ipc.c - platform/external/strace - Gitiles

 /*
  * 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>
  * 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.
  *
  *	$Id$
  */

 #include "defs.h"

 #if defined(LINUX) || defined(SUNOS4) || defined(FREEBSD)

 # ifdef HAVE_MQUEUE_H
 #  include <mqueue.h>
 # endif

 #include <fcntl.h>
 #include <sys/ipc.h>
 #include <sys/sem.h>
 #include <sys/msg.h>
 #include <sys/shm.h>

 #ifndef MSG_STAT
 #define MSG_STAT 11
 #endif
 #ifndef MSG_INFO
 #define MSG_INFO 12
 #endif
 #ifndef SHM_STAT
 #define SHM_STAT 13
 #endif
 #ifndef SHM_INFO
 #define SHM_INFO 14
 #endif
 #ifndef SEM_STAT
 #define SEM_STAT 18
 #endif
 #ifndef SEM_INFO
 #define SEM_INFO 19
 #endif

 #if defined LINUX && !defined IPC_64
 # define IPC_64 0x100
 #endif

 extern void printsigevent(struct tcb *tcp, long arg);

 static const struct xlat msgctl_flags[] = {
 	{ IPC_RMID,	"IPC_RMID"	},
 	{ IPC_SET,	"IPC_SET"	},
 	{ IPC_STAT,	"IPC_STAT"	},
 #ifdef LINUX
 	{ IPC_INFO,	"IPC_INFO"	},
 	{ MSG_STAT,	"MSG_STAT"	},
 	{ MSG_INFO,	"MSG_INFO"	},
 #endif /* LINUX */
 	{ 0,		NULL		},
 };

 static const struct xlat semctl_flags[] = {
 	{ IPC_RMID,	"IPC_RMID"	},
 	{ IPC_SET,	"IPC_SET"	},
 	{ IPC_STAT,	"IPC_STAT"	},
 #ifdef LINUX
 	{ IPC_INFO,	"IPC_INFO"	},
 	{ SEM_STAT,	"SEM_STAT"	},
 	{ SEM_INFO,	"SEM_INFO"	},
 #endif /* LINUX */
 	{ GETPID,	"GETPID"	},
 	{ GETVAL,	"GETVAL"	},
 	{ GETALL,	"GETALL"	},
 	{ GETNCNT,	"GETNCNT"	},
 	{ GETZCNT,	"GETZCNT"	},
 	{ SETVAL,	"SETVAL"	},
 	{ SETALL,	"SETALL"	},
 	{ 0,		NULL		},
 };

 static const struct xlat shmctl_flags[] = {
 	{ IPC_RMID,	"IPC_RMID"	},
 	{ IPC_SET,	"IPC_SET"	},
 	{ IPC_STAT,	"IPC_STAT"	},
 #ifdef LINUX
 	{ IPC_INFO,	"IPC_INFO"	},
 	{ SHM_STAT,	"SHM_STAT"	},
 	{ SHM_INFO,	"SHM_INFO"	},
 #endif /* LINUX */
 #ifdef SHM_LOCK
 	{ SHM_LOCK,	"SHM_LOCK"	},
 #endif
 #ifdef SHM_UNLOCK
 	{ SHM_UNLOCK,	"SHM_UNLOCK"	},
 #endif
 	{ 0,		NULL		},
 };

 static const struct xlat resource_flags[] = {
 	{ IPC_CREAT,	"IPC_CREAT"	},
 	{ IPC_EXCL,	"IPC_EXCL"	},
 	{ IPC_NOWAIT,	"IPC_NOWAIT"	},
 	{ 0,		NULL		},
 };

 static const struct xlat shm_resource_flags[] = {
 	{ IPC_CREAT,	"IPC_CREAT"	},
 	{ IPC_EXCL,	"IPC_EXCL"	},
 #ifdef SHM_HUGETLB
 	{ SHM_HUGETLB,	"SHM_HUGETLB"	},
 #endif
 	{ 0,		NULL		},
 };

 static const struct xlat shm_flags[] = {
 #ifdef LINUX
 	{ SHM_REMAP,	"SHM_REMAP"	},
 #endif /* LINUX */
 	{ SHM_RDONLY,	"SHM_RDONLY"	},
 	{ SHM_RND,	"SHM_RND"	},
 	{ 0,		NULL		},
 };

