summaryrefslogtreecommitdiffstats
path: root/src/vppinfra/error.c
blob: b2b1a83e5526771e469f26e66f2314b7e2adbfa9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
  Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

/* Error reporting. */
#include <stdarg.h>

#include <vppinfra/clib.h>	/* for HAVE_ERRNO */

#ifdef CLIB_LINUX_KERNEL
#include <linux/unistd.h>	/* for write */
#include <linux/kernel.h>	/* for printk */
#endif

#ifdef CLIB_UNIX
#include <unistd.h>		/* for write */
#include <stdio.h>		/* for printf */
#define HAVE_ERRNO
#endif

#ifdef CLIB_STANDALONE
#include <vppinfra/standalone_stdio.h>	/* for printf */
#endif

#include <vppinfra/string.h>
#include <vppinfra/mem.h>
#include <vppinfra/vec.h>
#include <vppinfra/format.h>
#include <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vppinfra/os.h>	/* for os_panic/os_exit/os_puts */

typedef struct
{
  clib_error_handler_func_t *func;
  void *arg;
} clib_error_handler_t;

static clib_error_handler_t *handlers = 0;

__clib_export void
clib_error_register_handler (clib_error_handler_func_t func, void *arg)
{
  clib_error_handler_t h = {.func = func,.arg = arg, };
  vec_add1 (handlers, h);
}

static void
debugger (void)
{
  os_panic ();
}

static void
error_exit (int code)
{
  os_exit (code);
}

static u8 *
dispatch_message (u8 * msg)
{
  word i;

  if (!msg)
    return msg;

  for (i = 0; i < vec_len (handlers); i++)
    handlers[i].func (handlers[i].arg, msg, vec_len (msg));

  /* If no message handler is specified provide a default one. */
  if (vec_len (handlers) == 0)
    os_puts (msg, vec_len (msg), /* is_error */ 1);

  return msg;
}

__clib_export void
_clib_error (int how_to_die,
	     char *function_name, uword line_number, char *fmt, ...)
{
  u8 *msg = 0;
  va_list va;

  if (function_name)
    {
      msg = format (msg, "%s:", function_name);
      if (line_number > 0)
	msg = format (msg, "%wd:", line_number);
      msg = format (msg, " ");
    }

  va_start (va, fmt);
  msg = va_format (msg, fmt, &va);
  va_end (va);

#ifdef HAVE_ERRNO
  if (how_to_die & CLIB_ERROR_ERRNO_VALID)
    msg = format (msg, ": %s (errno %d)", strerror (errno), errno);
#endif

  if (vec_end (msg)[-1] != '\n')
    vec_add1 (msg, '\n');

  msg = dispatch_message (msg);

  vec_free (msg);

  if (how_to_die & CLIB_ERROR_ABORT)
    debugger ();
  if (how_to_die & CLIB_ERROR_FATAL)
    error_exit (1);
}

__clib_export clib_error_t *
_clib_error_return (clib_error_t * errors,
		    any code, uword flags, char *where, char *fmt, ...)
{
  clib_error_t *e;
  va_list va;

#ifdef HAVE_ERRNO
  /* Save errno since it may be re-set before we'll need it. */
  word errno_save = errno;
#endif

  va_start (va, fmt);
  vec_add2 (errors, e, 1);
  if (fmt)
    e->what = va_format (0, fmt, &va);

#ifdef HAVE_ERRNO
  if (flags & CLIB_ERROR_ERRNO_VALID)
    {
      if (e->what)
	e->what = format (e->what, ": ");
      e->what = format (e->what, "%s", strerror (errno_save));
    }
#endif

  e->where = (u8 *) where;
  e->code = code;
  e->flags = flags;
  va_end (va);
  return errors;
}

__clib_export void *
clib_error_free_vector (clib_error_t * errors)
{
  clib_error_t *e;
  vec_foreach (e, errors) vec_free (e->what);
  vec_free (errors);
  return 0;
}

__clib_export u8 *
format_clib_error (u8 * s, va_list * va)
{
  clib_error_t *errors = va_arg (*va, clib_error_t *);
  clib_error_t *e;

  vec_foreach (e, errors)
  {
    if (!e->what)
      continue;

    if (e->where)
      {
	u8 *where = 0;

	if (e > errors)
	  where = format (where, "from ");
	where = format (where, "%s", e->where);

	s = format (s, "%v: ", where);
	vec_free (where);
      }

    s = format (s, "%v", e->what);
    if ((vec_end (errors) - 1) != e)
      s = format (s, "\n");
  }

  return s;
}

__clib_export clib_error_t *
_clib_error_report (clib_error_t * errors)
{
  if (errors)
    {
      u8 *msg = format (0, "%U", format_clib_error, errors);

      msg = dispatch_message (msg);
      vec_free (msg);

      if (errors->flags & CLIB_ERROR_ABORT)
	debugger ();
      if (errors->flags & CLIB_ERROR_FATAL)
	error_exit (1);

      clib_error_free (errors);
    }
  return 0;
}

#ifdef TEST

static error_t *
foo1 (int x)
{
  return error_return (0, "x is odd %d", x);
}

static error_t *
foo2 (int x)
{
  return error_return (0, "x is even %d", x);
}

static error_t *
foo (int x)
{
  error_t *e;
  if (x & 1)
    e = foo1 (x);
  else
    e = foo2 (x);
  if (e)
    return error_return (e, 0);
}

static void
error_handler (void *arg, char *msg, int msg_len)
{
  write (2, msg, msg_len);
}

int
main (int argc, char *argv[])
{
  error_t *e;

  register_error_handler (error_handler, 0);

  e = foo (getpid ());
  if (e)
    error_report (e);
  return 0;
}

#endif

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */