mirror of
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63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "sandboxed_api/sandbox2/util/strerror.h"
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#include <string.h> // For strerror_r
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#include <cerrno>
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#include <cstddef>
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#include "absl/base/attributes.h"
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#include "absl/strings/str_cat.h"
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namespace sandbox2 {
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namespace {
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// Only one of these overloads will be used in any given build, as determined by
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// the return type of strerror_r(): char* (for GNU), or int (for XSI). See 'man
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// strerror_r' for more details.
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ABSL_ATTRIBUTE_UNUSED const char* StrErrorR(char* (*strerror_r)(int, char*,
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size_t),
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int errnum, char* buf,
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size_t buflen) {
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return strerror_r(errnum, buf, buflen);
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}
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// The XSI version (most portable).
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ABSL_ATTRIBUTE_UNUSED const char* StrErrorR(int (*strerror_r)(int, char*,
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size_t),
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int errnum, char* buf,
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size_t buflen) {
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if (strerror_r(errnum, buf, buflen)) {
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*buf = '\0';
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}
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return buf;
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}
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} // namespace
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std::string StrError(int errnum) {
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const int saved_errno = errno;
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char buf[100];
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const char* str = StrErrorR(strerror_r, errnum, buf, sizeof(buf));
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if (*str == '\0') {
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return absl::StrCat("Unknown error ", errnum);
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}
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errno = saved_errno;
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return str;
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}
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} // namespace sandbox2
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