 static const struct xlat msg_flags[] = {
 	{ MSG_NOERROR,	"MSG_NOERROR"	},
 #ifdef LINUX
 	{ MSG_EXCEPT,	"MSG_EXCEPT"	},
 #endif /* LINUX */
 	{ IPC_NOWAIT,	"IPC_NOWAIT"	},
 	{ 0,		NULL		},
 };

 static const struct xlat semop_flags[] = {
 	{ SEM_UNDO,	"SEM_UNDO"	},
 	{ IPC_NOWAIT,	"IPC_NOWAIT"	},
 	{ 0,		NULL		},
 };

 int sys_msgget(tcp)
 struct tcb *tcp;
 {
 	if (entering(tcp)) {
 		if (tcp->u_arg[0])
 			tprintf("%#lx", tcp->u_arg[0]);
 		else
 			tprintf("IPC_PRIVATE");
 		tprintf(", ");
 		if (printflags(resource_flags, tcp->u_arg[1] & ~0777, NULL) != 0)
 			tprintf("|");
 		tprintf("%#lo", tcp->u_arg[1] & 0777);
 	}
 	return 0;
 }

 #ifdef IPC_64
 # define PRINTCTL(flagset, arg, dflt) \
 	if ((arg) & IPC_64) tprintf("IPC_64|"); \
 	printxval((flagset), (arg) &~ IPC_64, dflt)
 #else
 # define PRINTCTL printxval
 #endif

 static int
 indirect_ipccall(tcp)
 struct tcb *tcp;
 {
 #ifdef LINUX
 #ifdef X86_64
 	return current_personality > 0;
 #endif
 #if defined IA64
 	return tcp->scno < 1024; /* ia32 emulation syscalls are low */
 #endif
 #if !defined MIPS && !defined HPPA
 	return 1;
 #endif
 #endif	/* LINUX */
 	return 0;
 }

 int sys_msgctl(tcp)
 struct tcb *tcp;
 {
 	if (entering(tcp)) {
 		tprintf("%lu, ", tcp->u_arg[0]);
 		PRINTCTL(msgctl_flags, tcp->u_arg[1], "MSG_???");
 		tprintf(", %#lx", tcp->u_arg[indirect_ipccall(tcp) ? 3 : 2]);
 	}
 	return 0;
 }

 static void
 tprint_msgsnd(struct tcb *tcp, long addr, unsigned long count)
 {
 	long mtype;

 	if (umove(tcp, addr, &mtype) < 0) {
 		tprintf("%#lx", addr);
 	} else {
 		tprintf("{%lu, ", mtype);
 		printstr(tcp, addr + sizeof(mtype), count);
 		tprintf("}");
 	}
 	tprintf(", %lu, ", count);
 	printflags(msg_flags, tcp->u_arg[3], "MSG_???");
 }

 int sys_msgsnd(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%lu, ", tcp->u_arg[0]);
 		if (indirect_ipccall(tcp)) {
 			tprint_msgsnd(tcp, tcp->u_arg[3], tcp->u_arg[1]);
 		} else {
 			tprint_msgsnd(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 		}
 	}
 	return 0;
 }

 int sys_msgrcv(tcp)
 struct tcb *tcp;
 {
 	long mtype;

 	if (entering(tcp)) {
 		tprintf("%lu, ", tcp->u_arg[0]);
 	} else {
 		tprintf("%lu", tcp->u_arg[0]);
 		if (indirect_ipccall(tcp)) {
 			struct ipc_wrapper {
 				struct msgbuf *msgp;
 				long msgtyp;
 			} tmp;
 			umove(tcp, tcp->u_arg[3], &tmp);
 			umove(tcp, (long) tmp.msgp, &mtype);
 			tprintf(", {%lu, ", mtype);
 			printstr(tcp, (long) (tmp.msgp) + sizeof(long),
 				 tcp->u_arg[1]);
 			tprintf("}, %lu", tcp->u_arg[1]);
 			tprintf(", %ld", tmp.msgtyp);
 			tprintf(", ");
 			printflags(msg_flags, tcp->u_arg[2], "MSG_???");
 		} else {
 			umove(tcp, tcp->u_arg[1], &mtype);
 			tprintf("{%lu, ", mtype);
 			printstr(tcp, tcp->u_arg[1] + sizeof(long),
 				 tcp->u_arg[2]);
 			tprintf("}, %lu", tcp->u_arg[2]);
 			tprintf(", %ld", tcp->u_arg[3]);
 			tprintf(", ");
 			printflags(msg_flags, tcp->u_arg[4], "MSG_???");
 		}
 	}
 	return 0;
 }

