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1 | /* -*-c-*- |
2 | * |
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3 | * $Id$ |
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4 | * |
5 | * Manipulates flags on file descriptors |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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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. |
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18 | * |
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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. |
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23 | * |
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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 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <stdio.h> |
33 | #include <stdlib.h> |
34 | #include <string.h> |
35 | |
36 | #include <fcntl.h> |
37 | |
38 | #include "fdflags.h" |
39 | |
40 | /*----- Main code ---------------------------------------------------------*/ |
41 | |
42 | /* --- @fdflags@ --- * |
43 | * |
44 | * Arguments: @int fd@ = file descriptor to fiddle with |
45 | * @unsigned fbic, fxor@ = file flags to set and clear |
46 | * @unsigned fdbic, fdxor@ = descriptor flags to set and clear |
47 | * |
48 | * Returns: Zero if successful, @-1@ if not. |
49 | * |
50 | * Use: Sets file descriptor flags in what is, I hope, an obvious |
51 | * way. |
52 | */ |
53 | |
54 | int fdflags(int fd, unsigned fbic, unsigned fxor, |
55 | unsigned fdbic, unsigned fdxor) |
56 | { |
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57 | int f, ff; |
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58 | |
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59 | if (fbic || fxor) { |
60 | if ((f = fcntl(fd, F_GETFL)) == -1) |
61 | return (-1); |
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62 | ff = (f & ~fbic) ^ fxor; |
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63 | if (f != ff && fcntl(fd, F_SETFL, ff) == -1) |
64 | return (-1); |
65 | } |
66 | if (fdbic || fdxor) { |
67 | if ((f = fcntl(fd, F_GETFD)) == -1) |
68 | return (-1); |
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69 | ff = (f & ~fdbic) ^ fdxor; |
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70 | if (f != ff && fcntl(fd, F_SETFD, ff) == -1) |
71 | return (-1); |
72 | } |
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73 | return (0); |
74 | } |
75 | |
76 | /*----- That's all, folks -------------------------------------------------*/ |