--- /dev/null
+/*
+ * 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;
+
+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;
+}
+
+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_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;
+}
+
+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;
+}
+
+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\n", e->what);
+ }
+
+ return s;
+}
+
+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
Code Review / vpp.git / blobdiff