// SPDX-License-Identifier: GPL-2.0
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#include <dirent.h>
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#include <stdlib.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <api/fs/fs.h>
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#include "util.h"
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#include "machine.h"
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#include "symbol.h"
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#include "tests.h"
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#include "debug.h"
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static char *test_file(int size)
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{
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#define TEMPL "/tmp/perf-test-XXXXXX"
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static char buf_templ[sizeof(TEMPL)];
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char *templ = buf_templ;
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int fd, i;
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unsigned char *buf;
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strcpy(buf_templ, TEMPL);
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#undef TEMPL
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fd = mkstemp(templ);
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if (fd < 0) {
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perror("mkstemp failed");
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return NULL;
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}
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buf = malloc(size);
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if (!buf) {
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close(fd);
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return NULL;
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}
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for (i = 0; i < size; i++)
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buf[i] = (unsigned char) ((int) i % 10);
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if (size != write(fd, buf, size))
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templ = NULL;
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free(buf);
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close(fd);
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return templ;
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}
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#define TEST_FILE_SIZE (DSO__DATA_CACHE_SIZE * 20)
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struct test_data_offset {
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off_t offset;
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u8 data[10];
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int size;
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};
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struct test_data_offset offsets[] = {
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/* Fill first cache page. */
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{
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.offset = 10,
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.data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
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.size = 10,
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},
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/* Read first cache page. */
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{
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.offset = 10,
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.data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
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.size = 10,
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},
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/* Fill cache boundary pages. */
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{
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.offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
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.data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
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.size = 10,
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},
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/* Read cache boundary pages. */
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{
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.offset = DSO__DATA_CACHE_SIZE - DSO__DATA_CACHE_SIZE % 10,
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.data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
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.size = 10,
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},
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/* Fill final cache page. */
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{
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.offset = TEST_FILE_SIZE - 10,
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.data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
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.size = 10,
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},
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/* Read final cache page. */
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{
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.offset = TEST_FILE_SIZE - 10,
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.data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 },
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.size = 10,
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},
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/* Read final cache page. */
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{
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.offset = TEST_FILE_SIZE - 3,
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.data = { 7, 8, 9, 0, 0, 0, 0, 0, 0, 0 },
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.size = 3,
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},
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};
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/* move it from util/dso.c for compatibility */
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static int dso__data_fd(struct dso *dso, struct machine *machine)
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{
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int fd = dso__data_get_fd(dso, machine);
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if (fd >= 0)
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dso__data_put_fd(dso);
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return fd;
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}
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int test__dso_data(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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struct machine machine;
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struct dso *dso;
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char *file = test_file(TEST_FILE_SIZE);
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size_t i;
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TEST_ASSERT_VAL("No test file", file);
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memset(&machine, 0, sizeof(machine));
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dso = dso__new((const char *)file);
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TEST_ASSERT_VAL("Failed to access to dso",
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dso__data_fd(dso, &machine) >= 0);
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/* Basic 10 bytes tests. */
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for (i = 0; i < ARRAY_SIZE(offsets); i++) {
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struct test_data_offset *data = &offsets[i];
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ssize_t size;
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u8 buf[10];
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memset(buf, 0, 10);
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size = dso__data_read_offset(dso, &machine, data->offset,
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buf, 10);
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TEST_ASSERT_VAL("Wrong size", size == data->size);
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TEST_ASSERT_VAL("Wrong data", !memcmp(buf, data->data, 10));
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}
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/* Read cross multiple cache pages. */
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{
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ssize_t size;
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int c;
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u8 *buf;
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buf = malloc(TEST_FILE_SIZE);
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TEST_ASSERT_VAL("ENOMEM\n", buf);
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/* First iteration to fill caches, second one to read them. */
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for (c = 0; c < 2; c++) {
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memset(buf, 0, TEST_FILE_SIZE);
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size = dso__data_read_offset(dso, &machine, 10,
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buf, TEST_FILE_SIZE);
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TEST_ASSERT_VAL("Wrong size",
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size == (TEST_FILE_SIZE - 10));
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for (i = 0; i < (size_t)size; i++)
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TEST_ASSERT_VAL("Wrong data",
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buf[i] == (i % 10));
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}
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free(buf);
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}
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dso__put(dso);
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unlink(file);
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return 0;
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}
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static long open_files_cnt(void)
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{
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char path[PATH_MAX];
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struct dirent *dent;
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DIR *dir;
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long nr = 0;
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scnprintf(path, PATH_MAX, "%s/self/fd", procfs__mountpoint());
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pr_debug("fd path: %s\n", path);
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dir = opendir(path);
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TEST_ASSERT_VAL("failed to open fd directory", dir);
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while ((dent = readdir(dir)) != NULL) {
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if (!strcmp(dent->d_name, ".") ||
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!strcmp(dent->d_name, ".."))
