The following diff adds support for sysconf(3) for the variables
_SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN.
Implemented by AIX/Tru64/Solaris/Linux/FreeBSD/NetBSD.
I have run into this being used by 3 programs in ports so far.
Index: lib/libc/shlib_version
===================================================================
RCS file: /cvs/src/lib/libc/shlib_version,v
retrieving revision 1.119
diff -u -p -r1.119 shlib_version
@@ -1,4 +1,4 @@
major=52
-minor=0
+minor=1
# note: If changes were made to include/thread_private.h or if system
# calls were added/changed then libpthread must also be updated.
Index: lib/libc/gen/sysconf.3
===================================================================
RCS file: /cvs/src/lib/libc/gen/sysconf.3,v
retrieving revision 1.25
diff -u -p -r1.25 sysconf.3
--- lib/libc/gen/sysconf.3 25 Jun 2008 17:45:07 -0000 1.25
+++ lib/libc/gen/sysconf.3 14 Nov 2009 23:33:51 -0000
@@ -168,6 +168,10 @@ functions.
The maximum length of a login name.
.It Li _SC_THREAD_SAFE_FUNCTIONS
The level of support for thread-safe (re-entrant) functions.
+.It Li _SC_NPROCESSORS_CONF
+The number of processors configured.
+.It Li _SC_NPROCESSORS_ONLN
+The number of processors online (capable of running processes).
.El
.Sh RETURN VALUES
If the call to
@@ -202,6 +206,11 @@ The
.Fn sysconf
function conforms to
.St -p1003.1-88 .
+The constants
+.Li _SC_NPROCESSORS_CONF
+and
+.Li _SC_NPROCESSORS_ONLN
+are not part of the standard, but are provided by many systems.
.Sh HISTORY
The
.Fn sysconf
Index: lib/libc/gen/sysconf.c
===================================================================
RCS file: /cvs/src/lib/libc/gen/sysconf.c,v
retrieving revision 1.10
diff -u -p -r1.10 sysconf.c
--- lib/libc/gen/sysconf.c 25 Jun 2008 14:54:44 -0000 1.10
+++ lib/libc/gen/sysconf.c 14 Nov 2009 23:22:38 -0000
@@ -238,6 +238,15 @@ yesno: if (sysctl(mib, namelen, &value,
return (vmtotal.t_free);
}
+ case _SC_NPROCESSORS_CONF:
+ mib[0] = CTL_HW;
+ mib[1] = HW_NCPU;
+ break;
+ case _SC_NPROCESSORS_ONLN:
+ mib[0] = CTL_HW;
+ mib[1] = HW_NCPU;
+ break;
+
default:
errno = EINVAL;
return (-1);
Index: sys/sys/unistd.h
===================================================================
RCS file: /cvs/src/sys/sys/unistd.h,v
retrieving revision 1.16
diff -u -p -r1.16 unistd.h
--- sys/sys/unistd.h 22 Aug 2008 14:39:21 -0000 1.16
+++ sys/sys/unistd.h 14 Nov 2009 23:40:36 -0000
@@ -142,6 +142,8 @@
#define _SC_PHYS_PAGES 500
#define _SC_AVPHYS_PAGES 501
+#define _SC_NPROCESSORS_CONF 502
+#define _SC_NPROCESSORS_ONLN 503
/* configurable system strings */
#define _CS_PATH 1
--
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