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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/common/error.h>
#include <aws/common/common.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
static AWS_THREAD_LOCAL int tl_last_error = 0;
static aws_error_handler_fn *s_global_handler = NULL;
static void *s_global_error_context = NULL;
static AWS_THREAD_LOCAL aws_error_handler_fn *tl_thread_handler = NULL;
AWS_THREAD_LOCAL void *tl_thread_handler_context = NULL;
/* Since slot size is 00000100 00000000, to divide, we need to shift right by 10
* bits to find the slot, and to find the modulus, we use a binary and with
* 00000011 11111111 to find the index in that slot.
*/
#define SLOT_MASK (AWS_ERROR_ENUM_STRIDE - 1)
static const int MAX_ERROR_CODE = AWS_ERROR_ENUM_STRIDE * AWS_PACKAGE_SLOTS;
static const struct aws_error_info_list *volatile ERROR_SLOTS[AWS_PACKAGE_SLOTS] = {0};
int aws_last_error(void) {
return tl_last_error;
}
static const struct aws_error_info *get_error_by_code(int err) {
if (err >= MAX_ERROR_CODE || err < 0) {
return NULL;
}
uint32_t slot_index = (uint32_t)err >> AWS_ERROR_ENUM_STRIDE_BITS;
uint32_t error_index = (uint32_t)err & SLOT_MASK;
const struct aws_error_info_list *error_slot = ERROR_SLOTS[slot_index];
if (!error_slot || error_index >= error_slot->count) {
return NULL;
}
return &error_slot->error_list[error_index];
}
const char *aws_error_str(int err) {
const struct aws_error_info *error_info = get_error_by_code(err);
if (error_info) {
return error_info->error_str;
}
return "Unknown Error Code";
}
const char *aws_error_name(int err) {
const struct aws_error_info *error_info = get_error_by_code(err);
if (error_info) {
return error_info->literal_name;
}
return "Unknown Error Code";
}
const char *aws_error_lib_name(int err) {
const struct aws_error_info *error_info = get_error_by_code(err);
if (error_info) {
return error_info->lib_name;
}
return "Unknown Error Code";
}
const char *aws_error_debug_str(int err) {
const struct aws_error_info *error_info = get_error_by_code(err);
if (error_info) {
return error_info->formatted_name;
}
return "Unknown Error Code";
}
void aws_raise_error_private(int err) {
tl_last_error = err;
if (tl_thread_handler) {
tl_thread_handler(tl_last_error, tl_thread_handler_context);
} else if (s_global_handler) {
s_global_handler(tl_last_error, s_global_error_context);
}
}
void aws_reset_error(void) {
tl_last_error = 0;
}
void aws_restore_error(int err) {
tl_last_error = err;
}
aws_error_handler_fn *aws_set_global_error_handler_fn(aws_error_handler_fn *handler, void *ctx) {
aws_error_handler_fn *old_handler = s_global_handler;
s_global_handler = handler;
s_global_error_context = ctx;
return old_handler;
}
aws_error_handler_fn *aws_set_thread_local_error_handler_fn(aws_error_handler_fn *handler, void *ctx) {
aws_error_handler_fn *old_handler = tl_thread_handler;
tl_thread_handler = handler;
tl_thread_handler_context = ctx;
return old_handler;
}
void aws_register_error_info(const struct aws_error_info_list *error_info) {
/*
* We're not so worried about these asserts being removed in an NDEBUG build
* - we'll either segfault immediately (for the first two) or for the count
* assert, the registration will be ineffective.
*/
AWS_FATAL_ASSERT(error_info);
AWS_FATAL_ASSERT(error_info->error_list);
AWS_FATAL_ASSERT(error_info->count);
const int min_range = error_info->error_list[0].error_code;
const int slot_index = min_range >> AWS_ERROR_ENUM_STRIDE_BITS;
if (slot_index >= AWS_PACKAGE_SLOTS || slot_index < 0) {
/* This is an NDEBUG build apparently. Kill the process rather than
* corrupting heap. */
fprintf(stderr, "Bad error slot index %d\n", slot_index);
AWS_FATAL_ASSERT(false);
}
#if DEBUG_BUILD
/* Assert that error info entries are in the right order. */
for (int i = 1; i < error_info->count; ++i) {
const int expected_code = min_range + i;
const struct aws_error_info *info = &error_info->error_list[i];
if (info->error_code != expected_code) {
if (info->error_code) {
fprintf(stderr, "Error %s is at wrong index of error info list.\n", info->literal_name);
} else {
fprintf(stderr, "Error %d is missing from error info list.\n", expected_code);
}
AWS_FATAL_ASSERT(0);
}
}
#endif /* DEBUG_BUILD */
ERROR_SLOTS[slot_index] = error_info;
}
void aws_unregister_error_info(const struct aws_error_info_list *error_info) {
AWS_FATAL_ASSERT(error_info);
AWS_FATAL_ASSERT(error_info->error_list);
AWS_FATAL_ASSERT(error_info->count);
const int min_range = error_info->error_list[0].error_code;
const int slot_index = min_range >> AWS_ERROR_ENUM_STRIDE_BITS;
if (slot_index >= AWS_PACKAGE_SLOTS || slot_index < 0) {
/* This is an NDEBUG build apparently. Kill the process rather than
* corrupting heap. */
fprintf(stderr, "Bad error slot index %d\n", slot_index);
AWS_FATAL_ASSERT(0);
}
ERROR_SLOTS[slot_index] = NULL;
}
int aws_translate_and_raise_io_error(int error_no) {
switch (error_no) {
case EINVAL:
return aws_raise_error(AWS_ERROR_INVALID_ARGUMENT);
case ESPIPE:
return aws_raise_error(AWS_ERROR_STREAM_UNSEEKABLE);
case EPERM:
case EACCES:
return aws_raise_error(AWS_ERROR_NO_PERMISSION);
case EISDIR:
case ENAMETOOLONG:
case ENOENT:
return aws_raise_error(AWS_ERROR_FILE_INVALID_PATH);
case ENFILE:
return aws_raise_error(AWS_ERROR_MAX_FDS_EXCEEDED);
case ENOMEM:
return aws_raise_error(AWS_ERROR_OOM);
case ENOSPC:
return aws_raise_error(AWS_ERROR_NO_SPACE);
default:
return aws_raise_error(AWS_ERROR_SYS_CALL_FAILURE);
}
}
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