| // Copyright 2008 Google Inc. All Rights Reserved. |
| // |
| // Various Google-specific macros. |
| // |
| // This code is compiled directly on many platforms, including client |
| // platforms like Windows, Mac, and embedded systems. Before making |
| // any changes here, make sure that you're not breaking any platforms. |
| // |
| |
| #pragma once |
| |
| #include <stddef.h> // For size_t |
| |
| #include "butil/macros.h" |
| #include "gutil/port.h" |
| |
| // Macro that allows definition of a variable appended with the current line |
| // number in the source file. Typically for use by other macros to allow the |
| // user to declare multiple variables with the same "base" name inside the same |
| // lexical block. |
| #define VARNAME_LINENUM(varname) VARNAME_LINENUM_INTERNAL(varname##_L, __LINE__) |
| #define VARNAME_LINENUM_INTERNAL(v, line) VARNAME_LINENUM_INTERNAL2(v, line) |
| #define VARNAME_LINENUM_INTERNAL2(v, line) v##line |
| |
| // Retry on EINTR for functions like read() that return -1 on error. |
| #define RETRY_ON_EINTR(err, expr) \ |
| do { \ |
| static_assert(std::is_signed<decltype(err)>::value, #err " must be a signed integer"); \ |
| (err) = (expr); \ |
| } while ((err) == -1 && errno == EINTR) |
