desc.c

linux进程跟踪的工具和源代码

/*
 * Copyright (c) 1991, 1992 Paul Kranenburg <[e-mail]>
 * Copyright (c) 1993 Branko Lankester <[e-mail]>
 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <[e-mail]>
 * Copyright (c) 1996-1999 Wichert Akkerman <[e-mail]>
 * 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: desc.c,v 1.9 2001/03/08 13:59:00 hughesj Exp $
 */

#include "defs.h"

#include <fcntl.h>
#include <sys/file.h>

#if HAVE_LONG_LONG_OFF_T
/*
 * Hacks for systems that have a long long off_t
 */
#define flock64	flock		/* Horrid hack */
#define printflock printflock64	/* Horrider hack */
#endif


static struct xlat fcntlcmds[] = {
	{ F_DUPFD,	"F_DUPFD"	},
	{ F_GETFD,	"F_GETFD"	},
	{ F_SETFD,	"F_SETFD"	},
	{ F_GETFL,	"F_GETFL"	},
	{ F_SETFL,	"F_SETFL"	},
	{ F_GETLK,	"F_GETLK"	},
	{ F_SETLK,	"F_SETLK"	},
	{ F_SETLKW,	"F_SETLKW"	},
	{ F_GETOWN,	"F_GETOWN"	},
	{ F_SETOWN,	"F_SETOWN"	},
#ifdef F_RSETLK
	{ F_RSETLK,	"F_RSETLK"	},
#endif
#ifdef F_RSETLKW
	{ F_RSETLKW,	"F_RSETLKW"	},
#endif
#ifdef F_RGETLK
	{ F_RGETLK,	"F_RGETLK"	},
#endif
#ifdef F_CNVT
	{ F_CNVT,	"F_CNVT"	},
#endif
#ifdef F_SETSIG
	{ F_SETSIG,	"F_SETSIG"	},
#endif
#ifdef F_GETSIG
	{ F_GETSIG,	"F_GETSIG"	},
#endif
#ifdef F_CHKFL
	{ F_CHKFL,	"F_CHKFL"	},
#endif
#ifdef F_DUP2FD
	{ F_DUP2FD,	"F_DUP2FD"	},
#endif
#ifdef F_ALLOCSP
	{ F_ALLOCSP,	"F_ALLOCSP"	},
#endif
#ifdef F_ISSTREAM
	{ F_ISSTREAM,	"F_ISSTREAM"	},
#endif
#ifdef F_PRIV
	{ F_PRIV,	"F_PRIV"	},
#endif
#ifdef F_NPRIV
	{ F_NPRIV,	"F_NPRIV"	},
#endif
#ifdef F_QUOTACL
	{ F_QUOTACL,	"F_QUOTACL"	},
#endif
#ifdef F_BLOCKS
	{ F_BLOCKS,	"F_BLOCKS"	},
#endif
#ifdef F_BLKSIZE
	{ F_BLKSIZE,	"F_BLKSIZE"	},
#endif
#ifdef F_GETOWN
	{ F_GETOWN,	"F_GETOWN"	},
#endif
#ifdef F_SETOWN
	{ F_SETOWN,	"F_SETOWN"	},
#endif
#ifdef F_REVOKE
	{ F_REVOKE,	"F_REVOKE"	},
#endif
#ifdef F_SETLK
	{ F_SETLK,	"F_SETLK"	},
#endif
#ifdef F_SETLKW
	{ F_SETLKW,	"F_SETLKW"	},
#endif
#ifdef F_FREESP
	{ F_FREESP,	"F_FREESP"	},
#endif
#ifdef F_GETLK
	{ F_GETLK,	"F_GETLK"	},
#endif
#ifdef F_SETLK64
	{ F_SETLK64,	"F_SETLK64"	},
#endif
#ifdef F_SETLKW64
	{ F_SETLKW64,	"F_SETLKW64"	},
#endif
#ifdef F_FREESP64
	{ F_FREESP64,	"F_FREESP64"	},
#endif
#ifdef F_GETLK64
	{ F_GETLK64,	"F_GETLK64"	},
#endif
#ifdef F_SHARE
	{ F_SHARE,	"F_SHARE"	},
#endif
#ifdef F_UNSHARE
	{ F_UNSHARE,	"F_UNSHARE"	},
#endif
	{ 0,		NULL		},
};

static struct xlat fdflags[] = {
#ifdef FD_CLOEXEC
	{ FD_CLOEXEC,	"FD_CLOEXEC"	},
#endif
	{ 0,		NULL		},
};

#ifdef LOCK_SH

static struct xlat flockcmds[] = {
	{ LOCK_SH,	"LOCK_SH"	},
	{ LOCK_EX,	"LOCK_EX"	},
	{ LOCK_NB,	"LOCK_NB"	},
	{ LOCK_UN,	"LOCK_UN"	},
	{ 0,		NULL		},
};

