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NICE(2) 		   Linux Programmers Manual		      NICE(2)

       nice - change process priority


       int nice(int inc);

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


       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).

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

       EPERM  The  calling  process attempted to increase its priority by sup
	      plying 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).)

       SVr4, 4.3BSD, POSIX.1-2001.  However, the Linux	and  (g)libc  (earlier
       than  glibc 2.2.4) return value is non-standard, see below.  SVr4 docu
       ments an additional EINVAL error code.

       SUSv2 and POSIX.1-2001 specify that nice() should return the  new  nice
       value.  However, the Linux syscall and the nice() library function pro
       vided 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).

       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.

       nice(1),   fork(2),  getpriority(2),  setpriority(2),  capabilities(7),

       This page is part of release 3.05 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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