38  * Return -1 if a process is userspace process.
49 	if (dir_fd == -1)  in kernel_thread_fd()
50 		return -1;  in kernel_thread_fd()
57 	if (fd == -1) {  in kernel_thread_fd()
59 		return -1;  in kernel_thread_fd()
68 		assert(buf[rv - 1] == '\n');  in kernel_thread_fd()
69 		buf[rv - 1] = '\0';  in kernel_thread_fd()
71 		/* Search backwards: ->comm can contain whitespace and ')'. */  in kernel_thread_fd()
81 		flags_ull = xstrtoull(p + 1, &end);  in kernel_thread_fd()
88 	fd = -1;  in kernel_thread_fd()
105 	assert(streq(de->d_name, "."));  in test_readdir()
106 	assert(de->d_type == DT_DIR);  in test_readdir()
109 	assert(streq(de->d_name, ".."));  in test_readdir()
110 	assert(de->d_type == DT_DIR);  in test_readdir()
128 	assert(rv == -1 && errno == ENOENT);  in test_lookup_fail()
137 	for (i = INT_MIN; i < INT_MIN + 1024; i++) {  in test_lookup()
141 	for (i = -1024; i < 1024; i++) {  in test_lookup()
145 	for (u = INT_MAX - 1024; u < (unsigned int)INT_MAX + 1024; u++) {  in test_lookup()
149 	for (u = UINT_MAX - 1024; u != 0; u++) {  in test_lookup()
167 	while ((fd = kernel_thread_fd(pid)) == -1 && pid < 1024) {  in main()
170 	/* EACCES if run as non-root. */  in main()
171 	if (pid >= 1024)  in main()
172 		return 1;  in main()