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nice(2)                    System Calls Manual                   nice(2)

НАЗВАНИЕ

       nice - change process priority

БИБЛИОТЕКА

       Standard C library (libc, -lc)

СИНТАКСИС

       #include <unistd.h>

       int nice(int inc);

   Feature Test Macro Requirements for glibc (see
   feature_test_macros(7)):

       nice():
           _XOPEN_SOURCE
               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

ОПИСАНИЕ

       nice() adds inc to the nice value for the calling thread.  (A
       higher nice value means a lower priority.)

       The range of the nice value is +19 (low priority) to -20 (high
       priority).  Attempts to set a nice value outside the range are
       clamped to the range.

       Traditionally, only a privileged process could lower the nice
       value (i.e., set a higher priority).  However, since Linux
       2.6.12, an unprivileged process can decrease the nice value of a
       target process that has a suitable RLIMIT_NICE soft limit; see
       getrlimit(2) for details.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       On success, the new nice value is returned (but see NOTES below).
       On error, -1 is returned, and errno is set to indicate the error.

       A successful call can legitimately return -1.  To detect an
       error, set errno to 0 before the call, and check whether it is
       nonzero after nice() returns -1.

ОШИБКИ

       EPERM  The calling process attempted to increase its priority by
              supplying a negative inc but has insufficient privileges.
              Under Linux, the CAP_SYS_NICE capability is required.
              (But see the discussion of the RLIMIT_NICE resource limit
              in setrlimit(2).)

ВЕРСИИ

   C library/kernel differences
       POSIX.1 specifies that nice() should return the new nice value.
       However, the raw Linux system call returns 0 on success.
       Likewise, the nice() wrapper function provided in glibc 2.2.3 and
       earlier returns 0 on success.

       Since glibc 2.2.4, the nice() wrapper function provided by glibc
       provides conformance to POSIX.1 by calling getpriority(2) to
       obtain the new nice value, which is then returned to the caller.

СТАНДАРТЫ

       POSIX.1-2008.

ИСТОРИЯ

       POSIX.1-2001, SVr4, 4.3BSD.

ПРИМЕЧАНИЯ

       For further details on the nice value, see sched(7).

       Note: the addition of the "autogroup" feature in Linux 2.6.38
       means that the nice value no longer has its traditional effect in
       many circumstances.  For details, see sched(7).

СМОТРИТЕ ТАКЖЕ

       nice(1), renice(1), fork(2), getpriority(2), getrlimit(2),
       setpriority(2), capabilities(7), sched(7)

КОЛОФОН

       This page is part of the man-pages (Linux kernel and C library
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       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
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       man-pages@man7.org

Linux man-pages 6.9.1          2024-05-02                        nice(2)

Страницы, которые ссылаются на эту страницу: nice(1), getpriority(2), getrlimit(2), sched_setaffinity(2), sched_setattr(2), sched_setparam(2), sched_setscheduler(2), syscalls(2), capabilities(7), sched(7)