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NICE(2) | Linux Programmer's Manual | NICE(2) |
NAME¶
nice - change process prioritySYNOPSIS¶
#include <unistd.h>Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTION¶
nice() adds inc to the nice value for the calling process. (A higher nice value means a low priority.) Only the superuser may specify a negative increment, or priority increase. The range for nice values is described in getpriority(2).RETURN VALUE¶
On success, the new nice value is returned (but see NOTES below). On error, -1 is returned, and errno is set appropriately.ERRORS¶
- 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).)
CONFORMING TO¶
SVr4, 4.3BSD, POSIX.1-2001. However, the Linux and (g)libc (earlier than glibc 2.2.4) return value is nonstandard, see below. SVr4 documents an additional EINVAL error code.NOTES¶
SUSv2 and POSIX.1-2001 specify that nice() should return the new nice value. However, the Linux syscall and the nice() library function provided in older versions of (g)libc (earlier than glibc 2.2.4) return 0 on success. The new nice value can be found using getpriority(2).SEE ALSO¶
nice(1), renice(1), fork(2), getpriority(2), setpriority(2), capabilities(7)COLOPHON¶
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.2007-07-26 | Linux |