR_SEPP) + strlen(proc_path); |
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74 | binary_name_so = (char *)omAlloc0( binary_name_so_length * sizeof(char) ); |
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75 | while((p!=NULL)&&(*p!='\0')) |
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76 | { |
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77 | q=strchr(p,fePathSep); |
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78 | if (q!=NULL) *q='\0'; |
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79 | strcpy(binary_name_so,p); |
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80 | if (q!=NULL) *q=fePathSep; |
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81 | strcat(binary_name_so,DIR_SEPP); |
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82 | strcat(binary_name_so,binary_name); |
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83 | strcat(binary_name_so,DL_TAIL); |
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84 | if(!access(binary_name_so, R_OK)) { found=TRUE; break; } |
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85 | if (q!=NULL) p=q+1; else p=NULL; |
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86 | } |
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87 | if (found) handle = dynl_open(binary_name_so); |
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88 | } |
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89 | |
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90 | if (handle == NULL && ! warn_handle) |
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91 | { |
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92 | Warn("Could not find dynamic library: %s%s (path %s)", |
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93 | binary_name, DL_TAIL,proc_path); |
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94 | if (found) Warn("Error message from system: %s", dynl_error()); |
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95 | if (msg != NULL) Warn("%s", msg); |
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96 | Warn("See the INSTALL section in the Singular manual for details."); |
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97 | warn_handle = TRUE; |
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98 | } |
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99 | omfree((ADDRESS)binary_name_so ); |
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100 | |
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101 | return handle; |
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102 | } |
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103 | |
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104 | void* dynl_sym_warn(void* handle, const char* proc, const char* msg) |
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105 | { |
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106 | void *proc_ptr = NULL; |
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107 | if (handle != NULL) |
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108 | { |
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109 | proc_ptr = dynl_sym(handle, proc); |
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110 | if (proc_ptr == NULL && ! warn_proc) |
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111 | { |
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112 | Warn("Could load a procedure from a dynamic library"); |
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113 | Warn("Error message from system: %s", dynl_error()); |
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114 | if (msg != NULL) Warn("%s", msg); |
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115 | Warn("See the INSTALL section in the Singular manual for details."); |
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116 | warn_proc = TRUE; |
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117 | } |
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118 | } |
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119 | return proc_ptr; |
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120 | } |
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121 | |
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122 | #ifdef __cplusplus |
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123 | extern "C" { |
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124 | #endif |
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125 | |
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126 | /***************************************************************************** |
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127 | * SECTION generic ELF: ix86-linux / alpha-linux / IA64-linux /x86_64_Linux * |
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128 | * SunOS-5 / IRIX-6 / ppcMac-Darwin / FreeeBSD * |
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129 | *****************************************************************************/ |
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130 | // relying on gcc to define __ELF__, check with cpp -dM /dev/null |
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131 | #if defined(__ELF__) |
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132 | #define HAVE_ELF_SYSTEM |
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133 | #endif |
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134 | |
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135 | // Mac OsX is an ELF system, but does not define __ELF__ |
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136 | #if (defined(__APPLE__) && defined(__MACH__)) && (!defined(HAVE_ELF_SYSTEM)) |
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137 | #define HAVE_ELF_SYSTEM |
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138 | #endif |
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139 | |
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140 | // Solaris is an ELF system, but does not define __ELF__ |
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141 | #if defined(__sun) && defined(__SVR4) |
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142 | #define HAVE_ELF_SYSTEM |
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143 | #endif |
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144 | |
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145 | #if defined(HAVE_ELF_SYSTEM) |
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146 | #include <dlfcn.h> |
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147 | #define DL_IMPLEMENTED |
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148 | |
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149 | static void* kernel_handle = NULL; |
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150 | int dynl_check_opened( |
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151 | char *filename /* I: filename to check */ |
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152 | ) |
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153 | { |
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154 | return dlopen(filename,RTLD_NOW|RTLD_NOLOAD) != NULL; |
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155 | } |
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156 | |
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157 | void *dynl_open( |
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158 | char *filename /* I: filename to load */ |
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159 | ) |
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160 | { |
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161 | // glibc 2.2: |
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162 | if ((filename==NULL) || (dlopen(filename,RTLD_NOW|RTLD_NOLOAD)==NULL)) |
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163 | return(dlopen(filename, RTLD_NOW|RTLD_GLOBAL)); |
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164 | else |
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165 | Werror("module %s already loaded",filename); |
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166 | return NULL; |
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167 | // alternative |
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168 | // return(dlopen(filename, RTLD_NOW|RTLD_GLOBAL)); |
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169 | } |
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170 | |
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171 | void *dynl_sym(void *handle, const char *symbol) |
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172 | { |
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173 | if (handle == DYNL_KERNEL_HANDLE) |
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174 | { |
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175 | if (kernel_handle == NULL) |
