3 * $Id: selpk.c,v 1.3 2004/04/08 01:36:13 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 /*----- Header files ------------------------------------------------------*/
37 #include <sys/types.h>
45 /*----- Main code ---------------------------------------------------------*/
47 /* --- @selpk_enable@ --- *
49 * Arguments: @selpk *pk@ = pointer to buffer block
53 * Use: Enables a buffer for reading, and emits any queued packets
54 * to the buffer's owner.
57 void selpk_enable(selpk
*pk
)
59 if (!(pk
->pk
.f
& PKBUF_ENABLE
)) {
60 pk
->pk
.f
|= PKBUF_ENABLE
;
61 sel_addfile(&pk
->reader
);
62 pkbuf_flush(&pk
->pk
, 0, 0);
66 /* --- @selpk_disable@ --- *
68 * Arguments: @selpk *pk@ = pointer to a buffer block
72 * Use: Disables a buffer. It won't be read from until it's
76 void selpk_disable(selpk
*pk
)
78 if (pk
->pk
.f
& PKBUF_ENABLE
) {
79 pk
->pk
.f
&= ~PKBUF_ENABLE
;
80 sel_rmfile(&pk
->reader
);
84 /* --- @selpk_read@ --- *
86 * Arguments: @int fd@ = file descriptor to read from
87 * @int mode@ = what we can do to the file
88 * @void *vp@ = pointer to buffer context
92 * Use: Acts on the result of a @select@ call.
95 static void selpk_read(int fd
, unsigned mode
, void *vp
)
102 sz
= pkbuf_free(&pk
->pk
, &p
);
105 pkbuf_close(&pk
->pk
);
107 pkbuf_flush(&pk
->pk
, p
, n
);
108 else switch (errno
) {
111 #if EAGAIN != EWOULDBLOCK
116 pkbuf_close(&pk
->pk
);
120 /* --- @selpk_want@ --- *
122 * Arguments: @selpk *pk@ = pointer to buffer block
123 * @size_t sz@ = size of buffer
127 * Use: Sets the size of the packet to be read next.
130 void selpk_want(selpk
*pk
, size_t sz
)
132 pkbuf_want(&pk
->pk
, sz
);
135 /* --- @selpk_init@ --- *
137 * Arguments: @selpk *pk@ = pointer to buffer block
138 * @sel_state *s@ = pointer to select state to attach to
139 * @int fd@ = file descriptor to listen to
140 * @pkbuf_func *func@ = function to call
141 * @void *p@ = argument for function
145 * Use: Initializes a buffer block.
148 void selpk_init(selpk
*pk
, sel_state
*s
, int fd
, pkbuf_func
*func
, void *p
)
150 pkbuf_init(&pk
->pk
, func
, p
);
151 pk
->pk
.f
&= ~PKBUF_ENABLE
;
152 sel_initfile(s
, &pk
->reader
, fd
, SEL_READ
, selpk_read
, pk
);
156 /* --- @selpk_destroy@ --- *
158 * Arguments: @selpk *pk@ = pointer to buffer block
162 * Use: Deallocates a packet buffer and frees any resources it owned.
165 void selpk_destroy(selpk
*pk
)
168 pkbuf_destroy(&pk
->pk
);
171 /*----- That's all, folks -------------------------------------------------*/