 static void
 tprint_sembuf(struct tcb *tcp, long addr, unsigned long count)
 {
 	unsigned long i, max_count;

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

 	if (!max_count) {
 		tprintf("%#lx, %lu", addr, count);
 		return;
 	}

 	for(i = 0; i < max_count; ++i) {
 		struct sembuf sb;
 		if (i)
 			tprintf(", ");
 		if (umove(tcp, addr + i * sizeof(struct sembuf), &sb) < 0) {
 			if (i) {
 				tprintf("{???}");
 				break;
 			} else {
 				tprintf("%#lx, %lu", addr, count);
 				return;
 			}
 		} else {
 			if (!i)
 				tprintf("{");
 			tprintf("{%u, %d, ", sb.sem_num, sb.sem_op);
 			printflags(semop_flags, sb.sem_flg, "SEM_???");
 			tprintf("}");
 		}
 	}

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

 	tprintf("}, %lu", count);
 }

 int sys_semop(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%lu, ", tcp->u_arg[0]);
 		if (indirect_ipccall(tcp)) {
 			tprint_sembuf(tcp, tcp->u_arg[3], tcp->u_arg[1]);
 		} else {
 			tprint_sembuf(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 		}
 	}
 	return 0;
 }

 #ifdef LINUX
 int sys_semtimedop(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%lu, ", tcp->u_arg[0]);
 		if (indirect_ipccall(tcp)) {
 			tprint_sembuf(tcp, tcp->u_arg[3], tcp->u_arg[1]);
 			tprintf(", ");
 			printtv(tcp, tcp->u_arg[5]);
 		} else {
 			tprint_sembuf(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 			tprintf(", ");
 			printtv(tcp, tcp->u_arg[3]);
 		}
 	}
 	return 0;
 }
 #endif

 int sys_semget(tcp)
 struct tcb *tcp;
 {
 	if (entering(tcp)) {
 		if (tcp->u_arg[0])
 			tprintf("%#lx", tcp->u_arg[0]);
 		else
 			tprintf("IPC_PRIVATE");
 		tprintf(", %lu", tcp->u_arg[1]);
 		tprintf(", ");
 		if (printflags(resource_flags, tcp->u_arg[2] & ~0777, NULL) != 0)
 			tprintf("|");
 		tprintf("%#lo", tcp->u_arg[2] & 0777);
 	}
 	return 0;
 }

 int sys_semctl(tcp)
 struct tcb *tcp;
 {
 	if (entering(tcp)) {
 		tprintf("%lu", tcp->u_arg[0]);
 		tprintf(", %lu, ", tcp->u_arg[1]);
 		PRINTCTL(semctl_flags, tcp->u_arg[2], "SEM_???");
 		tprintf(", %#lx", tcp->u_arg[3]);
 	}
 	return 0;
 }

 int sys_shmget(tcp)
 struct tcb *tcp;
 {
 	if (entering(tcp)) {
 		if (tcp->u_arg[0])
 			tprintf("%#lx", tcp->u_arg[0]);
 		else
 			tprintf("IPC_PRIVATE");
 		tprintf(", %lu", tcp->u_arg[1]);
 		tprintf(", ");
 		if (printflags(shm_resource_flags, tcp->u_arg[2] & ~0777, NULL) != 0)
 			tprintf("|");
 		tprintf("%#lo", tcp->u_arg[2] & 0777);
 	}
 	return 0;
 }

 int sys_shmctl(tcp)
 struct tcb *tcp;
 {
 	if (entering(tcp)) {
 		tprintf("%lu, ", tcp->u_arg[0]);
 		PRINTCTL(shmctl_flags, tcp->u_arg[1], "SHM_???");
 		if (indirect_ipccall(tcp)) {
 			tprintf(", %#lx", tcp->u_arg[3]);
 		} else {
 			tprintf(", %#lx", tcp->u_arg[2]);
 		}
 	}
 	return 0;
 }

