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Annotation of coherent/a/usr/man/ALL/buffer, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: buffer                      Definition                     buffer
        !             4: 
        !             5: 
        !             6: 
        !             7: 
        !             8: A buffer is a portion of  memory set aside to hold data read from
        !             9: or to  be written to another process  or device.  Often, although
        !            10: not always,  this involves setting  aside a portion  of the arena
        !            11: with malloc or its related functions.
        !            12: 
        !            13: Buffering,  and problems  therewith, are  encountered  most often
        !            14: when using the  standard input and output (STDIO) routines.  Many
        !            15: operating systems  (including COHERENT) automatically  place data
        !            16: from a peripheral device  into a buffer.  Buffers normally can be
        !            17: cleared  with fflush,  by  pressing the  carriage  return key  on
        !            18: routines that perform input, or by sending a newline character on
        !            19: routines that perform  output.  The function fclose, which closes
        !            20: a file  stream, flushes all buffers  associated with that stream.
        !            21: exit calls fclose.
        !            22: 
        !            23: Combining unbuffered and  buffered I/O functions on the same file
        !            24: or device  within one  program will  produce results that  are at
        !            25: best unpredictable.
        !            26: 
        !            27: ***** Example *****
        !            28: 
        !            29: The following example  demonstrates what does and does not happen
        !            30: when you use fffflluusshh with the output buffer.
        !            31: 
        !            32: 
        !            33: #include <stdio.h>
        !            34: main()
        !            35: {
        !            36:         extern char *malloc();
        !            37:         char *buffer;
        !            38: 
        !            39: 
        !            40: 
        !            41:         /* use malloc() to create a 120-char buffer */
        !            42:         if ((buffer = malloc(120)) == NULL) {
        !            43:                 /* if malloc() fails, bail out */
        !            44:                 fprintf(stderr, "malloc failed\n");
        !            45:                 exit(1);
        !            46:         }
        !            47: 
        !            48: 
        !            49: 
        !            50:         printf("Type your name:  ");
        !            51:         fflush(stdout);
        !            52:         gets(buffer);
        !            53:         printf("Your name is %s\n", buffer);
        !            54: }
        !            55: 
        !            56: 
        !            57: ***** See Also *****
        !            58: 
        !            59: arena, array, close, definitions, exit, fflush, malloc, STDIO
        !            60: 
        !            61: 
        !            62: 
        !            63: 
        !            64: COHERENT Lexicon                                           Page 1
        !            65: 
        !            66: 

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