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| Rev | Author | Line No. | Line |
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| 4973 | right-hear | 1 | /* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */ |
| 2 | #include |
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| 3 | #include |
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| 4 | |||
| 5 | /* The references disagree on the values of these. Higher value |
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| 6 | means less important process. */ |
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| 7 | #define NICE_MIN -20 |
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| 8 | #define NICE_MAX +20 |
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| 9 | #define NICE_USER 0 |
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| 10 | |||
| 11 | static int nice_val = NICE_USER; |
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| 12 | |||
| 13 | int nice (int incr) |
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| 14 | { |
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| 15 | if (incr < 0 && getuid () != 0) { |
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| 16 | errno = EPERM; |
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| 17 | return -1; |
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| 18 | } |
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| 19 | |||
| 20 | nice_val += incr; |
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| 21 | if (nice_val < NICE_MIN) nice_val = NICE_MIN; |
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| 22 | if (nice_val > NICE_MAX) nice_val = NICE_MAX; |
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| 23 | |||
| 24 | /* This is braindead by design! If -1 returned you don't know |
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| 25 | if you had an error! Luckily you can ignore errors for a |
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| 26 | function like this. */ |
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| 27 | errno = 0; |
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| 28 | return (nice_val - NICE_USER); |
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| 29 | } |