3 * $Id: selbuf.c,v 1.3 1999/05/22 13:41:00 mdw Exp $
5 * Line-buffering select handler
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the mLib utilities library.
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.
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.
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,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.3 1999/05/22 13:41:00 mdw
34 * Fix end-of-file detection and error handling.
36 * Revision 1.2 1999/05/17 20:36:50 mdw
37 * Make the magical constants for the buffer flags uppercase.
39 * Revision 1.1 1999/05/14 21:01:15 mdw
40 * Integrated `select' handling bits from the background resolver project.
44 /*----- Header files ------------------------------------------------------*/
51 #include <sys/types.h>
59 /*----- Main code ---------------------------------------------------------*/
61 /* --- @selbuf_enable@ --- *
63 * Arguments: @selbuf *b@ = pointer to buffer block
67 * Use: Enables a buffer for reading, and emits any queued lines
68 * to the buffer's owner.
71 void selbuf_enable(selbuf *b)
73 if (!(b->b.f & LBUF_ENABLE)) {
74 b->b.f |= LBUF_ENABLE;
75 sel_addfile(&b->reader);
76 lbuf_flush(&b->b, 0, 0);
80 /* --- @selbuf_disable@ --- *
82 * Arguments: @selbuf *b@ = pointer to a buffer block
86 * Use: Disables a buffer. It won't be read from until it's
90 void selbuf_disable(selbuf *b)
92 if (b->b.f & LBUF_ENABLE) {
93 b->b.f &= ~LBUF_ENABLE;
94 sel_rmfile(&b->reader);
98 /* --- @selbuf_read@ --- *
100 * Arguments: @int fd@ = file descriptor to read from
101 * @int mode@ = what we can do to the file
102 * @void *vp@ = pointer to buffer context
106 * Use: Acts on the result of a @select@ call.
109 static void selbuf_read(int fd, unsigned mode, void *vp)
116 sz = lbuf_free(&b->b, &p);
121 lbuf_flush(&b->b, p, n);
122 else switch (errno) {
125 #if EAGAIN != EWOULDBLOCK
134 /* --- @selbuf_init@ --- *
136 * Arguments: @selbuf *b@ = pointer to buffer block
137 * @sel_state *s@ = pointer to select state to attach to
138 * @int fd@ = file descriptor to listen to
139 * @void (*func)(char *s, void *p)@ = function to call
140 * @void *p@ = argument for function
144 * Use: Initializes a buffer block.
147 void selbuf_init(selbuf *b,
150 void (*func)(char */*s*/, void */*p*/),
153 lbuf_init(&b->b, func, p);
154 b->b.f &= ~LBUF_ENABLE;
155 sel_initfile(s, &b->reader, fd, SEL_READ, selbuf_read, b);
159 /*----- That's all, folks -------------------------------------------------*/