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2026-05-26selftests/nolibc: test against -Wwrite-stringsThomas Weißschuh
Users may use this warning when building their own applications. Make sure that nolibc does not trigger any such warnings. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260525-nolibc-write-strings-v2-3-ab5cc16c7b23@weissschuh.net
2026-05-26selftests/nolibc: use mutable buffer for execve() argv stringThomas Weißschuh
The existing code would trigger a warning under -Wwrite-strings which is about to be enabled. Use a mutable buffer instead. While in this specific case, casting away the 'const' would be fine, let's avoid casts which are not really necessary. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260525-nolibc-write-strings-v2-2-ab5cc16c7b23@weissschuh.net
2026-05-24tools/nolibc: add ftruncate()Thomas Weißschuh
On architectures with 32-bit longs, call the compat syscall __NR_ftruncate64. As off_t is 64-bit it must be split into 2 registers. Unlike llseek() which passes the high and low parts in explicitly named arguments, the order here is endian independent. Some architectures (arm, mips, ppc) require this pair of registers to be aligned to an even register, so add custom _sys_ftruncate64() wrappers for those. A test case for ftruncate is added which validates negative length or invalid fd return the appropriate error, and checks the length is correct on success. Co-developed-by: Jordan Richards <jordanrichards@google.com> Signed-off-by: Jordan Richards <jordanrichards@google.com> Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Reviewed-by: Daniel Palmer <daniel@thingy.jp> Link: https://patch.msgid.link/20260521-nolibc-ftruncate-v1-3-5384a83b2402@weissschuh.net
2026-05-24selftests/nolibc: enable CONFIG_TMPFS for sparc32Thomas Weißschuh
An upcoming selftest will use memfd_create() which require tmpfs. Enable that. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Reviewed-by: Daniel Palmer <daniel@thingy.jp> Link: https://patch.msgid.link/20260521-nolibc-ftruncate-v1-1-5384a83b2402@weissschuh.net
2026-05-14selftests/nolibc: test open mode handlingThomas Weißschuh
Add a selftest for the new O_TMPFILE open mode handling. While O_CREAT or openat() are not tested, the code is the same, so assume these also work. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260514-nolibc-open-tmpfile-v2-4-b4c6c5efa266@weissschuh.net
2026-05-03tools/nolibc: add support for 32-bit pariscThomas Weißschuh
Extend nolibc to target the 32-bit parisc architecture. 64-bit is not yet supported. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch/msgid.link/20260428-nolibc-hppa-v5-2-d843d573111a@weissschuh.net
2026-05-03selftests/nolibc: avoid function pointer comparisonsThomas Weißschuh
The upcoming parisc support would require libgcc to implement function pointer comparisons. As we try to avoid the libgcc dependency rework the logic to work without such comparisons. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260428-nolibc-hppa-v5-1-d843d573111a@weissschuh.net
2026-05-03tools/nolibc: add support for OpenRISC / or1kThomas Weißschuh
Add support for OpenRISC / or1k to nolibc. _start() uses the same wrapper construct as in arch-sh.h. libgcc is necessary as OpenRISC is missing 64-bit multiplication. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Stafford Horne <shorne@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260429-nolibc-openrisc-v2-1-8d7d7a2f3fec@weissschuh.net
2026-05-03selftests/nolibc: use vmlinux for MIPS testsThomas Weißschuh
QEMU for MIPS can also load 'vmlinux'. Slim down the table by using that from the fallback. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260429-nolibc-qemu-arch-v1-7-a2ca07eab297@weissschuh.net
2026-05-03selftests/nolibc: trim IMAGE mappingsThomas Weißschuh
For many configurations QEMU_ARCH is simply 'vmlinux'. Slim down the table by automatically falling back to 'vmlinux'. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260429-nolibc-qemu-arch-v1-6-a2ca07eab297@weissschuh.net
2026-05-03selftests/nolibc: trim DEFCONFIG mappingsThomas Weißschuh
For many configurations DEFCONFIG is simply 'defconfig'. Slim down the table by automatically falling back to 'defconfig'. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260429-nolibc-qemu-arch-v1-5-a2ca07eab297@weissschuh.net
2026-05-03selftests/nolibc: trim QEMU_ARCH mappingsThomas Weißschuh
For many configurations QEMU_ARCH is the same as XARCH. Slim down the table by automatically falling back to XARCH. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260429-nolibc-qemu-arch-v1-4-a2ca07eab297@weissschuh.net
2026-05-03selftests/nolibc: use QEMU_ARCH for QEMU_ARCH_USERThomas Weißschuh
The current logic forces the XARCH to QEMU_ARCH mapping to contain entries for all architectures. This will change. To avoid duplication of that logic, reuse the already computed QEMU_ARCH variable. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260429-nolibc-qemu-arch-v1-3-a2ca07eab297@weissschuh.net
2026-05-03selftests/nolibc: drop riscv configurationThomas Weißschuh
The riscv configuration is just a duplication of the riscv64 one. Remove it. Passing ARCH=riscv will be rerouted to riscv64 anyways. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260429-nolibc-qemu-arch-v1-2-a2ca07eab297@weissschuh.net
