+/*
+ * Copyright (c) 2002-2004 Roland McGrath <roland@redhat.com>
+ * Copyright (c) 2009-2016 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
#include "defs.h"
+#include <sched.h>
+
+static unsigned int
+get_cpuset_size(void)
+{
+ static unsigned int cpuset_size;
+
+ if (!cpuset_size) {
+ /*
+ * If the cpuset size passed to sched_getaffinity is less
+ * than necessary to store the bitmask, the kernel does not
+ * look at the mask pointer and fails with EINVAL.
+ *
+ * If the cpuset size is large enough, the kernel fails with
+ * EFAULT on inaccessible mask pointers.
+ *
+ * This undocumented kernel feature can be used to probe
+ * the kernel and find out the minimal valid cpuset size
+ * without allocating any memory for the CPU affinity mask.
+ */
+ cpuset_size = 128;
+ while (cpuset_size &&
+ sched_getaffinity(0, cpuset_size, NULL) == -1 &&
+ EINVAL == errno) {
+ cpuset_size <<= 1;
+ }
+ if (!cpuset_size)
+ cpuset_size = 128;
+ }
+
+ return cpuset_size;
+}
static void
-print_affinitylist(struct tcb *tcp, long list, unsigned int len)
+print_affinitylist(struct tcb *const tcp, const kernel_ulong_t addr,
+ const unsigned int len)
{
- int first = 1;
- unsigned long w, min_len;
-
- if (abbrev(tcp) && len / sizeof(w) > max_strlen)
- min_len = len - max_strlen * sizeof(w);
- else
- min_len = 0;
- for (; len >= sizeof(w) && len > min_len;
- len -= sizeof(w), list += sizeof(w)) {
- if (umove(tcp, list, &w) < 0)
- break;
- if (first)
- tprints("{");
- else
- tprints(", ");
- first = 0;
- tprintf("%lx", w);
+ const unsigned int max_size = get_cpuset_size();
+ const unsigned int umove_size = len < max_size ? len : max_size;
+ const unsigned int size =
+ (umove_size + current_wordsize - 1) & -current_wordsize;
+ const unsigned int ncpu = size * 8;
+ void *cpu;
+
+ if (!verbose(tcp) || (exiting(tcp) && syserror(tcp)) ||
+ !addr || !len || !(cpu = calloc(size, 1))) {
+ printaddr(addr);
+ return;
}
- if (len) {
- if (first)
- tprintf("%#lx", list);
- else
- tprintf(", %s}", (len >= sizeof(w) && len > min_len ?
- "???" : "..."));
- } else {
- tprints(first ? "{}" : "}");
+
+ if (!umoven_or_printaddr(tcp, addr, umove_size, cpu)) {
+ int i = 0;
+ const char *sep = "";
+
+ tprints("[");
+ for (;; i++) {
+ i = next_set_bit(cpu, i, ncpu);
+ if (i < 0)
+ break;
+ tprintf("%s%d", sep, i);
+ sep = ", ";
+ }
+ if (size < len)
+ tprintf("%s...", sep);
+ tprints("]");
}
+
+ free(cpu);
}
SYS_FUNC(sched_setaffinity)
{
- if (entering(tcp)) {
- tprintf("%ld, %lu, ", tcp->u_arg[0], tcp->u_arg[1]);
- print_affinitylist(tcp, tcp->u_arg[2], tcp->u_arg[1]);
- }
- return 0;
+ const int pid = tcp->u_arg[0];
+ const unsigned int len = tcp->u_arg[1];
+
+ tprintf("%d, %u, ", pid, len);
+ print_affinitylist(tcp, tcp->u_arg[2], len);
+
+ return RVAL_DECODED;
}
SYS_FUNC(sched_getaffinity)
{
+ const int pid = tcp->u_arg[0];
+ const unsigned int len = tcp->u_arg[1];
+
if (entering(tcp)) {
- tprintf("%ld, %lu, ", tcp->u_arg[0], tcp->u_arg[1]);
+ tprintf("%d, %u, ", pid, len);
} else {
- if (tcp->u_rval == -1)
- tprintf("%#lx", tcp->u_arg[2]);
- else
- print_affinitylist(tcp, tcp->u_arg[2], tcp->u_rval);
+ print_affinitylist(tcp, tcp->u_arg[2], tcp->u_rval);
}
return 0;
}