Mercurial > trustbridge > nss-cmake-static

annotate nss/lib/base/error.c @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* This Source Code Form is subject to the terms of the Mozilla Public
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2 * License, v. 2.0. If a copy of the MPL was not distributed with this
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3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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4
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5 /*
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6 * error.c
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7 *
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8 * This file contains the code implementing the per-thread error
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9 * stacks upon which most NSS routines report their errors.
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10 */
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11
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12 #ifndef BASE_H
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13 #include "base.h"
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14 #endif /* BASE_H */
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15 #include <limits.h> /* for UINT_MAX */
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16 #include <string.h> /* for memmove */
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17
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18 #define NSS_MAX_ERROR_STACK_COUNT 16 /* error codes */
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19
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20 /*
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21 * The stack itself has a header, and a sequence of integers.
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22 * The header records the amount of space (as measured in stack
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23 * slots) already allocated for the stack, and the count of the
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24 * number of records currently being used.
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25 */
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26
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27 struct stack_header_str {
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28 PRUint16 space;
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29 PRUint16 count;
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30 };
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31
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32 struct error_stack_str {
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33 struct stack_header_str header;
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34 PRInt32 stack[1];
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35 };
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36 typedef struct error_stack_str error_stack;
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37
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38 /*
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39 * error_stack_index
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40 *
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41 * Thread-private data must be indexed. This is that index.
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42 * See PR_NewThreadPrivateIndex for more information.
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43 *
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44 * Thread-private data indexes are in the range [0, 127].
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45 */
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46
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47 #define INVALID_TPD_INDEX UINT_MAX
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48 static PRUintn error_stack_index = INVALID_TPD_INDEX;
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49
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50 /*
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51 * call_once
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52 *
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53 * The thread-private index must be obtained (once!) at runtime.
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54 * This block is used for that one-time call.
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55 */
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56
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57 static PRCallOnceType error_call_once;
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58
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59 /*
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60 * error_once_function
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61 *
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62 * This is the once-called callback.
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63 */
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64 static PRStatus
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65 error_once_function ( void)
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66 {
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67 return PR_NewThreadPrivateIndex(&error_stack_index, PR_Free);
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68 }
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69
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70 /*
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71 * error_get_my_stack
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72 *
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73 * This routine returns the calling thread's error stack, creating
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74 * it if necessary. It may return NULL upon error, which implicitly
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75 * means that it ran out of memory.
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76 */
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77
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78 static error_stack *
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79 error_get_my_stack ( void)
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80 {
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81 PRStatus st;
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82 error_stack *rv;
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83 PRUintn new_size;
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84 PRUint32 new_bytes;
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85 error_stack *new_stack;
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86
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87 if( INVALID_TPD_INDEX == error_stack_index ) {
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88 st = PR_CallOnce(&error_call_once, error_once_function);
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89 if( PR_SUCCESS != st ) {
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90 return (error_stack *)NULL;
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91 }
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92 }
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93
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94 rv = (error_stack *)PR_GetThreadPrivate(error_stack_index);
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95 if( (error_stack *)NULL == rv ) {
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96 /* Doesn't exist; create one */
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97 new_size = 16;
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98 } else if( rv->header.count == rv->header.space &&
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99 rv->header.count < NSS_MAX_ERROR_STACK_COUNT ) {
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100 /* Too small, expand it */
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101 new_size = PR_MIN( rv->header.space * 2, NSS_MAX_ERROR_STACK_COUNT);
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102 } else {
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103 /* Okay, return it */
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104 return rv;
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105 }
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106
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107 new_bytes = (new_size * sizeof(PRInt32)) + sizeof(error_stack);
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108 /* Use NSPR's calloc/realloc, not NSS's, to avoid loops! */
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109 new_stack = PR_Calloc(1, new_bytes);
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110
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111 if( (error_stack *)NULL != new_stack ) {
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112 if( (error_stack *)NULL != rv ) {
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113 (void)nsslibc_memcpy(new_stack,rv,rv->header.space);
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114 }
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115 new_stack->header.space = new_size;
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116 }
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117
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118 /* Set the value, whether or not the allocation worked */
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119 PR_SetThreadPrivate(error_stack_index, new_stack);
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120 return new_stack;
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121 }
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122
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123 /*
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124 * The error stack
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125 *
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126 * The public methods relating to the error stack are:
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127 *
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128 * NSS_GetError
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129 * NSS_GetErrorStack
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130 *
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131 * The nonpublic methods relating to the error stack are:
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132 *
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133 * nss_SetError
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134 * nss_ClearErrorStack
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135 *
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136 */
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137
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138 /*
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139 * NSS_GetError
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140 *
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141 * This routine returns the highest-level (most general) error set
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142 * by the most recent NSS library routine called by the same thread
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143 * calling this routine.