#endif /* LOCK_SH */

static struct xlat lockfcmds[] = {
	{ F_RDLCK,	"F_RDLCK"	},
	{ F_WRLCK,	"F_WRLCK"	},
	{ F_UNLCK,	"F_UNLCK"	},
#ifdef F_EXLCK
	{ F_EXLCK,	"F_EXLCK"	},
#endif
#ifdef F_SHLCK
	{ F_SHLCK,	"F_SHLCK"	},
#endif
	{ 0,		NULL		},
};

static struct xlat whence[] = {
	{ SEEK_SET,	"SEEK_SET"	},
	{ SEEK_CUR,	"SEEK_CUR"	},
	{ SEEK_END,	"SEEK_END"	},
	{ 0,		NULL		},
};

#ifndef HAVE_LONG_LONG_OFF_T
/* fcntl/lockf */
static void
printflock(tcp, addr, getlk)
struct tcb *tcp;
long addr;
int getlk;
{
	struct flock fl;

	if (umove(tcp, addr, &fl) < 0) {
		tprintf("{...}");
		return;
	}
	tprintf("{type=");
	printxval(lockfcmds, fl.l_type, "F_???");
	tprintf(", whence=");
	printxval(whence, fl.l_whence, "SEEK_???");
	tprintf(", start=%ld, len=%ld", fl.l_start, fl.l_len);
	if (getlk)
		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
	else
		tprintf("}");
}
#endif

#if _LFS64_LARGEFILE || HAVE_LONG_LONG_OFF_T
/* fcntl/lockf */
static void
printflock64(tcp, addr, getlk)
struct tcb *tcp;
int addr;
int getlk;
{
	struct flock64 fl;

	if (umove(tcp, addr, &fl) < 0) {
		tprintf("{...}");
		return;
	}
	tprintf("{type=");
	printxval(lockfcmds, fl.l_type, "F_???");
	tprintf(", whence=");
	printxval(whence, fl.l_whence, "SEEK_???");
	tprintf(", start=%lld, len=%lld", fl.l_start, fl.l_len);
	if (getlk)
		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
	else
		tprintf("}");
}
#endif

static char *
sprintflags(xlat, flags)
struct xlat *xlat;
int flags;
{
	static char outstr[1024];
	char *sep;

	strcpy(outstr, "flags ");
	sep = "";
	for (; xlat->str; xlat++) {
		if ((flags & xlat->val) == xlat->val) {
			sprintf(outstr + strlen(outstr),
				"%s%s", sep, xlat->str);
			sep = "|";
			flags &= ~xlat->val;
		}
	}
	if (flags)
		sprintf(outstr + strlen(outstr),
			"%s%#x", sep, flags);
	return outstr;
}

int
sys_fcntl(tcp)
struct tcb *tcp;
{
	extern struct xlat openmodes[];

	if (entering(tcp)) {
		tprintf("%ld, ", tcp->u_arg[0]);
		printxval(fcntlcmds, tcp->u_arg[1], "F_???");
		switch (tcp->u_arg[1]) {
		case F_SETFD:
			tprintf(", ");
			if (printflags(fdflags, tcp->u_arg[2]) == 0)
				tprintf("0");
			break;
		case F_SETOWN: case F_DUPFD:
			tprintf(", %ld", tcp->u_arg[2]);
			break;
		case F_SETFL:
			tprintf(", ");
			if (printflags(openmodes, tcp->u_arg[2] + 1) == 0)
				tprintf("0");
			break;
		case F_SETLK: case F_SETLKW:
#ifdef F_FREESP
		case F_FREESP:
#endif
			tprintf(", ");
			printflock(tcp, tcp->u_arg[2], 0);
			break;
#if _LFS64_LARGEFILE
#ifdef F_FREESP64
		case F_FREESP64:
#endif
		/* Linux glibc defines SETLK64 as SETLK, 
		   even though the kernel has different values - as does Solaris. */
#if defined(F_SETLK64) && F_SETLK64+0!=F_SETLK
		case F_SETLK64:
#endif
#if defined(F_SETLKW64) && F_SETLKW64+0!=F_SETLKW
		case F_SETLKW64:
#endif
			tprintf(", ");
			printflock64(tcp, tcp->u_arg[2], 0);
			break;
#endif
 		}
	}
	else {
		switch (tcp->u_arg[1]) {
		case F_DUPFD:
		case F_SETFD: case F_SETFL:
		case F_SETLK: case F_SETLKW:
		case F_SETOWN: case F_GETOWN:
			break;
		case F_GETFD:
			if (tcp->u_rval == 0)
				return 0;
			tcp->auxstr = sprintflags(fdflags, tcp->u_rval);
			return RVAL_HEX|RVAL_STR;
		case F_GETFL:
			tcp->auxstr = sprintflags(openmodes, tcp->u_rval + 1);
			return RVAL_HEX|RVAL_STR;
		case F_GETLK:
			tprintf(", ");
			printflock(tcp, tcp->u_arg[2], 1);
			break;
#if _LFS64_LARGEFILE
#if defined(F_GETLK64) && F_GETLK64+0!=F_GETLK
		case F_GETLK64:
#endif
			tprintf(", ");
			printflock64(tcp, tcp->u_arg[2], 1);
			break;
#endif
 		default:
			tprintf(", %#lx", tcp->u_arg[2]);
			break;
		}
	}
	return 0;
}

