mdw@git.distorted.org.uk Git - mLib/blob - selbuf.h

   1 /* -*-c-*-
   2  *
   3  * $Id: selbuf.h,v 1.4 2002/01/13 13:33:15 mdw Exp $
   4  *
   5  * Line-buffering select handler
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of the mLib utilities library.
  13  *
  14  * mLib is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * mLib is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with mLib; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: selbuf.h,v $
  33  * Revision 1.4  2002/01/13 13:33:15  mdw
  34  * Track interface change for @lbuf@.
  35  *
  36  * Revision 1.3  2000/06/17 10:38:14  mdw
  37  * Add support for variable buffer sizes.
  38  *
  39  * Revision 1.2  1999/12/10 23:42:04  mdw
  40  * Change header file guard names.
  41  *
  42  * Revision 1.1  1999/05/14 21:01:15  mdw
  43  * Integrated `select' handling bits from the background resolver project.
  44  *
  45  */
  46
  47 #ifndef MLIB_SELBUF_H
  48 #define MLIB_SELBUF_H
  49
  50 #ifdef __cplusplus
  51   extern "C" {
  52 #endif
  53
  54 /*----- Header files ------------------------------------------------------*/
  55
  56 #ifndef MLIB_LBUF_H
  57 #  include "lbuf.h"
  58 #endif
  59
  60 #ifndef MLIB_SEL_H
  61 #  include "sel.h"
  62 #endif
  63
  64 /*----- Data structures ---------------------------------------------------*/
  65
  66 typedef struct selbuf {
  67   sel_file reader;                      /* File selection object */
  68   lbuf b;                               /* Line buffering object */
  69 } selbuf;
  70
  71 /*----- Functions provided ------------------------------------------------*/
  72
  73 /* --- @selbuf_enable@ --- *
  74  *
  75  * Arguments:   @selbuf *b@ = pointer to buffer block
  76  *
  77  * Returns:     ---
  78  *
  79  * Use:         Enables a buffer for reading, and emits any queued lines
  80  *              to the buffer's owner.
  81  */
  82
  83 extern void selbuf_enable(selbuf */*b*/);
  84
  85 /* --- @selbuf_disable@ --- *
  86  *
  87  * Arguments:   @selbuf *b@ = pointer to a buffer block
  88  *
  89  * Returns:     ---
  90  *
  91  * Use:         Disables a buffer.  It won't be read from until it's
  92  *              enabled again.
  93  */
  94
  95 extern void selbuf_disable(selbuf */*b*/);
  96
  97 /* --- @selbuf_setsize@ --- *
  98  *
  99  * Arguments:   @selbuf *b@ = pointer to buffer block
 100  *              @size_t sz@ = size of buffer
 101  *
 102  * Returns:     ---
 103  *
 104  * Use:         Sets the size of the buffer used for reading lines.
 105  */
 106
 107 extern void selbuf_setsize(selbuf */*b*/, size_t /*sz*/);
 108
 109 /* --- @selbuf_init@ --- *
 110  *
 111  * Arguments:   @selbuf *b@ = pointer to buffer block
 112  *              @sel_state *s@ = pointer to select state to attach to
 113  *              @int fd@ = file descriptor to listen to
 114  *              @lbuf_func *func@ = function to call
 115  *              @void *p@ = argument for function
 116  *
 117  * Returns:     ---
 118  *
 119  * Use:         Initializes a buffer block.
 120  */
 121
 122 extern void selbuf_init(selbuf */*b*/, sel_state */*s*/, int /*fd*/,
 123                         lbuf_func */*func*/, void */*p*/);
 124
 125 /* --- @selbuf_destroy@ --- *
 126  *
 127  * Arguments:   @selbuf *b@ = pointer to buffer block
 128  *
 129  * Returns:     ---
 130  *
 131  * Use:         Deallocates a line buffer and frees any resources it owned.
 132  */
 133
 134 extern void selbuf_destroy(selbuf */*b*/);
 135
 136 /*----- That's all, folks -------------------------------------------------*/
 137
 138 #ifdef __cplusplus
 139   }
 140 #endif
 141
 142 #endif