{"id":2220089,"url":"http://patchwork.ozlabs.org/api/patches/2220089/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/patch/20260406100311.79619-1-abdulla1@linux.ibm.com/","project":{"id":59,"url":"http://patchwork.ozlabs.org/api/projects/59/?format=json","name":"Linux Test Project development","link_name":"ltp","list_id":"ltp.lists.linux.it","list_email":"ltp@lists.linux.it","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260406100311.79619-1-abdulla1@linux.ibm.com>","list_archive_url":null,"date":"2026-04-06T10:03:11","name":"syscalls/ioctl02: Move TTY discovery from shell to C","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"6a1eadd0caf1deea4290e04268cb62d30d9a1343","submitter":{"id":93068,"url":"http://patchwork.ozlabs.org/api/people/93068/?format=json","name":"Abdulla","email":"abdulla1@linux.ibm.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/ltp/patch/20260406100311.79619-1-abdulla1@linux.ibm.com/mbox/","series":[{"id":498834,"url":"http://patchwork.ozlabs.org/api/series/498834/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/list/?series=498834","date":"2026-04-06T10:03:11","name":"syscalls/ioctl02: Move TTY discovery from shell to C","version":1,"mbox":"http://patchwork.ozlabs.org/series/498834/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2220089/comments/","check":"warning","checks":"http://patchwork.ozlabs.org/api/patches/2220089/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=TNZb38nZ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "},"content":"The test previously required a shell wrapper to discover and validate\nTTY devices. This modernization moves all TTY discovery logic into C,\neliminating the shell dependency.\n\nKey changes:\n- Added is_valid_tty_name() for pattern matching tty[0-9]*\n- Added is_valid_tty_device() for ioctl-based validation\n- Added find_valid_ttys() for /dev directory scanning\n- Made device parameter optional with auto-discovery mode\n- Extracted test_single_device() for code reusability\n\nThe test now supports two modes:\n1. Single device: ./ioctl02 -d /dev/tty1 (backward compatible)\n2. Auto-discovery: ./ioctl02 (discovers all valid TTY devices)\n\nSigned-off-by: Shaik Abdulla \n---\n .../syscalls/ioctl/ioctl02_modernized.c | 431 ++++++++++++++++++\n 1 file changed, 431 insertions(+)\n create mode 100644 testcases/kernel/syscalls/ioctl/ioctl02_modernized.c","diff":"diff --git a/testcases/kernel/syscalls/ioctl/ioctl02_modernized.c b/testcases/kernel/syscalls/ioctl/ioctl02_modernized.c\nnew file mode 100644\nindex 000000000..44b43db19\n--- /dev/null\n+++ b/testcases/kernel/syscalls/ioctl/ioctl02_modernized.c\n@@ -0,0 +1,431 @@\n+// SPDX-License-Identifier: GPL-2.0-or-later\n+/*\n+ * Copyright (c) International Business Machines Corp., 2001\n+ * Copyright (c) 2020 Petr Vorel \n+ * Copyright (c) 2023 Marius Kittler \n+ * Copyright (c) 2026 Modernization - TTY discovery moved from shell to C\n+ */\n+\n+/*\\\n+ * Test TCGETA/TCGETS and TCSETA/TCSETS ioctl implementations for tty driver.