+++ /dev/null
-/*
- * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#include <stdlib.h>
-#include <inttypes.h>
-#include <stdbool.h>
-#include <string.h>
-#include <stdarg.h>
-#include <tap/tap.h>
-#include <sys/types.h>
-#include <dirent.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-
-#include <urcu.h>
-
-#include <common/compat/directory-handle.h>
-#include <common/compat/errno.h>
-#include <common/error.h>
-#include <common/fs-handle.h>
-#include <common/fd-tracker/fd-tracker.h>
-
-/* For error.h */
-int lttng_opt_quiet = 1;
-int lttng_opt_verbose;
-int lttng_opt_mi;
-
-/* Number of TAP tests in this file */
-#define NUM_TESTS 61
-/* 3 for stdin, stdout, and stderr */
-#define STDIO_FD_COUNT 3
-#define TRACKER_FD_LIMIT 50
-#define TMP_DIR_PATTERN "/tmp/fd-tracker-XXXXXX"
-#define TEST_UNLINK_DIRECTORY_NAME "unlinked_files"
-
-#ifdef __linux__
-#define SELF_FD_DIR "/proc/self/fd"
-#else
-/* Most Unices have /dev/fd */
-#define SELF_FD_DIR "/dev/fd"
-#endif
-
-/*
- * Count of fds, beyond stdin, stderr, stdout that were open
- * at the launch of the test. This allows the test to succeed when
- * run by automake's test runner or valgrind which both open
- * fds behind our back.
- */
-int unknown_fds_count;
-
-const char file_contents[] = "Bacon ipsum dolor amet jerky drumstick sirloin "
- "strip steak venison boudin filet mignon picanha doner shoulder. "
- "Strip steak brisket alcatra, venison beef chuck cupim pastrami. "
- "Landjaeger tri-tip salami leberkas ball tip, ham hock chuck sausage "
- "flank jerky cupim. Pig bacon chuck pancetta andouille.";
-
-static
-void get_temporary_directories(char **_test_directory, char **_unlink_directory)
-{
- int ret;
- char tmp_path_pattern[] = TMP_DIR_PATTERN;
- char *output_dir;
-
- output_dir = mkdtemp(tmp_path_pattern);
- if (!output_dir) {
- diag("Failed to create temporary path of the form %s",
- TMP_DIR_PATTERN);
- abort();
- }
-
- *_test_directory = strdup(output_dir);
- LTTNG_ASSERT(*_test_directory);
- ret = asprintf(_unlink_directory, "%s/%s", output_dir,
- TEST_UNLINK_DIRECTORY_NAME);
- if (ret < 0) {
- abort();
- }
-}
-
-static
-int fd_count(void)
-{
- DIR *dir;
- struct dirent *entry;
- int count = 0;
-
- dir = opendir(SELF_FD_DIR);
- if (!dir) {
- perror("# Failed to enumerate " SELF_FD_DIR " to count the number of used file descriptors");
- count = -1;
- goto end;
- }
-
- while ((entry = readdir(dir)) != NULL) {
- if (!strcmp(entry->d_name, ".") || !strcmp(entry->d_name, "..")) {
- continue;
- }
- count++;
- }
- /* Don't account for the file descriptor opened by opendir(). */
- count--;
- if (closedir(dir)) {
- perror("# Failed to close test program's " SELF_FD_DIR " directory file descriptor");
- }
-end:
- return count;
-}
-
-static
-void check_fd_count(int expected_count)
-{
- int count = 0;
-
- count = fd_count();
- ok(count == expected_count, "Expected %d open file descriptors (%d are open)",
- expected_count, count);
-}
-
-static
-int noop_open(void *data, int *fds)
-{
- *fds = *((int *) data);
- return 0;
-}
-
-static
-int noop_close(void *data, int *fds)
-{
- return 0;
-}
-
-static
-void track_std_fds(struct fd_tracker *tracker)
-{
- int i;
- struct { int fd; const char *name; } files[] = {
- { .fd = fileno(stdin), .name = "stdin" },
- { .fd = fileno(stdout), .name = "stdout" },
- { .fd = fileno(stderr), .name = "stderr" },
- };
-
- for (i = 0; i < sizeof(files) / sizeof(*files); i++) {
- int out_fd, ret;
-
- ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd,
- &files[i].name, 1, noop_open, &files[i].fd);
- LTTNG_ASSERT(out_fd == files[i].fd);
-
- ok(ret == 0, "Track unsuspendable fd %d (%s)", files[i].fd,
- files[i].name);
- }
-}
-
-static
-void untrack_std_fds(struct fd_tracker *tracker)
-{
- int i;
- struct { int fd; const char *name; } files[] = {
- { .fd = fileno(stdin), .name = "stdin" },
- { .fd = fileno(stdout), .name = "stdout" },
- { .fd = fileno(stderr), .name = "stderr" },
- };
-
- for (i = 0; i < sizeof(files) / sizeof(*files); i++) {
- int fd = files[i].fd;
- int ret = fd_tracker_close_unsuspendable_fd(tracker,
- &files[i].fd, 1, noop_close, NULL);
-
- ok(ret == 0, "Untrack unsuspendable fd %d (%s)", fd,
- files[i].name);
- }
-}
-
-/*
- * Basic test opening and closing three unsuspendable fds.
