1 | /* |
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2 | * ---------------------------------------------------------------------- |
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3 | * Rappture::rlimit |
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4 | * |
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5 | * This is an interface to the system getrlimit() and setrlimit() |
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6 | * routines. It allows you to get/set resource limits for child |
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7 | * executables. We use this in Rappture::exec, for example, to make |
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8 | * sure that jobs don't run forever or fill up the disk. |
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9 | * ====================================================================== |
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10 | * AUTHOR: Michael McLennan, Purdue University |
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11 | * Copyright (c) 2004-2006 Purdue Research Foundation |
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12 | * |
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13 | * See the file "license.terms" for information on usage and |
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14 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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15 | * ====================================================================== |
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16 | */ |
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17 | #include <tcl.h> |
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18 | #include <string.h> |
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19 | #ifndef _WIN32 |
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20 | #include <sys/time.h> |
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21 | #include <sys/resource.h> |
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22 | #else |
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23 | #include "RpWinResource.h" |
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24 | #endif |
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25 | |
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26 | #include <errno.h> |
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27 | #include "RpOp.h" |
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28 | |
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29 | static Tcl_ObjCmdProc RpRlimitCmd; |
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30 | static Tcl_ObjCmdProc RpRlimitGetOp; |
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31 | static Tcl_ObjCmdProc RpRlimitSetOp; |
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32 | static int RpRlimitOptionError(Tcl_Interp *interp, const char *string); |
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33 | |
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34 | /* |
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35 | * rlimit subcommands: |
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36 | */ |
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37 | static Rp_OpSpec rlimitOps[] = { |
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38 | {"get", 1, RpRlimitGetOp, 2, 4, "?-soft|-hard? ?option?",}, |
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39 | {"set", 1, RpRlimitSetOp, 2, 0, "?option value ...?",}, |
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40 | }; |
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41 | static int nRlimitOps = sizeof(rlimitOps) / sizeof(Rp_OpSpec); |
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42 | |
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43 | /* |
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44 | * rlimit configuration options: |
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45 | */ |
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46 | typedef struct RpRlimitNames { |
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47 | char *name; |
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48 | int resid; |
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49 | } RpRlimitNames; |
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50 | |
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51 | static RpRlimitNames rlimitOptions[] = { |
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52 | {"coresize", RLIMIT_CORE}, |
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53 | {"cputime", RLIMIT_CPU}, |
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54 | {"filesize", RLIMIT_FSIZE}, |
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55 | {(char*)NULL, 0} |
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56 | }; |
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57 | |
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58 | /* |
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59 | * ------------------------------------------------------------------------ |
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60 | * RpRlimit_Init() |
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61 | * |
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62 | * Called in Rappture_Init() to initialize the commands defined |
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63 | * in this file. |
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64 | * ------------------------------------------------------------------------ |
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65 | */ |
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66 | int |
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67 | RpRlimit_Init(interp) |
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68 | Tcl_Interp *interp; /* interpreter being initialized */ |
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69 | { |
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70 | Tcl_CreateObjCommand(interp, "::Rappture::rlimit", RpRlimitCmd, NULL, NULL); |
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71 | return TCL_OK; |
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72 | } |
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73 | |
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74 | /* |
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75 | * ------------------------------------------------------------------------ |
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76 | * RpRlimitCmd() |
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77 | * |
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78 | * Invoked whenever someone uses the "rlimit" command to get/set |
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79 | * limits for child processes. Handles the following syntax: |
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80 | * |
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81 | * rlimit get ?-soft|-hard? ?<option>? |
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82 | * rlimit set ?<option> <value> <option> <value> ...? |
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83 | * |
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84 | * Returns TCL_OK on success, and TCL_ERROR (along with an error |
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85 | * message in the interpreter) if anything goes wrong. |
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86 | * ------------------------------------------------------------------------ |
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87 | */ |
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88 | static int |
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89 | RpRlimitCmd(cdata, interp, objc, objv) |
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90 | ClientData cdata; /* not used */ |
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91 | Tcl_Interp *interp; /* interpreter handling this request */ |
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92 | int objc; /* number of command line args */ |
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93 | Tcl_Obj *const *objv; /* strings for command line args */ |
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94 | { |
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95 | Tcl_ObjCmdProc *proc; |
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96 | |
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97 | proc = Rp_GetOpFromObj(interp, nRlimitOps, rlimitOps, RP_OP_ARG1, |
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98 | objc, objv, 0); |
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99 | if (proc == NULL) { |
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100 | return TCL_ERROR; |
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101 | } |
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102 | return (*proc)(cdata, interp, objc, objv); |
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103 | } |
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104 | |
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105 | /* |
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106 | * ------------------------------------------------------------------------ |
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107 | * RpRlimitGetOp() |
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108 | * |
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109 | * Invoked whenever someone uses the "rlimit get" command to query |
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110 | * limits for child processes. Handles the following syntax: |