2026-05-03selftests/nolibc: align QEMU_ARCH_mips32beThomas Weißschuh
The variable is slightly misaligned. Fix that. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260429-nolibc-qemu-arch-v1-1-a2ca07eab297@weissschuh.net
2026-04-27selftests/nolibc: test large file supportThomas Weißschuh
Make sure nolibc correctly handles large files. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260418-nolibc-largefile-v1-7-b91f0775bac3@weissschuh.net
2026-04-27selftests/nolibc: drop unnecessary 'mode' argument to open()Thomas Weißschuh
The mode is unnecessary here, drop it. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260419-nolibc-open-mode-v1-1-8dc5a960daa7@weissschuh.net
2026-04-27tools/nolibc: make __nolibc_enosys() a compile time errorThomas Weißschuh
Functions which are known at compile-time to result in ENOSYS can be surprising to the user. For example using old UAPI headers might mean that stat() will always fail although the kernel would have the system call available at runtime. Nowadays __nolibc_enosys() should never be called for normal applications. Switch the silent ENOSYS return into a compile-time error, so the user is aware about the issue. Prefer the 'error' attribute as it provides the best diagnostics. If the users defines NOLIBC_COMPILE_TIME_ENOSYS the old, silent fallback is kept. Also add a test which validates that the error can be optimized away. Reported-by: Willy Tarreau <w@1wt.eu> Closes: https://lore.kernel.org/lkml/acizRIq2xrFUNHNS@1wt.eu/ Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260404-nolibc-enosys-v1-1-e0aba47bdee4@weissschuh.net
2026-04-27tools/nolibc: add alloca()Thomas Weißschuh
Add the wide-used alloca() function. As it is highly machine and compiler dependent, just defer to the compiler builtin. This has been available since GCC 4 and clang 3. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260409-nolibc-alloca-v1-1-ed02f68dfaf9@weissschuh.net
2026-04-09selftests/nolibc: use gcc 15Thomas Weißschuh
Newer compilers tend to detect more problematic code. Update the testsuite to use gcc 15.2.0 by default. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20260408-nolibc-gcc-15-v1-3-330d0c40f894@weissschuh.net
2026-04-07selftests/nolibc: don't skip tests for unimplemented syscalls anymoreThomas Weißschuh
The automatic skipping of tests on ENOSYS returns was introduced in commit 349afc8a52f8 ("selftests/nolibc: skip tests for unimplemented syscalls"). It handled the fact that nolibc would return ENOSYS for many syscall wrappers on riscv32. Nowadays nolibc handles all these correctly, so this logic is not used anymore. To make missing nolibc functionality more obvious fail the tests again if something is not implemented. Revert the mentioned commit again. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260406-nolibc-no-skip-enosys-v1-2-c046b1ac7d73@weissschuh.net/
2026-04-07selftests/nolibc: explicitly handle ENOSYS from ptrace()Thomas Weißschuh
The automatic ENOSYS handling in EXPECT_SYSER() is about to be removed. ptrace() will return legitimately return ENOSYS on qemu-user, so handle it explicitly. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260406-nolibc-no-skip-enosys-v1-1-c046b1ac7d73@weissschuh.net/
2026-04-07tools/nolibc: add byteorder conversionsThomas Weißschuh
Add some standard functions to convert between different byte orders. Conveniently the UAPI headers provide all the necessary functionality. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260405-nolibc-bswap-v1-1-f7699ca9cee0@weissschuh.net
2026-04-07tools/nolibc: add the _syscall() macroThomas Weißschuh
The standard syscall() function or macro uses the libc return value convention. Errors returned from the kernel as negative values are stored in errno and -1 is returned. Users who want to avoid using errno don't have a way to call raw syscalls and check the returned error. Add a new macro _syscall() which works like the standard syscall() but passes through the return value from the kernel unchanged. The naming scheme and return values match the named _sys_foo() system call wrappers already part of nolibc. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260405-nolibc-syscall-v1-3-e5b12bc63211@weissschuh.net
2026-04-06selftests/nolibc: only use libgcc when really necessaryThomas Weißschuh
nolibc should work without libgcc to be compatible with as many toolchains as possible. Currently the functionality tested by nolibc-test does not contain any dependencies, make sure it stays this way by not linking libgcc anymore. On the ppc target GCC always emits references to '_restgpr_' functions, so keep linking libgcc there. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260404-nolibc-libgcc-v1-1-eb3ecfe0e176@weissschuh.net
2026-04-06selftests/nolibc: test the memory allocatorThomas Weißschuh
The memory allocator has not seen any testing so far. Add a simple testcase for it. Suggested-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/lkml/adDRK8D6YBZgv36H@1wt.eu/ Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260404-nolibc-asprintf-v2-2-17d2d0df9763@weissschuh.net
