ipc_sem.c

/*
 * Copyright (c) 1993 Ulrich Pegelow <pegelow@moorea.uni-muenster.de>
 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
 * Copyright (c) 2003-2006 Roland McGrath <roland@redhat.com>
 * Copyright (c) 2006-2015 Dmitry V. Levin <ldv@altlinux.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "defs.h"
#include "ipc_defs.h"

#ifdef HAVE_SYS_SEM_H
# include <sys/sem.h>
#elif defined HAVE_LINUX_SEM_H
# include <linux/sem.h>
#endif

#include "xlat/semctl_flags.h"
#include "xlat/semop_flags.h"

#if defined HAVE_SYS_SEM_H || defined HAVE_LINUX_SEM_H
static void
tprint_sembuf(const struct sembuf *sb)
{
	tprintf("{%u, %d, ", sb->sem_num, sb->sem_op);
	printflags(semop_flags, sb->sem_flg, "SEM_???");
	tprints("}");
}
#endif

static void
tprint_sembuf_array(struct tcb *tcp, const long addr, const unsigned long count)
{
#if defined HAVE_SYS_SEM_H || defined HAVE_LINUX_SEM_H
	unsigned long max_count;
	struct sembuf sb;

	if (abbrev(tcp))
		max_count = (max_strlen < count) ? max_strlen : count;
	else
		max_count = count;

	if (!max_count)
		printaddr(addr);
	else if (!umove_or_printaddr(tcp, addr, &sb)) {
		unsigned long i;

		tprints("[");
		tprint_sembuf(&sb);

		for (i = 1; i < max_count; ++i) {
			tprints(", ");
			if (umove_or_printaddr(tcp, addr + i * sizeof(sb), &sb))
				break;
			else
				tprint_sembuf(&sb);
		}

		if (i < max_count || max_count < count)
			tprints(", ...");

		tprints("]");
	}
#else
	printaddr(addr);
#endif
	tprintf(", %lu", count);
}

SYS_FUNC(semop)
{
	tprintf("%lu, ", tcp->u_arg[0]);
	if (indirect_ipccall(tcp)) {
		tprint_sembuf_array(tcp, tcp->u_arg[3], tcp->u_arg[1]);
	} else {
		tprint_sembuf_array(tcp, tcp->u_arg[1], tcp->u_arg[2]);
	}
	return RVAL_DECODED;
}

SYS_FUNC(semtimedop)
{
	tprintf("%lu, ", tcp->u_arg[0]);
	if (indirect_ipccall(tcp)) {
		tprint_sembuf_array(tcp, tcp->u_arg[3], tcp->u_arg[1]);
		tprints(", ");
#if defined(S390) || defined(S390X)
		print_timespec(tcp, tcp->u_arg[2]);
#else
		print_timespec(tcp, tcp->u_arg[4]);
#endif
	} else {
		tprint_sembuf_array(tcp, tcp->u_arg[1], tcp->u_arg[2]);
		tprints(", ");
		print_timespec(tcp, tcp->u_arg[3]);
	}
	return RVAL_DECODED;
}

SYS_FUNC(semget)
{
	if (tcp->u_arg[0])
		tprintf("%#lx", tcp->u_arg[0]);
	else
		tprints("IPC_PRIVATE");
	tprintf(", %lu, ", tcp->u_arg[1]);
	if (printflags(resource_flags, tcp->u_arg[2] & ~0777, NULL) != 0)
		tprints("|");
	tprintf("%#lo", tcp->u_arg[2] & 0777);
	return RVAL_DECODED;
}

SYS_FUNC(semctl)
{
	tprintf("%lu, %lu, ", tcp->u_arg[0], tcp->u_arg[1]);
	PRINTCTL(semctl_flags, tcp->u_arg[2], "SEM_???");
	tprints(", ");
	if (indirect_ipccall(tcp)) {
		printnum_ptr(tcp, tcp->u_arg[3]);
	} else {
		tprintf("%#lx", tcp->u_arg[3]);
	}
	return RVAL_DECODED;
}