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176 | kernel_handle = dynl_open(NULL); |
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177 | handle = kernel_handle; |
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178 | } |
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179 | return(dlsym(handle, symbol)); |
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180 | } |
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181 | |
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182 | int dynl_close (void *handle) |
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183 | { |
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184 | return(dlclose (handle)); |
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185 | } |
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186 | |
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187 | const char *dynl_error() |
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188 | { |
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189 | return(dlerror()); |
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190 | } |
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191 | #endif /* ELF_SYSTEM */ |
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192 | |
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193 | /***************************************************************************** |
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194 | * SECTION HPUX-9/10 * |
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195 | *****************************************************************************/ |
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196 | #if defined(HPUX_9) || defined(HPUX_10) |
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197 | #define DL_IMPLEMENTED |
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198 | #include <dl.h> |
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199 | |
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200 | typedef char *((*func_ptr) ()); |
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201 | |
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202 | int dynl_check_opened( /* NOTE: untested */ |
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203 | char *filename /* I: filename to check */ |
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204 | ) |
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205 | { |
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206 | struct shl_descriptor *desc; |
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207 | for (int idx = 0; shl_get(idx, &desc) != -1; ++idx) |
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208 | { |
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209 | if (strcmp(filename, desc->filename) == 0) return TRUE; |
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210 | } |
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211 | return FALSE; |
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212 | } |
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213 | |
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214 | void *dynl_open(char *filename) |
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215 | { |
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216 | shl_t handle = shl_load(filename, BIND_DEFERRED, 0); |
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217 | |
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218 | return ((void *) handle); |
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219 | } |
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220 | |
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221 | void *dynl_sym(void *handle, const char *symbol) |
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222 | { |
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223 | func_ptr f; |
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224 | |
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225 | if (handle == DYNL_KERNEL_HANDLE) |
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226 | handle = PROG_HANDLE; |
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227 | |
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228 | if (shl_findsym((shl_t *) & handle, symbol, TYPE_PROCEDURE, &f) == -1) |
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229 | { |
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230 | if (shl_findsym((shl_t *) & handle, symbol, TYPE_UNDEFINED, &f) == -1) |
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231 | { |
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232 | f = (func_ptr) NULL; |
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233 | } |
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234 | } |
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235 | return ((void *)f); |
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236 | } |
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237 | |
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238 | int dynl_close (void *handle) |
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239 | { |
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240 | shl_unload((shl_t) handle); |
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241 | return(0); |
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242 | } |
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243 | |
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244 | const char *dynl_error() |
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245 | { |
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246 | static char errmsg[] = "shl_load failed"; |
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247 | |
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248 | return errmsg; |
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249 | } |
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250 | #endif /* HPUX_9 or HPUX_10 */ |
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251 | |
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252 | /***************************************************************************** |
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253 | * SECTION generic: dynamic madules not available |
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254 | *****************************************************************************/ |
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255 | #ifndef DL_IMPLEMENTED |
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256 | |
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257 | int dynl_check_opened(char *filename) |
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258 | { |
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259 | return FALSE; |
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260 | } |
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261 | |
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262 | void *dynl_open(char *filename) |
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263 | { |
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264 | return(NULL); |
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265 | } |
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266 | |
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267 | void *dynl_sym(void *handle, const char *symbol) |
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268 | { |
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269 | return(NULL); |
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270 | } |
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271 | |
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272 | int dynl_close (void *handle) |
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273 | { |
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274 | return(0); |
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275 | } |
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276 | |
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277 | const char *dynl_error() |
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278 | { |
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279 | static char errmsg[] = "support for dynamic loading not implemented"; |
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280 | return errmsg; |
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281 | } |
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282 | #endif |
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283 | |
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284 | #ifdef __cplusplus |
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285 | } |
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286 | #endif |
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287 | |
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288 | #endif /* HAVE_DL */ |
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