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111 | * |
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112 | * rlimit get ?-soft|-hard? ?<option>? |
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113 | * |
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114 | * Returns TCL_OK on success, and TCL_ERROR (along with an error |
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115 | * message in the interpreter) if anything goes wrong. |
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116 | * ------------------------------------------------------------------------ |
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117 | */ |
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118 | static int |
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119 | RpRlimitGetOp(cdata, interp, objc, objv) |
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120 | ClientData cdata; /* not used */ |
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121 | Tcl_Interp *interp; /* interpreter handling this request */ |
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122 | int objc; /* number of command line args */ |
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123 | Tcl_Obj *const *objv; /* strings for command line args */ |
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124 | { |
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125 | int hardlim = 0; /* default: use -soft limit */ |
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126 | int nextarg = 2; /* start with this arg */ |
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127 | Tcl_Obj *objPtr; |
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128 | int i, status; |
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129 | struct rlimit rvals; |
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130 | rlim_t *rvalptr; |
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131 | |
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132 | if (nextarg < objc) { |
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133 | const char *string; |
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134 | |
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135 | string = Tcl_GetString(objv[nextarg]); |
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136 | if (string[0] == '-') { |
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137 | if (strcmp(string,"-soft") == 0) { |
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138 | hardlim = 0; |
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139 | nextarg++; |
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140 | } else if (strcmp(string,"-hard") == 0) { |
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141 | hardlim = 1; |
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142 | nextarg++; |
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143 | } else { |
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144 | Tcl_AppendResult(interp, "bad option \"", string, |
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145 | "\": should be -soft or -hard", (char*)NULL); |
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146 | return TCL_ERROR; |
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147 | } |
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148 | } |
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149 | } |
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150 | |
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151 | /* |
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152 | * No args? Then return limits for all options. |
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153 | */ |
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154 | if (nextarg >= objc) { |
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155 | Tcl_Obj *listObjPtr; |
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156 | |
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157 | listObjPtr = Tcl_NewListObj(0, NULL); |
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158 | for (i=0; rlimitOptions[i].name != NULL; i++) { |
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159 | Tcl_Obj *objPtr; |
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160 | status = getrlimit(rlimitOptions[i].resid, &rvals); |
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161 | if (status != 0) { |
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162 | Tcl_ResetResult(interp); |
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163 | Tcl_AppendResult(interp, "unexpected rlimit failure", |
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164 | (char*)NULL); |
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165 | return TCL_ERROR; |
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166 | } |
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167 | if (hardlim) { |
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168 | rvalptr = &rvals.rlim_max; |
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169 | } else { |
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170 | rvalptr = &rvals.rlim_cur; |
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171 | } |
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172 | objPtr = Tcl_NewStringObj(rlimitOptions[i].name, -1); |
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173 | Tcl_ListObjAppendElement(interp, listObjPtr, objPtr); |
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174 | if (*rvalptr == RLIM_INFINITY) { |
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175 | objPtr = Tcl_NewStringObj("unlimited", -1); |
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176 | } else { |
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177 | objPtr = Tcl_NewLongObj((unsigned long)*rvalptr); |
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178 | } |
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179 | Tcl_ListObjAppendElement(interp, listObjPtr, objPtr); |
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180 | } |
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181 | Tcl_SetObjResult(interp, listObjPtr); |
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182 | return TCL_OK; |
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183 | } |
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184 | |
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185 | /* |
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186 | * Find the limit for the specified option. |
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187 | */ |
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188 | for (i=0; rlimitOptions[i].name != NULL; i++) { |
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189 | const char *string; |
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190 | |
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191 | string = Tcl_GetString(objv[nextarg]); |
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192 | if (strcmp(string, rlimitOptions[i].name) == 0) { |
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193 | break; |
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194 | } |
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195 | } |
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196 | if (rlimitOptions[i].name == NULL) { |
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197 | const char *string; |
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198 | |
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199 | string = Tcl_GetString(objv[nextarg]); |
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200 | return RpRlimitOptionError(interp, string); |
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201 | } |
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202 | |
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203 | status = getrlimit(rlimitOptions[i].resid, &rvals); |
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204 | if (status != 0) { |
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205 | Tcl_ResetResult(interp); |
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206 | Tcl_AppendResult(interp, "unexpected rlimit failure", |
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207 | (char*)NULL); |
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208 | return TCL_ERROR; |
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209 | } |
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210 | if (hardlim) { |
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211 | rvalptr = &rvals.rlim_max; |
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212 | } else { |
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213 | rvalptr = &rvals.rlim_cur; |
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214 | } |
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215 | |
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216 | if (*rvalptr == RLIM_INFINITY) { |
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217 | objPtr = Tcl_NewStringObj("unlimited", -1); |
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218 | } else { |
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219 | objPtr = Tcl_NewLongObj((unsigned long)*rvalptr); |
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220 | } |
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221 | Tcl_SetObjResult(interp, objPtr); |
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222 | return TCL_OK; |
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223 | } |
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224 | |
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225 | /* |
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226 | * ------------------------------------------------------------------------ |