- */
-static
-void test_unsuspendable_basic(void)
-{
- int ret;
- struct fd_tracker *tracker;
- char *test_directory = NULL, *unlinked_files_directory = NULL;
-
- get_temporary_directories(&test_directory, &unlinked_files_directory);
-
- tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT);
- ok(tracker, "Created an fd tracker with a limit of %d simulateously opened file descriptors",
- TRACKER_FD_LIMIT);
- if (!tracker) {
- goto end;
- }
-
- track_std_fds(tracker);
- untrack_std_fds(tracker);
-
- fd_tracker_destroy(tracker);
- ret = rmdir(test_directory);
- ok(ret == 0, "Test directory is empty");
-end:
- free(test_directory);
- free(unlinked_files_directory);
-}
-
-static
-int error_open(void *data, int *fds)
-{
- return *((int *) data);
-}
-
-static
-int error_close(void *data, int *fds)
-{
- return *((int *) data);
-}
-
-/*
- * Validate that user callback return values are returned to the
- * caller of the fd tracker.
- */
-static
-void test_unsuspendable_cb_return(void)
-{
- int ret, stdout_fd = fileno(stdout), out_fd = 42;
- struct fd_tracker *tracker;
- int expected_error = -ENETDOWN;
- char *test_directory = NULL, *unlinked_files_directory = NULL;
-
- get_temporary_directories(&test_directory, &unlinked_files_directory);
-
- tracker = fd_tracker_create(test_directory, TRACKER_FD_LIMIT);
- LTTNG_ASSERT(tracker);
-
- /* The error_open callback should fail and return 'expected_error'. */
- ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd,
- NULL, 1, error_open, &expected_error);
- ok(ret == expected_error, "fd_tracker_open_unsuspendable_fd() forwards the user callback's error code");
- ok(out_fd == 42, "Output fd parameter is unaffected on error of fd_tracker_open_unsuspendable_fd()");
-
- /*
- * Track a valid fd since we don't want the tracker to fail with an
- * invalid fd error for this test.
- */
- ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd,
- NULL, 1, noop_open, &stdout_fd);
- ok(out_fd == stdout_fd, "fd_tracker_open_unsuspendable_fd() sets the output fd parameter to the newly-tracked fd's value");
- LTTNG_ASSERT(!ret);
-
- ret = fd_tracker_close_unsuspendable_fd(tracker,
- &stdout_fd, 1, error_close, &expected_error);
- ok(ret == expected_error, "fd_tracker_close_unsuspendable_fd() forwards the user callback's error code");
- ret = fd_tracker_close_unsuspendable_fd(tracker,
- &stdout_fd, 1, noop_close, &expected_error);
- LTTNG_ASSERT(!ret);
-
- fd_tracker_destroy(tracker);
- ret = rmdir(test_directory);
- ok(ret == 0, "Test directory is empty");
- free(test_directory);
- free(unlinked_files_directory);
-}
-
-/*
- * Validate that the tracker refuses to track two identical unsuspendable
- * file descriptors.