 int sys_shmat(tcp)
 struct tcb *tcp;
 {
 #ifdef LINUX
 	unsigned long raddr;
 #endif /* LINUX */

 	if (exiting(tcp)) {
 		tprintf("%lu", tcp->u_arg[0]);
 		if (indirect_ipccall(tcp)) {
 			tprintf(", %#lx", tcp->u_arg[3]);
 			tprintf(", ");
 			printflags(shm_flags, tcp->u_arg[1], "SHM_???");
 		} else {
 			tprintf(", %#lx", tcp->u_arg[1]);
 			tprintf(", ");
 			printflags(shm_flags, tcp->u_arg[2], "SHM_???");
 		}
 		if (syserror(tcp))
 			return 0;
 /* HPPA does not use an IPC multiplexer on Linux.  */
 #if defined(LINUX) && !defined(HPPA)
 		if (umove(tcp, tcp->u_arg[2], &raddr) < 0)
 			return RVAL_NONE;
 		tcp->u_rval = raddr;
 #endif /* LINUX */
 		return RVAL_HEX;
 	}
 	return 0;
 }

 int sys_shmdt(tcp)
 struct tcb *tcp;
 {
 	if (entering(tcp)) {
 		if (indirect_ipccall(tcp)) {
 			tprintf("%#lx", tcp->u_arg[3]);
 		} else {
 			tprintf("%#lx", tcp->u_arg[0]);
 		}
 	}
 	return 0;
 }

 #endif /* defined(LINUX) || defined(SUNOS4) || defined(FREEBSD) */

 #ifdef LINUX
 int
 sys_mq_open(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		printpath(tcp, tcp->u_arg[0]);
 		tprintf(", ");
 		/* flags */
 		tprint_open_modes(tcp->u_arg[1]);
 		if (tcp->u_arg[1] & O_CREAT) {
 # ifndef HAVE_MQUEUE_H
 			tprintf(", %lx", tcp->u_arg[2]);
 # else
 			struct mq_attr attr;
 			/* mode */
 			tprintf(", %#lo, ", tcp->u_arg[2]);
 			if (umove(tcp, tcp->u_arg[3], &attr) < 0)
 				tprintf("{ ??? }");
 			else
 				tprintf("{mq_maxmsg=%ld, mq_msgsize=%ld}",
 					attr.mq_maxmsg, attr.mq_msgsize);
 # endif
 		}
 	}
 	return 0;
 }

 int
 sys_mq_timedsend(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%ld, ", tcp->u_arg[0]);
 		printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 		tprintf(", %lu, %ld, ", tcp->u_arg[2], tcp->u_arg[3]);
 		printtv(tcp, tcp->u_arg[4]);
 	}
 	return 0;
 }

 int
 sys_mq_timedreceive(struct tcb *tcp)
 {
 	if (entering(tcp))
 		tprintf("%ld, ", tcp->u_arg[0]);
 	else {
 		printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
 		tprintf(", %lu, %ld, ", tcp->u_arg[2], tcp->u_arg[3]);
 		printtv(tcp, tcp->u_arg[4]);
 	}
 	return 0;
 }

 int
 sys_mq_notify(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%ld, ", tcp->u_arg[0]);
 		printsigevent(tcp, tcp->u_arg[1]);
 	}
 	return 0;
 }

 static void
 printmqattr(struct tcb *tcp, long addr)
 {
 	if (addr == 0)
 		tprintf("NULL");
 	else {
 # ifndef HAVE_MQUEUE_H
 		tprintf("%#lx", addr);
 # else
 		struct mq_attr attr;
 		if (umove(tcp, addr, &attr) < 0) {
 			tprintf("{...}");
 			return;
 		}
 		tprintf("{mq_flags=");
 		tprint_open_modes(attr.mq_flags);
 		tprintf(", mq_maxmsg=%ld, mq_msgsize=%ld, mq_curmsg=%ld}",
 			attr.mq_maxmsg, attr.mq_msgsize, attr.mq_curmsgs);
 # endif
 	}
 }

 int
 sys_mq_getsetattr(struct tcb *tcp)
 {
 	if (entering(tcp)) {
 		tprintf("%ld, ", tcp->u_arg[0]);
 		printmqattr(tcp, tcp->u_arg[1]);
 		tprintf(", ");
 	} else
 		printmqattr(tcp, tcp->u_arg[2]);
 	return 0;
 }
 #endif
	/*
	* 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>
	* 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.
	*
	* $Id$
	*/

