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fc9b22c883
This gives us a logging macro that's safe to use in async signal context (cf. bug 1046210, where we needed this and didn't have it). This patch also changes one of the format strings to work with SafeSPrintf's format string dialect; upstream would probably take a patch to handle those letters, but this is easier.
53 lines
2.1 KiB
C++
53 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_SandboxLogging_h
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#define mozilla_SandboxLogging_h
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// This header defines the SANDBOX_LOG_ERROR macro used in the Linux
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// sandboxing code. It uses Android logging on Android and writes to
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// stderr otherwise. Android logging has severity levels; currently
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// only "error" severity is exposed here, and this isn't marked when
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// writing to stderr.
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//
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// The format strings are processed by Chromium SafeSPrintf, which
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// doesn't accept size modifiers or %u because it uses C++11 variadic
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// templates to obtain the actual argument types; all decimal integer
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// formatting uses %d. See safe_sprintf.h for more details.
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// Build SafeSPrintf without assertions to avoid a dependency on
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// Chromium logging. This doesn't affect safety; it just means that
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// type mismatches (pointer vs. integer) always result in unexpanded
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// %-directives instead of crashing. See also the moz.build files,
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// which apply NDEBUG to the .cc file.
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#ifndef NDEBUG
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#define NDEBUG 1
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#include "base/strings/safe_sprintf.h"
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#undef NDEBUG
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#else
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#include "base/strings/safe_sprintf.h"
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#endif
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namespace mozilla {
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// Logs the formatted string (marked with "error" severity, if supported).
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void SandboxLogError(const char* aMessage);
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}
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#define SANDBOX_LOG_LEN 256
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// Formats a log message and logs it (with "error" severity, if supported).
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//
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// Note that SafeSPrintf doesn't accept size modifiers or %u; all
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// decimal integers are %d, because it uses C++11 variadic templates
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// to use the actual argument type.
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#define SANDBOX_LOG_ERROR(fmt, args...) do { \
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char _sandboxLogBuf[SANDBOX_LOG_LEN]; \
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::base::strings::SafeSPrintf(_sandboxLogBuf, fmt, ## args); \
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::mozilla::SandboxLogError(_sandboxLogBuf); \
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} while(0)
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#endif // mozilla_SandboxLogging_h
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