sysconf(2)sysconf(2)NAMEsysconf(), CPU_IS_PA_RISC() - get configurable system variables
SYNOPSISDESCRIPTION
The system call provides a way for applications to determine the cur‐
rent value of a configurable limit or variable.
The name argument represents the system variable being queried.
The following table lists the configuration variable name, the associ‐
ated value for the name argument that is used in the call and the value
returned.
is described in the entry for
Some of the variables in the table are defined as constants in (see
limits(5)). The associated values of the name argument are defined in
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Configuration Variable (Value for name Argument)
Value Returned by sysconf()
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Version number of OSF/AES OSC sup‐
ported.
Maximum number of aio operations
that can be specified in a
call (see lio_listio(2)).
Maximum number of aio operations
that can be queued at any time
(see
aio(5)).
Maximum slowdown factor that can
be specified in the
field of a structure (see aio(5)).
Maximum total length of the argu‐
ments for
in bytes, including environment data (see
exec(2)).
Maximum number of functions that
can be registered with
(see atexit(3)).
Maximum
ibase (input number radix) and obase
(output number radix) allowed by (see
bc(1)).
Maximum number of elements in an
array permitted by
(see bc(1)).
Maximum scale factor (number of
digits to the right of the decimal
point)
allowed by (see bc(1)).
Maximum length of strings allowed
by
(see bc(1)).
Positive if the implementation
supports multiple
locality domains; otherwise (see
mpctl(2)).
Maximum number of simultaneous
processes
per user ID (see fork(2)).
Number of clock intervals per sec‐
ond for
(see times(2)).
Number of clock ticks per second
for
(see clock(3C)).
Maximum number of weights that can
be assigned to an entry
of the order keyword in a input file (see
localedef(1M)).
systems:
CPUID Register 3 of the Itanium-based
processor identification registers. See
the Itanium-based architecture definition
for this platform for the meaning of each
bit.
Itanium-based systems:
CPUID Register 4 of the Itanium-based
processor identification registers. See
the Itanium-based architecture definition
for this platform for the meaning of each
bit.
PA-RISC: Processor Extensions. The
availability of architecture specific
instructions is indicated by the key bit
data returned by Upon successful comple‐
tion, the data returned will be the logi‐
cal OR of the defined values for the fea‐
tures supported.
The possible values returned by and their
meanings for PA-RISC platforms are shown
in the following table.
Return Value Instruction Supported
Halfword parallel add, subtract, and
average
Halfword parallel shift-and-add
Version of CPU architecture.
The possible values of the variable
returned by and their meanings are:
Value Meaning
HP Precision Architecture RISC Version
1.0
HP Precision Architecture RISC Version
1.1
HP Precision Architecture RISC Version
2.0
HP Itanium-based Architecture Version 0
The function classifies cpuvers, a value
of the variable, as to its processor fam‐
ily.
Maximum timer overrun count.
Maximum parenthesis nesting level
for
expressions (see expr(1)).
Maximum
data buffer size.
Maximum
data buffer size.
Maximum length of a host name (not
including the terminating null)
(see
gethostname(2)).
if the hardware is capable of
HyperThreading.
if the hardware is not capable of
HyperThreading.
Note: The value returned may
change during the lifetime of
the calling process, if the
system administrator changes
the hardware configuration.
if the hardware is Hyper‐
Threading enabled and OS
supports HyperThreading.
if the hardware is not
HyperThreading enabled.
Note: The value
returned may change dur‐
ing the lifetime of the
calling process, if the
system administrator
changes the hardware
configuration.
Returns which kernel
is supported on the
hardware.
The value returned is an
encoding that may be inter‐
preted using the and macros
defined in
For example:
Type of I/O drivers
the kernel supports;
currently, only the value
Returns the number
of bits used by the
kernel for pointer
and long data types. Cur‐
rent values include 32 and
64.
The version of libc
that is in use by
the application
that is requesting this
information.
The format of the value
returned by is XXyyZZZZqN,
where:
XX HP-UX major release
number
yy HP-UX minor release
number
ZZZZ Library-specific
number
q One of the following
values:
32PA
64PA
32EM
64EM
Reserved
N One of the following
values:
Archive library
System V version of
shared library
Maximum number of
bytes in an input
line
(including the newline) for
POSIX.2 utilities.
Maximum length of
user name in bytes.
Not supported.
Positive if the sys‐
tem supports POSIX
memory locking (see
mlockall(2), munlock‐
all(2)).
Positive if the sys‐
tem supports POSIX
memory range lock‐
ing.
Not supported.
Positive if the sys‐
tem supports POSIX
message queues.
Maximum number of
per-process open
message queue
descriptors.
Maximum limit for
message priority.
Maximum number of
simultaneous supple‐
mentary group IDs
per process.