	#include "defs.h"

	#if defined(LINUX) \|\| defined(SUNOS4) \|\| defined(FREEBSD)

	# ifdef HAVE_MQUEUE_H
	# include <mqueue.h>
	# endif

	#include <fcntl.h>
	#include <sys/ipc.h>
	#include <sys/sem.h>
	#include <sys/msg.h>
	#include <sys/shm.h>

	#ifndef MSG_STAT
	#define MSG_STAT 11
	#endif
	#ifndef MSG_INFO
	#define MSG_INFO 12
	#endif
	#ifndef SHM_STAT
	#define SHM_STAT 13
	#endif
	#ifndef SHM_INFO
	#define SHM_INFO 14
	#endif
	#ifndef SEM_STAT
	#define SEM_STAT 18
	#endif
	#ifndef SEM_INFO
	#define SEM_INFO 19
	#endif

	#if defined LINUX && !defined IPC_64
	# define IPC_64 0x100
	#endif

	extern void printsigevent(struct tcb *tcp, long arg);

	static const struct xlat msgctl_flags[] = {
	{ IPC_RMID, "IPC_RMID" },
	{ IPC_SET, "IPC_SET" },
	{ IPC_STAT, "IPC_STAT" },
	#ifdef LINUX
	{ IPC_INFO, "IPC_INFO" },
	{ MSG_STAT, "MSG_STAT" },
	{ MSG_INFO, "MSG_INFO" },
	#endif /* LINUX */
	{ 0, NULL },
	};

	static const struct xlat semctl_flags[] = {
	{ IPC_RMID, "IPC_RMID" },
	{ IPC_SET, "IPC_SET" },
	{ IPC_STAT, "IPC_STAT" },
	#ifdef LINUX
	{ IPC_INFO, "IPC_INFO" },
	{ SEM_STAT, "SEM_STAT" },
	{ SEM_INFO, "SEM_INFO" },
	#endif /* LINUX */
	{ GETPID, "GETPID" },
	{ GETVAL, "GETVAL" },
	{ GETALL, "GETALL" },
	{ GETNCNT, "GETNCNT" },
	{ GETZCNT, "GETZCNT" },
	{ SETVAL, "SETVAL" },
	{ SETALL, "SETALL" },
	{ 0, NULL },
	};

	static const struct xlat shmctl_flags[] = {
	{ IPC_RMID, "IPC_RMID" },
	{ IPC_SET, "IPC_SET" },
	{ IPC_STAT, "IPC_STAT" },
	#ifdef LINUX
	{ IPC_INFO, "IPC_INFO" },
	{ SHM_STAT, "SHM_STAT" },
	{ SHM_INFO, "SHM_INFO" },
	#endif /* LINUX */
	#ifdef SHM_LOCK
	{ SHM_LOCK, "SHM_LOCK" },
	#endif
	#ifdef SHM_UNLOCK
	{ SHM_UNLOCK, "SHM_UNLOCK" },
	#endif
	{ 0, NULL },
	};

	static const struct xlat resource_flags[] = {
	{ IPC_CREAT, "IPC_CREAT" },
	{ IPC_EXCL, "IPC_EXCL" },
	{ IPC_NOWAIT, "IPC_NOWAIT" },
	{ 0, NULL },
	};

	static const struct xlat shm_resource_flags[] = {
	{ IPC_CREAT, "IPC_CREAT" },
	{ IPC_EXCL, "IPC_EXCL" },
	#ifdef SHM_HUGETLB
	{ SHM_HUGETLB, "SHM_HUGETLB" },
	#endif
	{ 0, NULL },
	};

	static const struct xlat shm_flags[] = {
	#ifdef LINUX
	{ SHM_REMAP, "SHM_REMAP" },
	#endif /* LINUX */
	{ SHM_RDONLY, "SHM_RDONLY" },
	{ SHM_RND, "SHM_RND" },
	{ 0, NULL },
	};

