aboutsummaryrefslogblamecommitdiff
path: root/cddl/contrib/opensolaris/cmd/dtrace/dtrace.c
blob: 393a7217df25e6d3667cab41250b6d7cbbc919b4 (plain) (tree)
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
























                                                                      

                                                      
                                                        
   








                      
                   





                    
              
                   
      
                   
              
                    
      


                  







































                                                                                


                     








                                  
                   
                           
              













                                                                               
      















































































                                                                                






                                                                              






                            
                                             


                               
















                                                               
                                             



                                                                   































































































































































                                                                              


































                                                                               













































































































                                                                            
                         




                                             
                   






















                                                          



                                                           


                                                                        
                                                              






























































































                                                                               
                                 
 
                  
          

                                                                             
           
                                   




                                      






                                             

      





















                                                                               


                                                                      

                                                                      
                             


















                                                                               


                           















































































                                                                                
              


                                         



                                       





                                                 
              
                            


                                
                       
              











                                                                               




                                                                
              


                                                                            




                                                                










                                                                                















































































































































































































































































































































































                                                                                
                     


                                









                           














                                                                               
                  




                                                                               



                                                                               


      



                             



                                  
                       
                               

                      

























                                                                               
                                                                       



















































































































































                                                                                




                                                                             

                                                     
      
                                                       































                                                                                
                                                                       



























































































































































                                                                                
                                                                       




                                                                           
                                                                                   
















































































                                                                                
              
                                                            


                                                                       
                                               


                                                     

                                                                          
              
                                                                            
      





























                                                                               



                              

                                                                          
      
































                                                                             

                                  




















































































                                                                                
                          
 













                                                                             






                                                                         









































                                                                          
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/*
 * Copyright (c) 2012 by Delphix. All rights reserved.
 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>

#include <dtrace.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <limits.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#ifdef illumos
#include <alloca.h>
#endif
#include <libgen.h>
#ifdef illumos
#include <libproc.h>
#endif
#ifdef __FreeBSD__
#include <spawn.h>
#endif

typedef struct dtrace_cmd {
	void (*dc_func)(struct dtrace_cmd *);	/* function to compile arg */
	dtrace_probespec_t dc_spec;		/* probe specifier context */
	char *dc_arg;				/* argument from main argv */
	const char *dc_name;			/* name for error messages */
	const char *dc_desc;			/* desc for error messages */
	dtrace_prog_t *dc_prog;			/* program compiled from arg */
	char dc_ofile[PATH_MAX];		/* derived output file name */
} dtrace_cmd_t;

#define	DMODE_VERS	0	/* display version information and exit (-V) */
#define	DMODE_EXEC	1	/* compile program for enabling (-a/e/E) */
#define	DMODE_ANON	2	/* compile program for anonymous tracing (-A) */
#define	DMODE_LINK	3	/* compile program for linking with ELF (-G) */
#define	DMODE_LIST	4	/* compile program and list probes (-l) */
#define	DMODE_HEADER	5	/* compile program for headergen (-h) */

#define	E_SUCCESS	0
#define	E_ERROR		1
#define	E_USAGE		2

static const char DTRACE_OPTSTR[] =
	"3:6:aAb:Bc:CD:ef:FGhHi:I:lL:m:n:o:p:P:qs:SU:vVwx:X:Z";

static char **g_argv;
static int g_argc;
static char **g_objv;
static int g_objc;
static dtrace_cmd_t *g_cmdv;
static int g_cmdc;
static struct ps_prochandle **g_psv;
static int g_psc;
static int g_pslive;
static char *g_pname;
static int g_quiet;
static int g_flowindent;
static int g_intr;
static int g_impatient;
static int g_newline;
#ifdef __FreeBSD__
static int g_siginfo;
#endif
static int g_total;
static int g_cflags;
static int g_oflags;
static int g_verbose;
static int g_exec = 1;
static int g_mode = DMODE_EXEC;
static int g_status = E_SUCCESS;
static int g_grabanon = 0;
static const char *g_ofile = NULL;
static FILE *g_ofp;
static dtrace_hdl_t *g_dtp;
#ifdef illumos
static char *g_etcfile = "/etc/system";
static const char *g_etcbegin = "* vvvv Added by DTrace";
static const char *g_etcend = "* ^^^^ Added by DTrace";

static const char *g_etc[] =  {
"*",
"* The following forceload directives were added by dtrace(1M) to allow for",
"* tracing during boot.  If these directives are removed, the system will",
"* continue to function, but tracing will not occur during boot as desired.",
"* To remove these directives (and this block comment) automatically, run",
"* \"dtrace -A\" without additional arguments.  See the \"Anonymous Tracing\"",
"* chapter of the Solaris Dynamic Tracing Guide for details.",
"*",
NULL };
#endif

static int
usage(FILE *fp)
{
	static const char predact[] = "[[ predicate ] action ]";

	(void) fprintf(fp, "Usage: %s [-32|-64] [-aACeFGhHlqSvVwZ] "
	    "[-b bufsz] [-c cmd] [-D name[=def]]\n\t[-I path] [-L path] "
	    "[-o output] [-p pid] [-s script] [-U name]\n\t"
	    "[-x opt[=val]] [-X a|c|s|t]\n\n"
	    "\t[-P provider %s]\n"
	    "\t[-m [ provider: ] module %s]\n"
	    "\t[-f [[ provider: ] module: ] func %s]\n"
	    "\t[-n [[[ provider: ] module: ] func: ] name %s]\n"
	    "\t[-i probe-id %s] [ args ... ]\n\n", g_pname,
	    predact, predact, predact, predact, predact);

	(void) fprintf(fp, "\tpredicate -> '/' D-expression '/'\n");
	(void) fprintf(fp, "\t   action -> '{' D-statements '}'\n");

	(void) fprintf(fp, "\n"
	    "\t-32 generate 32-bit D programs and ELF files\n"
	    "\t-64 generate 64-bit D programs and ELF files\n\n"
	    "\t-a  claim anonymous tracing state\n"
	    "\t-A  generate driver.conf(4) directives for anonymous tracing\n"
	    "\t-b  set trace buffer size\n"
	    "\t-c  run specified command and exit upon its completion\n"
	    "\t-C  run cpp(1) preprocessor on script files\n"
	    "\t-D  define symbol when invoking preprocessor\n"
	    "\t-e  exit after compiling request but prior to enabling probes\n"
	    "\t-f  enable or list probes matching the specified function name\n"
	    "\t-F  coalesce trace output by function\n"
	    "\t-G  generate an ELF file containing embedded dtrace program\n"
	    "\t-h  generate a header file with definitions for static probes\n"
	    "\t-H  print included files when invoking preprocessor\n"
	    "\t-i  enable or list probes matching the specified probe id\n"
	    "\t-I  add include directory to preprocessor search path\n"
	    "\t-l  list probes matching specified criteria\n"
	    "\t-L  add library directory to library search path\n"
	    "\t-m  enable or list probes matching the specified module name\n"
	    "\t-n  enable or list probes matching the specified probe name\n"
	    "\t-o  set output file\n"
	    "\t-p  grab specified process-ID and cache its symbol tables\n"
	    "\t-P  enable or list probes matching the specified provider name\n"
	    "\t-q  set quiet mode (only output explicitly traced data)\n"
	    "\t-s  enable or list probes according to the specified D script\n"
	    "\t-S  print D compiler intermediate code\n"
	    "\t-U  undefine symbol when invoking preprocessor\n"
	    "\t-v  set verbose mode (report stability attributes, arguments)\n"
	    "\t-V  report DTrace API version\n"
	    "\t-w  permit destructive actions\n"
	    "\t-x  enable or modify compiler and tracing options\n"
	    "\t-X  specify ISO C conformance settings for preprocessor\n"
	    "\t-Z  permit probe descriptions that match zero probes\n");

	return (E_USAGE);
}

static void
verror(const char *fmt, va_list ap)
{
	int error = errno;

	(void) fprintf(stderr, "%s: ", g_pname);
	(void) vfprintf(stderr, fmt, ap);

	if (fmt[strlen(fmt) - 1] != '\n')
		(void) fprintf(stderr, ": %s\n", strerror(error));
}

/*PRINTFLIKE1*/
static void
fatal(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	verror(fmt, ap);
	va_end(ap);

