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Linux 2.6 - man page for nice (linux section 2)

NICE(2) 			    Linux Programmer's Manual				  NICE(2)

NAME
       nice - change process priority

SYNOPSIS
       #include <unistd.h>

       int nice(int inc);

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

       nice(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE

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  setr-
	      limit(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 (ear-
       lier than glibc 2.2.4) return 0 on success.  The new nice value can be found using getpri-
       ority(2).

       Since  glibc  2.2.4, nice() is implemented as a library function that calls getpriority(2)
       to obtain the new nice value to be returned to the caller.  With  this  implementation,	a
       successful  call  can legitimately return -1.  To reliably detect an error, set errno to 0
       before the call, and check its value when nice() returns -1.

SEE ALSO
       nice(1), renice(1), fork(2), getpriority(2), setpriority(2), capabilities(7)

COLOPHON
       This page is part of release 3.55 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/.

Linux					    2007-07-26					  NICE(2)


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