Maximum number of
files that one
process can have
open at one time.
Kernel memory page
size.
Maximum number of
significant bytes in
a password.
Equal to
if the Advisory Information
option is supported; other‐
wise.
Positive if the sys‐
tem supports POSIX
Asynchronous Input
and Output.
Equal to
if the Barriers option is
supported; otherwise.
Equal to
if the Clock Selection
option is supported; other‐
wise.
Equal to
if the Process CPU-Time
Clocks option is supported;
otherwise.
Positive if the File
Synchronization
option is supported
(see
fsync(2)).
Equal to
if the IPv6 option is sup‐
ported; otherwise.
Positive if the sys‐
tem supports POSIX
job control;
otherwise.
Positive if the sys‐
tem supports POSIX
memory locking (see
mlockall(2), munlock‐
all(2)).
Positive if the sys‐
tem supports POSIX
memory mapped files.
Positive if the sys‐
tem supports POSIX
memory range lock‐
ing.
Positive if the sys‐
tem supports POSIX
memory protection.
Positive if the sys‐
tem supports POSIX
Prioritized Input
and Output.
Equal to
if the Monotonic Clock
option is supported; other‐
wise.
Positive if the sys‐
tem supports POSIX
message queues.
Positive if the sys‐
tem supports POSIX.4
priority scheduling;
otherwise.
Equal to
if the Raw Sockets option
is supported; otherwise.
Equal to
if the Read-Write Locks
option is supported; other‐
wise.
Positive if the sys‐
tem supports POSIX.4
real time signal
extensions;
otherwise.
Equal to
if the Regular Expression
Handling option is sup‐
ported; otherwise.
Positive if each
process has a saved
set-user-ID
and a saved set-group-ID;
otherwise.
Positive if the sys‐
tem supports POSIX
semaphores.
Positive if the sys‐
tem supports POSIX
shared memory.
Equal to
if the POSIX shell is sup‐
ported; otherwise.
Equal to
if the Spawn option is sup‐
ported; otherwise.
Equal to
if the Spin Locks option is
supported; otherwise.
Equal to
if the Process Sporadic
Server option is supported;
otherwise.
Not supported.
Positive if the Syn‐
chronized IO option
is supported (see
open(2)).
Positive if the
implementation sup‐
ports the POSIX
Thread Stack
Address Attribute option;
otherwise.
Positive if the
implementation sup‐
ports the POSIX
Thread Stack
Size Attribute option; oth‐
erwise.
Equal to
if the Thread CPU-Time
Clocks option is supported;
otherwise.
Positive if the
implementation sup‐
ports the
POSIX Thread Priority
Scheduling option; other‐
wise.
Positive if the
implementation sup‐
ports the POSIX
Thread Priority Inheritance
option; otherwise.
Positive if the
implementation sup‐
ports the POSIX
Thread Priority Protection
option; otherwise.
Positive if the
implementation sup‐
ports the POSIX
Thread Process-Shared Syn‐
chronization option; other‐
wise.
Positive if the
implementation sup‐
ports the POSIX
Thread Thread-Safe Func‐
tions option; otherwise.
Equal to
if the Thread Sporadic
Server option is supported;
otherwise.
Positive if the
implementation sup‐
ports POSIX threads;
otherwise.
Equal to
if the Timeouts option is
supported; otherwise.
Positive if the sys‐
tem supports POSIX.4
clocks and timers;
otherwise.
Equal to
if the Trace option is sup‐
ported; otherwise.
Equal to
if the Trace Event Filter
option is supported; other‐
wise.
Maximum length of
the trace event
name.
Equal to
if the Trace Inherit option
is supported; otherwise.
Equal to
if the Trace Log option is
supported; otherwise.
Maximum length of
the trace generation
version string or
of the trace stream name.
Maximum number of
trace streams that
may simultaneously
exist in the system.
Maximum number of
user trace event
type identifiers
that may simultane‐
ously
exist in a traced process
Maximum length of a
terminal device
name.
Equal to
if the Typed Memory Objects
option is supported; other‐
wise.
Approval date of the
POSIX.1 Standard
(such as 199009 for
POSIX.1-1990) to which the
system conforms. This
value indicates the year
(first four digits) and
month (next two digits)
that the standard was
approved by the IEEE Stan‐
dards Board.
Equal to
if the POSIX.2 C Language
Bindings Option is avail‐
able through the utility;
otherwise.
Equal to
if the POSIX.2 C Language
Development Utilities
Option is supported; other‐
wise.
Current version of
the POSIX.2
C Language Binding Option
supported (same format as
otherwise.
Equal to
if the POSIX.2 FORTRAN
Development Utilities
Option is supported; other‐
wise.
Equal to
if the POSIX.2 Fortran Run‐
time Utilities Option is
supported; otherwise.
