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tests: posix: add POSIX_DEVICE_IO testsuite
Add a testsuite for the POSIX_DEVICE_IO Option Group. Signed-off-by: Chris Friedt <[email protected]> Co-authored-by: Jakub Klimczak <[email protected]> Signed-off-by: Jakub Klimczak <[email protected]>
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‎tests/posix/device_io/CMakeLists.txt‎

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# SPDX-License-Identifier: Apache-2.0
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cmake_minimum_required(VERSION 3.20.0)
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find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
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project(posix_c_lib_ext)
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FILE(GLOB app_sources src/*.c)
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target_sources(app PRIVATE ${app_sources})
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target_include_directories(app PRIVATE ${ZEPHYR_BASE}/lib/posix/options/getopt)
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target_compile_options(app PRIVATE -U_POSIX_C_SOURCE -D_POSIX_C_SOURCE=200809L)

‎tests/posix/device_io/prj.conf‎

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CONFIG_POSIX_API=y
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CONFIG_ZTEST=y
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CONFIG_POSIX_AEP_CHOICE_BASE=y
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CONFIG_POSIX_DEVICE_IO=y
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CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
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CONFIG_ZTEST_STACK_SIZE=2048

‎tests/posix/device_io/src/main.c‎

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/*
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* Copyright (c) 2025 Tenstorrent AI ULC
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdio.h>
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#include <zephyr/ztest.h>
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#include <zephyr/posix/fcntl.h>
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#include <zephyr/posix/poll.h>
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#include <zephyr/posix/sys/select.h>
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#include <zephyr/posix/unistd.h>
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#ifndef STDIN_FILENO
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#define STDIN_FILENO 0
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#endif
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#ifndef STDOUT_FILENO
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#define STDOUT_FILENO 1
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#endif
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#ifndef STDERR_FILENO
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#define STDERR_FILENO 2
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#endif
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ZTEST(posix_device_io, test_FD_CLR)
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{
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fd_set fds;
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FD_CLR(0, &fds);
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}
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ZTEST(posix_device_io, test_FD_ISSET)
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{
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fd_set fds;
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zassert_false(FD_ISSET(0, &fds));
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}
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ZTEST(posix_device_io, test_FD_SET)
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{
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fd_set fds;
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FD_SET(0, &fds);
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zassert_true(FD_ISSET(0, &fds));
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}
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ZTEST(posix_device_io, test_FD_ZERO)
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{
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fd_set fds;
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FD_ZERO(&fds);
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zassert_false(FD_ISSET(0, &fds));
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}
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ZTEST(posix_device_io, test_close)
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{
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zassert_not_ok(close(-1));
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}
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ZTEST(posix_device_io, test_fdopen)
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{
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zassert_not_null(fdopen(1, "r"));
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}
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ZTEST(posix_device_io, test_fileno)
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{
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#define DECL_TDATA(_stream, _fd) \
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{ \
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.stream_name = #_stream, \
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.stream = _stream, \
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.fd_name = #_fd, \
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.fd = _fd, \
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}
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const struct fileno_test_data {
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const char *stream_name;
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FILE *stream;
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const char *fd_name;
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int fd;
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} test_data[] = {
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DECL_TDATA(stdin, STDIN_FILENO),
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DECL_TDATA(stdout, STDOUT_FILENO),
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DECL_TDATA(stderr, STDERR_FILENO),
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};
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ARRAY_FOR_EACH(test_data, i) {
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FILE *stream = test_data[i].stream;
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int expect_fd = test_data[i].fd;
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int actual_fd = fileno(stream);
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if ((i == STDERR_FILENO) &&
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(IS_ENABLED(CONFIG_PICOLIBC) || IS_ENABLED(CONFIG_NEWLIB_LIBC))) {
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TC_PRINT("Note: stderr not enabled\n");
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continue;
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}
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zexpect_equal(actual_fd, expect_fd, "fileno(%s) (%d) != %s (%d)",
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test_data[i].stream_name, actual_fd, test_data[i].fd_name, expect_fd);
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}
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}
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ZTEST(posix_device_io, test_open)
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{
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/*
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* Note: open() is already exercised extensively in tests/posix/fs, but we should test it
