*/
#include <assert.h>
+#include <common/compat/string.h>
#include <common/error.h>
#include <common/macros.h>
-#include <common/compat/string.h>
#include <fcntl.h>
#include <lttng/constant.h>
#include <lttng/userspace-probe-internal.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/unistd.h>
enum lttng_userspace_probe_location_lookup_method_type
lttng_userspace_probe_location_lookup_method_get_type(
}
}
+/*
+ * Compare two FDs.
+ * For now only the Inode number is compared.
+ */
+static bool fd_is_equal(int a, int b)
+{
+ int ret;
+ bool is_equal = false;
+ struct stat a_stat, b_stat;
+
+ if (a < 0 && b >= 0) {
+ goto end;
+ }
+
+ if (b < 0 && a >= 0) {
+ goto end;
+ }
+
+ if (a < 0 && b < 0) {
+ if (a == -1 && b == -1) {
+ is_equal = true;
+ goto end;
+ }
+ /* Invalid state, assert */
+ assert(0);
+ goto end;
+ }
+
+ /* Both are valid FD numbers */
+ ret = fstat(a, &a_stat);
+ if (ret) {
+ PERROR("fstat on fd a: %d", a);
+ goto end;
+ }
+
+ ret = fstat(b, &b_stat);
+ if (ret) {
+ PERROR("fstat on fd b: %d", b);
+ goto end;
+ }
+
+ is_equal = (a_stat.st_ino == b_stat.st_ino);
+
+end:
+ return is_equal;
+}
+
+static bool lttng_userspace_probe_location_function_is_equal(
+ const struct lttng_userspace_probe_location *_a,
+ const struct lttng_userspace_probe_location *_b)
+{
+ bool is_equal = false;
+ struct lttng_userspace_probe_location_function *a, *b;
+
+ a = container_of(_a, struct lttng_userspace_probe_location_function,
+ parent);
+ b = container_of(_b, struct lttng_userspace_probe_location_function,
+ parent);
+
+ if (a->instrumentation_type != b->instrumentation_type) {
+ goto end;
+ }
+
+ assert(a->function_name);
+ assert(b->function_name);
+ if (strcmp(a->function_name, b->function_name)) {
+ goto end;
+ }
+
+ assert(a->binary_path);
+ assert(b->binary_path);
+ if (strcmp(a->binary_path, b->binary_path)) {
+ goto end;
+ }
+
+ // TODO: see gerrit comment: https://review.lttng.org/c/lttng-tools/+/2924/27/src/common/userspace-probe.c#255
+ //is_equal = fd_is_equal(a->binary_fd, b->binary_fd);
+ is_equal = true;
+end:
+ return is_equal;
+}
+
static struct lttng_userspace_probe_location *
lttng_userspace_probe_location_function_create_no_check(const char *binary_path,
const char *function_name,
ret = &location->parent;
ret->lookup_method = lookup_method;
ret->type = LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION;
+ ret->equal = lttng_userspace_probe_location_function_is_equal;
goto end;
error:
return ret;
}
+static bool lttng_userspace_probe_location_tracepoint_is_equal(
+ const struct lttng_userspace_probe_location *_a,
+ const struct lttng_userspace_probe_location *_b)
+{
+ bool is_equal = false;
+ struct lttng_userspace_probe_location_tracepoint *a, *b;
+
+ a = container_of(_a, struct lttng_userspace_probe_location_tracepoint,
+ parent);
+ b = container_of(_b, struct lttng_userspace_probe_location_tracepoint,
+ parent);
+
+ assert(a->probe_name);
+ assert(b->probe_name);
+ if (strcmp(a->probe_name, b->probe_name)) {
+ goto end;
+ }
+
+ assert(a->provider_name);
+ assert(b->provider_name);
+ if (strcmp(a->provider_name, b->provider_name)) {
+ goto end;
+ }
+
+ assert(a->binary_path);
+ assert(b->binary_path);
+ if (strcmp(a->binary_path, b->binary_path)) {
+ goto end;
+ }
+
+ is_equal = fd_is_equal(a->binary_fd, b->binary_fd);
+
+end:
+ return is_equal;
+}
+
static struct lttng_userspace_probe_location *
lttng_userspace_probe_location_tracepoint_create_no_check(const char *binary_path,
const char *provider_name, const char *probe_name,
ret = &location->parent;
ret->lookup_method = lookup_method;
ret->type = LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT;
+ ret->equal = lttng_userspace_probe_location_tracepoint_is_equal;
goto end;
error:
err:
return new_location;
}
+
+LTTNG_HIDDEN
+bool lttng_userspace_probe_location_lookup_method_is_equal(
+ const struct lttng_userspace_probe_location_lookup_method *a,
+ const struct lttng_userspace_probe_location_lookup_method *b)
+{
+ bool is_equal = false;
+
+ if (!a || !b) {
+ goto end;
+ }
+
+ if (a == b) {
+ is_equal = true;
+ goto end;
+ }
+
+ /* Should we use the getter here? */
+ if (a->type != b->type) {
+ goto end;
+ }
+
+ /* Not much else to compare except the type for now */
+ is_equal = true;
+end:
+ return is_equal;
+}
+
+LTTNG_HIDDEN
+bool lttng_userspace_probe_location_is_equal(
+ const struct lttng_userspace_probe_location *a,
+ const struct lttng_userspace_probe_location *b)
+{
+ bool is_equal = false;
+
+ if (!a || !b) {
+ goto end;
+ }
+
+ if (a == b) {
+ is_equal = true;
+ goto end;
+ }
+
+ /* Should we use the getter here? */
+ if (!lttng_userspace_probe_location_lookup_method_is_equal(
+ a->lookup_method, b->lookup_method)) {
+ goto end;
+ }
+
+ /* Should we use the getter here? */
+ if (a->type != b->type) {
+ goto end;
+ }
+
+ is_equal = a->equal ? a->equal(a, b) : true;
+end:
+ return is_equal;
+}
+
+LTTNG_HIDDEN
+int lttng_userspace_probe_location_set_binary_fd(
+ struct lttng_userspace_probe_location *location, int fd)
+{
+ int ret = 0;
+ const struct lttng_userspace_probe_location_lookup_method *lookup = NULL;
+ /*
+ * Set the file descriptor received from the client through the unix
+ * socket in the probe location.
+ */
+ lookup = lttng_userspace_probe_location_get_lookup_method(location);
+ if (!lookup) {
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto end;
+ }
+
+ /*
+ * From the kernel tracer's perspective, all userspace probe event types
+ * are all the same: a file and an offset.
+ */
+ switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) {
+ case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
+ ret = lttng_userspace_probe_location_function_set_binary_fd(
+ location, fd);
+ break;
+ case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
+ ret = lttng_userspace_probe_location_tracepoint_set_binary_fd(
+ location, fd);
+ break;
+ default:
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto end;
+ }
+
+ if (ret) {
+ ret = LTTNG_ERR_PROBE_LOCATION_INVAL;
+ goto end;
+ }
+end:
+ return ret;
+}
projects / lttng-tools.git / blobdiff