githubmirror/strace

src/sendfile.c
103 строки2 KB
Dmitry V. Levin
Update copyright headers
15 июн 2026, 11:00
15 июн 2026, 11:00726d2e4
/*
 * Copyright (c) 2015 Dmitry V. Levin <ldv@strace.io>
 * Copyright (c) 2015-2026 The strace developers.
 * All rights reserved.
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 */

#include "defs.h"

SYS_FUNC(sendfile64)
{
	uint64_t offset;

	if (entering(tcp)) {
		/* out_fd */
		tprints_arg_name("out_fd");
		printfd(tcp, tcp->u_arg[0]);

		/* in_fd */
		tprints_arg_next_name("in_fd");
		printfd(tcp, tcp->u_arg[1]);

		/* offset */
		tprints_arg_next_name("offset");
		const int rc = umove_or_printaddr(tcp, tcp->u_arg[2], &offset);
		if (rc || !tcp->u_arg[3]) {
			if (rc == 0) {
				tprint_indirect_begin();
				tprintf_string("%" PRIu64, offset);
				tprint_indirect_end();
			}
			/* count */
			tprints_arg_next_name("count");
			PRINT_VAL_U(tcp->u_arg[3]);
			return RVAL_DECODED;
		}
		tprint_indirect_begin();
		tprintf_string("%" PRIu64, offset);
	} else {
		if (!syserror(tcp) && tcp->u_rval &&
		    umove(tcp, tcp->u_arg[2], &offset) == 0) {
			tprint_value_changed();
			tprintf_string("%" PRIu64, offset);
		}
		tprint_indirect_end();

		/* count */
		tprints_arg_next_name("count");
		PRINT_VAL_U(tcp->u_arg[3]);
	}

	return 0;
}

SYS_FUNC(sendfile)
{
	uint64_t offset;

	if (entering(tcp)) {
		/* out_fd */
		tprints_arg_name("out_fd");
		printfd(tcp, tcp->u_arg[0]);

		/* in_fd */
		tprints_arg_next_name("in_fd");
		printfd(tcp, tcp->u_arg[1]);

		/* offset */
		tprints_arg_next_name("offset");
		const int rc = umoven_to_uint64_or_printaddr(tcp,
							     tcp->u_arg[2],
							     current_wordsize,
							     &offset);
		if (rc || !tcp->u_arg[3]) {
			if (rc == 0) {
				tprint_indirect_begin();
				tprintf_string("%" PRIu64, offset);
				tprint_indirect_end();
			}
			/* count */
			tprints_arg_next_name("count");
			PRINT_VAL_U(tcp->u_arg[3]);
			return RVAL_DECODED;
		}
		tprint_indirect_begin();
		tprintf_string("%" PRIu64, offset);
	} else {
		if (!syserror(tcp) && tcp->u_rval &&
		    tfetch_to_uint64(tcp, tcp->u_arg[2],
				     current_wordsize, &offset)) {
			tprint_value_changed();
			tprintf_string("%" PRIu64, offset);
		}
		tprint_indirect_end();

		/* count */
		tprints_arg_next_name("count");
		PRINT_VAL_U(tcp->u_arg[3]);
	}

	return 0;
}