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1 | /* -*-c-*- |
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2 | * |
| 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 -------------------------------------------------*/ |
~mdw / mLib / blame