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* here on device nodes as well.
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*/
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zexpect_equal(open("/dev/null", O_RDONLY), -1);
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zexpect_equal(errno, ENOENT);
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}
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ZTEST(posix_device_io, test_poll)
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{
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struct pollfd fds[1] = {{.fd = STDIN_FILENO, .events = POLLIN}};
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/*
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* Note: poll() is already exercised extensively in tests/posix/eventfd, but we should test
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* it here on device nodes as well.
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*/
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zexpect_equal(poll(fds, ARRAY_SIZE(fds), 0), 1);
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}
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ZTEST(posix_device_io, test_pread)
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{
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uint8_t buf[8];
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zexpect_equal(pread(STDIN_FILENO, buf, sizeof(buf), 0), -1);
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zexpect_equal(errno, ENOTSUP);
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}
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ZTEST(posix_device_io, test_pselect)
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{
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fd_set fds;
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struct timespec timeout = {.tv_sec = 0, .tv_nsec = 0};
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FD_ZERO(&fds);
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FD_SET(STDIN_FILENO, &fds);
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/* Zephyr does not yet support select or poll on stdin */
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zexpect_equal(pselect(STDIN_FILENO + 1, &fds, NULL, NULL, &timeout, NULL), -1);
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zexpect_equal(errno, EBADF);
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}
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ZTEST(posix_device_io, test_pwrite)
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{
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/* Zephyr does not yet support writing through a file descriptor */
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zexpect_equal(pwrite(STDOUT_FILENO, "x", 1, 0), -1);
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zexpect_equal(errno, ENOTSUP, "%d", errno);
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}
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ZTEST(posix_device_io, test_read)
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{
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uint8_t buf[8];
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/* reading from stdin does not work in Zephyr */
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zassert_equal(read(STDIN_FILENO, buf, sizeof(buf)), 0);
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}
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ZTEST(posix_device_io, test_select)
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{
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fd_set fds;
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struct timeval timeout = {.tv_sec = 0, .tv_usec = 0};
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FD_ZERO(&fds);
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FD_SET(STDIN_FILENO, &fds);
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/* Zephyr does not yet support select or poll on stdin */
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zassert_equal(select(STDIN_FILENO + 1, &fds, NULL, NULL, &timeout), -1);
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zexpect_equal(errno, EBADF, "%d", errno);
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}
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ZTEST(posix_device_io, test_write)
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{
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/* write is only implemented in newlib and arcmwdt */
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#if defined(CONFIG_NEWLIB_LIBC) || defined(CONFIG_ARCMWDT_LIBC)
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zexpect_equal(write(STDOUT_FILENO, "x", 1), 1);
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#else
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zexpect_equal(write(STDOUT_FILENO, "x", 1), 0);
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#endif
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}
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ZTEST_SUITE(posix_device_io, NULL, NULL, NULL, NULL, NULL);

‎tests/posix/device_io/testcase.yaml‎

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common:
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filter: not CONFIG_NATIVE_LIBC
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tags:
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- posix
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- device_io
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# 1 tier0 platform per supported architecture
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platform_key:
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- arch
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- simulation
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min_ram: 32
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tests:
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portability.posix.device_io:
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extra_configs:
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- CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=256
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portability.posix.device_io.armclang_std_libc:
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toolchain_allow: armclang
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extra_configs:
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- CONFIG_ARMCLANG_STD_LIBC=y
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portability.posix.device_io.arcmwdtlib:
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toolchain_allow: arcmwdt
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extra_configs:
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- CONFIG_ARCMWDT_LIBC=y
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portability.posix.device_io.minimal:
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extra_configs:
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- CONFIG_MINIMAL_LIBC=y
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- CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=256
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portability.posix.device_io.newlib:
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filter: TOOLCHAIN_HAS_NEWLIB == 1
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extra_configs:
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- CONFIG_NEWLIB_LIBC=y
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portability.posix.device_io.picolibc:
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tags: picolibc
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filter: CONFIG_PICOLIBC_SUPPORTED
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extra_configs:
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- CONFIG_PICOLIBC=y

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