- */
-static
-void test_unsuspendable_duplicate(void)
-{
- int ret, stdout_fd = fileno(stdout), out_fd;
- struct fd_tracker *tracker;
- char *test_directory = NULL, *unlinked_files_directory = NULL;
-
- get_temporary_directories(&test_directory, &unlinked_files_directory);
-
- tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT);
- LTTNG_ASSERT(tracker);
-
- ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd,
- NULL, 1, noop_open, &stdout_fd);
- LTTNG_ASSERT(!ret);
- ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd,
- NULL, 1, noop_open, &stdout_fd);
- ok(ret == -EEXIST, "EEXIST reported on open of an already tracked file descriptor");
-
- ret = fd_tracker_close_unsuspendable_fd(tracker,
- &stdout_fd, 1, noop_close, NULL);
- LTTNG_ASSERT(!ret);
-
- fd_tracker_destroy(tracker);
- ret = rmdir(test_directory);
- ok(ret == 0, "Test directory is empty");
- free(test_directory);
- free(unlinked_files_directory);
-}
-
-static
-int open_pipes(void *data, int *out_fds)
-{
- unsigned int i;
- const unsigned int pipe_count = TRACKER_FD_LIMIT / 2;
-
- for (i = 0; i < pipe_count; i++) {
- int ret = pipe(&out_fds[i * 2]);
-
- if (ret) {
- return -errno;
- }
- }
- return 0;
-}
-
-static
-int close_pipes(void *data, int *fds)
-{
- int i;
- int *pipes = fds;
-
- for (i = 0; i < TRACKER_FD_LIMIT; i++) {
- int ret = close(pipes[i]);
-
- if (ret) {
- return -errno;
- }
- }
- return 0;
-}
-
-/*
- * Validate that the tracker enforces the open file descriptor limit
- * when unsuspendable file descriptors are being opened.
- */
-static
-void test_unsuspendable_limit(void)
-{
- struct fd_tracker *tracker;
- int ret, stdout_fd = fileno(stdout), out_fd;
- int fds[TRACKER_FD_LIMIT];
- char *test_directory = NULL, *unlinked_files_directory = NULL;
-
- get_temporary_directories(&test_directory, &unlinked_files_directory);
-
- /* This test assumes TRACKER_FD_LIMIT is a multiple of 2. */
- LTTNG_ASSERT((TRACKER_FD_LIMIT % 2 == 0) && TRACKER_FD_LIMIT);
-
- tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT);
- LTTNG_ASSERT(tracker);
-
- ret = fd_tracker_open_unsuspendable_fd(tracker, fds,
- NULL, TRACKER_FD_LIMIT, open_pipes, NULL);
- ok(ret == 0, "File descriptor tracker allowed the user to meet its limit with unsuspendable file descriptors (%d)",
- TRACKER_FD_LIMIT);
-
- ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd,
- NULL, 1, noop_open, &stdout_fd);
- ok(ret == -EMFILE, "EMFILE reported when exceeding the file descriptor limit while opening an unsuspendable fd");
-
- ret = fd_tracker_close_unsuspendable_fd(tracker,
- fds, TRACKER_FD_LIMIT, close_pipes, NULL);
- LTTNG_ASSERT(!ret);
-
- fd_tracker_destroy(tracker);
- ret = rmdir(test_directory);
- ok(ret == 0, "Test directory is empty");
- free(test_directory);
- free(unlinked_files_directory);
-}
-
-/*
- * Validate that the tracker refuses to track two identical unsuspendable
- * file descriptors.
