3 * $Id: selpk.c,v 1.2 2002/01/13 13:33:51 mdw Exp $
5 * Packet-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 1.2 2002/01/13 13:33:51 mdw
34 * Packet handler functions now have a @typedef@ name.
36 * Revision 1.1 2000/06/17 10:39:19 mdw
37 * Experimental new support for packet buffering.
41 /*----- Header files ------------------------------------------------------*/
48 #include <sys/types.h>
56 /*----- Main code ---------------------------------------------------------*/
58 /* --- @selpk_enable@ --- *
60 * Arguments: @selpk *pk@ = pointer to buffer block
64 * Use: Enables a buffer for reading, and emits any queued packets
65 * to the buffer's owner.
68 void selpk_enable(selpk
*pk
)
70 if (!(pk
->pk
.f
& PKBUF_ENABLE
)) {
71 pk
->pk
.f
|= PKBUF_ENABLE
;
72 sel_addfile(&pk
->reader
);
73 pkbuf_flush(&pk
->pk
, 0, 0);
77 /* --- @selpk_disable@ --- *
79 * Arguments: @selpk *pk@ = pointer to a buffer block
83 * Use: Disables a buffer. It won't be read from until it's
87 void selpk_disable(selpk
*pk
)
89 if (pk
->pk
.f
& PKBUF_ENABLE
) {
90 pk
->pk
.f
&= ~PKBUF_ENABLE
;
91 sel_rmfile(&pk
->reader
);
95 /* --- @selpk_read@ --- *
97 * Arguments: @int fd@ = file descriptor to read from
98 * @int mode@ = what we can do to the file
99 * @void *vp@ = pointer to buffer context
103 * Use: Acts on the result of a @select@ call.
106 static void selpk_read(int fd
, unsigned mode
, void *vp
)
113 sz
= pkbuf_free(&pk
->pk
, &p
);
116 pkbuf_close(&pk
->pk
);
118 pkbuf_flush(&pk
->pk
, p
, n
);
119 else switch (errno
) {
122 #if EAGAIN != EWOULDBLOCK
127 pkbuf_close(&pk
->pk
);
131 /* --- @selpk_want@ --- *
133 * Arguments: @selpk *pk@ = pointer to buffer block
134 * @size_t sz@ = size of buffer
138 * Use: Sets the size of the packet to be read next.
141 void selpk_want(selpk
*pk
, size_t sz
)
143 pkbuf_want(&pk
->pk
, sz
);
146 /* --- @selpk_init@ --- *
148 * Arguments: @selpk *pk@ = pointer to buffer block
149 * @sel_state *s@ = pointer to select state to attach to
150 * @int fd@ = file descriptor to listen to
151 * @pkbuf_func *func@ = function to call
152 * @void *p@ = argument for function
156 * Use: Initializes a buffer block.
159 void selpk_init(selpk
*pk
, sel_state
*s
, int fd
, pkbuf_func
*func
, void *p
)
161 pkbuf_init(&pk
->pk
, func
, p
);
162 pk
->pk
.f
&= ~PKBUF_ENABLE
;
163 sel_initfile(s
, &pk
->reader
, fd
, SEL_READ
, selpk_read
, pk
);
167 /* --- @selpk_destroy@ --- *
169 * Arguments: @selpk *pk@ = pointer to buffer block
173 * Use: Deallocates a packet buffer and frees any resources it owned.
176 void selpk_destroy(selpk
*pk
)
179 pkbuf_destroy(&pk
->pk
);
182 /*----- That's all, folks -------------------------------------------------*/