sysconf.2 (2010 09)

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sysconf(2) sysconf(2)

NAME

sysconf(), CPU_IS_PA_RISC() - get conﬁgurable system variables

SYNOPSIS

#include <unistd.h>

long sysconf(int name);

int CPU_IS_PA_RISC(long

cpuvers );

DESCRIPTION

The sysconf() system call provides a way for applications to determine the current 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 associated value for the name argument

that is used in the

sysconf() call and the value returned.

CPU_IS_PA_RISC()

is described in the entry for CPU_VERSION.

Some of the variables in the table are deﬁned as constants in

<limits.h> (see limits (5)). The associ-

ated values of the name argument are deﬁned in

<unistd.h>.

__________________________________________________________________________________________________

Configuration Variable (Value for name Argument)

Value Returned by sysconf()

__________________________________________________________________________________________________

AES_OS_VERSION (_SC_AES_OS_VERSION

)

Version number of OSF/AES OSC supported.

AIO_LISTIO_MAX (_SC_AIO_LISTIO_MAX

)

Maximum number of aio operations that can be speciﬁed in a

lio_listio() call (see lio_listio (2)).

AIO_MAX (_SC_AIO_MAX)

Maximum number of aio operations that can be queued at any time (see

aio(5)).

AIO_PRIO_DELTA_MAX

(_SC_AIO_PRIO_DELTA_MAX)

Maximum slowdown factor that can be speciﬁed in the

aio_reqprio

ﬁeld of a aiocb structure (see aio (5)).

ARG_MAX (_SC_ARG_MAX)

Maximum total length of the arguments for

exec() in bytes, including

environment data (see exec (2)).

ATEXIT_MAX (_SC_ATEXIT_MAX)

Maximum number of functions that can be registered with

atexit()

(see atexit (3)).

BC_BASE_MAX (_SC_BC_BASE_MAX)

Maximum ibase (input number radix) and obase (output number radix)

allowed by

bc (see bc(1)).

BC_DIM_MAX (_SC_BC_DIM_MAX)

Maximum number of elements in an array permitted by

bc (see bc(1)).

BC_SCALE_MAX (_SC_BC_SCALE_MAX)

Maximum scale factor (number of digits to the right of the decimal point)

allowed by

bc (see bc(1)).

BC_STRING_MAX (_SC_BC_STRING_MAX)

HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

Summary of content (12 pages)

