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详细说明： Posix多线程程序设计书中实例源码。 头文件errors.h #ifndef __errors_h #define __errors_h #include #include #include #include #include /* * Define a macro that can be used for diagnostic output from * examples. When compiled -DDEBUG, it results in calling printf * with the specified argument list. When DEBUG is not defined, it * expands to nothing. */ #ifdef DEBUG # define DPRINTF(arg) printf arg #else # define DPRINTF(arg) #endif /* * NOTE: the "do {&q uot; ... "} while (0);" bracketing around the macros * allows the err_abort and errno_abort macros to be used as if they * were function calls, even in contexts where a trailing ";" would * generate a null statement. For example, * * if (status != 0) * err_abort (status, "message"); * else * return status; * * will not compile if err_abort is a macro ending with "}", because * C does not expect a ";" to follow the "}". Because C does expect * a ";" following the ")" in the do...while construct, err_abort and * errno_abort can be used as if they were function calls. */ #define err_abort(code,text) do { \ fprintf (stderr, "%s at \"%s\":%d: %s\n", \ text, __FILE__, __LINE__, strerror (code)); \ abort (); \ } while (0) #define errno_abort(text) do { \ fprintf (stderr, "%s at \"%s\":%d: %s\n", \ text, __FILE__, __LINE__, strerror (errno)); \ abort (); \ } while (0) #endif ...展开收缩
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