	/*
	 * Close the DTrace handle to ensure that any controlled processes are
	 * correctly restored and continued.
	 */
	if (g_dtp)
		dtrace_close(g_dtp);

	exit(E_ERROR);
}

/*PRINTFLIKE1*/
static void
dfatal(const char *fmt, ...)
{
#if !defined(illumos) && defined(NEED_ERRLOC)
	char *p_errfile = NULL;
	int errline = 0;
#endif
	va_list ap;

	va_start(ap, fmt);

	(void) fprintf(stderr, "%s: ", g_pname);
	if (fmt != NULL)
		(void) vfprintf(stderr, fmt, ap);

	va_end(ap);

	if (fmt != NULL && fmt[strlen(fmt) - 1] != '\n') {
		(void) fprintf(stderr, ": %s\n",
		    dtrace_errmsg(g_dtp, dtrace_errno(g_dtp)));
	} else if (fmt == NULL) {
		(void) fprintf(stderr, "%s\n",
		    dtrace_errmsg(g_dtp, dtrace_errno(g_dtp)));
	}
#if !defined(illumos) && defined(NEED_ERRLOC)
	dt_get_errloc(g_dtp, &p_errfile, &errline);
	if (p_errfile != NULL)
		printf("File '%s', line %d\n", p_errfile, errline);
#endif

	/*
	 * Close the DTrace handle to ensure that any controlled processes are
	 * correctly restored and continued.
	 */
	dtrace_close(g_dtp);

	exit(E_ERROR);
}

/*PRINTFLIKE1*/
static void
error(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	verror(fmt, ap);
	va_end(ap);
}

/*PRINTFLIKE1*/
static void
notice(const char *fmt, ...)
{
	va_list ap;

	if (g_quiet)
		return; /* -q or quiet pragma suppresses notice()s */

	va_start(ap, fmt);
	verror(fmt, ap);
	va_end(ap);
}

/*PRINTFLIKE1*/
static void
oprintf(const char *fmt, ...)
{
	va_list ap;
	int n;

	if (g_ofp == NULL)
		return;

	va_start(ap, fmt);
	n = vfprintf(g_ofp, fmt, ap);
	va_end(ap);

	if (n < 0) {
		if (errno != EINTR) {
			fatal("failed to write to %s",
			    g_ofile ? g_ofile : "<stdout>");
		}
		clearerr(g_ofp);
	}
}

static char **
make_argv(char *s)
{
	const char *ws = "\f\n\r\t\v ";
	char **argv = malloc(sizeof (char *) * (strlen(s) / 2 + 1));
	int argc = 0;
	char *p = s;

	if (argv == NULL)
		return (NULL);

	for (p = strtok(s, ws); p != NULL; p = strtok(NULL, ws))
		argv[argc++] = p;

	if (argc == 0)
		argv[argc++] = s;

	argv[argc] = NULL;
	return (argv);
}

static void
dof_prune(const char *fname)
{
	struct stat sbuf;
	size_t sz, i, j, mark, len;
	char *buf;
	int msg = 0, fd;

	if ((fd = open(fname, O_RDONLY)) == -1) {
		/*
		 * This is okay only if the file doesn't exist at all.
		 */
		if (errno != ENOENT)
			fatal("failed to open %s", fname);
		return;
	}

	if (fstat(fd, &sbuf) == -1)
		fatal("failed to fstat %s", fname);

	if ((buf = malloc((sz = sbuf.st_size) + 1)) == NULL)
		fatal("failed to allocate memory for %s", fname);

	if (read(fd, buf, sz) != sz)
		fatal("failed to read %s", fname);

	buf[sz] = '\0';
	(void) close(fd);

	if ((fd = open(fname, O_WRONLY | O_TRUNC)) == -1)
		fatal("failed to open %s for writing", fname);

	len = strlen("dof-data-");

	for (mark = 0, i = 0; i < sz; i++) {
		if (strncmp(&buf[i], "dof-data-", len) != 0)
			continue;

		/*
		 * This is only a match if it's in the 0th column.
		 */
		if (i != 0 && buf[i - 1] != '\n')
			continue;

		if (msg++ == 0) {
			error("cleaned up old anonymous "
			    "enabling in %s\n", fname);
		}

		/*
		 * We have a match.  First write out our data up until now.
		 */
		if (i != mark) {
			if (write(fd, &buf[mark], i - mark) != i - mark)
				fatal("failed to write to %s", fname);
		}

		/*
		 * Now scan forward until we scan past a newline.
		 */
		for (j = i; j < sz && buf[j] != '\n'; j++)
			continue;

		/*
		 * Reset our mark.
		 */
		if ((mark = j + 1) >= sz)
			break;

		i = j;
	}

	if (mark < sz) {
		if (write(fd, &buf[mark], sz - mark) != sz - mark)
			fatal("failed to write to %s", fname);
	}

	(void) close(fd);
	free(buf);
}

#ifdef __FreeBSD__
/*
 * Use nextboot(8) to tell the loader to load DTrace kernel modules during
 * the next boot of the system. The nextboot(8) configuration is removed during
 * boot, so it will not persist indefinitely.
 */
static void
bootdof_add(void)
{
	char * const nbargv[] = {
		"nextboot", "-a",
		"-e", "dtraceall_load=\"YES\"",
		"-e", "dtrace_dof_load=\"YES\"",
		"-e", "dtrace_dof_name=\"/boot/dtrace.dof\"",
		"-e", "dtrace_dof_type=\"dtrace_dof\"",
		NULL,
	};
	pid_t child;
	int err, status;

	err = posix_spawnp(&child, "nextboot", NULL, NULL, nbargv,
	    NULL);
	if (err != 0) {
		error("failed to execute nextboot: %s", strerror(err));
		exit(E_ERROR);
	}

	if (waitpid(child, &status, 0) != child)
		fatal("waiting for nextboot");
	if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
		error("nextboot returned with status %d", status);
		exit(E_ERROR);
	}
}
#else
static void
etcsystem_prune(void)
{
	struct stat sbuf;
	size_t sz;
	char *buf, *start, *end;
	int fd;
	char *fname = g_etcfile, *tmpname;

	if ((fd = open(fname, O_RDONLY)) == -1)
		fatal("failed to open %s", fname);

	if (fstat(fd, &sbuf) == -1)
		fatal("failed to fstat %s", fname);

	if ((buf = malloc((sz = sbuf.st_size) + 1)) == NULL)
		fatal("failed to allocate memory for %s", fname);

	if (read(fd, buf, sz) != sz)
		fatal("failed to read %s", fname);

	buf[sz] = '\0';
	(void) close(fd);

	if ((start = strstr(buf, g_etcbegin)) == NULL)
		goto out;

	if (strlen(buf) != sz) {
		fatal("embedded nul byte in %s; manual repair of %s "
		    "required\n", fname, fname);
	}

	if (strstr(start + 1, g_etcbegin) != NULL) {
		fatal("multiple start sentinels in %s; manual repair of %s "
		    "required\n", fname, fname);
	}

	if ((end = strstr(buf, g_etcend)) == NULL) {
		fatal("missing end sentinel in %s; manual repair of %s "
		    "required\n", fname, fname);
	}

	if (start > end) {
		fatal("end sentinel preceeds start sentinel in %s; manual "
		    "repair of %s required\n", fname, fname);
	}

	end += strlen(g_etcend) + 1;
	bcopy(end, start, strlen(end) + 1);

	tmpname = alloca(sz = strlen(fname) + 80);
	(void) snprintf(tmpname, sz, "%s.dtrace.%d", fname, getpid());

	if ((fd = open(tmpname,
	    O_WRONLY | O_CREAT | O_EXCL, sbuf.st_mode)) == -1)
		fatal("failed to create %s", tmpname);

	if (write(fd, buf, strlen(buf)) < strlen(buf)) {
		(void) unlink(tmpname);
		fatal("failed to write to %s", tmpname);
	}

