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06-02-2005
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How to get fdes from FILE*
The open() system call directly returns a fdes, whereas it's more portable 'ANSI C' counterpart fopen() returns a pointer the the FILE struct.
I have seen implementation of stdio.h on HP-UX, BSD and a few more, the typedef'd struct FILE stores the value of file descriptor in differenrt ways with diff attribute names. In such a case how do i portably extract the file descriptor from a pointer to the FILE struct as returned by fopen? Is there any such macro in C? Even as i am concerned about portability I also need to excercise the power and granularity provided by system calls  F1, F1, F1 ...... Thanks in Advance, Sumanth |
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