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#include <unistd.h>
The nice() function adds incr to the scheduling priority of the process. The priority is a value in the range -20 to 20. The default priority is 0; lower priorities cause more favorable scheduling. Only the super-user may lower priorities.
Children inherit the priority of their parent processes via fork(2).
[EPERM] | |
The incr argument is negative and the caller does not have appropriate privileges. | |
NICE (3) | February 28, 2015 |
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“ | Modern Unix impedes progress in computer science, wastes billions of dollars, and destroys the common sense of many who seriously use it. | ” |
— The Unix Haters' handbook |