strace/signalfd.c

/*
 * Copyright (c) 2008-2015 Dmitry V. Levin <ldv@altlinux.org>
 * Copyright (c) 2015-2018 The strace developers.
 * All rights reserved.
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 */

#include "defs.h"
#include <fcntl.h>
#ifdef HAVE_SYS_SIGNALFD_H
# include <sys/signalfd.h>
#endif

#include "xlat/sfd_flags.h"

static int
do_signalfd(struct tcb *tcp, int flags_arg)
{
	/* NB: kernel requires arg[2] == NSIG_BYTES */
	printfd(tcp, tcp->u_arg[0]);
	tprints(", ");
	print_sigset_addr_len(tcp, tcp->u_arg[1], tcp->u_arg[2]);
	tprintf(", %" PRI_klu, tcp->u_arg[2]);
	if (flags_arg >= 0) {
		tprints(", ");
		printflags(sfd_flags, tcp->u_arg[flags_arg], "SFD_???");
	}

	return RVAL_DECODED | RVAL_FD;
}

SYS_FUNC(signalfd)
{
	return do_signalfd(tcp, -1);
}

SYS_FUNC(signalfd4)
{
	return do_signalfd(tcp, 3);
}