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1 | /* -*-c-*- |
2 | * |
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3 | * Channel management |
4 | * |
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5 | * (c) 1999 Straylight/Edgeware |
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6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of the `fw' port forwarder. |
11 | * |
12 | * `fw' is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License as published by |
14 | * the Free Software Foundation; either version 2 of the License, or |
15 | * (at your option) any later version. |
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16 | * |
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17 | * `fw' is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU General Public License |
23 | * along with `fw'; if not, write to the Free Software Foundation, |
24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
25 | */ |
26 | |
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27 | #ifndef CHAN_H |
28 | #define CHAN_H |
29 | |
30 | #ifdef __cplusplus |
31 | extern "C" { |
32 | #endif |
33 | |
34 | /*----- Header files ------------------------------------------------------*/ |
35 | |
36 | #include <mLib/sel.h> |
37 | |
38 | /*----- Magic numbers -----------------------------------------------------*/ |
39 | |
40 | #define CHAN_BUFSZ 4096 |
41 | |
42 | /*----- Data structures ---------------------------------------------------*/ |
43 | |
44 | typedef struct chan { |
45 | unsigned base, len; /* Base and length of data */ |
46 | unsigned f; /* Various interesting flags */ |
47 | void (*func)(void */*p*/); /* Function to call on closure */ |
48 | void *p; /* Argument to pass function */ |
49 | sel_file r, w; /* Reader and writer selectors */ |
50 | char buf[CHAN_BUFSZ]; /* The actual data buffer */ |
51 | } chan; |
52 | |
53 | #define CHANF_CLOSE 1u /* Close channel when buffer empty */ |
54 | #define CHANF_READY 2u /* The channel destination exists */ |
55 | |
56 | /*----- Functions provided ------------------------------------------------*/ |
57 | |
58 | /* --- @chan_close@ --- * |
59 | * |
60 | * Arguments: @chan *c@ = pointer to channel |
61 | * |
62 | * Returns: --- |
63 | * |
64 | * Use: Closes down a channel prematurely. |
65 | */ |
66 | |
67 | extern void chan_close(chan */*c*/); |
68 | |
69 | /* --- @chan_dest@ --- * |
70 | * |
71 | * Arguments: @chan *c@ = pointer to channel |
72 | * @int fd@ = destination file descriptor for channel |
73 | * |
74 | * Returns: --- |
75 | * |
76 | * Use: Sets the channel's destination so it knows where to put |
77 | * data. |
78 | */ |
79 | |
80 | extern void chan_dest(chan */*c*/, int /*fd*/); |
81 | |
82 | /* --- @chan_open@ --- * |
83 | * |
84 | * Arguments: @chan *c@ = pointer to channel to open |
85 | * @int from, to@ = source and destination file descriptors |
86 | * @void (*func)(void *p)@ = function to call on closure |
87 | * @void *p@ = argument to pass to function |
88 | * |
89 | * Returns: --- |
90 | * |
91 | * Use: Opens a channel. Data is copied from the source to the |
92 | * destination. The @to@ argument may be @-1@ if the file |
93 | * descriptor isn't known yet. |
94 | */ |
95 | |
96 | extern void chan_open(chan */*c*/, int /*from*/, int /*to*/, |
97 | void (*/*func*/)(void */*p*/), void */*p*/); |
98 | |
99 | /*----- That's all, folks -------------------------------------------------*/ |
100 | |
101 | #ifdef __cplusplus |
102 | } |
103 | #endif |
104 | |
105 | #endif |