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continue;
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nr++;
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}
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closedir(dir);
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return nr - 1;
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}
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static struct dso **dsos;
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static int dsos__create(int cnt, int size)
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{
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int i;
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dsos = malloc(sizeof(*dsos) * cnt);
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TEST_ASSERT_VAL("failed to alloc dsos array", dsos);
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for (i = 0; i < cnt; i++) {
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char *file;
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file = test_file(size);
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TEST_ASSERT_VAL("failed to get dso file", file);
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dsos[i] = dso__new(file);
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TEST_ASSERT_VAL("failed to get dso", dsos[i]);
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}
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return 0;
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}
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static void dsos__delete(int cnt)
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{
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int i;
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for (i = 0; i < cnt; i++) {
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struct dso *dso = dsos[i];
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unlink(dso->name);
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dso__put(dso);
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}
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free(dsos);
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}
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static int set_fd_limit(int n)
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{
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struct rlimit rlim;
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if (getrlimit(RLIMIT_NOFILE, &rlim))
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return -1;
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pr_debug("file limit %ld, new %d\n", (long) rlim.rlim_cur, n);
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rlim.rlim_cur = n;
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return setrlimit(RLIMIT_NOFILE, &rlim);
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}
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int test__dso_data_cache(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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struct machine machine;
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long nr_end, nr = open_files_cnt();
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int dso_cnt, limit, i, fd;
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/* Rest the internal dso open counter limit. */
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reset_fd_limit();
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memset(&machine, 0, sizeof(machine));
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/* set as system limit */
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limit = nr * 4;
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TEST_ASSERT_VAL("failed to set file limit", !set_fd_limit(limit));
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/* and this is now our dso open FDs limit */
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dso_cnt = limit / 2;
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TEST_ASSERT_VAL("failed to create dsos\n",
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!dsos__create(dso_cnt, TEST_FILE_SIZE));
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for (i = 0; i < (dso_cnt - 1); i++) {
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struct dso *dso = dsos[i];
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/*
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* Open dsos via dso__data_fd(), it opens the data
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* file and keep it open (unless open file limit).
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*/
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fd = dso__data_fd(dso, &machine);
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TEST_ASSERT_VAL("failed to get fd", fd > 0);
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if (i % 2) {
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#define BUFSIZE 10
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u8 buf[BUFSIZE];
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ssize_t n;
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n = dso__data_read_offset(dso, &machine, 0, buf, BUFSIZE);
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TEST_ASSERT_VAL("failed to read dso", n == BUFSIZE);
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}
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}
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/* verify the first one is already open */
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TEST_ASSERT_VAL("dsos[0] is not open", dsos[0]->data.fd != -1);
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/* open +1 dso to reach the allowed limit */
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fd = dso__data_fd(dsos[i], &machine);
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TEST_ASSERT_VAL("failed to get fd", fd > 0);
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/* should force the first one to be closed */
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TEST_ASSERT_VAL("failed to close dsos[0]", dsos[0]->data.fd == -1);
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/* cleanup everything */
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dsos__delete(dso_cnt);
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/* Make sure we did not leak any file descriptor. */
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nr_end = open_files_cnt();
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pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
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TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
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return 0;
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}
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int test__dso_data_reopen(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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struct machine machine;
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long nr_end, nr = open_files_cnt();
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int fd, fd_extra;
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#define dso_0 (dsos[0])
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#define dso_1 (dsos[1])
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#define dso_2 (dsos[2])
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/* Rest the internal dso open counter limit. */
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reset_fd_limit();
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memset(&machine, 0, sizeof(machine));
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/*
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* Test scenario:
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* - create 3 dso objects
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* - set process file descriptor limit to current
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* files count + 3
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* - test that the first dso gets closed when we
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* reach the files count limit
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*/
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/* Make sure we are able to open 3 fds anyway */
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TEST_ASSERT_VAL("failed to set file limit",
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!set_fd_limit((nr + 3)));
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TEST_ASSERT_VAL("failed to create dsos\n", !dsos__create(3, TEST_FILE_SIZE));
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/* open dso_0 */
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fd = dso__data_fd(dso_0, &machine);
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TEST_ASSERT_VAL("failed to get fd", fd > 0);
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/* open dso_1 */
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fd = dso__data_fd(dso_1, &machine);
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TEST_ASSERT_VAL("failed to get fd", fd > 0);
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/*
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* open extra file descriptor and we just
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* reached the files count limit
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*/
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fd_extra = open("/dev/null", O_RDONLY);
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TEST_ASSERT_VAL("failed to open extra fd", fd_extra > 0);
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/* open dso_2 */
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fd = dso__data_fd(dso_2, &machine);
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TEST_ASSERT_VAL("failed to get fd", fd > 0);
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/*
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* dso_0 should get closed, because we reached
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* the file descriptor limit
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*/
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TEST_ASSERT_VAL("failed to close dso_0", dso_0->data.fd == -1);
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/* open dso_0 */
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fd = dso__data_fd(dso_0, &machine);
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TEST_ASSERT_VAL("failed to get fd", fd > 0);
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/*
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* dso_1 should get closed, because we reached
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* the file descriptor limit
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*/
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TEST_ASSERT_VAL("failed to close dso_1", dso_1->data.fd == -1);
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/* cleanup everything */
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close(fd_extra);
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dsos__delete(3);
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/* Make sure we did not leak any file descriptor. */
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nr_end = open_files_cnt();
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pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end);
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TEST_ASSERT_VAL("failed leadking files", nr == nr_end);
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return 0;
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}
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