	static const struct xlat msg_flags[] = {
	{ MSG_NOERROR, "MSG_NOERROR" },
	#ifdef LINUX
	{ MSG_EXCEPT, "MSG_EXCEPT" },
	#endif /* LINUX */
	{ IPC_NOWAIT, "IPC_NOWAIT" },
	{ 0, NULL },
	};

	static const struct xlat semop_flags[] = {
	{ SEM_UNDO, "SEM_UNDO" },
	{ IPC_NOWAIT, "IPC_NOWAIT" },
	{ 0, NULL },
	};

	int sys_msgget(tcp)
	struct tcb *tcp;
	{
	if (entering(tcp)) {
	if (tcp->u_arg[0])
	tprintf("%#lx", tcp->u_arg[0]);
	else
	tprintf("IPC_PRIVATE");
	tprintf(", ");
	if (printflags(resource_flags, tcp->u_arg[1] & ~0777, NULL) != 0)
	tprintf("\|");
	tprintf("%#lo", tcp->u_arg[1] & 0777);
	}
	return 0;
	}

	#ifdef IPC_64
	# define PRINTCTL(flagset, arg, dflt) \
	if ((arg) & IPC_64) tprintf("IPC_64\|"); \
	printxval((flagset), (arg) &~ IPC_64, dflt)
	#else
	# define PRINTCTL printxval
	#endif

	static int
	indirect_ipccall(tcp)
	struct tcb *tcp;
	{
	#ifdef LINUX
	#ifdef X86_64
	return current_personality > 0;
	#endif
	#if defined IA64
	return tcp->scno < 1024; /* ia32 emulation syscalls are low */
	#endif
	#if !defined MIPS && !defined HPPA
	return 1;
	#endif
	#endif /* LINUX */
	return 0;
	}

	int sys_msgctl(tcp)
	struct tcb *tcp;
	{
	if (entering(tcp)) {
	tprintf("%lu, ", tcp->u_arg[0]);
	PRINTCTL(msgctl_flags, tcp->u_arg[1], "MSG_???");
	tprintf(", %#lx", tcp->u_arg[indirect_ipccall(tcp) ? 3 : 2]);
	}
	return 0;
	}

	static void
	tprint_msgsnd(struct tcb *tcp, long addr, unsigned long count)
	{
	long mtype;

	if (umove(tcp, addr, &mtype) < 0) {
	tprintf("%#lx", addr);
	} else {
	tprintf("{%lu, ", mtype);
	printstr(tcp, addr + sizeof(mtype), count);
	tprintf("}");
	}
	tprintf(", %lu, ", count);
	printflags(msg_flags, tcp->u_arg[3], "MSG_???");
	}

	int sys_msgsnd(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%lu, ", tcp->u_arg[0]);
	if (indirect_ipccall(tcp)) {
	tprint_msgsnd(tcp, tcp->u_arg[3], tcp->u_arg[1]);
	} else {
	tprint_msgsnd(tcp, tcp->u_arg[1], tcp->u_arg[2]);
	}
	}
	return 0;
	}

	int sys_msgrcv(tcp)
	struct tcb *tcp;
	{
	long mtype;

	if (entering(tcp)) {
	tprintf("%lu, ", tcp->u_arg[0]);
	} else {
	tprintf("%lu", tcp->u_arg[0]);
	if (indirect_ipccall(tcp)) {
	struct ipc_wrapper {
	struct msgbuf *msgp;
	long msgtyp;
	} tmp;
	umove(tcp, tcp->u_arg[3], &tmp);
	umove(tcp, (long) tmp.msgp, &mtype);
	tprintf(", {%lu, ", mtype);
	printstr(tcp, (long) (tmp.msgp) + sizeof(long),
	tcp->u_arg[1]);
	tprintf("}, %lu", tcp->u_arg[1]);
	tprintf(", %ld", tmp.msgtyp);
	tprintf(", ");
	printflags(msg_flags, tcp->u_arg[2], "MSG_???");
	} else {
	umove(tcp, tcp->u_arg[1], &mtype);
	tprintf("{%lu, ", mtype);
	printstr(tcp, tcp->u_arg[1] + sizeof(long),
	tcp->u_arg[2]);
	tprintf("}, %lu", tcp->u_arg[2]);
	tprintf(", %ld", tcp->u_arg[3]);
	tprintf(", ");
	printflags(msg_flags, tcp->u_arg[4], "MSG_???");
	}
	}
	return 0;
	}

	static void
	tprint_sembuf(struct tcb *tcp, long addr, unsigned long count)
	{
	unsigned long i, max_count;

