diff options
Diffstat (limited to 'plpa-1.3.2/src/libplpa/plpa_api_probe.c')
-rw-r--r-- | plpa-1.3.2/src/libplpa/plpa_api_probe.c | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/plpa-1.3.2/src/libplpa/plpa_api_probe.c b/plpa-1.3.2/src/libplpa/plpa_api_probe.c deleted file mode 100644 index 5f059c32..00000000 --- a/plpa-1.3.2/src/libplpa/plpa_api_probe.c +++ /dev/null @@ -1,107 +0,0 @@ -/* -*- c -*- - * - * Copyright (c) 2004-2005 The Trustees of Indiana University. - * All rights reserved. - * Copyright (c) 2004-2005 The Regents of the University of California. - * All rights reserved. - * Copyright (c) 2007-2008 Cisco, Inc. All rights reserved. - * $COPYRIGHT$ - * - * Additional copyrights may follow - * - * $HEADER$ - */ - -#include "plpa_config.h" -#include "plpa.h" -#include "plpa_internal.h" - -#include <errno.h> -#include <sys/syscall.h> -#include <unistd.h> - -#if PLPA_WANT_VALGRIND_SUPPORT -#include "valgrind/memcheck.h" -#endif - -/* Cache, just to make things a little more efficient */ -static PLPA_NAME(api_type_t) cache = PLPA_NAME_CAPS(PROBE_UNSET); - -/* The len value we find - not in public header, but used by the lib */ -size_t PLPA_NAME(len) = 0; - -int PLPA_NAME(api_probe_init)(void) -{ - PLPA_NAME(cpu_set_t) mask; - int rc; - size_t len; - - for (len = sizeof(mask); len != 0; len >>= 1) { - rc = syscall(__NR_sched_getaffinity, 0, len, &mask); - if (rc >= 0) { - /* OK, kernel is happy with a get(). Validate w/ a set(). */ - /* Note that kernel may have told us the "proper" size */ - size_t tmp = (0 != rc) ? ((size_t) rc) : len; - /* Pass mask=NULL, expect errno==EFAULT if tmp was OK - as a length */ -#if PLPA_WANT_VALGRIND_SUPPORT - /* Lie to Valgrind and say that this memory is addressible - so that we don't get a false positive here -- we *know* - that 0 is unaddressible; that's the whole point of this - test (to see what error NR_sched_set_affinity will - return). So let's not see a warning from Valgrind from - something that we know is wrong. :-) */ - VALGRIND_MAKE_MEM_DEFINED(0, len); -#endif - rc = syscall(__NR_sched_setaffinity, 0, tmp, NULL); -#if PLPA_WANT_VALGRIND_SUPPORT - VALGRIND_MAKE_MEM_UNDEFINED(0, len); - VALGRIND_MAKE_MEM_NOACCESS(0, len); -#endif - if ((rc < 0) && (errno == EFAULT)) { - cache = PLPA_NAME_CAPS(PROBE_OK); - PLPA_NAME(len) = tmp; - rc = 0; - break; - } - } - if (errno == ENOSYS) { - break; /* No point in looping */ - } - } - - if (rc >= 0) { - /* OK */ - } else if (errno == ENOSYS) { - /* Kernel returns ENOSYS because there is no support for - processor affinity */ - cache = PLPA_NAME_CAPS(PROBE_NOT_SUPPORTED); - } else { - /* Unknown! */ - cache = PLPA_NAME_CAPS(PROBE_UNKNOWN); - } - - return 0; -} - - -int PLPA_NAME(api_probe)(PLPA_NAME(api_type_t) *api_type) -{ - int ret; - - /* Check to see that we're initialized */ - if (!PLPA_NAME(initialized)) { - if (0 != (ret = PLPA_NAME(init)())) { - return ret; - } - } - - /* Check for bozo arguments */ - if (NULL == api_type) { - return EINVAL; - } - - /* All done */ - *api_type = cache; - return 0; -} |