	(void) close(fd);

	if (chown(tmpname, sbuf.st_uid, sbuf.st_gid) != 0) {
		(void) unlink(tmpname);
		fatal("failed to chown(2) %s to uid %d, gid %d", tmpname,
		    (int)sbuf.st_uid, (int)sbuf.st_gid);
	}

	if (rename(tmpname, fname) == -1)
		fatal("rename of %s to %s failed", tmpname, fname);

	error("cleaned up forceload directives in %s\n", fname);
out:
	free(buf);
}

static void
etcsystem_add(void)
{
	const char *mods[20];
	int nmods, line;

	if ((g_ofp = fopen(g_ofile = g_etcfile, "a")) == NULL)
		fatal("failed to open output file '%s'", g_ofile);

	oprintf("%s\n", g_etcbegin);

	for (line = 0; g_etc[line] != NULL; line++)
		oprintf("%s\n", g_etc[line]);

	nmods = dtrace_provider_modules(g_dtp, mods,
	    sizeof (mods) / sizeof (char *) - 1);

	if (nmods >= sizeof (mods) / sizeof (char *))
		fatal("unexpectedly large number of modules!");

	mods[nmods++] = "dtrace";

	for (line = 0; line < nmods; line++)
		oprintf("forceload: drv/%s\n", mods[line]);

	oprintf("%s\n", g_etcend);

	if (fclose(g_ofp) == EOF)
		fatal("failed to close output file '%s'", g_ofile);

	error("added forceload directives to %s\n", g_ofile);
}
#endif /* !__FreeBSD__ */

static void
print_probe_info(const dtrace_probeinfo_t *p)
{
	char buf[BUFSIZ];
	char *user;
	int i;

	oprintf("\n\tProbe Description Attributes\n");

	oprintf("\t\tIdentifier Names: %s\n",
	    dtrace_stability_name(p->dtp_attr.dtat_name));
	oprintf("\t\tData Semantics:   %s\n",
	    dtrace_stability_name(p->dtp_attr.dtat_data));
	oprintf("\t\tDependency Class: %s\n",
	    dtrace_class_name(p->dtp_attr.dtat_class));

	oprintf("\n\tArgument Attributes\n");

	oprintf("\t\tIdentifier Names: %s\n",
	    dtrace_stability_name(p->dtp_arga.dtat_name));
	oprintf("\t\tData Semantics:   %s\n",
	    dtrace_stability_name(p->dtp_arga.dtat_data));
	oprintf("\t\tDependency Class: %s\n",
	    dtrace_class_name(p->dtp_arga.dtat_class));

	oprintf("\n\tArgument Types\n");

	for (i = 0; i < p->dtp_argc; i++) {
		if (p->dtp_argv[i].dtt_flags & DTT_FL_USER)
			user = "userland ";
		else
			user = "";
		if (ctf_type_name(p->dtp_argv[i].dtt_ctfp,
		    p->dtp_argv[i].dtt_type, buf, sizeof (buf)) == NULL)
			(void) strlcpy(buf, "(unknown)", sizeof (buf));
		oprintf("\t\targs[%d]: %s%s\n", i, user, buf);
	}

	if (p->dtp_argc == 0)
		oprintf("\t\tNone\n");

	oprintf("\n");
}

/*ARGSUSED*/
static int
info_stmt(dtrace_hdl_t *dtp, dtrace_prog_t *pgp,
    dtrace_stmtdesc_t *stp, dtrace_ecbdesc_t **last)
{
	dtrace_ecbdesc_t *edp = stp->dtsd_ecbdesc;
	dtrace_probedesc_t *pdp = &edp->dted_probe;
	dtrace_probeinfo_t p;

	if (edp == *last)
		return (0);

	oprintf("\n%s:%s:%s:%s\n",
	    pdp->dtpd_provider, pdp->dtpd_mod, pdp->dtpd_func, pdp->dtpd_name);

	if (dtrace_probe_info(dtp, pdp, &p) == 0)
		print_probe_info(&p);

	*last = edp;
	return (0);
}

/*
 * Execute the specified program by enabling the corresponding instrumentation.
 * If -e has been specified, we get the program info but do not enable it.  If
 * -v has been specified, we print a stability report for the program.
 */
static void
exec_prog(const dtrace_cmd_t *dcp)
{
	dtrace_ecbdesc_t *last = NULL;
	dtrace_proginfo_t dpi;

	if (!g_exec) {
		dtrace_program_info(g_dtp, dcp->dc_prog, &dpi);
	} else if (dtrace_program_exec(g_dtp, dcp->dc_prog, &dpi) == -1) {
		dfatal("failed to enable '%s'", dcp->dc_name);
	} else {
		notice("%s '%s' matched %u probe%s\n",
		    dcp->dc_desc, dcp->dc_name,
		    dpi.dpi_matches, dpi.dpi_matches == 1 ? "" : "s");
	}

	if (g_verbose) {
		oprintf("\nStability attributes for %s %s:\n",
		    dcp->dc_desc, dcp->dc_name);

		oprintf("\n\tMinimum Probe Description Attributes\n");
		oprintf("\t\tIdentifier Names: %s\n",
		    dtrace_stability_name(dpi.dpi_descattr.dtat_name));
		oprintf("\t\tData Semantics:   %s\n",
		    dtrace_stability_name(dpi.dpi_descattr.dtat_data));
		oprintf("\t\tDependency Class: %s\n",
		    dtrace_class_name(dpi.dpi_descattr.dtat_class));

		oprintf("\n\tMinimum Statement Attributes\n");

		oprintf("\t\tIdentifier Names: %s\n",
		    dtrace_stability_name(dpi.dpi_stmtattr.dtat_name));
		oprintf("\t\tData Semantics:   %s\n",
		    dtrace_stability_name(dpi.dpi_stmtattr.dtat_data));
		oprintf("\t\tDependency Class: %s\n",
		    dtrace_class_name(dpi.dpi_stmtattr.dtat_class));

		if (!g_exec) {
			(void) dtrace_stmt_iter(g_dtp, dcp->dc_prog,
			    (dtrace_stmt_f *)info_stmt, &last);
		} else
			oprintf("\n");
	}

	g_total += dpi.dpi_matches;
}

/*
 * Print out the specified DOF buffer as a set of ASCII bytes appropriate for
 * storing in a driver.conf(4) file associated with the dtrace driver.
 */
static void
anon_prog(const dtrace_cmd_t *dcp, dof_hdr_t *dof, int n)
{
	const uchar_t *p, *q;

	if (dof == NULL)
		dfatal("failed to create DOF image for '%s'", dcp->dc_name);

	p = (uchar_t *)dof;
	q = p + dof->dofh_filesz;

#ifdef __FreeBSD__
	/*
	 * On FreeBSD, the DOF file is read directly during boot - just write
	 * two hex characters per byte.
	 */
	oprintf("dof-data-%d=", n);

	while (p < q)
		oprintf("%02x", *p++);

	oprintf("\n");
#else
	oprintf("dof-data-%d=0x%x", n, *p++);

	while (p < q)
		oprintf(",0x%x", *p++);

	oprintf(";\n");
#endif

	dtrace_dof_destroy(g_dtp, dof);
}

/*
 * Link the specified D program in DOF form into an ELF file for use in either
 * helpers, userland provider definitions, or both.  If -o was specified, that
 * path is used as the output file name.  If -o wasn't specified and the input
 * program is from a script whose name is %.d, use basename(%.o) as the output
 * file name.  Otherwise we use "d.out" as the default output file name.
 */
static void
link_prog(dtrace_cmd_t *dcp)
{
	char *p;

	if (g_cmdc == 1 && g_ofile != NULL) {
		(void) strlcpy(dcp->dc_ofile, g_ofile, sizeof (dcp->dc_ofile));
	} else if ((p = strrchr(dcp->dc_arg, '.')) != NULL &&
	    strcmp(p, ".d") == 0) {
		p[0] = '\0'; /* strip .d suffix */
		(void) snprintf(dcp->dc_ofile, sizeof (dcp->dc_ofile),
		    "%s.o", basename(dcp->dc_arg));
	} else if (g_cmdc > 1) {
		(void) snprintf(dcp->dc_ofile, sizeof (dcp->dc_ofile),
		    "d.out.%td", dcp - g_cmdv);
	} else {
		(void) snprintf(dcp->dc_ofile, sizeof (dcp->dc_ofile),
		    "d.out");
	}

	if (dtrace_program_link(g_dtp, dcp->dc_prog, DTRACE_D_PROBES,
	    dcp->dc_ofile, g_objc, g_objv) != 0)
		dfatal("failed to link %s %s", dcp->dc_desc, dcp->dc_name);
}

/*ARGSUSED*/
static int
list_probe(dtrace_hdl_t *dtp, const dtrace_probedesc_t *pdp, void *arg)
{
	dtrace_probeinfo_t p;

	oprintf("%5d %10s %17s %33s %s\n", pdp->dtpd_id,
	    pdp->dtpd_provider, pdp->dtpd_mod, pdp->dtpd_func, pdp->dtpd_name);

	if (g_verbose && dtrace_probe_info(dtp, pdp, &p) == 0)
		print_probe_info(&p);

	if (g_intr != 0)
		return (1);

	return (0);
}

/*ARGSUSED*/
static int
list_stmt(dtrace_hdl_t *dtp, dtrace_prog_t *pgp,
    dtrace_stmtdesc_t *stp, dtrace_ecbdesc_t **last)
{
	dtrace_ecbdesc_t *edp = stp->dtsd_ecbdesc;

	if (edp == *last)
		return (0);

	if (dtrace_probe_iter(g_dtp, &edp->dted_probe, list_probe, NULL) != 0) {
		error("failed to match %s:%s:%s:%s: %s\n",
		    edp->dted_probe.dtpd_provider, edp->dted_probe.dtpd_mod,
		    edp->dted_probe.dtpd_func, edp->dted_probe.dtpd_name,
		    dtrace_errmsg(dtp, dtrace_errno(dtp)));
	}

	*last = edp;
	return (0);
}

/*
 * List the probes corresponding to the specified program by iterating over
 * each statement and then matching probes to the statement probe descriptions.
 */
static void
list_prog(const dtrace_cmd_t *dcp)
{
	dtrace_ecbdesc_t *last = NULL;

	(void) dtrace_stmt_iter(g_dtp, dcp->dc_prog,
	    (dtrace_stmt_f *)list_stmt, &last);
}

static void
compile_file(dtrace_cmd_t *dcp)
{
	char *arg0;
	FILE *fp;

	if ((fp = fopen(dcp->dc_arg, "r")) == NULL)
		fatal("failed to open %s", dcp->dc_arg);

	arg0 = g_argv[0];
	g_argv[0] = dcp->dc_arg;

	if ((dcp->dc_prog = dtrace_program_fcompile(g_dtp, fp,
	    g_cflags, g_argc, g_argv)) == NULL)
		dfatal("failed to compile script %s", dcp->dc_arg);

	g_argv[0] = arg0;
	(void) fclose(fp);

	dcp->dc_desc = "script";
	dcp->dc_name = dcp->dc_arg;
}

static void
compile_str(dtrace_cmd_t *dcp)
{
	char *p;

	if ((dcp->dc_prog = dtrace_program_strcompile(g_dtp, dcp->dc_arg,
	    dcp->dc_spec, g_cflags | DTRACE_C_PSPEC, g_argc, g_argv)) == NULL)
		dfatal("invalid probe specifier %s", dcp->dc_arg);

	if ((p = strpbrk(dcp->dc_arg, "{/;")) != NULL)
		*p = '\0'; /* crop name for reporting */

	dcp->dc_desc = "description";
	dcp->dc_name = dcp->dc_arg;
}

/*ARGSUSED*/
static void
prochandler(struct ps_prochandle *P, const char *msg, void *arg)
{
#ifdef illumos
	const psinfo_t *prp = Ppsinfo(P);
	int pid = Pstatus(P)->pr_pid;
	char name[SIG2STR_MAX];
#else
	int wstatus = proc_getwstat(P);
	int pid = proc_getpid(P);
#endif

	if (msg != NULL) {
		notice("pid %d: %s\n", pid, msg);
		return;
	}

#ifdef illumos
	switch (Pstate(P)) {
#else
	switch (proc_state(P)) {
#endif
	case PS_UNDEAD:
#ifdef illumos
		/*
		 * Ideally we would like to always report pr_wstat here, but it
		 * isn't possible given current /proc semantics.  If we grabbed
		 * the process, Ppsinfo() will either fail or return a zeroed
		 * psinfo_t depending on how far the parent is in reaping it.
		 * When /proc provides a stable pr_wstat in the status file,
		 * this code can be improved by examining this new pr_wstat.
		 */
		if (prp != NULL && WIFSIGNALED(prp->pr_wstat)) {
			notice("pid %d terminated by %s\n", pid,
			    proc_signame(WTERMSIG(prp->pr_wstat),
			    name, sizeof (name)));
#else
		if (WIFSIGNALED(wstatus)) {
			notice("pid %d terminated by %d\n", pid,
			    WTERMSIG(wstatus));
#endif
#ifdef illumos
		} else if (prp != NULL && WEXITSTATUS(prp->pr_wstat) != 0) {
			notice("pid %d exited with status %d\n",
			    pid, WEXITSTATUS(prp->pr_wstat));
#else
		} else if (WEXITSTATUS(wstatus) != 0) {
			notice("pid %d exited with status %d\n",
			    pid, WEXITSTATUS(wstatus));
#endif
		} else {
			notice("pid %d has exited\n", pid);
		}
		g_pslive--;
		break;

	case PS_LOST:
		notice("pid %d exec'd a set-id or unobservable program\n", pid);
		g_pslive--;
		break;
	}
}

/*ARGSUSED*/
static int
errhandler(const dtrace_errdata_t *data, void *arg)
{
	error(data->dteda_msg);
	return (DTRACE_HANDLE_OK);
}

/*ARGSUSED*/
static int
drophandler(const dtrace_dropdata_t *data, void *arg)
{
	error(data->dtdda_msg);
	return (DTRACE_HANDLE_OK);
}

/*ARGSUSED*/
static int
setopthandler(const dtrace_setoptdata_t *data, void *arg)
{
	if (strcmp(data->dtsda_option, "quiet") == 0)
		g_quiet = data->dtsda_newval != DTRACEOPT_UNSET;

	if (strcmp(data->dtsda_option, "flowindent") == 0)
		g_flowindent = data->dtsda_newval != DTRACEOPT_UNSET;

	return (DTRACE_HANDLE_OK);
}

#define	BUFDUMPHDR(hdr) \
	(void) printf("%s: %s%s\n", g_pname, hdr, strlen(hdr) > 0 ? ":" : "");

#define	BUFDUMPSTR(ptr, field) \
	(void) printf("%s: %20s => ", g_pname, #field);	\
	if ((ptr)->field != NULL) {			\
		const char *c = (ptr)->field;		\
		(void) printf("\"");			\
		do {					\
			if (*c == '\n') {		\
				(void) printf("\\n");	\
				continue;		\
			}				\
							\
			(void) printf("%c", *c);	\
		} while (*c++ != '\0');			\
		(void) printf("\"\n");			\
	} else {					\
		(void) printf("<NULL>\n");		\
	}

#define	BUFDUMPASSTR(ptr, field, str) \
	(void) printf("%s: %20s => %s\n", g_pname, #field, str);

#define	BUFDUMP(ptr, field) \
	(void) printf("%s: %20s => %lld\n", g_pname, #field, \
	    (long long)(ptr)->field);

#define	BUFDUMPPTR(ptr, field) \
	(void) printf("%s: %20s => %s\n", g_pname, #field, \
	    (ptr)->field != NULL ? "<non-NULL>" : "<NULL>");

/*ARGSUSED*/
static int
bufhandler(const dtrace_bufdata_t *bufdata, void *arg)
{
	const dtrace_aggdata_t *agg = bufdata->dtbda_aggdata;
	const dtrace_recdesc_t *rec = bufdata->dtbda_recdesc;
	const dtrace_probedesc_t *pd;
	uint32_t flags = bufdata->dtbda_flags;
	char buf[512], *c = buf, *end = c + sizeof (buf);
	int i, printed;

	struct {
		const char *name;
		uint32_t value;
	} flagnames[] = {
	    { "AGGVAL",		DTRACE_BUFDATA_AGGVAL },
	    { "AGGKEY",		DTRACE_BUFDATA_AGGKEY },
	    { "AGGFORMAT",	DTRACE_BUFDATA_AGGFORMAT },
	    { "AGGLAST",	DTRACE_BUFDATA_AGGLAST },
	    { "???",		UINT32_MAX },
	    { NULL }
	};

	if (bufdata->dtbda_probe != NULL) {
		pd = bufdata->dtbda_probe->dtpda_pdesc;
	} else if (agg != NULL) {
		pd = agg->dtada_pdesc;
	} else {
		pd = NULL;
	}

	BUFDUMPHDR(">>> Called buffer handler");
	BUFDUMPHDR("");

	BUFDUMPHDR("  dtrace_bufdata");
	BUFDUMPSTR(bufdata, dtbda_buffered);
	BUFDUMPPTR(bufdata, dtbda_probe);
	BUFDUMPPTR(bufdata, dtbda_aggdata);
	BUFDUMPPTR(bufdata, dtbda_recdesc);

	(void) snprintf(c, end - c, "0x%x ", bufdata->dtbda_flags);
	c += strlen(c);

	for (i = 0, printed = 0; flagnames[i].name != NULL; i++) {
		if (!(flags & flagnames[i].value))
			continue;

		(void) snprintf(c, end - c,
		    "%s%s", printed++ ? " | " : "(", flagnames[i].name);
		c += strlen(c);
		flags &= ~flagnames[i].value;
	}

	if (printed)
		(void) snprintf(c, end - c, ")");

	BUFDUMPASSTR(bufdata, dtbda_flags, buf);
	BUFDUMPHDR("");

	if (pd != NULL) {
		BUFDUMPHDR("  dtrace_probedesc");
		BUFDUMPSTR(pd, dtpd_provider);
		BUFDUMPSTR(pd, dtpd_mod);
		BUFDUMPSTR(pd, dtpd_func);
		BUFDUMPSTR(pd, dtpd_name);
		BUFDUMPHDR("");
	}

	if (rec != NULL) {
		BUFDUMPHDR("  dtrace_recdesc");
		BUFDUMP(rec, dtrd_action);
		BUFDUMP(rec, dtrd_size);

		if (agg != NULL) {
			uint8_t *data;
			int lim = rec->dtrd_size;

			(void) sprintf(buf, "%d (data: ", rec->dtrd_offset);
			c = buf + strlen(buf);

			if (lim > sizeof (uint64_t))
				lim = sizeof (uint64_t);

			data = (uint8_t *)agg->dtada_data + rec->dtrd_offset;

			for (i = 0; i < lim; i++) {
				(void) snprintf(c, end - c, "%s%02x",
				    i == 0 ? "" : " ", *data++);
				c += strlen(c);
			}

			(void) snprintf(c, end - c,
			    "%s)", lim < rec->dtrd_size ? " ..." : "");
			BUFDUMPASSTR(rec, dtrd_offset, buf);
		} else {
			BUFDUMP(rec, dtrd_offset);
		}

		BUFDUMPHDR("");
	}

	if (agg != NULL) {
		dtrace_aggdesc_t *desc = agg->dtada_desc;

		BUFDUMPHDR("  dtrace_aggdesc");
		BUFDUMPSTR(desc, dtagd_name);
		BUFDUMP(desc, dtagd_varid);
		BUFDUMP(desc, dtagd_id);
		BUFDUMP(desc, dtagd_nrecs);
		BUFDUMPHDR("");
	}

	return (DTRACE_HANDLE_OK);
}

/*ARGSUSED*/
static int
chewrec(const dtrace_probedata_t *data, const dtrace_recdesc_t *rec, void *arg)
{
	dtrace_actkind_t act;
	uintptr_t addr;

	if (rec == NULL) {
		/*
		 * We have processed the final record; output the newline if
		 * we're not in quiet mode.
		 */
		if (!g_quiet)
			oprintf("\n");

		return (DTRACE_CONSUME_NEXT);
	}

	act = rec->dtrd_action;
	addr = (uintptr_t)data->dtpda_data;

	if (act == DTRACEACT_EXIT) {
		g_status = *((uint32_t *)addr);
		return (DTRACE_CONSUME_NEXT);
	}

	return (DTRACE_CONSUME_THIS);
}

/*ARGSUSED*/
static int
chew(const dtrace_probedata_t *data, void *arg)
{
	dtrace_probedesc_t *pd = data->dtpda_pdesc;
	processorid_t cpu = data->dtpda_cpu;
	static int heading;

	if (g_impatient) {
		g_newline = 0;
		return (DTRACE_CONSUME_ABORT);
	}

	if (heading == 0) {
		if (!g_flowindent) {
			if (!g_quiet) {
				oprintf("%3s %6s %32s\n",
				    "CPU", "ID", "FUNCTION:NAME");
			}
		} else {
			oprintf("%3s %-41s\n", "CPU", "FUNCTION");
		}
		heading = 1;
	}

	if (!g_flowindent) {
		if (!g_quiet) {
			char name[DTRACE_FUNCNAMELEN + DTRACE_NAMELEN + 2];

			(void) snprintf(name, sizeof (name), "%s:%s",
			    pd->dtpd_func, pd->dtpd_name);

			oprintf("%3d %6d %32s ", cpu, pd->dtpd_id, name);
		}
	} else {
		int indent = data->dtpda_indent;
		char *name;
		size_t len;

		if (data->dtpda_flow == DTRACEFLOW_NONE) {
			len = indent + DTRACE_FUNCNAMELEN + DTRACE_NAMELEN + 5;
			name = alloca(len);
			(void) snprintf(name, len, "%*s%s%s:%s", indent, "",
			    data->dtpda_prefix, pd->dtpd_func,
			    pd->dtpd_name);
		} else {
			len = indent + DTRACE_FUNCNAMELEN + 5;
			name = alloca(len);
			(void) snprintf(name, len, "%*s%s%s", indent, "",
			    data->dtpda_prefix, pd->dtpd_func);
		}

		oprintf("%3d %-41s ", cpu, name);
	}

	return (DTRACE_CONSUME_THIS);
}

static void
go(void)
{
	int i;

	struct {
		char *name;
		char *optname;
		dtrace_optval_t val;
	} bufs[] = {
		{ "buffer size", "bufsize" },
		{ "aggregation size", "aggsize" },
		{ "speculation size", "specsize" },
		{ "dynamic variable size", "dynvarsize" },
		{ NULL }
	}, rates[] = {
		{ "cleaning rate", "cleanrate" },
		{ "status rate", "statusrate" },
		{ NULL }
	};

	for (i = 0; bufs[i].name != NULL; i++) {
		if (dtrace_getopt(g_dtp, bufs[i].optname, &bufs[i].val) == -1)
			fatal("couldn't get option %s", bufs[i].optname);
	}

	for (i = 0; rates[i].name != NULL; i++) {
		if (dtrace_getopt(g_dtp, rates[i].optname, &rates[i].val) == -1)
			fatal("couldn't get option %s", rates[i].optname);
	}

	if (dtrace_go(g_dtp) == -1)
		dfatal("could not enable tracing");

	for (i = 0; bufs[i].name != NULL; i++) {
		dtrace_optval_t j = 0, mul = 10;
		dtrace_optval_t nsize;

		if (bufs[i].val == DTRACEOPT_UNSET)
			continue;

		(void) dtrace_getopt(g_dtp, bufs[i].optname, &nsize);

		if (nsize == DTRACEOPT_UNSET || nsize == 0)
			continue;

		if (nsize >= bufs[i].val - sizeof (uint64_t))
			continue;

		for (; (INT64_C(1) << mul) <= nsize; j++, mul += 10)
			continue;

		if (!(nsize & ((INT64_C(1) << (mul - 10)) - 1))) {
			error("%s lowered to %lld%c\n", bufs[i].name,
			    (long long)nsize >> (mul - 10), " kmgtpe"[j]);
		} else {
			error("%s lowered to %lld bytes\n", bufs[i].name,
			    (long long)nsize);
		}
	}

	for (i = 0; rates[i].name != NULL; i++) {
		dtrace_optval_t nval;
		char *dir;

		if (rates[i].val == DTRACEOPT_UNSET)
			continue;

		(void) dtrace_getopt(g_dtp, rates[i].optname, &nval);

		if (nval == DTRACEOPT_UNSET || nval == 0)
			continue;

		if (rates[i].val == nval)
			continue;

		dir = nval > rates[i].val ? "reduced" : "increased";

		if (nval <= NANOSEC && (NANOSEC % nval) == 0) {
			error("%s %s to %lld hz\n", rates[i].name, dir,
			    (long long)NANOSEC / (long long)nval);
			continue;
		}

		if ((nval % NANOSEC) == 0) {
			error("%s %s to once every %lld seconds\n",
			    rates[i].name, dir,
			    (long long)nval / (long long)NANOSEC);
			continue;
		}

		error("%s %s to once every %lld nanoseconds\n",
		    rates[i].name, dir, (long long)nval);
	}
}

/*ARGSUSED*/
static void
intr(int signo)
{
	if (!g_intr)
		g_newline = 1;

	if (g_intr++)
		g_impatient = 1;
}

#ifdef __FreeBSD__
static void
siginfo(int signo __unused)
{

	g_siginfo++;
	g_newline = 1;
}
#endif

static void
installsighands(void)
{
	struct sigaction act, oact;

	(void) sigemptyset(&act.sa_mask);
	act.sa_flags = 0;
	act.sa_handler = intr;

	if (sigaction(SIGINT, NULL, &oact) == 0 && oact.sa_handler != SIG_IGN)
		(void) sigaction(SIGINT, &act, NULL);

	if (sigaction(SIGTERM, NULL, &oact) == 0 && oact.sa_handler != SIG_IGN)
		(void) sigaction(SIGTERM, &act, NULL);

#ifdef __FreeBSD__
	if (sigaction(SIGPIPE, NULL, &oact) == 0 && oact.sa_handler != SIG_IGN)
		(void) sigaction(SIGPIPE, &act, NULL);

	if (sigaction(SIGUSR1, NULL, &oact) == 0 && oact.sa_handler != SIG_IGN)
		(void) sigaction(SIGUSR1, &act, NULL);

	act.sa_handler = siginfo;
	if (sigaction(SIGINFO, NULL, &oact) == 0 && oact.sa_handler != SIG_IGN)
		(void) sigaction(SIGINFO, &act, NULL);
#endif
}

int
main(int argc, char *argv[])
{
	dtrace_bufdesc_t buf;
	dtrace_status_t status[2];
	dtrace_optval_t opt;
	dtrace_cmd_t *dcp;

	g_ofp = stdout;
	int done = 0, mode = 0;
	int err, i, c;
	char *p, **v;
	struct ps_prochandle *P;
	pid_t pid;

	g_pname = basename(argv[0]);

	if (argc == 1)
		return (usage(stderr));

	if ((g_argv = malloc(sizeof (char *) * argc)) == NULL ||
	    (g_cmdv = malloc(sizeof (dtrace_cmd_t) * argc)) == NULL ||
	    (g_psv = malloc(sizeof (struct ps_prochandle *) * argc)) == NULL)
		fatal("failed to allocate memory for arguments");

	g_argv[g_argc++] = argv[0];	/* propagate argv[0] to D as $0/$$0 */
	argv[0] = g_pname;		/* rewrite argv[0] for getopt errors */

	bzero(status, sizeof (status));
	bzero(&buf, sizeof (buf));

	/*
	 * Make an initial pass through argv[] processing any arguments that
	 * affect our behavior mode (g_mode) and flags used for dtrace_open().
	 * We also accumulate arguments that are not affiliated with getopt
	 * options into g_argv[], and abort if any invalid options are found.
	 */
	for (optind = 1; optind < argc; optind++) {
		while ((c = getopt(argc, argv, DTRACE_OPTSTR)) != -1) {
			switch (c) {
			case '3':
				if (strcmp(optarg, "2") != 0) {
					(void) fprintf(stderr,
					    "%s: illegal option -- 3%s\n",
					    argv[0], optarg);
					return (usage(stderr));
				}
				g_oflags &= ~DTRACE_O_LP64;
				g_oflags |= DTRACE_O_ILP32;
				break;

			case '6':
				if (strcmp(optarg, "4") != 0) {
					(void) fprintf(stderr,
					    "%s: illegal option -- 6%s\n",
					    argv[0], optarg);
					return (usage(stderr));
				}
				g_oflags &= ~DTRACE_O_ILP32;
				g_oflags |= DTRACE_O_LP64;
				break;

			case 'a':
				g_grabanon++; /* also checked in pass 2 below */
				break;

			case 'A':
				g_mode = DMODE_ANON;
				g_exec = 0;
				mode++;
				break;

			case 'e':
				g_exec = 0;
				done = 1;
				break;

			case 'h':
				g_mode = DMODE_HEADER;
				g_oflags |= DTRACE_O_NODEV;
				g_cflags |= DTRACE_C_ZDEFS; /* -h implies -Z */
				g_exec = 0;
				mode++;
				break;

			case 'G':
				g_mode = DMODE_LINK;
				g_oflags |= DTRACE_O_NODEV;
				g_cflags |= DTRACE_C_ZDEFS; /* -G implies -Z */
				g_exec = 0;
				mode++;
				break;

			case 'l':
				g_mode = DMODE_LIST;
				g_cflags |= DTRACE_C_ZDEFS; /* -l implies -Z */
				mode++;
				break;

			case 'V':
				g_mode = DMODE_VERS;
				mode++;
				break;

			default:
				if (strchr(DTRACE_OPTSTR, c) == NULL)
					return (usage(stderr));
			}
		}

		if (optind < argc)
			g_argv[g_argc++] = argv[optind];
	}

	if (mode > 1) {
		(void) fprintf(stderr, "%s: only one of the [-AGhlV] options "
		    "can be specified at a time\n", g_pname);
		return (E_USAGE);
	}

	if (g_mode == DMODE_VERS)
		return (printf("%s: %s\n", g_pname, _dtrace_version) <= 0);

	/*
	 * If we're in linker mode and the data model hasn't been specified,
	 * we try to guess the appropriate setting by examining the object
	 * files. We ignore certain errors since we'll catch them later when
	 * we actually process the object files.
	 */
	if (g_mode == DMODE_LINK &&
	    (g_oflags & (DTRACE_O_ILP32 | DTRACE_O_LP64)) == 0 &&
	    elf_version(EV_CURRENT) != EV_NONE) {
		int fd;
		Elf *elf;
		GElf_Ehdr ehdr;

		for (i = 1; i < g_argc; i++) {
			if ((fd = open64(g_argv[i], O_RDONLY)) == -1)
				break;

			if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
				(void) close(fd);
				break;
			}

			if (elf_kind(elf) != ELF_K_ELF ||
			    gelf_getehdr(elf, &ehdr) == NULL) {
				(void) close(fd);
				(void) elf_end(elf);
				break;
			}

			(void) close(fd);
			(void) elf_end(elf);

			if (ehdr.e_ident[EI_CLASS] == ELFCLASS64) {
				if (g_oflags & DTRACE_O_ILP32) {
					fatal("can't mix 32-bit and 64-bit "
					    "object files\n");
				}
				g_oflags |= DTRACE_O_LP64;
			} else if (ehdr.e_ident[EI_CLASS] == ELFCLASS32) {
				if (g_oflags & DTRACE_O_LP64) {
					fatal("can't mix 32-bit and 64-bit "
					    "object files\n");
				}
				g_oflags |= DTRACE_O_ILP32;
			} else {
				break;
			}
		}
	}

	/*
	 * Open libdtrace.  If we are not actually going to be enabling any
	 * instrumentation attempt to reopen libdtrace using DTRACE_O_NODEV.
	 */
	while ((g_dtp = dtrace_open(DTRACE_VERSION, g_oflags, &err)) == NULL) {
		if (!(g_oflags & DTRACE_O_NODEV) && !g_exec && !g_grabanon) {
			g_oflags |= DTRACE_O_NODEV;
			continue;
		}

		fatal("failed to initialize dtrace: %s\n",
		    dtrace_errmsg(NULL, err));
	}

#if defined(__i386__)
	/* XXX The 32-bit seems to need more buffer space by default -sson */
	(void) dtrace_setopt(g_dtp, "bufsize", "12m");
	(void) dtrace_setopt(g_dtp, "aggsize", "12m");
#else
	(void) dtrace_setopt(g_dtp, "bufsize", "4m");
	(void) dtrace_setopt(g_dtp, "aggsize", "4m");
#endif
	(void) dtrace_setopt(g_dtp, "temporal", "yes");

