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/*
* Copyright (c) 2015 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2014-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include "xstring.h"
#include "xlat/ioprio_who.h"
#include "xlat/ioprio_class.h"
#define IOPRIO_CLASS_SHIFT (13)
#define IOPRIO_PRIO_MASK ((1ul << IOPRIO_CLASS_SHIFT) - 1)
#define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
#define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK)
static const char *
sprint_ioprio(unsigned int ioprio)
{
static char outstr[256];
char class_buf[64];
unsigned int class, data;
class = IOPRIO_PRIO_CLASS(ioprio);
data = IOPRIO_PRIO_DATA(ioprio);
sprintxval(class_buf, sizeof(class_buf), ioprio_class, class,
"IOPRIO_CLASS_???");
xsprintf(outstr, "IOPRIO_PRIO_VALUE(%s, %d)", class_buf, data);
return outstr;
}
void
print_ioprio(unsigned int ioprio)
{
if (xlat_verbose(xlat_verbosity) != XLAT_STYLE_ABBREV)
PRINT_VAL_X(ioprio);
if (xlat_verbose(xlat_verbosity) == XLAT_STYLE_RAW)
return;
if (xlat_verbose(xlat_verbosity) == XLAT_STYLE_VERBOSE)
tprint_comment_begin();
unsigned int class = IOPRIO_PRIO_CLASS(ioprio);
unsigned int data = IOPRIO_PRIO_DATA(ioprio);
tprints_arg_begin("IOPRIO_PRIO_VALUE");
printxval_ex(ioprio_class, class,
xlat_verbose(xlat_verbosity) == XLAT_STYLE_VERBOSE
? NULL : "IOPRIO_CLASS_???",
XLAT_STYLE_ABBREV);
tprint_arg_next();
PRINT_VAL_U(data);
tprint_arg_end();
if (xlat_verbose(xlat_verbosity) == XLAT_STYLE_VERBOSE)
tprint_comment_end();
}
static void
ioprio_print_who(struct tcb *tcp, int which, int who)
{
switch (which) {
case IOPRIO_WHO_USER:
printuid(who);
break;
case IOPRIO_WHO_PROCESS:
printpid(tcp, who, PT_TGID);
break;
case IOPRIO_WHO_PGRP:
printpid(tcp, who, PT_PGID);
break;
default:
PRINT_VAL_D(who);
break;
}
}
SYS_FUNC(ioprio_get)
{
if (entering(tcp)) {
/* which */
printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???");
tprint_arg_next();
/* who */
ioprio_print_who(tcp, tcp->u_arg[0], tcp->u_arg[1]);
return 0;
} else {
if (syserror(tcp))
return 0;
if (xlat_verbose(xlat_verbosity) != XLAT_STYLE_RAW)
tcp->auxstr = sprint_ioprio(tcp->u_rval);
return RVAL_STR;
}
}
SYS_FUNC(ioprio_set)
{
/* which */
printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???");
tprint_arg_next();
/* who */
ioprio_print_who(tcp, tcp->u_arg[0], tcp->u_arg[1]);
tprint_arg_next();
/* ioprio */
print_ioprio(tcp->u_arg[2]);
return RVAL_DECODED;
}
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