/* SPDX-License-Identifier: LGPL-2.1+ */ /*** This file is part of systemd. Copyright 2010 Lennart Poettering ***/ #include #include #include "alloc-util.h" #include "fd-util.h" #include "fileio.h" #include "macro.h" #include "path-util.h" #include "process-util.h" #include "random-util.h" #include "string-util.h" #include "util.h" static void test_close_many(void) { int fds[3]; char name0[] = "/tmp/test-close-many.XXXXXX"; char name1[] = "/tmp/test-close-many.XXXXXX"; char name2[] = "/tmp/test-close-many.XXXXXX"; fds[0] = mkostemp_safe(name0); fds[1] = mkostemp_safe(name1); fds[2] = mkostemp_safe(name2); close_many(fds, 2); assert_se(fcntl(fds[0], F_GETFD) == -1); assert_se(fcntl(fds[1], F_GETFD) == -1); assert_se(fcntl(fds[2], F_GETFD) >= 0); safe_close(fds[2]); unlink(name0); unlink(name1); unlink(name2); } static void test_close_nointr(void) { char name[] = "/tmp/test-test-close_nointr.XXXXXX"; int fd; fd = mkostemp_safe(name); assert_se(fd >= 0); assert_se(close_nointr(fd) >= 0); assert_se(close_nointr(fd) < 0); unlink(name); } #if 0 /// UNNEEDED by elogind static void test_same_fd(void) { _cleanup_close_pair_ int p[2] = { -1, -1 }; _cleanup_close_ int a = -1, b = -1, c = -1; assert_se(pipe2(p, O_CLOEXEC) >= 0); assert_se((a = fcntl(p[0], F_DUPFD, 3)) >= 0); assert_se((b = open("/dev/null", O_RDONLY|O_CLOEXEC)) >= 0); assert_se((c = fcntl(a, F_DUPFD, 3)) >= 0); assert_se(same_fd(p[0], p[0]) > 0); assert_se(same_fd(p[1], p[1]) > 0); assert_se(same_fd(a, a) > 0); assert_se(same_fd(b, b) > 0); assert_se(same_fd(a, p[0]) > 0); assert_se(same_fd(p[0], a) > 0); assert_se(same_fd(c, p[0]) > 0); assert_se(same_fd(p[0], c) > 0); assert_se(same_fd(a, c) > 0); assert_se(same_fd(c, a) > 0); assert_se(same_fd(p[0], p[1]) == 0); assert_se(same_fd(p[1], p[0]) == 0); assert_se(same_fd(p[0], b) == 0); assert_se(same_fd(b, p[0]) == 0); assert_se(same_fd(p[1], a) == 0); assert_se(same_fd(a, p[1]) == 0); assert_se(same_fd(p[1], b) == 0); assert_se(same_fd(b, p[1]) == 0); assert_se(same_fd(a, b) == 0); assert_se(same_fd(b, a) == 0); } #endif // 0 static void test_open_serialization_fd(void) { _cleanup_close_ int fd = -1; fd = open_serialization_fd("test"); assert_se(fd >= 0); assert_se(write(fd, "test\n", 5) == 5); } static void test_acquire_data_fd_one(unsigned flags) { char wbuffer[196*1024 - 7]; char rbuffer[sizeof(wbuffer)]; int fd; fd = acquire_data_fd("foo", 3, flags); assert_se(fd >= 0); zero(rbuffer); assert_se(read(fd, rbuffer, sizeof(rbuffer)) == 3); assert_se(streq(rbuffer, "foo")); fd = safe_close(fd); fd = acquire_data_fd("", 0, flags); assert_se(fd >= 0); zero(rbuffer); assert_se(read(fd, rbuffer, sizeof(rbuffer)) == 0); assert_se(streq(rbuffer, "")); fd = safe_close(fd); random_bytes(wbuffer, sizeof(wbuffer)); fd = acquire_data_fd(wbuffer, sizeof(wbuffer), flags); assert_se(fd >= 0); zero(rbuffer); assert_se(read(fd, rbuffer, sizeof(rbuffer)) == sizeof(rbuffer)); assert_se(memcmp(rbuffer, wbuffer, sizeof(rbuffer)) == 