- */
-static
-void test_unsuspendable_close_untracked(void)
-{
- int ret, stdout_fd = fileno(stdout), unknown_fds[2], out_fd;
- struct fd_tracker *tracker;
- char *test_directory = NULL, *unlinked_files_directory = NULL;
-
- get_temporary_directories(&test_directory, &unlinked_files_directory);
-
- tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT);
- if (!tracker) {
- goto end;;
- }
-
- ret = pipe(unknown_fds);
- LTTNG_ASSERT(!ret);
- ret = close(unknown_fds[0]);
- LTTNG_ASSERT(ret == 0);
- ret = close(unknown_fds[1]);
- LTTNG_ASSERT(ret == 0);
-
- ret = fd_tracker_open_unsuspendable_fd(tracker, &out_fd,
- NULL, 1, noop_open, &stdout_fd);
- LTTNG_ASSERT(!ret);
-
- ret = fd_tracker_close_unsuspendable_fd(tracker,
- unknown_fds, 1, noop_close, NULL);
- ok(ret == -EINVAL, "EINVAL reported on close of an untracked file descriptor");
-
- ret = fd_tracker_close_unsuspendable_fd(tracker,
- &stdout_fd, 1, noop_close, NULL);
- LTTNG_ASSERT(!ret);
-
- fd_tracker_destroy(tracker);
- ret = rmdir(test_directory);
- ok(ret == 0, "Test directory is empty");
-end:
- free(test_directory);
- free(unlinked_files_directory);
-}
-
-static int open_files(struct fd_tracker *tracker,
- struct lttng_directory_handle *directory,
- unsigned int count,
- struct fs_handle **handles,
- char **file_paths)
-{
- int ret = 0;
- unsigned int i;
-
- for (i = 0; i < count; i++) {
- int p_ret;
- char *file_path;
- struct fs_handle *handle;
- mode_t mode = S_IWUSR | S_IRUSR;
-
- p_ret = asprintf(&file_path, "file-%u", i);
- LTTNG_ASSERT(p_ret >= 0);
- file_paths[i] = file_path;
-
- handle = fd_tracker_open_fs_handle(tracker, directory, file_path,
- O_RDWR | O_CREAT, &mode);
- if (!handle) {
- ret = -1;
- break;
- }
- handles[i] = handle;
- }
- return ret;
-}
-
-static int open_same_file(struct fd_tracker *tracker,
- struct lttng_directory_handle *directory,
- const char *file,
- unsigned int count,
- struct fs_handle **handles)
-{
- int ret = 0;
- unsigned int i;
-
- for (i = 0; i < count; i++) {
- struct fs_handle *handle;
- mode_t mode = S_IWUSR | S_IRUSR;
-
- handle = fd_tracker_open_fs_handle(tracker, directory, file,
- O_RDWR | O_CREAT, &mode);
- if (!handle) {
- ret = -1;
- break;
- }
- handles[i] = handle;
- }
- return ret;
-}
-
-static
-int cleanup_files(struct fd_tracker *tracker, const char *dir,
- unsigned int count, struct fs_handle **handles,
- char **file_paths)
-{
- int ret = 0;
- unsigned int i;
-
- for (i = 0; i < count; i++) {
- char *file_path = file_paths[i];
-
- if (!file_path) {
- break;
- }
- if (fs_handle_unlink(handles[i])) {
- diag("Failed to unlink fs_handle to file %s", file_path);
- ret = -1;
- }
- if (fs_handle_close(handles[i])) {
- diag("Failed to close fs_handle to file %s", file_path);
- ret = -1;
- }
- free(file_path);
- }
- return ret;
-}
-
-static
-void test_suspendable_limit(void)
-{
- int ret;
- const int files_to_create = TRACKER_FD_LIMIT * 10;
- struct fd_tracker *tracker;
- char *test_directory = NULL, *unlinked_files_directory = NULL;
- char *output_files[files_to_create];
- struct fs_handle *handles[files_to_create];
- struct lttng_directory_handle *dir_handle = NULL;
- int dir_handle_fd_count;
-
- memset(output_files, 0, sizeof(output_files));
- memset(handles, 0, sizeof(handles));
-
- get_temporary_directories(&test_directory, &unlinked_files_directory);
-
- tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT);
- if (!tracker) {
- goto end;
- }
-
- dir_handle = lttng_directory_handle_create(test_directory);
- LTTNG_ASSERT(dir_handle);
- dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle);
-
- ret = open_files(tracker, dir_handle, files_to_create, handles,
- output_files);
- ok(!ret, "Created %d files with a limit of %d simultaneously-opened file descriptor",
- files_to_create, TRACKER_FD_LIMIT);
- check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count +
- dir_handle_fd_count);
-
- ret = cleanup_files(tracker, test_directory, files_to_create, handles,
- output_files);
- ok(!ret, "Close all opened filesystem handles");
- ret = rmdir(test_directory);
- ok(ret == 0, "Test directory is empty");
- fd_tracker_destroy(tracker);
- lttng_directory_handle_put(dir_handle);
-end:
- free(test_directory);
- free(unlinked_files_directory);
-}
-
-static
-void test_mixed_limit(void)
-{
- int ret;
- const int files_to_create = TRACKER_FD_LIMIT;
- struct fd_tracker *tracker;
- char *test_directory = NULL, *unlinked_files_directory = NULL;
- char *output_files[files_to_create];
- struct fs_handle *handles[files_to_create];
- struct lttng_directory_handle *dir_handle = NULL;
- int dir_handle_fd_count;
-
- memset(output_files, 0, sizeof(output_files));
- memset(handles, 0, sizeof(handles));
-
- get_temporary_directories(&test_directory, &unlinked_files_directory);
-
- tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT);
- if (!tracker) {
- goto end;
- }
-
- dir_handle = lttng_directory_handle_create(test_directory);
- LTTNG_ASSERT(dir_handle);
- dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle);
-
- ret = open_files(tracker, dir_handle, files_to_create, handles,
- output_files);
- ok(!ret, "Created %d files with a limit of %d simultaneously-opened file descriptor",
- files_to_create, TRACKER_FD_LIMIT);
- diag("Check file descriptor count after opening %u files", files_to_create);
- check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count +
- dir_handle_fd_count);
-
- /*
- * Open unsuspendable fds (stdin, stdout, stderr) and verify that the fd
- * cap is still respected.
