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/*
* 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) 2014-2018 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include <sched.h>
#include "sched_attr.h"
#include "xlat/schedulers.h"
#include "xlat/sched_flags.h"
SYS_FUNC(sched_getscheduler)
{
if (entering(tcp)) {
tprintf("%d", (int) tcp->u_arg[0]);
} else if (!syserror(tcp)) {
tcp->auxstr = xlookup(schedulers, (kernel_ulong_t) tcp->u_rval);
return RVAL_STR;
}
return 0;
}
SYS_FUNC(sched_setscheduler)
{
tprintf("%d, ", (int) tcp->u_arg[0]);
printxval(schedulers, tcp->u_arg[1], "SCHED_???");
tprints(", ");
printnum_int(tcp, tcp->u_arg[2], "%d");
return RVAL_DECODED;
}
SYS_FUNC(sched_getparam)
{
if (entering(tcp))
tprintf("%d, ", (int) tcp->u_arg[0]);
else
printnum_int(tcp, tcp->u_arg[1], "%d");
return 0;
}
SYS_FUNC(sched_setparam)
{
tprintf("%d, ", (int) tcp->u_arg[0]);
printnum_int(tcp, tcp->u_arg[1], "%d");
return RVAL_DECODED;
}
SYS_FUNC(sched_get_priority_min)
{
printxval(schedulers, tcp->u_arg[0], "SCHED_???");
return RVAL_DECODED;
}
SYS_FUNC(sched_rr_get_interval)
{
if (entering(tcp)) {
tprintf("%d, ", (int) tcp->u_arg[0]);
} else {
if (syserror(tcp))
printaddr(tcp->u_arg[1]);
else
print_timespec(tcp, tcp->u_arg[1]);
}
return 0;
}
static void
print_sched_attr(struct tcb *const tcp, const kernel_ulong_t addr,
unsigned int usize)
{
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)
{
if (entering(tcp)) {
tprintf("%d, ", (int) tcp->u_arg[0]);
print_sched_attr(tcp, tcp->u_arg[1], 0);
} else {
struct sched_attr attr;
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 {
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://lists.strace.io/pipermail/strace-devel/2017-March/006085.html
*/
if (syserror(tcp))
print_abnormal_hi(tcp->u_arg[2]);
#endif
tprintf("%u", size);
tprintf(", %u", (unsigned int) tcp->u_arg[3]);
}
return 0;
}
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