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

	if (!max_count) {
	tprintf("%#lx, %lu", addr, count);
	return;
	}

	for(i = 0; i < max_count; ++i) {
	struct sembuf sb;
	if (i)
	tprintf(", ");
	if (umove(tcp, addr + i * sizeof(struct sembuf), &sb) < 0) {
	if (i) {
	tprintf("{???}");
	break;
	} else {
	tprintf("%#lx, %lu", addr, count);
	return;
	}
	} else {
	if (!i)
	tprintf("{");
	tprintf("{%u, %d, ", sb.sem_num, sb.sem_op);
	printflags(semop_flags, sb.sem_flg, "SEM_???");
	tprintf("}");
	}
	}

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

	tprintf("}, %lu", count);
	}

	int sys_semop(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%lu, ", tcp->u_arg[0]);
	if (indirect_ipccall(tcp)) {
	tprint_sembuf(tcp, tcp->u_arg[3], tcp->u_arg[1]);
	} else {
	tprint_sembuf(tcp, tcp->u_arg[1], tcp->u_arg[2]);
	}
	}
	return 0;
	}

	#ifdef LINUX
	int sys_semtimedop(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%lu, ", tcp->u_arg[0]);
	if (indirect_ipccall(tcp)) {
	tprint_sembuf(tcp, tcp->u_arg[3], tcp->u_arg[1]);
	tprintf(", ");
	printtv(tcp, tcp->u_arg[5]);
	} else {
	tprint_sembuf(tcp, tcp->u_arg[1], tcp->u_arg[2]);
	tprintf(", ");
	printtv(tcp, tcp->u_arg[3]);
	}
	}
	return 0;
	}
	#endif

	int sys_semget(tcp)
	struct tcb *tcp;
	{
	if (entering(tcp)) {
	if (tcp->u_arg[0])
	tprintf("%#lx", tcp->u_arg[0]);
	else
	tprintf("IPC_PRIVATE");
	tprintf(", %lu", tcp->u_arg[1]);
	tprintf(", ");
	if (printflags(resource_flags, tcp->u_arg[2] & ~0777, NULL) != 0)
	tprintf("\|");
	tprintf("%#lo", tcp->u_arg[2] & 0777);
	}
	return 0;
	}

	int sys_semctl(tcp)
	struct tcb *tcp;
	{
	if (entering(tcp)) {
	tprintf("%lu", tcp->u_arg[0]);
	tprintf(", %lu, ", tcp->u_arg[1]);
	PRINTCTL(semctl_flags, tcp->u_arg[2], "SEM_???");
	tprintf(", %#lx", tcp->u_arg[3]);
	}
	return 0;
	}

	int sys_shmget(tcp)
	struct tcb *tcp;
	{
	if (entering(tcp)) {
	if (tcp->u_arg[0])
	tprintf("%#lx", tcp->u_arg[0]);
	else
	tprintf("IPC_PRIVATE");
	tprintf(", %lu", tcp->u_arg[1]);
	tprintf(", ");
	if (printflags(shm_resource_flags, tcp->u_arg[2] & ~0777, NULL) != 0)
	tprintf("\|");
	tprintf("%#lo", tcp->u_arg[2] & 0777);
	}
	return 0;
	}

	int sys_shmctl(tcp)
	struct tcb *tcp;
	{
	if (entering(tcp)) {
	tprintf("%lu, ", tcp->u_arg[0]);
	PRINTCTL(shmctl_flags, tcp->u_arg[1], "SHM_???");
	if (indirect_ipccall(tcp)) {
	tprintf(", %#lx", tcp->u_arg[3]);
	} else {
	tprintf(", %#lx", tcp->u_arg[2]);
	}
	}
	return 0;
	}