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144 *
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145 * This routine cannot fail. However, it may return zero, which
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146 * indicates that the previous NSS library call did not set an error.
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147 *
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148 * Return value:
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149 * 0 if no error has been set
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150 * A nonzero error number
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151 */
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152
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153 NSS_IMPLEMENT PRInt32
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154 NSS_GetError ( void)
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155 {
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156 error_stack *es = error_get_my_stack();
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157
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158 if( (error_stack *)NULL == es ) {
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159 return NSS_ERROR_NO_MEMORY; /* Good guess! */
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160 }
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161
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162 if( 0 == es->header.count ) {
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163 return 0;
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164 }
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165
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166 return es->stack[ es->header.count-1 ];
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167 }
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168
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169 /*
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170 * NSS_GetErrorStack
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171 *
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172 * This routine returns a pointer to an array of integers, containing
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173 * the entire sequence or "stack" of errors set by the most recent NSS
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174 * library routine called by the same thread calling this routine.
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175 * NOTE: the caller DOES NOT OWN the memory pointed to by the return
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176 * value. The pointer will remain valid until the calling thread
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177 * calls another NSS routine. The lowest-level (most specific) error
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178 * is first in the array, and the highest-level is last. The array is
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179 * zero-terminated. This routine may return NULL upon error; this
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180 * indicates a low-memory situation.
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181 *
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182 * Return value:
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183 * NULL upon error, which is an implied NSS_ERROR_NO_MEMORY
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184 * A NON-caller-owned pointer to an array of integers
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185 */
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186
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187 NSS_IMPLEMENT PRInt32 *
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188 NSS_GetErrorStack ( void)
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189 {
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190 error_stack *es = error_get_my_stack();
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191
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192 if( (error_stack *)NULL == es ) {
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193 return (PRInt32 *)NULL;
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194 }
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195
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196 /* Make sure it's terminated */
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197 es->stack[ es->header.count ] = 0;
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198
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199 return es->stack;
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200 }
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201
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202 /*
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203 * nss_SetError
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204 *
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205 * This routine places a new error code on the top of the calling
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206 * thread's error stack. Calling this routine wiht an error code
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207 * of zero will clear the error stack.
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208 */
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209
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210 NSS_IMPLEMENT void
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211 nss_SetError ( PRUint32 error)
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212 {
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213 error_stack *es;
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214
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215 if( 0 == error ) {
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216 nss_ClearErrorStack();
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217 return;
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218 }
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219
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220 es = error_get_my_stack();
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221 if( (error_stack *)NULL == es ) {
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222 /* Oh, well. */
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223 return;
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224 }
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225
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226 if (es->header.count < es->header.space) {
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227 es->stack[ es->header.count++ ] = error;
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228 } else {
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229 memmove(es->stack, es->stack + 1,
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230 (es->header.space - 1) * (sizeof es->stack[0]));
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231 es->stack[ es->header.space - 1 ] = error;
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232 }
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233 return;
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234 }
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235
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236 /*
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237 * nss_ClearErrorStack
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238 *
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239 * This routine clears the calling thread's error stack.
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240 */
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241
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242 NSS_IMPLEMENT void
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243 nss_ClearErrorStack ( void)
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244 {
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245 error_stack *es = error_get_my_stack();
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246 if( (error_stack *)NULL == es ) {
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247 /* Oh, well. */
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248 return;
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249 }
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250
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251 es->header.count = 0;
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252 es->stack[0] = 0;
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253 return;
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254 }
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255
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256 /*
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257 * nss_DestroyErrorStack
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258 *
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259 * This routine frees the calling thread's error stack.
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260 */
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261
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262 NSS_IMPLEMENT void
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263 nss_DestroyErrorStack ( void)
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parents:
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264 {
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265 if( INVALID_TPD_INDEX != error_stack_index ) {
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266 PR_SetThreadPrivate(error_stack_index, NULL);
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267 }
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268 return;
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269 }
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