2026-04-06tools/nolibc: add support for asprintf()Thomas Weißschuh
Add support for dynamically allocating formatted strings through asprintf() and vasprintf(). Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260401-nolibc-asprintf-v1-3-46292313439f@weissschuh.net
2026-04-04tools/nolibc: handle all major and minor numbers in makedev() and friendsThomas Weißschuh
Remove the limitation of only handling small major and minor numbers. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-5-456a429bf60c@weissschuh.net
2026-04-04selftests/nolibc: add a test for stat().st_rdevThomas Weißschuh
The handling of 'dev_t' values is about to be changed. Add a test to make sure they are returned correctly from stat(). Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-2-456a429bf60c@weissschuh.net
2026-04-04selftests/nolibc: add some tests for makedev() and friendsThomas Weißschuh
These functions/macros are about to be changed. Add some tests to make sure they continue working. As they only handle small dev_t values, only test those for now. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-1-456a429bf60c@weissschuh.net
2026-04-01tools/nolibc/printf: Support negative variable width and precisionDavid Laight
For (eg) "%*.*s" treat a negative field width as a request to left align the output (the same as the '-' flag), and a negative precision to request the default precision. Set the default precision to -1 (not INT_MAX) and add explicit checks to the string handling for negative values (makes the tet unsigned). For numeric output check for 'precision >= 0' instead of testing _NOLIBC_PF_FLAGS_CONTAIN(flags, '.'). This needs an inverted test, some extra goto and removes an indentation. The changed conditionals fix printf("%0-#o", 0) - but '0' and '-' shouldn't both be specified. Signed-off-by: David Laight <david.laight.linux@gmail.com> Link: https://patch.msgid.link/20260323112247.3196-1-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-22selftests/nolibc: enable -WundefThomas Weißschuh
Users might use -Wundef, so also use it in the nolibc testsuite to ensure no warnings are triggered. The existing line with warning options is getting too long, so move all warnings to a dedicated line. Acked-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20260318-nolibc-wundef-v1-2-fcb7f9ac7298@weissschuh.net
2026-03-22tools/nolibc: add support for program_invocation_{,short_}nameThomas Weißschuh
Add support for the GNU extensions 'program_invocation_name' and 'program_invocation_short_name'. These are useful to print error messages, which by convention include the program name. As these are global variables which take up memory even if not used, similar to 'errno', gate them behind NOLIBC_IGNORE_ERRNO. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260318-nolibc-err-h-v4-1-08247a694bd9@weissschuh.net
2026-03-20selftests/nolibc: validate NOLIBC_IGNORE_ERRNO compilationThomas Weißschuh
When NOLIBC_IGNORE_ERRNO is set, various bits of nolibc are disabled. Make sure that all the ifdeffery does not result in any compilation errors by compiling a dummy source file. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260311-nolibc-err-h-v1-2-735a9de7f15d@weissschuh.net
2026-03-20selftests/nolibc: add a variable for nolibc-test source filesThomas Weißschuh
The list of the nolibc-test source files is repeated many times. Another source file is about to be added, adding to the mess. Introduce a common variable instead. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260311-nolibc-err-h-v1-1-735a9de7f15d@weissschuh.net
2026-03-20selftests/nolibc: Use printf variable field widths and precisionsDavid Laight
Now that printf supports '*' for field widths and precisions then can be used to simplify the test output. - aligning the "[OK]" strings. - reporting the expected sprintf() output when there is a mismatch. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-18-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Add support for octal outputDavid Laight
Octal output isn't often used, but adding it costs very little. Supporting "%#o" is mildly annoying, it has to add a leading '0' if there isn't one present. In simple cases this is the same as adding a sign of '0' - but that adds an extra '0' in a few places. So you need 3 tests, %o, # and no leading '0' (which can only be checked after the zero pad for precision). If all the test are deferred until after zero padding then too many values are 'live' across the call to _nolibc_u64toa_base() and get spilled to stack. Hence the check that ignores the 'sign' if it is the same as the first character of the output string. Add tests for octal output. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-17-david.laight.linux@gmail.com [Thomas: avoid a -Wsign-compare] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Add support for zero padding and field precisionDavid Laight
Includes support for variable field widths (eg "%*.*d"). Zero padding is limited to 31 zero characters. This is wider than the largest numeric field so shouldn't be a problem. All the standard printf formats are now supported except octal and floating point. Add tests for new features Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-16-david.laight.linux@gmail.com [Thomas: fixup testcases for musl libc] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Add support for left aligning fieldsDavid Laight