0); fd = safe_close(fd); } static void test_acquire_data_fd(void) { test_acquire_data_fd_one(0); test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL); test_acquire_data_fd_one(ACQUIRE_NO_MEMFD); test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_MEMFD); test_acquire_data_fd_one(ACQUIRE_NO_PIPE); test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_PIPE); test_acquire_data_fd_one(ACQUIRE_NO_MEMFD|ACQUIRE_NO_PIPE); test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_MEMFD|ACQUIRE_NO_PIPE); test_acquire_data_fd_one(ACQUIRE_NO_DEV_NULL|ACQUIRE_NO_MEMFD|ACQUIRE_NO_PIPE|ACQUIRE_NO_TMPFILE); } static void test_fd_move_above_stdio(void) { int original_stdin, new_fd; original_stdin = fcntl(0, F_DUPFD, 3); assert_se(original_stdin >= 3); assert_se(close_nointr(0) != EBADF); new_fd = open("/dev/null", O_RDONLY); assert_se(new_fd == 0); new_fd = fd_move_above_stdio(new_fd); assert_se(new_fd >= 3); assert_se(dup(original_stdin) == 0); assert_se(close_nointr(original_stdin) != EBADF); assert_se(close_nointr(new_fd) != EBADF); } static void test_rearrange_stdio(void) { pid_t pid; int r; r = safe_fork("rearrange", FORK_WAIT|FORK_LOG, &pid); assert_se(r >= 0); if (r == 0) { _cleanup_free_ char *path = NULL; char buffer[10]; /* Child */ safe_close(STDERR_FILENO); /* Let's close an fd < 2, to make it more interesting */ assert_se(rearrange_stdio(-1, -1, -1) >= 0); assert_se(fd_get_path(STDIN_FILENO, &path) >= 0); assert_se(path_equal(path, "/dev/null")); path = mfree(path); assert_se(fd_get_path(STDOUT_FILENO, &path) >= 0); assert_se(path_equal(path, "/dev/null")); path = mfree(path); assert_se(fd_get_path(STDOUT_FILENO, &path) >= 0); assert_se(path_equal(path, "/dev/null")); path = mfree(path); safe_close(STDIN_FILENO); safe_close(STDOUT_FILENO); safe_close(STDERR_FILENO); { int pair[2]; assert_se(pipe(pair) >= 0); assert_se(pair[0] == 0); assert_se(pair[1] == 1); assert_se(fd_move_above_stdio(0) == 3); } assert_se(open("/dev/full", O_WRONLY|O_CLOEXEC) == 0); assert_se(acquire_data_fd("foobar", 6, 0) == 2); assert_se(rearrange_stdio(2, 0, 1) >= 0); assert_se(write(1, "x", 1) < 0 && errno == ENOSPC); assert_se(write(2, "z", 1) == 1); assert_se(read(3, buffer, sizeof(buffer)) == 1); assert_se(buffer[0] == 'z'); assert_se(read(0, buffer, sizeof(buffer)) == 6); assert_se(memcmp(buffer, "foobar", 6) == 0); assert_se(rearrange_stdio(-1, 1, 2) >= 0); assert_se(write(1, "a", 1) < 0 && errno == ENOSPC); assert_se(write(2, "y", 1) == 1); assert_se(read(3, buffer, sizeof(buffer)) == 1); assert_se(buffer[0] == 'y'); assert_se(fd_get_path(0, &path) >= 0); assert_se(path_equal(path, "/dev/null")); path = mfree(path); _exit(EXIT_SUCCESS); } } int main(int argc, char *argv[]) { test_close_many(); test_close_nointr(); #if 0 /// UNNEEDED by elogind test_same_fd(); #endif // 0 test_open_serialization_fd(); test_acquire_data_fd(); test_fd_move_above_stdio(); test_rearrange_stdio(); return 0; }