- */
- diag("Check file descriptor count after adding %d unsuspendable fds",
- STDIO_FD_COUNT);
- track_std_fds(tracker);
- check_fd_count(TRACKER_FD_LIMIT + unknown_fds_count +
- dir_handle_fd_count);
- diag("Untrack unsuspendable file descriptors");
- untrack_std_fds(tracker);
- check_fd_count(TRACKER_FD_LIMIT + unknown_fds_count +
- dir_handle_fd_count);
-
- ret = cleanup_files(tracker, test_directory, files_to_create, handles,
- output_files);
- ok(!ret, "Close all opened filesystem handles");
- ret = rmdir(test_directory);
- ok(ret == 0, "Test directory is empty");
- fd_tracker_destroy(tracker);
- lttng_directory_handle_put(dir_handle);
-end:
- free(test_directory);
- free(unlinked_files_directory);
-}
-
-/*
- * Open more files than allowed by the fd tracker's cap and write,
- * byte-by-byte, and in round-robin, a string. The goal is to force
- * the fd tracker to suspend and resume the fs_handles often and
- * verify that the fd cap is always respected.
- *
- * The content of the files is also verified at the end.
- */
-static
-void test_suspendable_restore(void)
-{
- int ret;
- const int files_to_create = TRACKER_FD_LIMIT * 10;
- struct fd_tracker *tracker;
- char *output_files[files_to_create];
- struct fs_handle *handles[files_to_create];
- size_t content_index;
- int handle_index;
- bool write_success = true;
- bool fd_cap_respected = true;
- bool content_ok = true;
- struct lttng_directory_handle *dir_handle = NULL;
- int dir_handle_fd_count;
- char *test_directory = NULL, *unlinked_files_directory = NULL;
-
- memset(output_files, 0, sizeof(output_files));
- memset(handles, 0, sizeof(handles));
-
- get_temporary_directories(&test_directory, &unlinked_files_directory);
-
- tracker = fd_tracker_create(unlinked_files_directory, TRACKER_FD_LIMIT);
- if (!tracker) {
- goto end;
- }
-
- dir_handle = lttng_directory_handle_create(test_directory);
- LTTNG_ASSERT(dir_handle);
- dir_handle_fd_count = !!lttng_directory_handle_uses_fd(dir_handle);
-
- ret = open_files(tracker, dir_handle, files_to_create, handles,
- output_files);
- ok(!ret, "Created %d files with a limit of %d simultaneously-opened file descriptor",
- files_to_create, TRACKER_FD_LIMIT);
- diag("Check file descriptor count after opening %u files", files_to_create);
- check_fd_count(TRACKER_FD_LIMIT + STDIO_FD_COUNT + unknown_fds_count +
- dir_handle_fd_count);
-
- for (content_index = 0; content_index < sizeof(file_contents); content_index++) {
- for (handle_index = 0; handle_index < files_to_create; handle_index++) {
- int fd;
- struct fs_handle *handle = handles[handle_index];
- const char *path = output_files[handle_index];
-
- fd = fs_handle_get_fd(handle);
- if (fd < 0) {
- write_success = false;
- diag("Failed to restore fs_handle to %s",
- path);
- goto skip_write;
- }
-
- do {
- ret = write(fd, file_contents + content_index, 1);
- } while (ret < 0 && errno == EINTR);
-
- if (ret != 1) {
- write_success = false;
- PERROR("write() to %s failed", path);
- goto skip_write;
- }
-
- if (fd_count() > (TRACKER_FD_LIMIT + STDIO_FD_COUNT +
- unknown_fds_count +
- dir_handle_fd_count)) {
- fd_cap_respected = false;
- }
-
- fs_handle_put_fd(handle);
- }
- }
-skip_write:
- ok(write_success, "Wrote reference string to %d files",
- files_to_create);
- ok(fd_cap_respected, "FD tracker enforced the file descriptor cap");
-
- /* Validate the contents of the files. */
- for (handle_index = 0; handle_index < files_to_create; handle_index++) {
- struct stat fd_stat;
- const char *path = output_files[handle_index];
- char read_buf[sizeof(file_contents)];
- char *read_pos;
- size_t to_read = sizeof(read_buf);
- int fd;
-
- fd = lttng_directory_handle_open_file(
- dir_handle, path, O_RDONLY, 0);
- LTTNG_ASSERT(fd >= 0);
- ret = fstat(fd, &fd_stat);
- LTTNG_ASSERT(!ret);
- if (fd_stat.st_size != sizeof(file_contents)) {
- diag("Content size of file %s doesn't match, got %" PRId64 ", expected %zu",
- path, (int64_t) fd_stat.st_size,
- sizeof(file_contents));
- content_ok = false;
- (void) close(fd);
- break;
- }
-
- read_pos = read_buf;
- do {
- ret = read(fd, read_pos, to_read);
- if (ret > 0) {
- to_read -= ret;
- read_pos += ret;
- }
- } while (to_read && (ret < 0 && errno == EINTR));
- if (ret < 0) {
- content_ok = false;
- PERROR("Failed to read file %s", path);
- (void) close(fd);
- break;
- }
-
- if (strcmp(file_contents, read_buf)) {
- content_ok = false;
- diag("File content doesn't match the expectated string");
- (void) close(fd);
- break;
- }
- (void) close(fd);
- }
- ok(content_ok, "Files contain the expected content");
- ret = cleanup_files(tracker, test_directory, files_to_create, handles,
- output_files);
- ok(!ret, "Close all opened filesystem handles");
- ret = rmdir(test_directory);
- ok(ret == 0, "Test directory is empty");
- fd_tracker_destroy(tracker);
- lttng_directory_handle_put(dir_handle);
-end:
- free(test_directory);
- free(unlinked_files_directory);
-}
-
-static
-void test_unlink(void)
-{
- int ret;
- struct fd_tracker *tracker;
- const int handles_to_open = 2;
- struct fs_handle *handles[handles_to_open];
- struct fs_handle *new_handle = NULL;
- struct stat statbuf;
- struct lttng_directory_handle *dir_handle = NULL;
- const char file_name[] = "my_file";
- char *test_directory = NULL, *unlinked_files_directory = NULL;
- char *unlinked_file_zero = NULL, *unlinked_file_one = NULL;
- int fd;
-
- get_temporary_directories(&test_directory, &unlinked_files_directory);
- ret = asprintf(&unlinked_file_zero, "%s/%u", unlinked_files_directory,
- 0);
- LTTNG_ASSERT(ret > 0);
- ret = asprintf(&unlinked_file_one, "%s/%u", unlinked_files_directory,
- 1);
- LTTNG_ASSERT(ret > 0);
-
- tracker = fd_tracker_create(unlinked_files_directory, 1);
- if (!tracker) {
- goto end;
- }
-
- dir_handle = lttng_directory_handle_create(test_directory);
- LTTNG_ASSERT(dir_handle);
-
- /* Open two handles to the same file. */
- ret = open_same_file(tracker, dir_handle, file_name, handles_to_open,
- handles);
- ok(!ret, "Successfully opened %i handles to %s/%s", handles_to_open,
- test_directory, file_name);
- if (ret) {
- goto end;
- }
-
- /*
- * Unlinking the first handle should cause the file to be renamed
- * to '0'.
- */
- ret = fs_handle_unlink(handles[0]);
- ok(!ret, "Successfully unlinked the first handle to %s/%s",
- test_directory, file_name);
-
- /*
- * The original file should no longer exist on the file system, and a
- * new file named '0' should exist.