Equal to
if locales can be created
with the POSIX.2 localedef
utility; otherwise.
Equal to
if the Batch Environment
Services and Utilities
option is supported; other‐
wise.
Equal to
if the Batch Accounting
option is supported; other‐
wise.
Equal to
if the Batch Check‐
point/Restart option is
supported; otherwise.
Equal to
if the Locate Batch job
request option is sup‐
ported; otherwise.
Equal to
if the Batch Job Message
Request option is sup‐
ported; otherwise.
Equal to
if the Track Batch Job
Request option is sup‐
ported; otherwise.
Equal to
if the POSIX.2 Software
Development Utilities
Option is supported; other‐
wise.
Equal to
if the POSIX.2 User Porta‐
bility Utilities Option is
supported; otherwise.
Current version of
POSIX.2 (same format
as
Not supported.
Positive if the
implementation sup‐
ports the Processor
Set Functions; otherwise.
Equal to
if the optional HP Process
Resource Management (PRM)
software is installed and
configured; otherwise (see
prmconfig(1)).
The number of
attempts made to
destroy a pthread's
thread-specific data values
on thread exit.
The number of
pthread data keys
per process.
Minimum size in
bytes of pthread
stack storage.
Maximum number of
pthreads that can be
created per process.
Maximum number of
repeated occurrences
of a regular expres‐
sion permitted
when using the interval
notation (see regcomp(3C)).
Maximum number of
realtime signals
reserved for application
use.
(No DoD security
level supported).
Positive if the sys‐
tem supports POSIX
semaphores.
Maximum number of
open semaphores per
process.
Maximum semaphore
value.
Positive if the sys‐
tem supports POSIX
shared memory.
Maximum number of
queued signals
that a process may send and
have pending at the
receivers at any time.
Maximum number of
streams that one process
can have open at one time.
Maximum number of
POSIX.4 timers per
process,
if POSIX.4 timers are sup‐
ported; otherwise.
Value of
Maximum number of
bytes in a time zone
name for the
environment variable.
Equal to
if the X/Open Encryption
Feature Group is supported;
otherwise.
Equal to
if the X/Open Enhanced
Internationalization Fea‐
ture Group is supported;
otherwise.
Not supported.
Not supported.
Not supported.
Equal to
if the X/Open Shared Memory
Feature Group is supported;
otherwise.
Equal to
if the Streams option is
supported; otherwise.
Issue number of
supported.
A flag that denotes
whether
and are supported by A
return value of indicates
they are not supported.
A flag that denotes
whether
and are supported by A
return value of indicates
they are not supported.
A flag that denotes
whether
and are supported by A
return value of indicates
they are not supported.
A flag that denotes
whether
and are supported by A
return value of indicates
they are not supported.
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RETURN VALUE
Upon successful completion, returns the value of the
named variable. If the value of name is not recognized,
returns and sets to If the value in name is defined but
is not supported in this environment, returns but does
not change
returns positive nonzero if cpuvers is an HP PA-RISC pro‐
cessor; zero if not.
ERRORS
If fails, the value of (see errno(2)) is set to:
The value of name is not valid.
EXAMPLES
The following example determines the number of times the
system clock ticks each second:
...
The following example determines if the current processor
is an HP PA-RISC machine:
...
WARNINGS
is implemented as a macro.
Normally, the values returned from do not change during
the lifetime of the calling process. However, the value
of the symbolic constant and thus the value of can vary
under certain circumstances. If either of the feature
test macros or is defined by the programmer prior to
including the value of is defined as in conformance with
POSIX.1-1988, FIPS 151-1, and XPG3. Otherwise, the value
of is defined as in conformance with POSIX.1-1990.
Similarly, the value of the symbolic constant and thus
the value of can vary under certain circumstances. If
the feature test macro is defined by the programmer prior
to including the value of is defined as in conformance
with XPG3. Otherwise, the value of is defined as in con‐
formance with XPG4.
See stdsyms(5) for more information about these feature
test macros.
Any application that has a dependency on libdld.sl is a
potential user of both archived and shared libc. Appli‐
cations that comprise both archived and shared components
where may be invoked from both the archived and shared
components may get inconsistent return values from
AUTHOR
was developed by HP and POSIX.
was developed by HP.
SEE ALSObc(1), expr(1), getconf(1), prmconfig(1), localedef(1M),
errno(2), exec(2), fork(2), fsync(2), gethostname(2),
getrlimit(2), lio_listio(2), mlockall(2), mpctl(2),
munlockall(2), open(2), pathconf(2), times(2), atexit(3),
clock(3C), confstr(3C), regcomp(3C), aio(5), limits(5),
stdsyms(5), thread_safety(5), unistd(5).
HP Process Resource Manager: prmconfig(1) in
STANDARDS CONFORMANCEsysconf(2)
