* Copyright (c) 2004 Ulrich Drepper <drepper@redhat.com>
* Copyright (c) 2005 Roland McGrath <roland@redhat.com>
* Copyright (c) 2012-2015 Dmitry V. Levin <ldv@altlinux.org>
+ * Copyright (c) 2014-2017 The strace developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#include "defs.h"
#include <sched.h>
+#include "sched_attr.h"
#include "xlat/schedulers.h"
#include "xlat/sched_flags.h"
static void
print_sched_attr(struct tcb *const tcp, const kernel_ulong_t addr,
- unsigned int size)
+ unsigned int usize)
{
- struct {
- uint32_t size;
- uint32_t sched_policy;
- uint64_t sched_flags;
- uint32_t sched_nice;
- uint32_t sched_priority;
- uint64_t sched_runtime;
- uint64_t sched_deadline;
- uint64_t sched_period;
- } attr = {};
-
- if (size > sizeof(attr))
- size = sizeof(attr);
- if (umoven_or_printaddr(tcp, addr, size, &attr))
- return;
-
- tprintf("{size=%u, sched_policy=", attr.size);
- printxval(schedulers, attr.sched_policy, "SCHED_???");
- tprints(", sched_flags=");
- printflags64(sched_flags, attr.sched_flags, "SCHED_FLAG_???");
- tprintf(", sched_nice=%d", attr.sched_nice);
- tprintf(", sched_priority=%u", attr.sched_priority);
- tprintf(", sched_runtime=%" PRIu64, attr.sched_runtime);
- tprintf(", sched_deadline=%" PRIu64, attr.sched_deadline);
- tprintf(", sched_period=%" PRIu64 "}", attr.sched_period);
+ struct sched_attr attr = {};
+ unsigned int size;
+
+ if (usize) {
+ /* called from sched_getattr */
+ size = usize <= sizeof(attr) ? usize : (unsigned) sizeof(attr);
+ if (umoven_or_printaddr(tcp, addr, size, &attr))
+ return;
+ /* the number of bytes written by the kernel */
+ size = attr.size;
+ } else {
+ /* called from sched_setattr */
+ if (umove_or_printaddr(tcp, addr, &attr.size))
+ return;
+ usize = attr.size;
+ if (!usize)
+ usize = SCHED_ATTR_MIN_SIZE;
+ size = usize <= sizeof(attr) ? usize : (unsigned) sizeof(attr);
+ if (size >= SCHED_ATTR_MIN_SIZE) {
+ if (umoven_or_printaddr(tcp, addr, size, &attr))
+ return;
+ }
+ }
+
+ tprintf("{size=%u", attr.size);
+
+ if (size >= SCHED_ATTR_MIN_SIZE) {
+ tprints(", sched_policy=");
+ printxval(schedulers, attr.sched_policy, "SCHED_???");
+ tprints(", sched_flags=");
+ printflags64(sched_flags, attr.sched_flags, "SCHED_FLAG_???");
+
+#define PRINT_SCHED_FIELD(field, fmt) \
+ tprintf(", " #field "=%" fmt, attr.field)
+
+ PRINT_SCHED_FIELD(sched_nice, "d");
+ PRINT_SCHED_FIELD(sched_priority, "u");
+ PRINT_SCHED_FIELD(sched_runtime, PRIu64);
+ PRINT_SCHED_FIELD(sched_deadline, PRIu64);
+ PRINT_SCHED_FIELD(sched_period, PRIu64);
+
+ if (usize > size)
+ tprints(", ...");
+ }
+
+ tprints("}");
}
SYS_FUNC(sched_setattr)
{
- tprintf("%d, ", (int) tcp->u_arg[0]);
- print_sched_attr(tcp, tcp->u_arg[1], 0x100);
- tprintf(", %u", (unsigned int) tcp->u_arg[2]);
+ if (entering(tcp)) {
+ tprintf("%d, ", (int) tcp->u_arg[0]);
+ print_sched_attr(tcp, tcp->u_arg[1], 0);
+ } else {
+ struct sched_attr attr;
- return RVAL_DECODED;
+ if (verbose(tcp) && tcp->u_error == E2BIG
+ && umove(tcp, tcp->u_arg[1], &attr.size) == 0) {
+ tprintf(" => {size=%u}", attr.size);
+ }
+
+ tprintf(", %u", (unsigned int) tcp->u_arg[2]);
+ }
+
+ return 0;
}
SYS_FUNC(sched_getattr)
if (entering(tcp)) {
tprintf("%d, ", (int) tcp->u_arg[0]);
} else {
- print_sched_attr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
- tprintf(", %u, %u",
- (unsigned int) tcp->u_arg[2],
- (unsigned int) tcp->u_arg[3]);
+ const unsigned int size = tcp->u_arg[2];
+
+ if (size)
+ print_sched_attr(tcp, tcp->u_arg[1], size);
+ else
+ printaddr(tcp->u_arg[1]);
+ tprints(", ");
+#ifdef AARCH64
+ /*
+ * Due to a subtle gcc bug that leads to miscompiled aarch64
+ * kernels, the 3rd argument of sched_getattr is not quite 32-bit
+ * as on other architectures. For more details see
+ * https://sourceforge.net/p/strace/mailman/message/35721703/
+ */
+ if (syserror(tcp))
+ print_abnormal_hi(tcp->u_arg[2]);
+#endif
+ tprintf("%u", size);
+ tprintf(", %u", (unsigned int) tcp->u_arg[3]);
}
return 0;