A few small macros used to simplify error handling in C++ code that uses POSIX and UNIX system calls. Depends on an exception class UNIXError, which just happens to have an argument-less constructor that will get an error string based on the current value

cpp-posix-errors.cpp

#define ERR(__statment, __retVar)  ((__retVar=(__statment))==-1 ? throw UNIXError() :  (__retVar))
#define ERR_ERRVAL(__statment, __retVar, __errval)  (((__retVar)=(__statment))==(__errval) ? throw UNIXError() :  (__retVar))