HP-UX Reference (11i v2 07/12) - 2 System Calls (vol 5)

s
sysconf(2) sysconf(2)
EXAMPLES
The following example determines the number of times the system clock ticks each second:
#include <unistd.h>
long ticks;
...
ticks = sysconf(_SC_CLK_TCK);
The following example determines if the current processor is an HP PA-RISC machine:
#include <unistd.h>
if (CPU_IS_PA_RISC(sysconf(_SC_CPU_VERSION)))
...
WARNINGS
CPU_IS_PA_RISC()
is implemented as a macro.
Normally, the values returned from
sysconf() do not change during the lifetime of the calling process.
However, the value of the symbolic constant
_POSIX_VERSION
and thus the value of
sysconf(_SC_VERSION)
can vary under certain circumstances. If either of the feature test macros
_POSIX1_1988 or _XPG3 is defined by the programmer prior to including <unistd.h> , the value of
_POSIX_VERSION is defined as
198808, in conformance with POSIX.1-1988, FIPS 151-1, and XPG3.
Otherwise, the value of
_POSIX_VERSION
is defined as 199009, in conformance with POSIX.1-1990.
Similarly, the value of the symbolic constant
_XOPEN_VERSION
and thus the value of
sysconf(_SC_XOPEN_VERSION)
can vary under certain circumstances. If the feature test macro
_XPG3 is defined by the programmer prior to including <unistd.h>, the value of _XOPEN_VERSION
is defined as 3, in conformance with XPG3. Otherwise, the value of _XOPEN_VERSION
is defined as 4,in
conformance 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.
Applications that comprise both archived and shared components where
sysconf(_SC_LIBC_VERSION)
may be invoked from both the archived and shared components may
get inconsistent return values from
sysconf().
AUTHOR
sysconf() was developed by HP and POSIX.
CPU_IS_PA_RISC()
was developed by HP.
SEE ALSO
getconf(1), exec(2), fork(2), gethostname(2), getrlimit(2), pathconf(2), times(2), atexit(3), clock(3C),
regcomp(3C), limits(5), stdsyms(5), thread_safety(5), unistd(5).
HP Process Resource Manager: prmconfig(1) in HP Process Resource Manager User’s Guide.
STANDARDS CONFORMANCE
sysconf(): AES, SVID3, XPG3, XPG4, FIPS 151-2, POSIX.1, POSIX.2, POSIX.4
HP-UX 11i Version 2: December 2007 Update − 8 − Hewlett-Packard Company 471