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aio.c
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aio.c
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/*
* Copyright (c) 1991, 1992 Paul Kranenburg <[email protected]>
* Copyright (c) 1993 Branko Lankester <[email protected]>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <[email protected]>
* Copyright (c) 1996-1999 Wichert Akkerman <[email protected]>
* Copyright (c) 1999-2019 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include "print_fields.h"
#include <linux/aio_abi.h>
#include "xlat/aio_cmds.h"
#ifdef HAVE_STRUCT_IOCB_AIO_FLAGS
# include "xlat/aio_iocb_flags.h"
#endif
#ifdef HAVE_STRUCT_IOCB_AIO_RW_FLAGS
# define AIO_RW_FLAGS_FIELD aio_rw_flags
#else
# define AIO_RW_FLAGS_FIELD aio_reserved1
#endif
SYS_FUNC(io_setup)
{
if (entering(tcp))
tprintf("%u, ", (unsigned int) tcp->u_arg[0]);
else
printnum_ptr(tcp, tcp->u_arg[1]);
return 0;
}
SYS_FUNC(io_destroy)
{
printaddr(tcp->u_arg[0]);
return RVAL_DECODED;
}
enum iocb_sub {
SUB_NONE, SUB_COMMON, SUB_VECTOR, SUB_POLL
};
static enum iocb_sub
tprint_lio_opcode(unsigned int cmd)
{
static const enum iocb_sub subs[] = {
[IOCB_CMD_PREAD] = SUB_COMMON,
[IOCB_CMD_PWRITE] = SUB_COMMON,
[IOCB_CMD_FSYNC] = SUB_NONE,
[IOCB_CMD_FDSYNC] = SUB_NONE,
[IOCB_CMD_PREADX] = SUB_NONE,
[IOCB_CMD_POLL] = SUB_POLL,
[IOCB_CMD_NOOP] = SUB_NONE,
[IOCB_CMD_PREADV] = SUB_VECTOR,
[IOCB_CMD_PWRITEV] = SUB_VECTOR,
};
printxval_ex(aio_cmds, cmd, "IOCB_CMD_???", XLAT_STYLE_FMT_U);
return cmd < ARRAY_SIZE(subs) ? subs[cmd] : SUB_NONE;
}
static void
print_common_flags(struct tcb *tcp, const struct iocb *cb)
{
/* aio_flags and aio_resfd fields are available since v2.6.22-rc1~47 */
#ifdef HAVE_STRUCT_IOCB_AIO_FLAGS
if (cb->aio_flags)
PRINT_FIELD_FLAGS(", ", *cb, aio_flags, aio_iocb_flags,
"IOCB_FLAG_???");
if (cb->aio_flags & IOCB_FLAG_RESFD)
PRINT_FIELD_FD(", ", *cb, aio_resfd, tcp);
else if (cb->aio_resfd)
PRINT_FIELD_X(", ", *cb, aio_resfd);
#endif
}
static bool
iocb_is_valid(const struct iocb *cb)
{
return cb->aio_buf == (unsigned long) cb->aio_buf &&
cb->aio_nbytes == (size_t) cb->aio_nbytes &&
(ssize_t) cb->aio_nbytes >= 0;
}
static enum iocb_sub
print_iocb_header(struct tcb *tcp, const struct iocb *cb)
{
enum iocb_sub sub;
PRINT_FIELD_X("", *cb, aio_data);
if (cb->aio_key)
PRINT_FIELD_U(", ", *cb, aio_key);
if (cb->AIO_RW_FLAGS_FIELD) {
tprints(", aio_rw_flags=");
printflags(rwf_flags, cb->AIO_RW_FLAGS_FIELD, "RWF_???");
}
tprints(", aio_lio_opcode=");
sub = tprint_lio_opcode(cb->aio_lio_opcode);
if (cb->aio_flags & IOCB_FLAG_IOPRIO) {
tprints(", aio_reqprio=");
print_ioprio(zero_extend_signed_to_ull(cb->aio_reqprio));
} else if (cb->aio_reqprio) {
PRINT_FIELD_D(", ", *cb, aio_reqprio);
}
PRINT_FIELD_FD(", ", *cb, aio_fildes, tcp);
return sub;
}
static void
print_iocb(struct tcb *tcp, const struct iocb *cb)
{
tprints("{");
enum iocb_sub sub = print_iocb_header(tcp, cb);
switch (sub) {
case SUB_COMMON:
if (cb->aio_lio_opcode == 1 && iocb_is_valid(cb)) {
PRINT_FIELD_STRN(", ", *cb, aio_buf,
cb->aio_nbytes, tcp);
} else {
PRINT_FIELD_X(", ", *cb, aio_buf);
}
PRINT_FIELD_U(", ", *cb, aio_nbytes);
