source: releases/0.99.0/python/experimental/regfi/error.c

Last change on this file was 198, checked in by tim, 14 years ago

misc tweaks to run under python2.5-dbg

File size: 1.8 KB
Line 
1/*
2** error.c
3**
4** Made by (mic)
5** Login   <mic@laptop>
6**
7** Started on  Mon Mar 15 20:45:09 2010 mic
8** Last update Sun May 12 01:17:25 2002 Speed Blue
9*/
10
11#include <pthread.h>
12#include <stdio.h>
13#include <stdlib.h>
14#include <stdarg.h>
15#include <talloc.h>
16#include "aff4_errors.h"
17
18/** These slots carry the TLS error keys */
19static pthread_key_t error_str_slot;
20static pthread_key_t error_value_slot;
21
22void error_dest(void *slot) {
23  if(slot) talloc_free(slot);
24}
25
26void *raise_errors(enum _error_type t, char *reason, ...) {
27  char *error_buffer;
28  // This has to succeed:
29  enum _error_type *type = aff4_get_current_error(&error_buffer);
30
31  if(reason) {
32    va_list ap;
33    va_start(ap, reason);
34
35    vsnprintf(error_buffer, ERROR_BUFFER_SIZE-1, reason,ap);
36    error_buffer[ERROR_BUFFER_SIZE-1]=0;
37    va_end(ap);
38  };
39
40  //update the error type
41  *type = t;
42
43  return NULL;
44}
45
46static int error_subsystem_initialised=0;
47
48enum _error_type *aff4_get_current_error(char **error_buffer) {
49  enum _error_type *type;
50
51  if(!error_subsystem_initialised) error_init();
52
53  type = pthread_getspecific(error_value_slot);
54
55  // This is optional
56  if(error_buffer) {
57    *error_buffer = pthread_getspecific(error_str_slot);
58
59  // If TLS buffers are not set we need to create them
60    if(!*error_buffer) {
61      *error_buffer =talloc_size(NULL, ERROR_BUFFER_SIZE);
62      pthread_setspecific(error_str_slot, *error_buffer);
63    };
64  };
65
66  if(!type) {
67    type = talloc(NULL, enum _error_type);
68    pthread_setspecific(error_value_slot, type);
69  };
70
71  return type;
72}
73
74/** Initialise the error subsystem */
75void error_init() {
76  error_subsystem_initialised = 1;
77
78  // We create the error buffer slots
79  if(pthread_key_create(&error_str_slot, error_dest) ||
80     pthread_key_create(&error_value_slot, error_dest)) {
81    printf("Unable to set up TLS variables\n");
82    abort();
83  };
84}
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