\n+ *\n+ * This test can operate in two modes:\n+ * 1. Single device mode: Use -d option to test a specific TTY device\n+ * 2. Auto-discovery mode: Automatically discovers and tests all valid /dev/tty[0-9]* devices\n+ *\n+ * In this test, the parent and child open the parentty and the childtty\n+ * respectively. After opening the childtty the child flushes the stream\n+ * and wakes the parent (thereby asking it to continue its testing). The\n+ * parent, then starts the testing. It issues a TCGETA/TCGETS ioctl to\n+ * get all the tty parameters. It then changes them to known values by\n+ * issuing a TCSETA/TCSETS ioctl. Then the parent issues a TCSETA/TCGETS\n+ * ioctl again and compares the received values with what it had set\n+ * earlier. The test fails if TCGETA/TCGETS or TCSETA/TCSETS fails, or if\n+ * the received values don't match those that were set. The parent does\n+ * all the testing, the requirement of the child process is to moniter\n+ * the testing done by the parent, and hence the child just waits for the\n+ * parent.\n+ */\n+\n+#include \n+#include \n+#include \n+#include \n+#include \n+#include \n+#include \n+\n+#include \"lapi/ioctl.h\"\n+#include \"tst_test.h\"\n+\n+#define MAX_TTYS 100\n+#define TTY_PATH_MAX 256\n+\n+static struct termio termio, termio_exp;\n+static struct termios termios, termios_exp, termios_bak;\n+\n+static char *parenttty, *childtty;\n+static int parentfd = -1;\n+static int parentpid, childpid;\n+\n+/* TTY device list for auto-discovery mode */\n+static char *tty_list[MAX_TTYS];\n+static int tty_count = 0;\n+\n+static void do_child(void);\n+static void prepare_termio(void);\n+static void run_ptest(void);\n+static void chk_tty_parms_termio(void);\n+static void chk_tty_parms_termios(void);\n+static void setup(void);\n+static void cleanup(void);\n+static void test_single_device(const char *dev);\n+static void find_valid_ttys(void);\n+static void free_tty_list(void);\n+static int is_valid_tty_name(const char *name);\n+static int is_valid_tty_device(const char *path);\n+\n+static char *device;\n+\n+static struct variant {\n+\tconst char *name;\n+\tvoid *termio, *termio_exp, *termio_bak;\n+\tsize_t termio_size;\n+\tvoid (*check)(void);\n+\tint tcget, tcset;\n+} variants[] = {\n+\t{\n+\t\t.name = \"termio\",\n+\t\t.termio = &termio,\n+\t\t.termio_exp = &termio_exp,\n+\t\t.termio_size = sizeof(termio),\n+\t\t.check = &chk_tty_parms_termio,\n+\t\t.tcget = TCGETA,\n+\t\t.tcset = TCSETA,\n+\t},\n+\t{\n+\t\t.name = \"termios\",\n+\t\t.termio = &termios,\n+\t\t.termio_exp = &termios_exp,\n+\t\t.termio_size = sizeof(termios),\n+\t\t.check = &chk_tty_parms_termios,\n+\t\t.tcget = TCGETS,\n+\t\t.tcset = TCSETS,\n+\t},\n+};\n+\n+/*\n+ * is_valid_tty_name() - Check if device name matches tty[0-9] or tty[0-9][0-9]\n+ */\n+static int is_valid_tty_name(const char *name)\n+{\n+\tconst