kernel/linux.git/tools/testing/selftests/nolibc, branch linux-7.0.y

selftests/nolibc: Fix build with host headers and libc

2026-05-23T11:08:32+00:00

[ Upstream commit 27532c645e61da541173d43fbe03d234f68232f9 ] Many systems don't have strlcpy() or strlcat() and readdir_r() is deprecated. This makes the tests fail to build with the host headers. Disable the 'directories' test and define strlcpy(), strlcat() and readdir_r() using #defines so that the code compiles. Fixes: 6fe8360b16acb ("selftests/nolibc: also test libc-test through regular selftest framework") Signed-off-by: David Laight Link: https://patch.msgid.link/20260223101735.2922-4-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh Signed-off-by: Sasha Levin

selftests/nolibc: fix test_file_stream() on musl libc

2026-05-23T11:08:32+00:00

[ Upstream commit 8ba600aa577f73cc551747fdf121afc7d04afcea ] fwrite() modifying errno is non-standard. Only validate this behavior on those libc implementations which implement it. Fixes: a5f00be9b3b0 ("tools/nolibc: Add a simple test for writing to a FILE and reading it back") Signed-off-by: Thomas Weißschuh Signed-off-by: Sasha Levin

tools/nolibc: Add a simple test for writing to a FILE and reading it back

2026-01-11T11:47:47+00:00

Add a test that exercises create->write->seek->read to check that using the stream functions (fwrite() etc) is not totally broken. The only edge cases this is testing for are: - Reading the file after writing but without rewinding reads nothing. - Trying to read more items than the file contains returns the count of fully read items. Signed-off-by: Daniel Palmer Link: https://patch.msgid.link/20260105023629.1502801-4-daniel@thingy.jp Signed-off-by: Thomas Weißschuh

selftests/nolibc: also test libc-test through regular selftest framework

2026-01-11T10:17:15+00:00

Hook up libc-test to the regular selftest build to make sure nolibc-test.c stays compatible with a normal libc. As the pattern rule from lib.mk does not handle compiling a target from a differently named source file, add an explicit rule definition. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260106-nolibc-selftests-v1-3-f82101c2c505@weissschuh.net

selftests/nolibc: scope custom flags to the nolibc-test target

2026-01-11T10:17:12+00:00

A new target for 'libc-test' is going to be added which should not be affected by these options. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260106-nolibc-selftests-v1-2-f82101c2c505@weissschuh.net

selftests/nolibc: try to read from stdin in readv_zero test

2026-01-11T10:17:07+00:00

When stdout is redirected to a file this test fails. This happens when running through the kselftest runner since commit d9e6269e3303 ("selftests/run_kselftest.sh: exit with error if tests fail"). For consistency with other tests that read from a file descriptor, switch to stdin over stdout. The tests are still brittle against a redirected stdin, but at least they are now consistently so. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260106-nolibc-selftests-v1-1-f82101c2c505@weissschuh.net

selftests/nolibc: always build sparc32 tests with -mcpu=v8

2026-01-06T11:30:16+00:00

Since LLVM commit 39e30508a7f6 ("[Driver][Sparc] Default to -mcpu=v9 for 32-bit Linux/sparc64 (#109278)"), clang defaults to -mcpu=v9 for 32-bit SPARC builds. -mcpu=v9 generates instructions which are not recognized by qemu-sparc and qemu-system-sparc. Explicitly enforce -mcpu=v8 to generate compatible code. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260106-nolibc-sparc32-fix-v2-1-7c5cd6b175c2@weissschuh.net

selftests/nolibc: drop NOLIBC_SYSROOT=0 logic

2026-01-06T11:08:09+00:00

This logic was added in commit 850fad7de827 ("selftests/nolibc: allow test -include /path/to/nolibc.h") to allow the testing of -include /path/to/nolibc.h. As it requires as special variable to activate, this code is nearly never used. Furthermore it complicates the logic a bit. Since commit a6a054c8ad32 ("tools/nolibc: add target to check header usability") and commit 443c6467fcd6 ("selftests/nolibc: always run nolibc header check") the usability of -include /path/to/nolibc.h is always checked anyways, making NOLIBC_SYSROOT=0 pointless. Drop the special logic. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260104-nolibc-nolibc_sysroot-v1-1-98025ad99add@weissschuh.net

selftests/nolibc: test compatibility of nolibc and kernel time types

2026-01-06T11:08:04+00:00

Keeping 'struct timespec' and 'struct __kernel_timespec' compatible allows the source code to stay simple. Validate that the types stay compatible. The test is specific to nolibc and does not compile on other libcs, so skip it there. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Reviewed-by: Arnd Bergmann Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-10-c662992f75d7@weissschuh.net

tools/nolibc: add ptrace support

2026-01-04T09:28:44+00:00

Add ptrace support, as it will be useful in UML. Signed-off-by: Benjamin Berg [Thomas: drop va_args usage and linux/uio.h inclusion] Signed-off-by: Thomas Weißschuh