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227 | * RpRlimitSetOp() |
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228 | * |
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229 | * Invoked whenever someone uses the "rlimit set" command to query |
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230 | * limits for child processes. Handles the following syntax: |
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231 | * |
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232 | * rlimit set ?<option> <value> <option> <value> ...? |
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233 | * |
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234 | * Returns TCL_OK on success, and TCL_ERROR (along with an error |
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235 | * message in the interpreter) if anything goes wrong. |
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236 | * ------------------------------------------------------------------------ |
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237 | */ |
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238 | static int |
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239 | RpRlimitSetOp(cdata, interp, objc, objv) |
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240 | ClientData cdata; /* not used */ |
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241 | Tcl_Interp *interp; /* interpreter handling this request */ |
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242 | int objc; /* number of command line args */ |
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243 | Tcl_Obj *const *objv; /* strings for command line args */ |
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244 | { |
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245 | int i, n, lim, status; |
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246 | struct rlimit rvals; |
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247 | rlim_t newval; |
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248 | |
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249 | for (n=2; n < objc; n += 2) { |
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250 | const char *name, *value; |
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251 | |
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252 | name = Tcl_GetString(objv[n]); |
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253 | if (n+1 >= objc) { |
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254 | Tcl_AppendResult(interp, "missing value for option \"", |
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255 | name, "\"", (char*)NULL); |
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256 | return TCL_ERROR; |
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257 | } |
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258 | value = Tcl_GetString(objv[n+1]); |
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259 | if (strcmp(value, "unlimited") == 0) { |
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260 | newval = RLIM_INFINITY; |
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261 | } else if (Tcl_GetIntFromObj(interp, objv[n+1], &lim) == TCL_OK) { |
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262 | if (lim < 0) { |
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263 | Tcl_ResetResult(interp); |
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264 | Tcl_AppendResult(interp, "bad value \"", value, |
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265 | "\": should be integer >= 0 or \"unlimited\"", |
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266 | (char*)NULL); |
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267 | return TCL_ERROR; |
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268 | } |
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269 | newval = (rlim_t)lim; |
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270 | } else { |
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271 | Tcl_ResetResult(interp); |
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272 | Tcl_AppendResult(interp, "bad value \"", value, |
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273 | "\": should be integer >= 0 or \"unlimited\"", (char*)NULL); |
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274 | return TCL_ERROR; |
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275 | } |
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276 | |
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277 | /* |
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278 | * Find the option being changed and set it. |
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279 | */ |
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280 | for (i=0; rlimitOptions[i].name != NULL; i++) { |
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281 | if (strcmp(name, rlimitOptions[i].name) == 0) { |
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282 | break; |
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283 | } |
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284 | } |
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285 | if (rlimitOptions[i].name == NULL) { |
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286 | return RpRlimitOptionError(interp, name); |
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287 | } |
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288 | status = getrlimit(rlimitOptions[i].resid, &rvals); |
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289 | if (status == 0) { |
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290 | rvals.rlim_cur = newval; |
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291 | status = setrlimit(rlimitOptions[i].resid, &rvals); |
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292 | } |
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293 | if (status == EPERM) { |
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294 | Tcl_ResetResult(interp); |
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295 | Tcl_AppendResult(interp, "value \"", value, |
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296 | "\" set too high for option \"", name, |
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297 | (char*)NULL); |
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298 | return TCL_ERROR; |
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299 | } else if (status != 0) { |
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300 | Tcl_ResetResult(interp); |
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301 | Tcl_AppendResult(interp, "unexpected rlimit failure", |
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302 | (char*)NULL); |
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303 | return TCL_ERROR; |
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304 | } |
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305 | } |
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306 | return TCL_OK; |
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307 | } |
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308 | |
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309 | /* |
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310 | * ------------------------------------------------------------------------ |
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311 | * RpRlimitOptionError() |
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312 | * |
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313 | * Used internally to set an error message in the interpreter |
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314 | * describing an unrecognized rlimit option. Sets the result of |
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315 | * the Tcl interpreter and returns an error status code. |
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316 | * ------------------------------------------------------------------------ |
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317 | */ |
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318 | static int |
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319 | RpRlimitOptionError(interp, option) |
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320 | Tcl_Interp *interp; /* interpreter handling this request */ |
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321 | const char *option; /* bad option supplied by the user */ |
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322 | { |
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323 | int i; |
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324 | |
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325 | Tcl_AppendResult(interp, "bad option \"", option, |
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326 | "\": should be one of ",(char*)NULL); |
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327 | |
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328 | for (i=0; rlimitOptions[i].name != NULL; i++) { |
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329 | if (i > 0) { |
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330 | Tcl_AppendResult(interp, ", ", (char*)NULL); |
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331 | } |
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332 | Tcl_AppendResult(interp, rlimitOptions[i].name, (char*)NULL); |
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333 | } |
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334 | return TCL_ERROR; |
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335 | } |
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