#ifdef LOCK_SH

int
sys_flock(tcp)
struct tcb *tcp;
{
	if (entering(tcp)) {
		tprintf("%ld, ", tcp->u_arg[0]);
		if (!printflags(flockcmds, tcp->u_arg[1]))
			tprintf("LOCK_???");
	}
	return 0;
}
#endif /* LOCK_SH */

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

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

int
sys_dup2(tcp)
struct tcb *tcp;
{
	if (entering(tcp)) {
		tprintf("%ld, %ld", tcp->u_arg[0], tcp->u_arg[1]);
	}
	return 0;
}

int
sys_getdtablesize(tcp)
struct tcb *tcp;
{
	return 0;
}

static int
decode_select(tcp, args, bitness)
struct tcb *tcp;
long *args;
int bitness;
{
	int i, j, nfds;
	fd_set fds;
	struct timeval tv;
#ifdef ALPHA
	struct timeval32 {
		unsigned tv_sec;
		unsigned tv_usec;
	} *tv32;
#endif
	static char outstr[1024];
	char *sep;
	long arg;

	if (entering(tcp)) {
		nfds = args[0];
		tprintf("%d", nfds);
		for (i = 0; i < 3; i++) {
			arg = args[i+1];
			if (arg == 0) {
				tprintf(", NULL");
				continue;
			}
			if (!verbose(tcp)) {
				tprintf(", %#lx", arg);
				continue;
			}
			if (umove(tcp, arg, &fds) < 0) {
				tprintf(", [?]");
				continue;
			}
			tprintf(", [");
			for (j = 0, sep = ""; j < nfds; j++) {
				if (FD_ISSET(j, &fds)) {
					tprintf("%s%u", sep, j);
					sep = " ";
				}
			}
			tprintf("]");
		}
		if (!args[4])
			tprintf(", NULL");
		else if (!verbose(tcp))
			tprintf(", %#lx", args[4]);
		else if (umove(tcp, args[4], &tv) < 0)
			tprintf(", {...}");
		else {
#ifdef ALPHA
			if (bitness) {
				tv32=(struct timeval32*)&tv;
				tprintf(", {%u, %u}", tv32->tv_sec, tv32->tv_usec);
			} else
#endif
				tprintf(", {%lu, %lu}",
					(long) tv.tv_sec, (long) tv.tv_usec);
		}
	}
	else
	{
		unsigned int cumlen = 0;
		char *sep = "";

		if (syserror(tcp))
			return 0;

		if ((nfds = tcp->u_rval) == 0) {
			tcp->auxstr = "Timeout";
			return RVAL_STR;
		}
		outstr[0] = '\0';
		for (i = 0; i < 3; i++) {
			int first = 1;
			char str[20];

			tcp->auxstr = outstr;
			arg = args[i+1];
			if (!arg || umove(tcp, arg, &fds) < 0)
				continue;
			for (j = 0; j < args[0]; j++) {
				if (FD_ISSET(j, &fds)) {
					if (first) {
						sprintf(str, "%s%s [%u", sep,
							i == 0 ? "in" :
							i == 1 ? "out" :
							"except", j);
						first = 0;
						sep = ", ";
					}
					else
						sprintf(str, " %u", j);
					cumlen += strlen(str);
					if (cumlen < sizeof(outstr))
						strcat(outstr, str);
					nfds--;
				}
			}
			if (cumlen)
				strcat(outstr, "]");
			if (nfds == 0)
				break;
		}
#ifdef LINUX
		/* This contains no useful information on SunOS.  */
		if (args[4]) {
			char str[20];

			if (umove(tcp, args[4], &tv) >= 0) {
#ifdef ALPHA
				if (bitness) {
					tv32=(struct timeval32*)&tv;
					sprintf(str, "%sleft {%u, %u}", sep,
						tv32->tv_sec, tv32->tv_usec);
				} else
#endif
					sprintf(str, "%sleft {%lu, %lu}", sep,
						(long) tv.tv_sec, (long) tv.tv_usec);

				if ((cumlen += strlen(str)) < sizeof(outstr))
					strcat(outstr, str);
			}
		}
#endif /* LINUX */
		return RVAL_STR;
	}
	return 0;
}

#ifdef LINUX

int
sys_oldselect(tcp)
struct tcb *tcp;
{
	long args[5];

	if (umoven(tcp, tcp->u_arg[0], sizeof args, (char *) args) < 0) {
		tprintf("[...]");
		return 0;
	}
	return decode_select(tcp, args, 0);
}

#ifdef ALPHA
sys_osf_select(tcp)
struct tcb *tcp;
{
	long *args = tcp->u_arg;
	return decode_select(tcp, args, 1);
}
#endif

#endif /* LINUX */

int
sys_select(tcp)
struct tcb *tcp;
{
	long *args = tcp->u_arg;
	return decode_select(tcp, args, 0);
}