PAGE 1
sysconf(2) sysconf(2) NAME sysconf(), CPU_IS_PA_RISC() - get configurable system variables SYNOPSIS #include long sysconf(int name ); int CPU_IS_PA_RISC(long cpuvers ); DESCRIPTION The sysconf() system call provides a way for applications to determine the current value of a configurable limit or variable. The name argument represents the system variable being queried.
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sysconf(2) sysconf(2) Maximum length of strings allowed by bc (see bc(1)). CCNUMA_SUPPORT (_SC_CCNUMA_SUPPORT) Positive if the implementation supports multiple locality domains; -1 otherwise (see mpctl (2)). CHILD_MAX (_SC_CHILD_MAX) Maximum number of simultaneous processes per user ID (see fork (2)). CLK_TCK (_SC_CLK_TCK) Number of clock intervals per second for times() (see times (2)). CLOCKS_PER_SEC (_SC_CLOCKS_PER_SEC) Number of clock ticks per second for clock() (see clock (3C)).
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sysconf(2) sysconf(2) Maximum parenthesis nesting level for expr expressions (see expr (1)). EXTENDED_LOGIN_NAME (_SC_EXTENDED_LOGIN_NAME) Equal to 1 if the optional Numeric User Group Name feature is installed (see usergroupname(5)); 0 otherwise. GETGR_R_SIZE_MAX (_SC_GETGR_R_SIZE_MAX) Maximum getgrgid_r(), getgrnam_r() data buffer size. GETPW_R_SIZE_MAX (_SC_GETPW_R_SIZE_MAX) Maximum getpwuid_r(), getpwnam_r() data buffer size.
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sysconf(2) sysconf(2) XX HP-UX major release number yy HP-UX minor release number ZZZZ Library-specific number q One of the following values: 0 32PA 1 64PA 2 32EM 3 64EM 4−9 Reserved N One of the following values: 0 Archive library 1−9 System V version of shared library LINE_MAX (_SC_LINE_MAX) Maximum number of bytes in an input line (including the newline) for POSIX.2 utilities. LOGIN_NAME_MAX (_SC_LOGIN_NAME_MAX) Maximum length of user name in bytes.
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sysconf(2) PAGE_SIZE sysconf(2) (_SC_PAGE_SIZE) Kernel memory page size. PASS_MAX (_SC_PASS_MAX) Maximum number of significant bytes in a password. POSIX_ADVISORY_INFO (_SC_ADVISORY_INFO) Equal to 200112 Note: The value returned may change during the lifetime of the calling process, if the system administrator changes the hardware configuration. if the Advisory Information option is supported; -1 otherwise.
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sysconf(2) sysconf(2) Positive if the system supports POSIX.4 priority scheduling; -1 otherwise. POSIX_RAW_SOCKETS (_SC_RAW_SOCKETS) Equal to 200112 if the Raw Sockets option is supported; -1 otherwise. POSIX_READER_WRITER_LOCKS (_SC_READER_WRITER_LOCKS) Equal to 200112 if the Read-Write Locks option is supported; -1 otherwise. POSIX_REALTIME_SIGNALS (_SC_REALTIME_SIGNALS) Positive if the system supports POSIX.4 real time signal extensions; -1 otherwise.
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sysconf(2) sysconf(2) POSIX_THREAD_PRIORITY_SCHEDULING (_SC_THREAD_PRIORITY_SCHEDULING) Positive if the implementation supports the POSIX Thread Priority Scheduling option; -1 otherwise. POSIX_THREAD_PRIO_INHERIT (_SC_THREAD_PRIO_INHERIT) Positive if the implementation supports the POSIX Thread Priority Inheritance option; -1 otherwise. POSIX_THREAD_PRIO_PROTECT (_SC_THREAD_PRIO_PROTECT) Positive if the implementation supports the POSIX Thread Priority Protection option; -1 otherwise.
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sysconf(2) sysconf(2) Maximum number of trace streams that may simultaneously exist in the system. POSIX_TRACE_USER_EVENT_MAX (_SC_TRACE_USER_EVENT_MAX) Maximum number of user trace event type identifiers that may simultaneously exist in a traced process POSIX_TTY_NAME_MAX (_SC_TTY_NAME_MAX) Maximum length of a terminal device name. POSIX_TYPED_MEMORY_OBJECTS (_SC_TYPED_MEMORY_OBJECTS) Equal to 200112 if the Typed Memory Objects option is supported; -1 otherwise.
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sysconf(2) POSIX2_PBS_MESSAGE sysconf(2) (_SC_2_PBS_MESSAGE) Equal to 200112 if the Batch Job Message Request option is supported; -1 otherwise. POSIX2_PBS_TRACK (_SC_2_PBS_TRACK) Equal to 200112 if the Track Batch Job Request option is supported; -1 otherwise. POSIX2_SW_DEV (_SC_2_SW_DEV) Equal to 1 if the POSIX.2 Software Development Utilities Option is supported; -1 otherwise. POSIX2_UPE (_SC_2_UPE) Equal to 1 if the POSIX.2 User Portability Utilities Option is supported; -1 otherwise.
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sysconf(2) sysconf(2) Maximum semaphore value. SHARED_MEMORY_OBJECTS (_SC_SHARED_MEMORY_OBJECTS) Positive if the system supports POSIX shared memory. SIGQUEUE_MAX (_SC_SIGQUEUE_MAX) Maximum number of queued signals that a process may send and have pending at the receivers at any time. STREAM_MAX (_SC_STREAM_MAX) Maximum number of stdio streams that one process can have open at one time. TIMER_MAX (_SC_TIMER_MAX) Maximum number of POSIX.4 timers per process, if POSIX.
PAGE 11
sysconf(2) sysconf(2) confstr(). A return value of -1 indicates they are not supported. (_SC_XBS5_LP64_OFF64) XBS5_LP64_OFF64 A flag that denotes whether _CS_XBS5_LP64_OFF64_CFLAGS, _CS_XBS5_LP64_OFF64_LDFLAGS, _CS_XBS5_LP64_OFF64_LIBS and _CS_XBS5_LP64_OFF64_LINTFLAGS are supported by confstr(). A return value of -1 indicates they are not supported.
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sysconf(2) sysconf(2) AUTHOR sysconf() was developed by HP and POSIX. CPU_IS_PA_RISC() was developed by HP. SEE ALSO bc(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), usergroupname(5).