char *device_no;\n+\n+\t/* Must start with \"tty\" */\n+\tif (strncmp(name, \"tty\", 3) != 0)\n+\t\treturn 0;\n+\n+\tdevice_no = name + 3;\n+\n+\t/* Must have at least one digit */\n+\tif (!isdigit(device_no[0]))\n+\t\treturn 0;\n+\n+\t/* If there's a second character, it must be a digit */\n+\tif (device_no[1] != '\\0' && !isdigit(device_no[1]))\n+\t\treturn 0;\n+\n+\t/* Must not have more than 2 digits */\n+\tif (device_no[1] != '\\0' && device_no[2] != '\\0')\n+\t\treturn 0;\n+\n+\treturn 1;\n+}\n+\n+/*\n+ * is_valid_tty_device() - Validate TTY device by attempting ioctl\n+ * This replaces the shell's \"stty -F\" validation\n+ */\n+static int is_valid_tty_device(const char *path)\n+{\n+\tint fd;\n+\tstruct termios t;\n+\tint ret;\n+\n+\t/* Try to open device with non-blocking flag */\n+\tfd = open(path, O_RDWR | O_NONBLOCK);\n+\tif (fd < 0)\n+\t\treturn 0;\n+\n+\t/* Try to get terminal attributes - this validates it's a real TTY */\n+\tret = ioctl(fd, TCGETS, &t);\n+\tclose(fd);\n+\n+\treturn (ret == 0);\n+}\n+\n+/*\n+ * find_valid_ttys() - Discover all valid TTY devices in /dev\n+ * This replaces the shell wrapper's \"for tttype in `ls /dev/tty*`\" logic\n+ */\n+static void find_valid_ttys(void)\n+{\n+\tDIR *dir;\n+\tstruct dirent *entry;\n+\tchar tty_path[TTY_PATH_MAX];\n+\n+\tdir = opendir(\"/dev\");\n+\tif (!dir)\n+\t\ttst_brk(TBROK | TERRNO, \"Cannot open /dev directory\");\n+\n+\ttst_res(TINFO, \"Scanning /dev for valid TTY devices...\");\n+\n+\twhile ((entry = readdir(dir)) != NULL) {\n+\t\t/* Check if name matches tty[0-9] or tty[0-9][0-9] pattern */\n+\t\tif (!is_valid_tty_name(entry->d_name))\n+\t\t\tcontinue;\n+\n+\t\t/* Build full path */\n+\t\tsnprintf(tty_path, sizeof(tty_path), \"/dev/%s\", entry->d_name);\n+\n+\t\t/* Validate it's a working TTY device */\n+\t\tif (!is_valid_tty_device(tty_path)) {\n+\t\t\ttst_res(TINFO, \"Skipping %s (not a valid TTY)\", tty_path);\n+\t\t\tcontinue;\n+\t\t}\n+\n+\t\t/* Add to list if we have space */\n+\t\tif (tty_count >= MAX_TTYS) {\n+\t\t\ttst_res(TWARN, \"Too many TTY devices found, skipping %s\", tty_path);\n+\t\t\tcontinue;\n+\t\t}\n+\n+\t\ttty_list[tty_count] = strdup(tty_path);\n+\t\tif (!tty_list[tty_count])\n+\t\t\ttst_brk(TBROK | TERRNO, \"Failed to allocate memory for TTY path\");\n+\n+\t\ttst_res(TINFO, \"Found valid TTY device: %s\", tty_path);\n+\t\ttty_count++;\n+\t}\n+\n+\tclosedir(dir);\n+\n+\tif (tty_count == 0)\n+\t\ttst_brk(TBROK, \"No valid TTY devices found in /dev\");\n+\n+\ttst_res(TINFO, \"Total valid TTY devices found: %d\", tty_count);\n+}\n+\n+/*\n+ * free_tty_list() - Free allocated TTY device paths\n+ */\n+static void free_tty_list(void)\n+{\n+\tint i;\n+\n+\tfor (i = 0; i < tty_count; i++) {\n+\t\tif (tty_list[i]) {\n+\t\t\tfree(tty_list[i]);\n+\t\t\ttty_list[i] = NULL;\n+\t\t}\n+\t}\n+\ttty_count = 0;\n+}\n+\n+/*\n+ * test_single_device() - Test a single TTY device\n+ * Extracted from