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.\" Copyright (c) 2009, 2017, Oracle and/or its affiliates. All rights reserved.
.TH p_online 2 "27 Nov 2017" "Oracle Solaris 11.4" "System Calls"
.SH NAME
p_online \- return or change processor operational status
.SH SYNOPSIS

.LP
.nf
#include <sys/types.h>
#include <sys/processor.h>

\fBint\fR \fBp_online\fR(\fBprocessorid_t\fR \fIprocessorid\fR, \fBint\fR \fIflag\fR);
.fi
.SH DESCRIPTION
.sp
.LP
The \fBp_online()\fR function changes or returns the operational status of processors. The state of the processor specified by the \fIprocessorid\fR argument is changed to the state represented by the \fIflag\fR argument.
.sp
.LP
Legal values for \fIflag\fR are \fBP_STATUS\fR, \fBP_ONLINE\fR, \fBP_OFFLINE\fR, \fBP_NOINTR\fR, \fBP_FAULTED\fR, \fBP_SPARE\fR, and \fBP_FORCED\fR.
.sp
.LP
When \fIflag\fR is \fBP_STATUS,\fR no processor status change occurs, but the current processor status is returned.
.sp
.LP
The \fBP_ONLINE\fR, \fBP_OFFLINE\fR, \fBP_NOINTR\fR, \fBP_FAULTED\fR, and \fBP_SPARE\fR values for \fIflag\fR refer to valid processor states. The \fBP_OFFLINE\fR, \fBP_SPARE\fR, and \fBP_FAULTED\fR processor states can be combined with the \fBP_FORCED\fR flag.
.sp
.LP
A processor in the \fBP_ONLINE\fR state is allowed to process \fBLWPs\fR (lightweight processes) and perform system activities. The processor is also interruptible by I/O devices attached to the system.
.sp
.LP
A processor in the \fBP_OFFLINE\fR state is not allowed to process \fBLWPs\fR. The processor is as inactive as possible. If the hardware supports such a feature, the processor is not interruptible by attached I/O devices.
.sp
.LP
A processor in the \fBP_NOINTR\fR state is allowed to process \fBLWPs\fR, but it is not interruptible by attached I/O devices. Typically, interrupts, when they occur are routed to other processors in the system. Not all systems support putting a processor into the \fBP_NOINTR\fR state. It is not permitted to put all the processors of a system into the \fBP_NOINTR\fR state. At least one processor must always be available to service system clock interrupts.
.sp
.LP
A processor in the \fBP_SPARE\fR state is not allowed to process LWPs. In many respects the \fBP_SPARE\fR state is similar to the \fBP_OFFLINE\fR state, but describes a processor that is available for reactivation by management tools without administrator intervention.
.sp
.LP
A processor in the \fBP_FAULTED\fR state is not allowed to process LWPs. In many respects the \fBP_FAULTED\fR state is similar to the \fBP_OFFLINE\fR state, but describes a processor that has been diagnosed as faulty. The privileged caller can change the state of the processor from \fBP_FAULTED\fR to any of the other states, but since the processor might generate additional errors, electing to reactivate such a processor should be carefully considered.
.sp
.LP
Forced processor state transition can be requested if a new processor state is specified with the bitwise-inclusive OR of the special \fBP_FORCED\fR flag. Forcing transition of a processor to the \fBP_OFFLINE\fR, \fBP_SPARE\fR, or \fBP_FAULTED\fR state revokes processor bindings for all threads that were previously bound to that processor with \fBprocessor_bind\fR(2). There is no guarantee that a forced processor state transition always succeeds.
.sp
.LP
Processor numbers are integers, greater than or equal to 0, and are defined by the hardware platform. Processor numbers are not necessarily contiguous, but "not too sparse." Processor numbers should always be printed in decimal.
.sp
.LP
The maximum possible \fIprocessorid\fR value can be determined by calling \fBsysconf(_SC_CPUID_MAX)\fR. The list of valid processor numbers can be determined by calling \fBp_online()\fR with \fIprocessorid\fR values from 0 to the maximum returned by \fBsysconf(_SC_CPUID_MAX)\fR. The \fBEINVAL\fR error is returned for invalid processor numbers. See \fBEXAMPLES\fR below.
.SH RETURN VALUES
.sp
.LP
On successful completion, the value returned is the previous state of the processor, \fBP_ONLINE\fR, \fBP_OFFLINE\fR, \fBP_NOINTR\fR, \fBP_FAULTED\fR, \fBP_SPARE\fR, or \fBP_POWEROFF\fR. Otherwise, \fB\(mi1\fR is returned, the CPU state remains unchanged, and \fBerrno\fR is set to indicate the error.
.SH ERRORS
.sp
.LP
The \fBp_online()\fR function will fail if:
.sp
.ne 2
.mk
.na
\fB\fBEBUSY\fR\fR
.ad
.RS 11n
.rt
The \fIflag\fR was \fBP_OFFLINE\fR or \fBP_SPARE\fR and the specified processor is the only on-line processor, there are currently \fBLWPs\fR bound to the processor, or the processor performs some essential function that cannot be performed by another processor.
.sp
The \fIflag\fR was \fBP_NOINTR\fR and the specified processor is the only interruptible processor in the system, or it handles interrupts that cannot be handled by another processor.
.sp
The specified processor is powered off and cannot be powered on because some platform-specific resource is not available.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 11n
.rt
A non-existent processor \fBID\fR was specified or \fIflag\fR was invalid.
.sp
The caller is in a non-global zone, the pools facility is active, and the processor is not a member of the zone's pool's processor set.
.RE

.sp
.ne 2
.mk
.na
\fB\fBENOTSUP\fR\fR
.ad
.RS 11n
.rt
The specified processor is powered off, and the platform does not support power on of individual processors.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEPERM\fR\fR
.ad
.RS 11n
.rt
The flag was not \fBP_STATUS\fR and the {\fBPRIV_SYS_RES_CONFIG\fR} privilege is not asserted in the effective set of the calling process.
.RE

.SH EXAMPLES
.LP
\fBExample 1\fR List the legal processor numbers.

.sp
.LP
The following code sample will list the legal processor numbers:

.sp
.in +2
.nf
#include <sys/unistd.h>
#include <sys/processor.h>
#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>

int
main()
{
        processorid_t i, cpuid_max;
        cpuid_max = sysconf(_SC_CPUID_MAX);
        for (i = 0; i <= cpuid_max; i++) {
              if (p_online(i, P_STATUS) != -1)
                        printf("processor %d present\en", i);
        }
        return (0);
}
.fi
.in -2
.sp
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp
.TS
tab(
) box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPE
ATTRIBUTE VALUE
_
MT-Level
MT-Safe
.TE
.sp
.SH SEE ALSO
.sp
.LP
\fBprocessor_bind\fR(2), \fBprocessor_info\fR(2), \fBpset_create\fR(2), \fBsysconf\fR(3C), \fBattributes\fR(7), \fBprivileges\fR(7), \fBpooladm\fR(8), \fBpsradm\fR(8), \fBpsrinfo\fR(8), \fBzoneadm\fR(8)