	int sys_shmat(tcp)
	struct tcb *tcp;
	{
	#ifdef LINUX
	unsigned long raddr;
	#endif /* LINUX */

	if (exiting(tcp)) {
	tprintf("%lu", tcp->u_arg[0]);
	if (indirect_ipccall(tcp)) {
	tprintf(", %#lx", tcp->u_arg[3]);
	tprintf(", ");
	printflags(shm_flags, tcp->u_arg[1], "SHM_???");
	} else {
	tprintf(", %#lx", tcp->u_arg[1]);
	tprintf(", ");
	printflags(shm_flags, tcp->u_arg[2], "SHM_???");
	}
	if (syserror(tcp))
	return 0;
	/* HPPA does not use an IPC multiplexer on Linux. */
	#if defined(LINUX) && !defined(HPPA)
	if (umove(tcp, tcp->u_arg[2], &raddr) < 0)
	return RVAL_NONE;
	tcp->u_rval = raddr;
	#endif /* LINUX */
	return RVAL_HEX;
	}
	return 0;
	}

	int sys_shmdt(tcp)
	struct tcb *tcp;
	{
	if (entering(tcp)) {
	if (indirect_ipccall(tcp)) {
	tprintf("%#lx", tcp->u_arg[3]);
	} else {
	tprintf("%#lx", tcp->u_arg[0]);
	}
	}
	return 0;
	}

	#endif /* defined(LINUX) \|\| defined(SUNOS4) \|\| defined(FREEBSD) */

	#ifdef LINUX
	int
	sys_mq_open(struct tcb *tcp)
	{
	if (entering(tcp)) {
	printpath(tcp, tcp->u_arg[0]);
	tprintf(", ");
	/* flags */
	tprint_open_modes(tcp->u_arg[1]);
	if (tcp->u_arg[1] & O_CREAT) {
	# ifndef HAVE_MQUEUE_H
	tprintf(", %lx", tcp->u_arg[2]);
	# else
	struct mq_attr attr;
	/* mode */
	tprintf(", %#lo, ", tcp->u_arg[2]);
	if (umove(tcp, tcp->u_arg[3], &attr) < 0)
	tprintf("{ ??? }");
	else
	tprintf("{mq_maxmsg=%ld, mq_msgsize=%ld}",
	attr.mq_maxmsg, attr.mq_msgsize);
	# endif
	}
	}
	return 0;
	}

	int
	sys_mq_timedsend(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%ld, ", tcp->u_arg[0]);
	printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
	tprintf(", %lu, %ld, ", tcp->u_arg[2], tcp->u_arg[3]);
	printtv(tcp, tcp->u_arg[4]);
	}
	return 0;
	}

	int
	sys_mq_timedreceive(struct tcb *tcp)
	{
	if (entering(tcp))
	tprintf("%ld, ", tcp->u_arg[0]);
	else {
	printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
	tprintf(", %lu, %ld, ", tcp->u_arg[2], tcp->u_arg[3]);
	printtv(tcp, tcp->u_arg[4]);
	}
	return 0;
	}

	int
	sys_mq_notify(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%ld, ", tcp->u_arg[0]);
	printsigevent(tcp, tcp->u_arg[1]);
	}
	return 0;
	}

	static void
	printmqattr(struct tcb *tcp, long addr)
	{
	if (addr == 0)
	tprintf("NULL");
	else {
	# ifndef HAVE_MQUEUE_H
	tprintf("%#lx", addr);
	# else
	struct mq_attr attr;
	if (umove(tcp, addr, &attr) < 0) {
	tprintf("{...}");
	return;
	}
	tprintf("{mq_flags=");
	tprint_open_modes(attr.mq_flags);
	tprintf(", mq_maxmsg=%ld, mq_msgsize=%ld, mq_curmsg=%ld}",
	attr.mq_maxmsg, attr.mq_msgsize, attr.mq_curmsgs);
	# endif
	}
	}

	int
	sys_mq_getsetattr(struct tcb *tcp)
	{
	if (entering(tcp)) {
	tprintf("%ld, ", tcp->u_arg[0]);
	printmqattr(tcp, tcp->u_arg[1]);
	tprintf(", ");
	} else
	printmqattr(tcp, tcp->u_arg[2]);
	return 0;
	}
	#endif