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1 | /* -*-c-*- |
2 | * |
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3 | * Manipulates flags on file descriptors |
4 | * |
5 | * (c) 1999 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of the mLib utilities library. |
11 | * |
12 | * mLib is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * mLib 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 Library 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 Library General Public |
23 | * License along with mLib; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
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28 | /*----- Header files ------------------------------------------------------*/ |
29 | |
30 | #include <stdio.h> |
31 | #include <stdlib.h> |
32 | #include <string.h> |
33 | |
34 | #include <fcntl.h> |
35 | |
36 | #include "fdflags.h" |
37 | |
38 | /*----- Main code ---------------------------------------------------------*/ |
39 | |
40 | /* --- @fdflags@ --- * |
41 | * |
42 | * Arguments: @int fd@ = file descriptor to fiddle with |
43 | * @unsigned fbic, fxor@ = file flags to set and clear |
44 | * @unsigned fdbic, fdxor@ = descriptor flags to set and clear |
45 | * |
46 | * Returns: Zero if successful, @-1@ if not. |
47 | * |
48 | * Use: Sets file descriptor flags in what is, I hope, an obvious |
49 | * way. |
50 | */ |
51 | |
52 | int fdflags(int fd, unsigned fbic, unsigned fxor, |
53 | unsigned fdbic, unsigned fdxor) |
54 | { |
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55 | int f, ff; |
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56 | |
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57 | if (fbic || fxor) { |
58 | if ((f = fcntl(fd, F_GETFL)) == -1) |
59 | return (-1); |
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60 | ff = (f & ~fbic) ^ fxor; |
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61 | if (f != ff && fcntl(fd, F_SETFL, ff) == -1) |
62 | return (-1); |
63 | } |
64 | if (fdbic || fdxor) { |
65 | if ((f = fcntl(fd, F_GETFD)) == -1) |
66 | return (-1); |
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67 | ff = (f & ~fdbic) ^ fdxor; |
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68 | if (f != ff && fcntl(fd, F_SETFD, ff) == -1) |
69 | return (-1); |
70 | } |
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71 | return (0); |
72 | } |
73 | |
74 | /*----- That's all, folks -------------------------------------------------*/ |