- */
- ok(lttng_directory_handle_stat(dir_handle, file_name, &statbuf) == -1 &&
- errno == ENOENT,
- "%s no longer present on file system after unlink",
- file_name);
- ok(lttng_directory_handle_stat(
- dir_handle, unlinked_file_zero, &statbuf) == 0,
- "%s exists on file system after unlink",
- unlinked_file_zero);
-
- /*
- * It should be possible to use the file descriptors of both handles.
- * Since only one file descriptor can be opened at once, this should
- * force the fd_tracker to suspend and restore the handles.
- */
- fd = fs_handle_get_fd(handles[0]);
- ok(fd >= 0, "Got fd from first handle");
-
- fd = fs_handle_get_fd(handles[1]);
- ok (fd < 0, "fd tracker does not allow two fds to be used at once");
-
- fs_handle_put_fd(handles[0]);
- fd = fs_handle_get_fd(handles[1]);
- ok(fd >= 0, "Got fd from second handle");
- fs_handle_put_fd(handles[1]);
-
- /* The second unlink should fail with -ENOENT. */
- ret = fs_handle_unlink(handles[1]);
- ok(ret == -ENOENT,
- "ENOENT is reported when attempting to unlink the second handle to %s/%s",
- test_directory, file_name);
-
- /*
- * Opening a new handle to 'my_file' should succeed.
- */
- ret = open_same_file(tracker, dir_handle, file_name, 1, &new_handle);
- ok(!ret, "Successfully opened a new handle to previously unlinked file %s/%s",
- test_directory, file_name);
- LTTNG_ASSERT(new_handle);
-
- /*
- * Unlinking the new handle should cause the file to be renamed
- * to '1' since '0' already exists.
- */
- ret = fs_handle_unlink(new_handle);
- ok(!ret, "Successfully unlinked the new handle handle to %s/%s",
- test_directory, file_name);
- ok(stat(unlinked_file_one, &statbuf) == 0,
- "%s exists on file system after unlink",
- unlinked_file_one);
-
- ret = fs_handle_close(handles[0]);
- ok(!ret, "Successfully closed the first handle");
- ret = fs_handle_close(handles[1]);
- ok(!ret, "Successfully closed the second handle");
- ret = fs_handle_close(new_handle);
- ok(!ret, "Successfully closed the third handle");
-
- ok(lttng_directory_handle_stat(dir_handle, file_name, &statbuf) == -1 &&
- errno == ENOENT,
- "%s no longer present on file system after handle close",
- file_name);
- ok(lttng_directory_handle_stat(
- dir_handle, unlinked_file_zero, &statbuf) == -1 &&
- errno == ENOENT,
- "%s no longer present on file system after handle close",
- unlinked_file_zero);
- ok(lttng_directory_handle_stat(dir_handle, unlinked_file_one,
- &statbuf) == -1 &&
- errno == ENOENT,
- "%s no longer present on file system after handle close",
- unlinked_file_one);
-
- ret = rmdir(test_directory);
- ok(ret == 0, "Test directory is empty");
-end:
- fd_tracker_destroy(tracker);
- free(test_directory);
- free(unlinked_files_directory);
- free(unlinked_file_zero);
- free(unlinked_file_one);
- lttng_directory_handle_put(dir_handle);
-}
-
-int main(int argc, char **argv)
-{
- plan_tests(NUM_TESTS);
- diag("File descriptor tracker unit tests");
-
- rcu_register_thread();
-
- unknown_fds_count = fd_count() - STDIO_FD_COUNT;
- LTTNG_ASSERT(unknown_fds_count >= 0);
-
- diag("Unsuspendable - basic");
- test_unsuspendable_basic();
- diag("Unsuspendable - callback return values");
- test_unsuspendable_cb_return();
- diag("Unsuspendable - duplicate file descriptors");
- test_unsuspendable_duplicate();
- diag("Unsuspendable - closing an untracked file descriptor");
- test_unsuspendable_close_untracked();
- diag("Unsuspendable - check that file descriptor limit is enforced");
- test_unsuspendable_limit();
-
- diag("Suspendable - check that file descriptor limit is enforced");
- test_suspendable_limit();
- diag("Suspendable - restoration test");
- test_suspendable_restore();
-
- diag("Mixed - check that file descriptor limit is enforced");
- test_mixed_limit();
-
- diag("Suspendable - Unlinking test");
- test_unlink();
-
- rcu_barrier();
- rcu_unregister_thread();
- return exit_status();
-}
projects / lttng-tools.git / blobdiff