hi all, In Stevens' UNIX Network Programming Vol 2 Second Edition, it says "Most implementations define the six constants MSG_R, MSG_W, ..... But these are not required by Unix 98." on page 33. it seems to me that linux 2.2.x + glibc 2.1.1pre1 doesn't have those value difined in any of header files. should i just use numeric values or am i missing something? -- yashi