C语言内存错误检测工具：memwatch
MEMWATCH 由 Johan Lindh 编写，是一个开放源代码 C 语言内存错误检测工具。只要在代码中添加一个头文件并在 gcc 语句中定义了 MEMWATCH 之后，您就可以跟踪程序中的内存泄漏和错误了。MEMWATCH 支持 ANSI C，它提供结果日志记录，能检测双重释放（double-free）、错误释放（erroneous free）、没有释放的内存（unfreed memory）、溢出和下溢等等。
特性：
- ANSI C
- Logging to file or user function using TRACE() macro
- Fault tolerant, can repair it’s own data structures
- Detects double-frees and erroneous free’s
- Detects unfreed memory
- Detects overflow and underflow to memory buffers
- Can set maximum allowed memory to allocate, to stress-test app
- ASSERT(expr) and VERIFY(expr) macros
- Can detect wild pointer writes
- Support for OS specific address validation to avoid GP’s (segmentation faults)
- Collects allocation statistics on application, module or line level
- Rudimentary support for threads (see FAQ for details)
- Rudimentary support for C++ (disabled by default, use with care!)