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+'\" et
+.TH NICE "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+nice
+\(em change the nice value of a process
+.SH SYNOPSIS
+.LP
+.nf
+#include <unistd.h>
+.P
+int nice(int \fIincr\fP);
+.fi
+.SH DESCRIPTION
+The
+\fInice\fR()
+function shall add the value of
+.IR incr
+to the nice value of the calling process. A nice value of a process is
+a non-negative number for which a more positive value shall result in
+less favorable scheduling.
+.P
+A maximum nice value of 2*{NZERO}\-1 and a minimum nice value of 0
+shall be imposed by the system. Requests for values above or below
+these limits shall result in the nice value being set to the
+corresponding limit. Only a process with appropriate privileges can
+lower the nice value.
+.P
+Calling the
+\fInice\fR()
+function has no effect on the priority of processes or threads with
+policy SCHED_FIFO or SCHED_RR.
+The effect on processes or threads with other scheduling policies is
+implementation-defined.
+.P
+The nice value set with
+\fInice\fR()
+shall be applied to the process. If the process is multi-threaded,
+the nice value shall affect all system scope threads in the process.
+.P
+As \-1 is a permissible return value in a successful situation, an
+application wishing to check for error situations should set
+.IR errno
+to 0, then call
+\fInice\fR(),
+and if it returns \-1, check to see whether
+.IR errno
+is non-zero.
+.SH "RETURN VALUE"
+Upon successful completion,
+\fInice\fR()
+shall return the new nice value \-{NZERO}.
+Otherwise, \-1 shall be returned, the nice value of the process
+shall not be changed, and
+.IR errno
+shall be set to indicate the error.
+.SH ERRORS
+The
+\fInice\fR()
+function shall fail if:
+.TP
+.BR EPERM
+The
+.IR incr
+argument is negative and the calling process does not have appropriate
+privileges.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+.SS "Changing the Nice Value"
+.P
+The following example adds the value of the
+.IR incr
+argument, \-20, to the nice value of the calling process.
+.sp
+.RS 4
+.nf
+
+#include <unistd.h>
+\&...
+int incr = -20;
+int ret;
+.P
+ret = nice(incr);
+.fi
+.P
+.RE
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIexec\fR\^",
+.IR "\fIgetpriority\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<limits.h>\fP",
+.IR "\fB<unistd.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .