| Current Path : /usr/src/cddl/contrib/opensolaris/lib/libdtrace/common/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/cddl/contrib/opensolaris/lib/libdtrace/common/dt_provider.c |
/*
* 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.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#if defined(sun)
#include <sys/sysmacros.h>
#endif
#include <assert.h>
#include <limits.h>
#include <strings.h>
#include <stdlib.h>
#if defined(sun)
#include <alloca.h>
#endif
#include <unistd.h>
#include <errno.h>
#include <dt_provider.h>
#include <dt_module.h>
#include <dt_string.h>
#include <dt_list.h>
static dt_provider_t *
dt_provider_insert(dtrace_hdl_t *dtp, dt_provider_t *pvp, uint_t h)
{
dt_list_append(&dtp->dt_provlist, pvp);
pvp->pv_next = dtp->dt_provs[h];
dtp->dt_provs[h] = pvp;
dtp->dt_nprovs++;
return (pvp);
}
dt_provider_t *
dt_provider_lookup(dtrace_hdl_t *dtp, const char *name)
{
uint_t h = dt_strtab_hash(name, NULL) % dtp->dt_provbuckets;
dtrace_providerdesc_t desc;
dt_provider_t *pvp;
for (pvp = dtp->dt_provs[h]; pvp != NULL; pvp = pvp->pv_next) {
if (strcmp(pvp->pv_desc.dtvd_name, name) == 0)
return (pvp);
}
if (strisglob(name) || name[0] == '\0') {
(void) dt_set_errno(dtp, EDT_NOPROV);
return (NULL);
}
bzero(&desc, sizeof (desc));
(void) strlcpy(desc.dtvd_name, name, DTRACE_PROVNAMELEN);
if (dt_ioctl(dtp, DTRACEIOC_PROVIDER, &desc) == -1) {
(void) dt_set_errno(dtp, errno == ESRCH ? EDT_NOPROV : errno);
return (NULL);
}
if ((pvp = dt_provider_create(dtp, name)) == NULL)
return (NULL); /* dt_errno is set for us */
bcopy(&desc, &pvp->pv_desc, sizeof (desc));
pvp->pv_flags |= DT_PROVIDER_IMPL;
return (pvp);
}
dt_provider_t *
dt_provider_create(dtrace_hdl_t *dtp, const char *name)
{
dt_provider_t *pvp;
if ((pvp = dt_zalloc(dtp, sizeof (dt_provider_t))) == NULL)
return (NULL);
(void) strlcpy(pvp->pv_desc.dtvd_name, name, DTRACE_PROVNAMELEN);
pvp->pv_probes = dt_idhash_create(pvp->pv_desc.dtvd_name, NULL, 0, 0);
pvp->pv_gen = dtp->dt_gen;
pvp->pv_hdl = dtp;
if (pvp->pv_probes == NULL) {
dt_free(dtp, pvp);
(void) dt_set_errno(dtp, EDT_NOMEM);
return (NULL);
}
pvp->pv_desc.dtvd_attr.dtpa_provider = _dtrace_prvattr;
pvp->pv_desc.dtvd_attr.dtpa_mod = _dtrace_prvattr;
pvp->pv_desc.dtvd_attr.dtpa_func = _dtrace_prvattr;
pvp->pv_desc.dtvd_attr.dtpa_name = _dtrace_prvattr;
pvp->pv_desc.dtvd_attr.dtpa_args = _dtrace_prvattr;
return (dt_provider_insert(dtp, pvp,
dt_strtab_hash(name, NULL) % dtp->dt_provbuckets));
}
void
dt_provider_destroy(dtrace_hdl_t *dtp, dt_provider_t *pvp)
{
dt_provider_t **pp;
uint_t h;
assert(pvp->pv_hdl == dtp);
h = dt_strtab_hash(pvp->pv_desc.dtvd_name, NULL) % dtp->dt_provbuckets;
pp = &dtp->dt_provs[h];
while (*pp != NULL && *pp != pvp)
pp = &(*pp)->pv_next;
assert(*pp != NULL && *pp == pvp);
*pp = pvp->pv_next;
dt_list_delete(&dtp->dt_provlist, pvp);
dtp->dt_nprovs--;
if (pvp->pv_probes != NULL)
dt_idhash_destroy(pvp->pv_probes);
dt_node_link_free(&pvp->pv_nodes);
dt_free(dtp, pvp->pv_xrefs);
dt_free(dtp, pvp);
}
int
dt_provider_xref(dtrace_hdl_t *dtp, dt_provider_t *pvp, id_t id)
{
size_t oldsize = BT_SIZEOFMAP(pvp->pv_xrmax);
size_t newsize = BT_SIZEOFMAP(dtp->dt_xlatorid);
assert(id >= 0 && id < dtp->dt_xlatorid);
if (newsize > oldsize) {
ulong_t *xrefs = dt_zalloc(dtp, newsize);
if (xrefs == NULL)
return (-1);
bcopy(pvp->pv_xrefs, xrefs, oldsize);
dt_free(dtp, pvp->pv_xrefs);
pvp->pv_xrefs = xrefs;
pvp->pv_xrmax = dtp->dt_xlatorid;
}
BT_SET(pvp->pv_xrefs, id);
return (0);
}
static uint8_t
dt_probe_argmap(dt_node_t *xnp, dt_node_t *nnp)
{
uint8_t i;
for (i = 0; nnp != NULL; i++) {
if (nnp->dn_string != NULL &&
strcmp(nnp->dn_string, xnp->dn_string) == 0)
break;
else
nnp = nnp->dn_list;
}
return (i);
}
static dt_node_t *
dt_probe_alloc_args(dt_provider_t *pvp, int argc)
{
dt_node_t *args = NULL, *pnp = NULL, *dnp;
int i;
for (i = 0; i < argc; i++, pnp = dnp) {
if ((dnp = dt_node_xalloc(pvp->pv_hdl, DT_NODE_TYPE)) == NULL)
return (NULL);
dnp->dn_link = pvp->pv_nodes;
pvp->pv_nodes = dnp;
if (args == NULL)
args = dnp;
else
pnp->dn_list = dnp;
}
return (args);
}
static size_t
dt_probe_keylen(const dtrace_probedesc_t *pdp)
{
return (strlen(pdp->dtpd_mod) + 1 +
strlen(pdp->dtpd_func) + 1 + strlen(pdp->dtpd_name) + 1);
}
static char *
dt_probe_key(const dtrace_probedesc_t *pdp, char *s)
{
(void) snprintf(s, INT_MAX, "%s:%s:%s",
pdp->dtpd_mod, pdp->dtpd_func, pdp->dtpd_name);
return (s);
}
/*
* If a probe was discovered from the kernel, ask dtrace(7D) for a description
* of each of its arguments, including native and translated types.
*/
static dt_probe_t *
dt_probe_discover(dt_provider_t *pvp, const dtrace_probedesc_t *pdp)
{
dtrace_hdl_t *dtp = pvp->pv_hdl;
char *name = dt_probe_key(pdp, alloca(dt_probe_keylen(pdp)));
dt_node_t *xargs, *nargs;
dt_ident_t *idp;
dt_probe_t *prp;
dtrace_typeinfo_t dtt;
int i, nc, xc;
int adc = _dtrace_argmax;
dtrace_argdesc_t *adv = alloca(sizeof (dtrace_argdesc_t) * adc);
dtrace_argdesc_t *adp = adv;
assert(strcmp(pvp->pv_desc.dtvd_name, pdp->dtpd_provider) == 0);
assert(pdp->dtpd_id != DTRACE_IDNONE);
dt_dprintf("discovering probe %s:%s id=%d\n",
pvp->pv_desc.dtvd_name, name, pdp->dtpd_id);
for (nc = -1, i = 0; i < adc; i++, adp++) {
bzero(adp, sizeof (dtrace_argdesc_t));
adp->dtargd_ndx = i;
adp->dtargd_id = pdp->dtpd_id;
if (dt_ioctl(dtp, DTRACEIOC_PROBEARG, adp) != 0) {
(void) dt_set_errno(dtp, errno);
return (NULL);
}
if (adp->dtargd_ndx == DTRACE_ARGNONE)
break; /* all argument descs have been retrieved */
nc = MAX(nc, adp->dtargd_mapping);
}
xc = i;
nc++;
/*
* Now that we have discovered the number of native and translated
* arguments from the argument descriptions, allocate a new probe ident
* and corresponding dt_probe_t and hash it into the provider.
*/
xargs = dt_probe_alloc_args(pvp, xc);
nargs = dt_probe_alloc_args(pvp, nc);
if ((xc != 0 && xargs == NULL) || (nc != 0 && nargs == NULL))
return (NULL); /* dt_errno is set for us */
idp = dt_ident_create(name, DT_IDENT_PROBE,
DT_IDFLG_ORPHAN, pdp->dtpd_id, _dtrace_defattr, 0,
&dt_idops_probe, NULL, dtp->dt_gen);
if (idp == NULL) {
(void) dt_set_errno(dtp, EDT_NOMEM);
return (NULL);
}
if ((prp = dt_probe_create(dtp, idp, 2,
nargs, nc, xargs, xc)) == NULL) {
dt_ident_destroy(idp);
return (NULL);
}
dt_probe_declare(pvp, prp);
/*
* Once our new dt_probe_t is fully constructed, iterate over the
* cached argument descriptions and assign types to prp->pr_nargv[]
* and prp->pr_xargv[] and assign mappings to prp->pr_mapping[].
*/
for (adp = adv, i = 0; i < xc; i++, adp++) {
if (dtrace_type_strcompile(dtp,
adp->dtargd_native, &dtt) != 0) {
dt_dprintf("failed to resolve input type %s "
"for %s:%s arg #%d: %s\n", adp->dtargd_native,
pvp->pv_desc.dtvd_name, name, i + 1,
dtrace_errmsg(dtp, dtrace_errno(dtp)));
dtt.dtt_object = NULL;
dtt.dtt_ctfp = NULL;
dtt.dtt_type = CTF_ERR;
} else {
dt_node_type_assign(prp->pr_nargv[adp->dtargd_mapping],
dtt.dtt_ctfp, dtt.dtt_type);
}
if (dtt.dtt_type != CTF_ERR && (adp->dtargd_xlate[0] == '\0' ||
strcmp(adp->dtargd_native, adp->dtargd_xlate) == 0)) {
dt_node_type_propagate(prp->pr_nargv[
adp->dtargd_mapping], prp->pr_xargv[i]);
} else if (dtrace_type_strcompile(dtp,
adp->dtargd_xlate, &dtt) != 0) {
dt_dprintf("failed to resolve output type %s "
"for %s:%s arg #%d: %s\n", adp->dtargd_xlate,
pvp->pv_desc.dtvd_name, name, i + 1,
dtrace_errmsg(dtp, dtrace_errno(dtp)));
dtt.dtt_object = NULL;
dtt.dtt_ctfp = NULL;
dtt.dtt_type = CTF_ERR;
} else {
dt_node_type_assign(prp->pr_xargv[i],
dtt.dtt_ctfp, dtt.dtt_type);
}
prp->pr_mapping[i] = adp->dtargd_mapping;
prp->pr_argv[i] = dtt;
}
return (prp);
}
/*
* Lookup a probe declaration based on a known provider and full or partially
* specified module, function, and name. If the probe is not known to us yet,
* ask dtrace(7D) to match the description and then cache any useful results.
*/
dt_probe_t *
dt_probe_lookup(dt_provider_t *pvp, const char *s)
{
dtrace_hdl_t *dtp = pvp->pv_hdl;
dtrace_probedesc_t pd;
dt_ident_t *idp;
size_t keylen;
char *key;
if (dtrace_str2desc(dtp, DTRACE_PROBESPEC_NAME, s, &pd) != 0)
return (NULL); /* dt_errno is set for us */
keylen = dt_probe_keylen(&pd);
key = dt_probe_key(&pd, alloca(keylen));
/*
* If the probe is already declared, then return the dt_probe_t from
* the existing identifier. This could come from a static declaration
* or it could have been cached from an earlier call to this function.
*/
if ((idp = dt_idhash_lookup(pvp->pv_probes, key)) != NULL)
return (idp->di_data);
/*
* If the probe isn't known, use the probe description computed above
* to ask dtrace(7D) to find the first matching probe.
*/
if (dt_ioctl(dtp, DTRACEIOC_PROBEMATCH, &pd) == 0)
return (dt_probe_discover(pvp, &pd));
if (errno == ESRCH || errno == EBADF)
(void) dt_set_errno(dtp, EDT_NOPROBE);
else
(void) dt_set_errno(dtp, errno);
return (NULL);
}
dt_probe_t *
dt_probe_create(dtrace_hdl_t *dtp, dt_ident_t *idp, int protoc,
dt_node_t *nargs, uint_t nargc, dt_node_t *xargs, uint_t xargc)
{
dt_module_t *dmp;
dt_probe_t *prp;
const char *p;
uint_t i;
assert(idp->di_kind == DT_IDENT_PROBE);
assert(idp->di_data == NULL);
/*
* If only a single prototype is given, set xargc/s to nargc/s to
* simplify subsequent use. Note that we can have one or both of nargs
* and xargs be specified but set to NULL, indicating a void prototype.
*/
if (protoc < 2) {
assert(xargs == NULL);
assert(xargc == 0);
xargs = nargs;
xargc = nargc;
}
if ((prp = dt_alloc(dtp, sizeof (dt_probe_t))) == NULL)
return (NULL);
prp->pr_pvp = NULL;
prp->pr_ident = idp;
p = strrchr(idp->di_name, ':');
assert(p != NULL);
prp->pr_name = p + 1;
prp->pr_nargs = nargs;
prp->pr_nargv = dt_alloc(dtp, sizeof (dt_node_t *) * nargc);
prp->pr_nargc = nargc;
prp->pr_xargs = xargs;
prp->pr_xargv = dt_alloc(dtp, sizeof (dt_node_t *) * xargc);
prp->pr_xargc = xargc;
prp->pr_mapping = dt_alloc(dtp, sizeof (uint8_t) * xargc);
prp->pr_inst = NULL;
prp->pr_argv = dt_alloc(dtp, sizeof (dtrace_typeinfo_t) * xargc);
prp->pr_argc = xargc;
if ((prp->pr_nargc != 0 && prp->pr_nargv == NULL) ||
(prp->pr_xargc != 0 && prp->pr_xargv == NULL) ||
(prp->pr_xargc != 0 && prp->pr_mapping == NULL) ||
(prp->pr_argc != 0 && prp->pr_argv == NULL)) {
dt_probe_destroy(prp);
return (NULL);
}
for (i = 0; i < xargc; i++, xargs = xargs->dn_list) {
if (xargs->dn_string != NULL)
prp->pr_mapping[i] = dt_probe_argmap(xargs, nargs);
else
prp->pr_mapping[i] = i;
prp->pr_xargv[i] = xargs;
if ((dmp = dt_module_lookup_by_ctf(dtp,
xargs->dn_ctfp)) != NULL)
prp->pr_argv[i].dtt_object = dmp->dm_name;
else
prp->pr_argv[i].dtt_object = NULL;
prp->pr_argv[i].dtt_ctfp = xargs->dn_ctfp;
prp->pr_argv[i].dtt_type = xargs->dn_type;
}
for (i = 0; i < nargc; i++, nargs = nargs->dn_list)
prp->pr_nargv[i] = nargs;
idp->di_data = prp;
return (prp);
}
void
dt_probe_declare(dt_provider_t *pvp, dt_probe_t *prp)
{
assert(prp->pr_ident->di_kind == DT_IDENT_PROBE);
assert(prp->pr_ident->di_data == prp);
assert(prp->pr_pvp == NULL);
if (prp->pr_xargs != prp->pr_nargs)
pvp->pv_flags &= ~DT_PROVIDER_INTF;
prp->pr_pvp = pvp;
dt_idhash_xinsert(pvp->pv_probes, prp->pr_ident);
}
void
dt_probe_destroy(dt_probe_t *prp)
{
dt_probe_instance_t *pip, *pip_next;
dtrace_hdl_t *dtp;
if (prp->pr_pvp != NULL)
dtp = prp->pr_pvp->pv_hdl;
else
dtp = yypcb->pcb_hdl;
dt_node_list_free(&prp->pr_nargs);
dt_node_list_free(&prp->pr_xargs);
dt_free(dtp, prp->pr_nargv);
dt_free(dtp, prp->pr_xargv);
for (pip = prp->pr_inst; pip != NULL; pip = pip_next) {
pip_next = pip->pi_next;
dt_free(dtp, pip->pi_offs);
dt_free(dtp, pip->pi_enoffs);
dt_free(dtp, pip);
}
dt_free(dtp, prp->pr_mapping);
dt_free(dtp, prp->pr_argv);
dt_free(dtp, prp);
}
int
dt_probe_define(dt_provider_t *pvp, dt_probe_t *prp,
const char *fname, const char *rname, uint32_t offset, int isenabled)
{
dtrace_hdl_t *dtp = pvp->pv_hdl;
dt_probe_instance_t *pip;
uint32_t **offs;
uint_t *noffs, *maxoffs;
assert(fname != NULL);
for (pip = prp->pr_inst; pip != NULL; pip = pip->pi_next) {
if (strcmp(pip->pi_fname, fname) == 0 &&
((rname == NULL && pip->pi_rname[0] == '\0') ||
(rname != NULL && strcmp(pip->pi_rname, rname)) == 0))
break;
}
if (pip == NULL) {
if ((pip = dt_zalloc(dtp, sizeof (*pip))) == NULL)
return (-1);
if ((pip->pi_offs = dt_zalloc(dtp,
sizeof (uint32_t))) == NULL) {
dt_free(dtp, pip);
return (-1);
}
if ((pip->pi_enoffs = dt_zalloc(dtp,
sizeof (uint32_t))) == NULL) {
dt_free(dtp, pip->pi_offs);
dt_free(dtp, pip);
return (-1);
}
(void) strlcpy(pip->pi_fname, fname, sizeof (pip->pi_fname));
if (rname != NULL) {
if (strlen(rname) + 1 > sizeof (pip->pi_rname)) {
dt_free(dtp, pip->pi_offs);
dt_free(dtp, pip);
return (dt_set_errno(dtp, EDT_COMPILER));
}
(void) strcpy(pip->pi_rname, rname);
}
pip->pi_noffs = 0;
pip->pi_maxoffs = 1;
pip->pi_nenoffs = 0;
pip->pi_maxenoffs = 1;
pip->pi_next = prp->pr_inst;
prp->pr_inst = pip;
}
if (isenabled) {
offs = &pip->pi_enoffs;
noffs = &pip->pi_nenoffs;
maxoffs = &pip->pi_maxenoffs;
} else {
offs = &pip->pi_offs;
noffs = &pip->pi_noffs;
maxoffs = &pip->pi_maxoffs;
}
if (*noffs == *maxoffs) {
uint_t new_max = *maxoffs * 2;
uint32_t *new_offs = dt_alloc(dtp, sizeof (uint32_t) * new_max);
if (new_offs == NULL)
return (-1);
bcopy(*offs, new_offs, sizeof (uint32_t) * *maxoffs);
dt_free(dtp, *offs);
*maxoffs = new_max;
*offs = new_offs;
}
dt_dprintf("defined probe %s %s:%s %s() +0x%x (%s)\n",
isenabled ? "(is-enabled)" : "",
pvp->pv_desc.dtvd_name, prp->pr_ident->di_name, fname, offset,
rname != NULL ? rname : fname);
assert(*noffs < *maxoffs);
(*offs)[(*noffs)++] = offset;
return (0);
}
/*
* Lookup the dynamic translator type tag for the specified probe argument and
* assign the type to the specified node. If the type is not yet defined, add
* it to the "D" module's type container as a typedef for an unknown type.
*/
dt_node_t *
dt_probe_tag(dt_probe_t *prp, uint_t argn, dt_node_t *dnp)
{
dtrace_hdl_t *dtp = prp->pr_pvp->pv_hdl;
dtrace_typeinfo_t dtt;
size_t len;
char *tag;
len = snprintf(NULL, 0, "__dtrace_%s___%s_arg%u",
prp->pr_pvp->pv_desc.dtvd_name, prp->pr_name, argn);
tag = alloca(len + 1);
(void) snprintf(tag, len + 1, "__dtrace_%s___%s_arg%u",
prp->pr_pvp->pv_desc.dtvd_name, prp->pr_name, argn);
if (dtrace_lookup_by_type(dtp, DTRACE_OBJ_DDEFS, tag, &dtt) != 0) {
dtt.dtt_object = DTRACE_OBJ_DDEFS;
dtt.dtt_ctfp = DT_DYN_CTFP(dtp);
dtt.dtt_type = ctf_add_typedef(DT_DYN_CTFP(dtp),
CTF_ADD_ROOT, tag, DT_DYN_TYPE(dtp));
if (dtt.dtt_type == CTF_ERR ||
ctf_update(dtt.dtt_ctfp) == CTF_ERR) {
xyerror(D_UNKNOWN, "cannot define type %s: %s\n",
tag, ctf_errmsg(ctf_errno(dtt.dtt_ctfp)));
}
}
bzero(dnp, sizeof (dt_node_t));
dnp->dn_kind = DT_NODE_TYPE;
dt_node_type_assign(dnp, dtt.dtt_ctfp, dtt.dtt_type);
dt_node_attr_assign(dnp, _dtrace_defattr);
return (dnp);
}
/*ARGSUSED*/
static int
dt_probe_desc(dtrace_hdl_t *dtp, const dtrace_probedesc_t *pdp, void *arg)
{
if (((dtrace_probedesc_t *)arg)->dtpd_id == DTRACE_IDNONE) {
bcopy(pdp, arg, sizeof (dtrace_probedesc_t));
return (0);
}
return (1);
}
dt_probe_t *
dt_probe_info(dtrace_hdl_t *dtp,
const dtrace_probedesc_t *pdp, dtrace_probeinfo_t *pip)
{
int m_is_glob = pdp->dtpd_mod[0] == '\0' || strisglob(pdp->dtpd_mod);
int f_is_glob = pdp->dtpd_func[0] == '\0' || strisglob(pdp->dtpd_func);
int n_is_glob = pdp->dtpd_name[0] == '\0' || strisglob(pdp->dtpd_name);
dt_probe_t *prp = NULL;
const dtrace_pattr_t *pap;
dt_provider_t *pvp;
dt_ident_t *idp;
/*
* Attempt to lookup the probe in our existing cache for this provider.
* If none is found and an explicit probe ID was specified, discover
* that specific probe and cache its description and arguments.
*/
if ((pvp = dt_provider_lookup(dtp, pdp->dtpd_provider)) != NULL) {
size_t keylen = dt_probe_keylen(pdp);
char *key = dt_probe_key(pdp, alloca(keylen));
if ((idp = dt_idhash_lookup(pvp->pv_probes, key)) != NULL)
prp = idp->di_data;
else if (pdp->dtpd_id != DTRACE_IDNONE)
prp = dt_probe_discover(pvp, pdp);
}
/*
* If no probe was found in our cache, convert the caller's partial
* probe description into a fully-formed matching probe description by
* iterating over up to at most two probes that match 'pdp'. We then
* call dt_probe_discover() on the resulting probe identifier.
*/
if (prp == NULL) {
dtrace_probedesc_t pd;
int m;
bzero(&pd, sizeof (pd));
pd.dtpd_id = DTRACE_IDNONE;
/*
* Call dtrace_probe_iter() to find matching probes. Our
* dt_probe_desc() callback will produce the following results:
*
* m < 0 dtrace_probe_iter() found zero matches (or failed).
* m > 0 dtrace_probe_iter() found more than one match.
* m = 0 dtrace_probe_iter() found exactly one match.
*/
if ((m = dtrace_probe_iter(dtp, pdp, dt_probe_desc, &pd)) < 0)
return (NULL); /* dt_errno is set for us */
if ((pvp = dt_provider_lookup(dtp, pd.dtpd_provider)) == NULL)
return (NULL); /* dt_errno is set for us */
/*
* If more than one probe was matched, then do not report probe
* information if either of the following conditions is true:
*
* (a) The Arguments Data stability of the matched provider is
* less than Evolving.
*
* (b) Any description component that is at least Evolving is
* empty or is specified using a globbing expression.
*
* These conditions imply that providers that provide Evolving
* or better Arguments Data stability must guarantee that all
* probes with identical field names in a field of Evolving or
* better Name stability have identical argument signatures.
*/
if (m > 0) {
if (pvp->pv_desc.dtvd_attr.dtpa_args.dtat_data <
DTRACE_STABILITY_EVOLVING) {
(void) dt_set_errno(dtp, EDT_UNSTABLE);
return (NULL);
}
if (pvp->pv_desc.dtvd_attr.dtpa_mod.dtat_name >=
DTRACE_STABILITY_EVOLVING && m_is_glob) {
(void) dt_set_errno(dtp, EDT_UNSTABLE);
return (NULL);
}
if (pvp->pv_desc.dtvd_attr.dtpa_func.dtat_name >=
DTRACE_STABILITY_EVOLVING && f_is_glob) {
(void) dt_set_errno(dtp, EDT_UNSTABLE);
return (NULL);
}
if (pvp->pv_desc.dtvd_attr.dtpa_name.dtat_name >=
DTRACE_STABILITY_EVOLVING && n_is_glob) {
(void) dt_set_errno(dtp, EDT_UNSTABLE);
return (NULL);
}
}
/*
* If we matched a probe exported by dtrace(7D), then discover
* the real attributes. Otherwise grab the static declaration.
*/
if (pd.dtpd_id != DTRACE_IDNONE)
prp = dt_probe_discover(pvp, &pd);
else
prp = dt_probe_lookup(pvp, pd.dtpd_name);
if (prp == NULL)
return (NULL); /* dt_errno is set for us */
}
assert(pvp != NULL && prp != NULL);
/*
* Compute the probe description attributes by taking the minimum of
* the attributes of the specified fields. If no provider is specified
* or a glob pattern is used for the provider, use Unstable attributes.
*/
if (pdp->dtpd_provider[0] == '\0' || strisglob(pdp->dtpd_provider))
pap = &_dtrace_prvdesc;
else
pap = &pvp->pv_desc.dtvd_attr;
pip->dtp_attr = pap->dtpa_provider;
if (!m_is_glob)
pip->dtp_attr = dt_attr_min(pip->dtp_attr, pap->dtpa_mod);
if (!f_is_glob)
pip->dtp_attr = dt_attr_min(pip->dtp_attr, pap->dtpa_func);
if (!n_is_glob)
pip->dtp_attr = dt_attr_min(pip->dtp_attr, pap->dtpa_name);
pip->dtp_arga = pap->dtpa_args;
pip->dtp_argv = prp->pr_argv;
pip->dtp_argc = prp->pr_argc;
return (prp);
}
int
dtrace_probe_info(dtrace_hdl_t *dtp,
const dtrace_probedesc_t *pdp, dtrace_probeinfo_t *pip)
{
return (dt_probe_info(dtp, pdp, pip) != NULL ? 0 : -1);
}
/*ARGSUSED*/
static int
dt_probe_iter(dt_idhash_t *ihp, dt_ident_t *idp, dt_probe_iter_t *pit)
{
const dt_probe_t *prp = idp->di_data;
if (!dt_gmatch(prp->pr_name, pit->pit_pat))
return (0); /* continue on and examine next probe in hash */
(void) strlcpy(pit->pit_desc.dtpd_name, prp->pr_name, DTRACE_NAMELEN);
pit->pit_desc.dtpd_id = idp->di_id;
pit->pit_matches++;
return (pit->pit_func(pit->pit_hdl, &pit->pit_desc, pit->pit_arg));
}
int
dtrace_probe_iter(dtrace_hdl_t *dtp,
const dtrace_probedesc_t *pdp, dtrace_probe_f *func, void *arg)
{
const char *provider = pdp ? pdp->dtpd_provider : NULL;
dtrace_id_t id = DTRACE_IDNONE;
dtrace_probedesc_t pd;
dt_probe_iter_t pit;
int cmd, rv;
bzero(&pit, sizeof (pit));
pit.pit_hdl = dtp;
pit.pit_func = func;
pit.pit_arg = arg;
pit.pit_pat = pdp ? pdp->dtpd_name : NULL;
for (pit.pit_pvp = dt_list_next(&dtp->dt_provlist);
pit.pit_pvp != NULL; pit.pit_pvp = dt_list_next(pit.pit_pvp)) {
if (pit.pit_pvp->pv_flags & DT_PROVIDER_IMPL)
continue; /* we'll get these later using dt_ioctl() */
if (!dt_gmatch(pit.pit_pvp->pv_desc.dtvd_name, provider))
continue;
(void) strlcpy(pit.pit_desc.dtpd_provider,
pit.pit_pvp->pv_desc.dtvd_name, DTRACE_PROVNAMELEN);
if ((rv = dt_idhash_iter(pit.pit_pvp->pv_probes,
(dt_idhash_f *)dt_probe_iter, &pit)) != 0)
return (rv);
}
if (pdp != NULL)
cmd = DTRACEIOC_PROBEMATCH;
else
cmd = DTRACEIOC_PROBES;
for (;;) {
if (pdp != NULL)
bcopy(pdp, &pd, sizeof (pd));
pd.dtpd_id = id;
if (dt_ioctl(dtp, cmd, &pd) != 0)
break;
else if ((rv = func(dtp, &pd, arg)) != 0)
return (rv);
pit.pit_matches++;
id = pd.dtpd_id + 1;
}
switch (errno) {
case ESRCH:
case EBADF:
return (pit.pit_matches ? 0 : dt_set_errno(dtp, EDT_NOPROBE));
case EINVAL:
return (dt_set_errno(dtp, EDT_BADPGLOB));
default:
return (dt_set_errno(dtp, errno));
}
}