	/*
	 * If -G is specified, enable -xlink=dynamic and -xunodefs to permit
	 * references to undefined symbols to remain as unresolved relocations.
	 * If -A is specified, enable -xlink=primary to permit static linking
	 * only to kernel symbols that are defined in a primary kernel module.
	 */
	if (g_mode == DMODE_LINK) {
		(void) dtrace_setopt(g_dtp, "linkmode", "dynamic");
		(void) dtrace_setopt(g_dtp, "unodefs", NULL);

		/*
		 * Use the remaining arguments as the list of object files
		 * when in linker mode.
		 */
		g_objc = g_argc - 1;
		g_objv = g_argv + 1;

		/*
		 * We still use g_argv[0], the name of the executable.
		 */
		g_argc = 1;
	} else if (g_mode == DMODE_ANON)
		(void) dtrace_setopt(g_dtp, "linkmode", "primary");

	/*
	 * Now that we have libdtrace open, make a second pass through argv[]
	 * to perform any dtrace_setopt() calls and change any compiler flags.
	 * We also accumulate any program specifications into our g_cmdv[] at
	 * this time; these will compiled as part of the fourth processing pass.
	 */
	for (optind = 1; optind < argc; optind++) {
		while ((c = getopt(argc, argv, DTRACE_OPTSTR)) != -1) {
			switch (c) {
			case 'a':
				if (dtrace_setopt(g_dtp, "grabanon", 0) != 0)
					dfatal("failed to set -a");
				break;

			case 'b':
				if (dtrace_setopt(g_dtp,
				    "bufsize", optarg) != 0)
					dfatal("failed to set -b %s", optarg);
				break;

			case 'B':
				g_ofp = NULL;
				break;

			case 'C':
				g_cflags |= DTRACE_C_CPP;
				break;

			case 'D':
				if (dtrace_setopt(g_dtp, "define", optarg) != 0)
					dfatal("failed to set -D %s", optarg);
				break;

			case 'f':
				dcp = &g_cmdv[g_cmdc++];
				dcp->dc_func = compile_str;
				dcp->dc_spec = DTRACE_PROBESPEC_FUNC;
				dcp->dc_arg = optarg;
				break;

			case 'F':
				if (dtrace_setopt(g_dtp, "flowindent", 0) != 0)
					dfatal("failed to set -F");
				break;

			case 'H':
				if (dtrace_setopt(g_dtp, "cpphdrs", 0) != 0)
					dfatal("failed to set -H");
				break;

			case 'i':
				dcp = &g_cmdv[g_cmdc++];
				dcp->dc_func = compile_str;
				dcp->dc_spec = DTRACE_PROBESPEC_NAME;
				dcp->dc_arg = optarg;
				break;

			case 'I':
				if (dtrace_setopt(g_dtp, "incdir", optarg) != 0)
					dfatal("failed to set -I %s", optarg);
				break;

			case 'L':
				if (dtrace_setopt(g_dtp, "libdir", optarg) != 0)
					dfatal("failed to set -L %s", optarg);
				break;

			case 'm':
				dcp = &g_cmdv[g_cmdc++];
				dcp->dc_func = compile_str;
				dcp->dc_spec = DTRACE_PROBESPEC_MOD;
				dcp->dc_arg = optarg;
				break;

			case 'n':
				dcp = &g_cmdv[g_cmdc++];
				dcp->dc_func = compile_str;
				dcp->dc_spec = DTRACE_PROBESPEC_NAME;
				dcp->dc_arg = optarg;
				break;

			case 'P':
				dcp = &g_cmdv[g_cmdc++];
				dcp->dc_func = compile_str;
				dcp->dc_spec = DTRACE_PROBESPEC_PROVIDER;
				dcp->dc_arg = optarg;
				break;

			case 'q':
				if (dtrace_setopt(g_dtp, "quiet", 0) != 0)
					dfatal("failed to set -q");
				break;

			case 'o':
				g_ofile = optarg;
				break;

			case 's':
				dcp = &g_cmdv[g_cmdc++];
				dcp->dc_func = compile_file;
				dcp->dc_spec = DTRACE_PROBESPEC_NONE;
				dcp->dc_arg = optarg;
				break;

			case 'S':
				g_cflags |= DTRACE_C_DIFV;
				break;

			case 'U':
				if (dtrace_setopt(g_dtp, "undef", optarg) != 0)
					dfatal("failed to set -U %s", optarg);
				break;

			case 'v':
				g_verbose++;
				break;

			case 'w':
				if (dtrace_setopt(g_dtp, "destructive", 0) != 0)
					dfatal("failed to set -w");
				break;

			case 'x':
				if ((p = strchr(optarg, '=')) != NULL)
					*p++ = '\0';

				if (dtrace_setopt(g_dtp, optarg, p) != 0)
					dfatal("failed to set -x %s", optarg);
				break;

			case 'X':
				if (dtrace_setopt(g_dtp, "stdc", optarg) != 0)
					dfatal("failed to set -X %s", optarg);
				break;

			case 'Z':
				g_cflags |= DTRACE_C_ZDEFS;
				break;

			default:
				if (strchr(DTRACE_OPTSTR, c) == NULL)
					return (usage(stderr));
			}
		}
	}

	if (g_ofp == NULL && g_mode != DMODE_EXEC) {
		(void) fprintf(stderr, "%s: -B not valid in combination"
		    " with [-AGl] options\n", g_pname);
		return (E_USAGE);
	}

	if (g_ofp == NULL && g_ofile != NULL) {
		(void) fprintf(stderr, "%s: -B not valid in combination"
		    " with -o option\n", g_pname);
		return (E_USAGE);
	}

	/*
	 * In our third pass we handle any command-line options related to
	 * grabbing or creating victim processes.  The behavior of these calls
	 * may been affected by any library options set by the second pass.
	 */
	for (optind = 1; optind < argc; optind++) {
		while ((c = getopt(argc, argv, DTRACE_OPTSTR)) != -1) {
			switch (c) {
			case 'c':
				if ((v = make_argv(optarg)) == NULL)
					fatal("failed to allocate memory");

				P = dtrace_proc_create(g_dtp, v[0], v, NULL, NULL);
				if (P == NULL)
					dfatal(NULL); /* dtrace_errmsg() only */

				g_psv[g_psc++] = P;
				free(v);
				break;

			case 'p':
				errno = 0;
				pid = strtol(optarg, &p, 10);

				if (errno != 0 || p == optarg || p[0] != '\0')
					fatal("invalid pid: %s\n", optarg);

				P = dtrace_proc_grab(g_dtp, pid, 0);
				if (P == NULL)
					dfatal(NULL); /* dtrace_errmsg() only */

				g_psv[g_psc++] = P;
				break;
			}
		}
	}

	/*
	 * In our fourth pass we finish g_cmdv[] by calling dc_func to convert
	 * each string or file specification into a compiled program structure.
	 */
	for (i = 0; i < g_cmdc; i++)
		g_cmdv[i].dc_func(&g_cmdv[i]);

	if (g_mode != DMODE_LIST) {
		if (dtrace_handle_err(g_dtp, &errhandler, NULL) == -1)
			dfatal("failed to establish error handler");

		if (dtrace_handle_drop(g_dtp, &drophandler, NULL) == -1)
			dfatal("failed to establish drop handler");

		if (dtrace_handle_proc(g_dtp, &prochandler, NULL) == -1)
			dfatal("failed to establish proc handler");

		if (dtrace_handle_setopt(g_dtp, &setopthandler, NULL) == -1)
			dfatal("failed to establish setopt handler");

		if (g_ofp == NULL &&
		    dtrace_handle_buffered(g_dtp, &bufhandler, NULL) == -1)
			dfatal("failed to establish buffered handler");
	}

	(void) dtrace_getopt(g_dtp, "flowindent", &opt);
	g_flowindent = opt != DTRACEOPT_UNSET;

	(void) dtrace_getopt(g_dtp, "grabanon", &opt);
	g_grabanon = opt != DTRACEOPT_UNSET;

	(void) dtrace_getopt(g_dtp, "quiet", &opt);
	g_quiet = opt != DTRACEOPT_UNSET;