Output the characters before or after the pad - writing the pad takes more code. Include additional/changed tests Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-15-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Special case 0 and add support for %#xDavid Laight
The output for %#x is almost the same as that for %p, both output in hexadecimal with a leading "0x". However for zero %#x should just output "0" (the same as decimal and ocal). For %p match glibc and output "(nil)" rather than "0x0" or "0". Add tests for "%#x", "% d", "%+d" and passing NULL to "%p". Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-14-david.laight.linux@gmail.com [Thomas: fix up testcases for musl libc] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc/printf: Add support for length modifiers tzqL and formats iXDavid Laight
Length modifiers t (ptrdiff_t) and z (size_t) are aliases for l (long), q and L are 64bit the same as j (intmax). Format i is an alias for d and X similar to x but upper case. Supporting them is mostly just adding the relevant bit to the bit pattern used for matching characters. Although %X is detected the output will be lower case. Change/add tests to use conversions i and X, and length modifiers L and ll. Use the correct minimum value for "%Li". Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-10-david.laight.linux@gmail.com [Thomas: Fix up testcases for musl libc] Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20tools/nolibc: Implement strerror() in terms of strerror_r()David Laight
strerror() can be the only part of a program that has a .data section. This requires 4k in the program file. Add a simple implementation of strerror_r() and use that in strerror() so that the "errno=" string is copied at run-time. Use __builtin_memcpy() because that optimises away the input string and just writes the required constants to the target buffer. Code size change largely depends on whether the inlining decision for strerror() changes. Change the tests to use the normal EXPECT_VFPRINTF() when testing %m. Skip the tests when !is_nolibc. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-4-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20selftests/nolibc: Rename w to written in expect_vfprintf()David Laight
Single character variable names don't make code easy to read. Rename 'w' (used for the return value from snprintf()) 'written'. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260308113742.12649-3-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20selftests/nolibc: Let EXPECT_VFPRINTF() tests be skippedDavid Laight
Tests that check explicit nolibc behavior (eg "%m") or test places where the nolibc behaviour deviates from the libc need skipping when compiled to use the host libc. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260302101815.3043-8-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20selftests/nolibc: Check that snprintf() doesn't write beyond the buffer endDavid Laight
Fill buf[] with known data and check the vsnprintf() doesn't write beyond the specified buffer length. Would have picked up the bug in field padding. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260302101815.3043-7-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20selftests/nolibc: Use length of 'expected' string to check snprintf() outputDavid Laight
Instead of requiring the test cases specifying both the length and expected output, take the length from the expected output. Tests that expect the output be truncated are changed to specify the un-truncated output. Change the strncmp() to a memcmp() with an extra check that the output is actually terminated. Append a '+' to the printed output (after the final ") when the output is truncated. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260302101815.3043-6-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20selftests/nolibc: check vsnprintf() output buffer before the lengthDavid Laight
Check the string matches before checking the returned length. Only print the string once when it matches. Makes it a lot easier to diagnose any incorrect output. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260302101815.3043-5-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20selftests/nolibc: Return correct value when printf test failsDavid Laight
Correctly return 1 (the number of errors) when strcmp() fails rather than the return value from strncmp() which is the signed difference between the mismatching characters. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260302101815.3043-4-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20selftests/nolibc: Fix build with host headers and libcDavid Laight
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 <david.laight.linux@gmail.com> Link: https://patch.msgid.link/20260223101735.2922-4-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2026-03-20selftests/nolibc: fix test_file_stream() on musl libcThomas Weißschuh
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 <linux@weissschuh.net>
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