verify_ioctl() to support both single and multi-device modes\n+ */\n+static void test_single_device(const char *dev)\n+{\n+\tparenttty = childtty = (char *)dev;\n+\n+\tparentpid = getpid();\n+\tchildpid = SAFE_FORK();\n+\tif (!childpid) {\n+\t\tdo_child();\n+\t\texit(EXIT_SUCCESS);\n+\t}\n+\n+\tTST_CHECKPOINT_WAIT(0);\n+\n+\tparentfd = SAFE_OPEN(parenttty, O_RDWR, 0777);\n+\tSAFE_IOCTL(parentfd, TCFLSH, TCIOFLUSH);\n+\n+\trun_ptest();\n+\n+\tTST_CHECKPOINT_WAKE(0);\n+\tSAFE_CLOSE(parentfd);\n+\tparentfd = -1;\n+}\n+\n+static void verify_ioctl(void)\n+{\n+\tint i;\n+\n+\ttst_res(TINFO, \"Testing %s variant\", variants[tst_variant].name);\n+\n+\tif (device) {\n+\t\t/* Single device mode - test specified device only */\n+\t\ttst_res(TINFO, \"Single device mode: testing %s\", device);\n+\t\ttest_single_device(device);\n+\t} else {\n+\t\t/* Auto-discovery mode - find and test all valid TTYs */\n+\t\ttst_res(TINFO, \"Auto-discovery mode: scanning for TTY devices\");\n+\t\tfind_valid_ttys();\n+\n+\t\tfor (i = 0; i < tty_count; i++) {\n+\t\t\ttst_res(TINFO, \"Testing device %d/%d: %s\",\n+\t\t\t\ti + 1, tty_count, tty_list[i]);\n+\t\t\ttest_single_device(tty_list[i]);\n+\t\t}\n+\n+\t\tfree_tty_list();\n+\t}\n+}\n+\n+static void prepare_termio(void)\n+{\n+\t/* Use \"old\" line discipline */\n+\ttermios_exp.c_line = termio_exp.c_line = 0;\n+\n+\t/* Set control modes */\n+\ttermios_exp.c_cflag = termio_exp.c_cflag = B50 | CS7 | CREAD | PARENB | PARODD | CLOCAL;\n+\n+\t/* Set control chars. */\n+\tfor (int i = 0; i < NCC; i++)\n+\t\ttermio_exp.c_cc[i] = CSTART;\n+\tfor (int i = 0; i < VEOL2; i++)\n+\t\ttermios_exp.c_cc[i] = CSTART;\n+\n+\t/* Set local modes. */\n+\ttermios_exp.c_lflag = termio_exp.c_lflag =\n+\t ((unsigned short)(ISIG | ICANON | XCASE | ECHO | ECHOE | NOFLSH));\n+\n+\t/* Set input modes. */\n+\ttermios_exp.c_iflag = termio_exp.c_iflag =\n+\t BRKINT | IGNPAR | INPCK | ISTRIP | ICRNL | IUCLC | IXON | IXANY |\n+\t IXOFF;\n+\n+\t/* Set output modes. */\n+\ttermios_exp.c_oflag = termio_exp.c_oflag = OPOST | OLCUC | ONLCR | ONOCR;\n+}\n+\n+/*\n+ * run_ptest() - setup the various termio/termios structure values and issue\n+ * the TCSETA/TCSETS ioctl call with the TEST macro.\n+ */\n+static void run_ptest(void)\n+{\n+\tstruct variant *v = &variants[tst_variant];\n+\n+\t/* Init termio/termios structures used to check if all params got set */\n+\tmemset(v->termio, 0, v->termio_size);\n+\n+\tSAFE_IOCTL(parentfd, v->tcset, v->termio_exp);\n+\n+\t/* Get termio and see if all parameters actually got set */\n+\tSAFE_IOCTL(parentfd, v->tcget, v->termio);\n+\tv->check();\n+}\n+\n+static int cmp_attr(unsigned long long exp, unsigned long long act, const char *attr)\n+{\n+\tif (act == exp)\n+\t\treturn 0;\n+\ttst_res(TFAIL, \"%s has incorrect value %llu, expected %llu\",\n+\t\tattr, act, exp);\n+\treturn 1;\n+}\n+\n+static int cmp_c_cc(unsigned char *exp_c_cc, unsigned char *act_c_cc, int ncc)\n+{\n+\tint