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RedHat 9 (Linux i386) - man page for nice (redhat section 2)

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

       nice - change process priority

       #include <unistd.h>

       int nice(int inc);

       nice adds inc to the nice value for the calling pid.  (A large nice value means a low pri-
       ority.)	Only the superuser may specify a negative increment, or priority increase.

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

       EPERM  A non-super user attempts to do a priority increase by supplying a negative inc.

       SVr4, SVID EXT, AT&T, X/OPEN, BSD 4.3. However, the Linux and glibc  (earlier  than  glibc
       2.2.4)  return value is nonstandard, see below.	SVr4 documents an additional EINVAL error

       Note that the routine is documented in SUSv2 to return the new nice value, while the Linux
       syscall and (g)libc (earlier than glibc 2.2.4) routines return 0 on success.  The new nice
       value can be found using getpriority(2).   Note	that  an  implementation  in  which  nice
       returns	the  new nice value 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), getpriority(2), setpriority(2), fork(2), renice(8)

Linux					    2001-06-04					  NICE(2)
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