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nice(2) -- Linux man page
NAME
nice - change process priority
SYNOPSIS
#include <unistd.h>
int nice(int inc);
DESCRIPTION
nice
adds
inc
to the nice value for the calling pid.
(A large nice value means a low priority.)
Only the superuser may specify a negative increment, or priority increase.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and
errno
is set appropriately.
ERRORS
- EPERM
-
A non-super user attempts to do a priority increase
by supplying a negative
inc.
CONFORMING TO
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 code.
NOTES
Note that the routine is documented in SUSv2 and POSIX 1003.1-2003
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.
SEE ALSO
nice(1),
getpriority(2),
setpriority(2),
fork(2),
renice(8)
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