	/*
	 * Now make a fifth and final pass over the options that have been
	 * turned into programs and saved in g_cmdv[], performing any mode-
	 * specific processing.  If g_mode is DMODE_EXEC, we will break out
	 * of the switch() and continue on to the data processing loop.  For
	 * other modes, we will exit dtrace once mode-specific work is done.
	 */
	switch (g_mode) {
	case DMODE_EXEC:
		if (g_ofile != NULL && (g_ofp = fopen(g_ofile, "a")) == NULL)
			fatal("failed to open output file '%s'", g_ofile);

		for (i = 0; i < g_cmdc; i++)
			exec_prog(&g_cmdv[i]);

		if (done && !g_grabanon) {
			dtrace_close(g_dtp);
			return (g_status);
		}
		break;

	case DMODE_ANON:
		if (g_ofile == NULL)
#ifdef illumos
			g_ofile = "/kernel/drv/dtrace.conf";
#else
			/*
			 * On FreeBSD, anonymous DOF data is written to
			 * the DTrace DOF file.
			 */
			g_ofile = "/boot/dtrace.dof";
#endif

		dof_prune(g_ofile); /* strip out any old DOF directives */
#ifdef illumos
		etcsystem_prune(); /* string out any forceload directives */
#endif

		if (g_cmdc == 0) {
			dtrace_close(g_dtp);
			return (g_status);
		}

		if ((g_ofp = fopen(g_ofile, "a")) == NULL)
			fatal("failed to open output file '%s'", g_ofile);

		for (i = 0; i < g_cmdc; i++) {
			anon_prog(&g_cmdv[i],
			    dtrace_dof_create(g_dtp, g_cmdv[i].dc_prog, 0), i);
		}

		/*
		 * Dump out the DOF corresponding to the error handler and the
		 * current options as the final DOF property in the .conf file.
		 */
		anon_prog(NULL, dtrace_geterr_dof(g_dtp), i++);
		anon_prog(NULL, dtrace_getopt_dof(g_dtp), i++);

		if (fclose(g_ofp) == EOF)
			fatal("failed to close output file '%s'", g_ofile);

		/*
		 * These messages would use notice() rather than error(), but
		 * we don't want them suppressed when -A is run on a D program
		 * that itself contains a #pragma D option quiet.
		 */
		error("saved anonymous enabling in %s\n", g_ofile);

#ifdef __FreeBSD__
		bootdof_add();
#else
		etcsystem_add();
		error("run update_drv(1M) or reboot to enable changes\n");
#endif

		dtrace_close(g_dtp);
		return (g_status);

	case DMODE_LINK:
		if (g_cmdc == 0) {
			(void) fprintf(stderr, "%s: -G requires one or more "
			    "scripts or enabling options\n", g_pname);
			dtrace_close(g_dtp);
			return (E_USAGE);
		}

		for (i = 0; i < g_cmdc; i++)
			link_prog(&g_cmdv[i]);

		if (g_cmdc > 1 && g_ofile != NULL) {
			char **objv = alloca(g_cmdc * sizeof (char *));

			for (i = 0; i < g_cmdc; i++)
				objv[i] = g_cmdv[i].dc_ofile;

			if (dtrace_program_link(g_dtp, NULL, DTRACE_D_PROBES,
			    g_ofile, g_cmdc, objv) != 0)
				dfatal(NULL); /* dtrace_errmsg() only */
		}

		dtrace_close(g_dtp);
		return (g_status);

	case DMODE_LIST:
		if (g_ofile != NULL && (g_ofp = fopen(g_ofile, "a")) == NULL)
			fatal("failed to open output file '%s'", g_ofile);

		installsighands();

		oprintf("%5s %10s %17s %33s %s\n",
		    "ID", "PROVIDER", "MODULE", "FUNCTION", "NAME");

		for (i = 0; i < g_cmdc; i++)
			list_prog(&g_cmdv[i]);

		if (g_cmdc == 0)
			(void) dtrace_probe_iter(g_dtp, NULL, list_probe, NULL);

		dtrace_close(g_dtp);
		return (g_status);

	case DMODE_HEADER:
		if (g_cmdc == 0) {
			(void) fprintf(stderr, "%s: -h requires one or more "
			    "scripts or enabling options\n", g_pname);
			dtrace_close(g_dtp);
			return (E_USAGE);
		}

		if (g_ofile == NULL) {
			char *p;

			if (g_cmdc > 1) {
				(void) fprintf(stderr, "%s: -h requires an "
				    "output file if multiple scripts are "
				    "specified\n", g_pname);
				dtrace_close(g_dtp);
				return (E_USAGE);
			}

			if ((p = strrchr(g_cmdv[0].dc_arg, '.')) == NULL ||
			    strcmp(p, ".d") != 0) {
				(void) fprintf(stderr, "%s: -h requires an "
				    "output file if no scripts are "
				    "specified\n", g_pname);
				dtrace_close(g_dtp);
				return (E_USAGE);
			}

			p[0] = '\0'; /* strip .d suffix */
			g_ofile = p = g_cmdv[0].dc_ofile;
			(void) snprintf(p, sizeof (g_cmdv[0].dc_ofile),
			    "%s.h", basename(g_cmdv[0].dc_arg));
		}

		if ((g_ofp = fopen(g_ofile, "w")) == NULL)
			fatal("failed to open header file '%s'", g_ofile);

		oprintf("/*\n * Generated by dtrace(1M).\n */\n\n");

		if (dtrace_program_header(g_dtp, g_ofp, g_ofile) != 0 ||
		    fclose(g_ofp) == EOF)
			dfatal("failed to create header file %s", g_ofile);

		dtrace_close(g_dtp);
		return (g_status);
	}

	/*
	 * If -a and -Z were not specified and no probes have been matched, no
	 * probe criteria was specified on the command line and we abort.
	 */
	if (g_total == 0 && !g_grabanon && !(g_cflags & DTRACE_C_ZDEFS))
		dfatal("no probes %s\n", g_cmdc ? "matched" : "specified");

	/*
	 * Start tracing.  Once we dtrace_go(), reload any options that affect
	 * our globals in case consuming anonymous state has changed them.
	 */
	go();

	(void) dtrace_getopt(g_dtp, "flowindent", &opt);
	g_flowindent = opt != DTRACEOPT_UNSET;

	(void) dtrace_getopt(g_dtp, "grabanon", &opt);
	g_grabanon = opt != DTRACEOPT_UNSET;

	(void) dtrace_getopt(g_dtp, "quiet", &opt);
	g_quiet = opt != DTRACEOPT_UNSET;

	(void) dtrace_getopt(g_dtp, "destructive", &opt);
	if (opt != DTRACEOPT_UNSET)
		notice("allowing destructive actions\n");

	installsighands();

	/*
	 * Now that tracing is active and we are ready to consume trace data,
	 * continue any grabbed or created processes, setting them running
	 * using the /proc control mechanism inside of libdtrace.
	 */
	for (i = 0; i < g_psc; i++)
		dtrace_proc_continue(g_dtp, g_psv[i]);

	g_pslive = g_psc; /* count for prochandler() */

	do {
		if (!g_intr && !done)
			dtrace_sleep(g_dtp);

#ifdef __FreeBSD__
		if (g_siginfo) {
			(void)dtrace_aggregate_print(g_dtp, g_ofp, NULL);
			g_siginfo = 0;
		}
#endif

		if (g_newline) {
			/*
			 * Output a newline just to make the output look
			 * slightly cleaner.  Note that we do this even in
			 * "quiet" mode...
			 */
			oprintf("\n");
			g_newline = 0;
		}

		if (done || g_intr || (g_psc != 0 && g_pslive == 0)) {
			done = 1;
			if (dtrace_stop(g_dtp) == -1)
				dfatal("couldn't stop tracing");
		}

		switch (dtrace_work(g_dtp, g_ofp, chew, chewrec, NULL)) {
		case DTRACE_WORKSTATUS_DONE:
			done = 1;
			break;
		case DTRACE_WORKSTATUS_OKAY:
			break;
		default:
			if (!g_impatient && dtrace_errno(g_dtp) != EINTR)
				dfatal("processing aborted");
		}

		if (g_ofp != NULL && fflush(g_ofp) == EOF)
			clearerr(g_ofp);
	} while (!done);

	oprintf("\n");

	if (!g_impatient) {
		if (dtrace_aggregate_print(g_dtp, g_ofp, NULL) == -1 &&
		    dtrace_errno(g_dtp) != EINTR)
			dfatal("failed to print aggregations");
	}

	dtrace_close(g_dtp);
	return (g_status);
}