i, fails = 0;\n+\tchar what[32];\n+\n+\tfor (i = 0; i < ncc; ++i) {\n+\t\tsprintf(what, \"control char %d\", i);\n+\t\tfails += cmp_attr(exp_c_cc[i], act_c_cc[i], what);\n+\t}\n+\treturn fails;\n+}\n+\n+#define CMP_ATTR(term_exp, term, attr, flag)\t\t\t\t\\\n+({\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\\\n+\tflag += cmp_attr((term_exp).attr, (term).attr, #attr);\t\\\n+\tflag; \\\n+})\n+\n+#define CMP_C_CC(term_exp, term, flag)\t\t\t\t\t\t\t\t\\\n+({\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\\\n+\tflag += cmp_c_cc(term_exp.c_cc, term.c_cc, sizeof(term.c_cc));\t\\\n+\tflag;\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\\\n+})\n+\n+static void chk_tty_parms_termio(void)\n+{\n+\tint flag = 0;\n+\n+\tflag = CMP_ATTR(termio_exp, termio, c_line, flag);\n+\tflag = CMP_C_CC(termio_exp, termio, flag);\n+\tflag = CMP_ATTR(termio_exp, termio, c_lflag, flag);\n+\tflag = CMP_ATTR(termio_exp, termio, c_iflag, flag);\n+\tflag = CMP_ATTR(termio_exp, termio, c_oflag, flag);\n+\n+\tif (!flag)\n+\t\ttst_res(TPASS, \"TCGETA/TCSETA tests\");\n+}\n+\n+static void chk_tty_parms_termios(void)\n+{\n+\tint flag = 0;\n+\n+\tflag = CMP_ATTR(termios_exp, termios, c_line, flag);\n+\tflag = CMP_C_CC(termios_exp, termios, flag);\n+\tflag = CMP_ATTR(termios_exp, termios, c_lflag, flag);\n+\tflag = CMP_ATTR(termios_exp, termios, c_iflag, flag);\n+\tflag = CMP_ATTR(termios_exp, termios, c_oflag, flag);\n+\n+\tif (!flag)\n+\t\ttst_res(TPASS, \"TCGETS/TCSETS tests\");\n+}\n+\n+static void do_child(void)\n+{\n+\tint cfd = SAFE_OPEN(childtty, O_RDWR, 0777);\n+\n+\tSAFE_IOCTL(cfd, TCFLSH, TCIOFLUSH);\n+\n+\t/* tell the parent that we're done */\n+\tTST_CHECKPOINT_WAKE(0);\n+\n+\tTST_CHECKPOINT_WAIT(0);\n+\ttst_res(TINFO, \"child: parent has finished testing\");\n+\tSAFE_CLOSE(cfd);\n+}\n+\n+static void setup(void)\n+{\n+\tint fd;\n+\n+\tif (device) {\n+\t\t/* Single device mode - validate the specified device */\n+\t\ttst_res(TINFO, \"Using specified device: %s\", device);\n+\n+\t\tfd = SAFE_OPEN(device, O_RDWR, 0777);\n+\t\tSAFE_IOCTL(fd, TCGETS, &termios_bak);\n+\t\tSAFE_CLOSE(fd);\n+\t} else {\n+\t\t/* Auto-discovery mode - will find devices during test */\n+\t\ttst_res(TINFO, \"Auto-discovery mode enabled\");\n+\t}\n+\n+\tprepare_termio();\n+}\n+\n+static void cleanup(void)\n+{\n+\tif (parentfd >= 0) {\n+\t\tSAFE_IOCTL(parentfd, TCSETS, &termios_bak);\n+\t\tSAFE_CLOSE(parentfd);\n+\t}\n+\n+\t/* Free any allocated TTY list */\n+\tfree_tty_list();\n+}\n+\n+static struct tst_test test = {\n+\t.timeout = 20,\n+\t.needs_root = 1,\n+\t.needs_checkpoints = 1,\n+\t.forks_child = 1,\n+\t.setup = setup,\n+\t.cleanup = cleanup,\n+\t.test_all = verify_ioctl,\n+\t.test_variants = 2,\n+\t.options = (struct tst_option[]) {\n+\t\t{\"d:\", &device, \"TTY device to test (optional). If not specified, auto-discovers all /dev/tty[0-9]* devices. Example: /dev/tty1\"},\n+\t\t{}\n+\t}\n+};\n+\n","prefixes":[]}