PRINT_FIELD_D(", ", *cb, aio_offset);
print_common_flags(tcp, cb);
break;
case SUB_VECTOR:
if (iocb_is_valid(cb)) {
tprints(", aio_buf=");
tprint_iov(tcp, cb->aio_nbytes, cb->aio_buf,
cb->aio_lio_opcode == 8
? IOV_DECODE_STR
: IOV_DECODE_ADDR);
} else {
PRINT_FIELD_X(", ", *cb, aio_buf);
PRINT_FIELD_U(", ", *cb, aio_nbytes);
}
PRINT_FIELD_D(", ", *cb, aio_offset);
print_common_flags(tcp, cb);
break;
case SUB_POLL:
PRINT_FIELD_FLAGS(", ", *cb, aio_buf, pollflags, "POLL???");
print_common_flags(tcp, cb);
break;
case SUB_NONE:
break;
}
tprints("}");
}
static bool
print_iocbp(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
{
kernel_ulong_t addr;
struct iocb cb;
if (elem_size < sizeof(kernel_ulong_t)) {
addr = *(unsigned int *) elem_buf;
} else {
addr = *(kernel_ulong_t *) elem_buf;
}
if (!umove_or_printaddr(tcp, addr, &cb))
print_iocb(tcp, &cb);
return true;
}
SYS_FUNC(io_submit)
{
const kernel_long_t nr =
truncate_klong_to_current_wordsize(tcp->u_arg[1]);
const kernel_ulong_t addr = tcp->u_arg[2];
kernel_ulong_t iocbp;
printaddr(tcp->u_arg[0]);
tprintf(", %" PRI_kld ", ", nr);
if (nr < 0)
printaddr(addr);
else
print_array(tcp, addr, nr, &iocbp, current_wordsize,
tfetch_mem, print_iocbp, 0);
return RVAL_DECODED;
}
static bool
print_io_event(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
{
struct io_event *event = elem_buf;
PRINT_FIELD_X("{", *event, data);
PRINT_FIELD_X(", ", *event, obj);
PRINT_FIELD_D(", ", *event, res);
PRINT_FIELD_D(", ", *event, res2);
tprints("}");
return true;
}
SYS_FUNC(io_cancel)
{
if (entering(tcp)) {
printaddr(tcp->u_arg[0]);
tprints(", ");
struct iocb cb;
if (!umove_or_printaddr(tcp, tcp->u_arg[1], &cb)) {
tprints("{");
print_iocb_header(tcp, &cb);
tprints("}");
}
tprints(", ");
} else {
struct io_event event;
if (!umove_or_printaddr(tcp, tcp->u_arg[2], &event))
print_io_event(tcp, &event, sizeof(event), 0);
}
return 0;
}
static int
print_io_getevents(struct tcb *const tcp, const print_obj_by_addr_fn print_ts,
const bool has_usig)
{
if (entering(tcp)) {
printaddr(tcp->u_arg[0]);
tprintf(", %" PRI_kld ", %" PRI_kld ", ",
truncate_klong_to_current_wordsize(tcp->u_arg[1]),
truncate_klong_to_current_wordsize(tcp->u_arg[2]));
} else {
struct io_event buf;
print_array(tcp, tcp->u_arg[3], tcp->u_rval, &buf, sizeof(buf),
tfetch_mem, print_io_event, 0);
tprints(", ");
/*
* Since the timeout and usig parameters are read by the kernel
* on entering syscall, it has to be decoded the same way
* whether the syscall has failed or not.
*/
temporarily_clear_syserror(tcp);
print_ts(tcp, tcp->u_arg[4]);
if (has_usig) {
tprints(", ");
print_aio_sigset(tcp, tcp->u_arg[5]);
}
restore_cleared_syserror(tcp);
}
return 0;
}
#if HAVE_ARCH_TIME32_SYSCALLS
SYS_FUNC(io_getevents_time32)
{
return print_io_getevents(tcp, print_timespec32, false);
}
#endif
#if HAVE_ARCH_OLD_TIME64_SYSCALLS
SYS_FUNC(io_getevents_time64)
{
return print_io_getevents(tcp, print_timespec64, false);
}
#endif
#if HAVE_ARCH_TIME32_SYSCALLS
SYS_FUNC(io_pgetevents_time32)
{
return print_io_getevents(tcp, print_timespec32, true);
}
#endif
SYS_FUNC(io_pgetevents_time64)
{
return print_io_getevents(tcp, print_timespec64, true);
}