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/*
* Copyright (c) 2015 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2015-2019 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include "xlat/name_to_handle_at_flags.h"
#ifndef MAX_HANDLE_SZ
# define MAX_HANDLE_SZ 128
#endif
typedef struct {
unsigned int handle_bytes;
int handle_type;
} file_handle_header;
SYS_FUNC(name_to_handle_at)
{
file_handle_header h;
const kernel_ulong_t addr = tcp->u_arg[2];
if (entering(tcp)) {
/* dirfd */
print_dirfd(tcp, tcp->u_arg[0]);
tprints(", ");
/* pathname */
printpath(tcp, tcp->u_arg[1]);
tprints(", ");
/* handle */
if (umove_or_printaddr(tcp, addr, &h)) {
tprints(", ");
/* mount_id */
printaddr(tcp->u_arg[3]);
tprints(", ");
/* flags */
printflags(name_to_handle_at_flags, tcp->u_arg[4],
"AT_???");
return RVAL_DECODED;
}
tprint_struct_begin();
PRINT_FIELD_U(h, handle_bytes);
set_tcb_priv_ulong(tcp, h.handle_bytes);
return 0;
} else {
unsigned int i = get_tcb_priv_ulong(tcp);
if ((!syserror(tcp) || EOVERFLOW == tcp->u_error)
&& !umove(tcp, addr, &h)) {
unsigned char f_handle[MAX_HANDLE_SZ];
if (i != h.handle_bytes) {
tprint_value_changed();
tprintf("%u", h.handle_bytes);
}
if (!syserror(tcp)) {
tprint_struct_next();
PRINT_FIELD_D(h, handle_type);
if (h.handle_bytes > MAX_HANDLE_SZ)
h.handle_bytes = MAX_HANDLE_SZ;
if (!umoven(tcp, addr + sizeof(h), h.handle_bytes,
f_handle)) {
tprint_struct_next();
tprints_field_name("f_handle");
tprints("0x");
for (i = 0; i < h.handle_bytes; ++i)
tprintf("%02x", f_handle[i]);
}
}
}
tprint_struct_end();
tprints(", ");
/* mount_id */
printnum_int(tcp, tcp->u_arg[3], "%d");
tprints(", ");
/* flags */
printflags(name_to_handle_at_flags, tcp->u_arg[4], "AT_???");
}
return 0;
}
SYS_FUNC(open_by_handle_at)
{
file_handle_header h;
const kernel_ulong_t addr = tcp->u_arg[1];
/* mount_fd */
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
/* handle */
if (!umove_or_printaddr(tcp, addr, &h)) {
unsigned char f_handle[MAX_HANDLE_SZ];
tprint_struct_begin();
PRINT_FIELD_U(h, handle_bytes);
tprint_struct_next();
PRINT_FIELD_D(h, handle_type);
if (h.handle_bytes > MAX_HANDLE_SZ)
h.handle_bytes = MAX_HANDLE_SZ;
if (!umoven(tcp, addr + sizeof(h), h.handle_bytes, &f_handle)) {
unsigned int i;
tprint_struct_next();
tprints_field_name("f_handle");
tprints("0x");
for (i = 0; i < h.handle_bytes; ++i)
tprintf("%02x", f_handle[i]);
}
tprint_struct_end();
}
tprints(", ");
/* flags */
tprint_open_modes(tcp->u_arg[2]);
return RVAL_DECODED;
}
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