Unbuffered Stdio Input

[Michael Meissner]

In article <378 at node17.mecazh.UUCP> paul at mecazh.UUCP (Paul Breslaw) writes:

| I have a little program that opens a master side pty and reads from it.
| I have another little program that opens the corresponding slave side
| and writes to it.
| 
| If the master side is coded something like:-
| 
|     FILE *f;
|     char buf[ BF ];
|     int  nr;
| 
|     f = fopen( master, "a+" );
|     nr = fread( buf, sizeof( char ), BF, f );
| 
| then the program hangs on the fread.

Fread will loop attempting to fill the entire buffer.  If your records
are line oriented, I would recomend using fgets.  If you need to get
the characters as soon as possible, I would recomend switching the pty
to CBREAK or RAW modes, and using getc() to read bytes as you need
them.
--
Michael Meissner	email: meissner at osf.org		phone: 617-621-8861
Open Software Foundation, 11 Cambridge Center, Cambridge, MA

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