Index: base/safe_strerror_posix.cc |
diff --git a/base/safe_strerror_posix.cc b/base/safe_strerror_posix.cc |
deleted file mode 100644 |
index 9da7aeef1190bd22aca5f203afd90bc5d9639cd3..0000000000000000000000000000000000000000 |
--- a/base/safe_strerror_posix.cc |
+++ /dev/null |
@@ -1,119 +0,0 @@ |
-// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved. |
-// Use of this source code is governed by a BSD-style license that can be |
-// found in the LICENSE file. |
- |
-#if defined(__ANDROID__) |
-// Post-L versions of bionic define the GNU-specific strerror_r if _GNU_SOURCE |
-// is defined, but the symbol is renamed to __gnu_strerror_r which only exists |
-// on those later versions. To preserve ABI compatibility with older versions, |
-// undefine _GNU_SOURCE and use the POSIX version. |
-#undef _GNU_SOURCE |
-#endif |
- |
-#include "build/build_config.h" |
-#include "base/safe_strerror_posix.h" |
- |
-#include <errno.h> |
-#include <stdio.h> |
-#include <string.h> |
- |
-#define USE_HISTORICAL_STRERRO_R (defined(__GLIBC__) || defined(OS_NACL)) |
- |
-#if USE_HISTORICAL_STRERRO_R && defined(__GNUC__) |
-// GCC will complain about the unused second wrap function unless we tell it |
-// that we meant for them to be potentially unused, which is exactly what this |
-// attribute is for. |
-#define POSSIBLY_UNUSED __attribute__((unused)) |
-#else |
-#define POSSIBLY_UNUSED |
-#endif |
- |
-#if USE_HISTORICAL_STRERRO_R |
-// glibc has two strerror_r functions: a historical GNU-specific one that |
-// returns type char *, and a POSIX.1-2001 compliant one available since 2.3.4 |
-// that returns int. This wraps the GNU-specific one. |
-static void POSSIBLY_UNUSED wrap_posix_strerror_r( |
- char *(*strerror_r_ptr)(int, char *, size_t), |
- int err, |
- char *buf, |
- size_t len) { |
- // GNU version. |
- char *rc = (*strerror_r_ptr)(err, buf, len); |
- if (rc != buf) { |
- // glibc did not use buf and returned a static string instead. Copy it |
- // into buf. |
- buf[0] = '\0'; |
- strncat(buf, rc, len - 1); |
- } |
- // The GNU version never fails. Unknown errors get an "unknown error" message. |
- // The result is always null terminated. |
-} |
-#endif // USE_HISTORICAL_STRERRO_R |
- |
-// Wrapper for strerror_r functions that implement the POSIX interface. POSIX |
-// does not define the behaviour for some of the edge cases, so we wrap it to |
-// guarantee that they are handled. This is compiled on all POSIX platforms, but |
-// it will only be used on Linux if the POSIX strerror_r implementation is |
-// being used (see below). |
-static void POSSIBLY_UNUSED wrap_posix_strerror_r( |
- int (*strerror_r_ptr)(int, char *, size_t), |
- int err, |
- char *buf, |
- size_t len) { |
- int old_errno = errno; |
- // Have to cast since otherwise we get an error if this is the GNU version |
- // (but in such a scenario this function is never called). Sadly we can't use |
- // C++-style casts because the appropriate one is reinterpret_cast but it's |
- // considered illegal to reinterpret_cast a type to itself, so we get an |
- // error in the opposite case. |
- int result = (*strerror_r_ptr)(err, buf, len); |
- if (result == 0) { |
- // POSIX is vague about whether the string will be terminated, although |
- // it indirectly implies that typically ERANGE will be returned, instead |
- // of truncating the string. We play it safe by always terminating the |
- // string explicitly. |
- buf[len - 1] = '\0'; |
- } else { |
- // Error. POSIX is vague about whether the return value is itself a system |
- // error code or something else. On Linux currently it is -1 and errno is |
- // set. On BSD-derived systems it is a system error and errno is unchanged. |
- // We try and detect which case it is so as to put as much useful info as |
- // we can into our message. |
- int strerror_error; // The error encountered in strerror |
- int new_errno = errno; |
- if (new_errno != old_errno) { |
- // errno was changed, so probably the return value is just -1 or something |
- // else that doesn't provide any info, and errno is the error. |
- strerror_error = new_errno; |
- } else { |
- // Either the error from strerror_r was the same as the previous value, or |
- // errno wasn't used. Assume the latter. |
- strerror_error = result; |
- } |
- // snprintf truncates and always null-terminates. |
- snprintf(buf, |
- len, |
- "Error %d while retrieving error %d", |
- strerror_error, |
- err); |
- } |
- errno = old_errno; |
-} |
- |
-void safe_strerror_r(int err, char *buf, size_t len) { |
- if (buf == NULL || len <= 0) { |
- return; |
- } |
- // If using glibc (i.e., Linux), the compiler will automatically select the |
- // appropriate overloaded function based on the function type of strerror_r. |
- // The other one will be elided from the translation unit since both are |
- // static. |
- wrap_posix_strerror_r(&strerror_r, err, buf, len); |
-} |
- |
-std::string safe_strerror(int err) { |
- const int buffer_size = 256; |
- char buf[buffer_size]; |
- safe_strerror_r(err, buf, sizeof(buf)); |
- return std::string(buf); |
-} |