diff options
Diffstat (limited to 'lib/libc/gen/sysconf.c')
| -rw-r--r-- | lib/libc/gen/sysconf.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/lib/libc/gen/sysconf.c b/lib/libc/gen/sysconf.c index b5b732eed05d..87aedc07c110 100644 --- a/lib/libc/gen/sysconf.c +++ b/lib/libc/gen/sysconf.c @@ -72,6 +72,7 @@ long sysconf(int name) { struct rlimit rl; + cpuset_t cpus; size_t len; int mib[2], sverrno, value; long lvalue, defaultresult; @@ -581,8 +582,21 @@ yesno: return (_POSIX_IPV6); #endif - case _SC_NPROCESSORS_CONF: case _SC_NPROCESSORS_ONLN: + /* + * Consult our root set first, because our CPU availability + * may not match the total number of CPUs available on the + * system and we may have a non-uniform layout even within + * userland. In particular, each jail has a root set that can + * be constrained by its parent and processes within the jail + * cannot widen beyond those constraints, so to those processes + * it makes sense to claim the more limited count. + */ + if (cpuset_getaffinity(CPU_LEVEL_ROOT, CPU_WHICH_PID, -1, + sizeof(cpus), &cpus) == 0) + return (CPU_COUNT(&cpus)); + /* FALLTHROUGH */ + case _SC_NPROCESSORS_CONF: if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0) return ((long)value); mib[0] = CTL_HW; |