linux-next.git/tools/include/nolibc, branch master

tools/nolibc: validate directory with O_DIRECTORY in opendir()

2026-08-31T20:51:17+00:00

fdopendir() requires a call to fstat() to determine if the opened file is a directory. Currently opendir() inherits this extra syscall. Switch to O_DIRECTORY and remove the call to fdopendir() in opendir() to make the directory type check cheaper. Signed-off-by: Thomas Weißschuh Reviewed-by: Willy Tarreau Link: https://patch.msgid.link/20260831-nolibc-fdopendir-enotdir-v1-3-8cf0e79c4e6f@weissschuh.net

tools/nolibc: verify that a directory is opened

2026-08-31T20:51:06+00:00

If a non-directory is opened, ENODIR should be returned from opendir()/fdopendir() right away and not only during readdir_r(). Validate the type of opened file during open. Signed-off-by: Thomas Weißschuh Reviewed-by: Willy Tarreau Link: https://patch.msgid.link/20260831-nolibc-fdopendir-enotdir-v1-1-8cf0e79c4e6f@weissschuh.net

tools/nolibc: Add sendfile()

2026-08-31T04:19:24+00:00

This is useful because it allows copying data up to 2GB from one fd to another without a buffer in userspace and with a single syscall. For 32bit kernels we use the sendfile64 syscall to allow for 64bit offsets to work. Signed-off-by: Daniel Palmer Link: https://patch.msgid.link/20260828103205.384589-2-daniel@thingy.jp Signed-off-by: Thomas Weißschuh

tools/nolibc: add support for hexagon

2026-08-31T04:19:17+00:00

A mostly straightforward new architecture with a few quirks: * Only qemu-user is supported for testing. * Clang is required for compilation. * -fsanitize=undefined is broken. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Reviewed-by: Brian Cain Link: https://patch.msgid.link/20260819-nolibc-hexagon-v1-3-6bc3be591f09@weissschuh.net

tools/nolibc: split the architecture list into multiple lines

2026-08-31T04:19:16+00:00

The list is getting long, split it up for easier additions. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Reviewed-by: Brian Cain Link: https://patch.msgid.link/20260819-nolibc-hexagon-v1-1-6bc3be591f09@weissschuh.net

tools/nolibc: add support for Alpha

2026-08-02T07:30:55+00:00

A straightforward new architecture. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Tested-by: Michael Cree Link: https://patch.msgid.link/20260722-nolibc-alpha-v2-1-4970e48eb7bf@weissschuh.net

tools/nolibc/powerpc: mark ctr and xer as clobbered by system call

2026-07-30T10:44:07+00:00

The system call can clobber the ctr and xer registers. Make sure the compiler takes this into account. The missing clobbers only seem to be an issue with newer compilers. Fixes: 0cb0675ec37e ("tools/nolibc: add support for powerpc") Signed-off-by: Thomas Weißschuh Link: https://patch.msgid.link/20260727-nolibc-powerpc-clobber-v1-1-e0911cc99ce1@linutronix.de Signed-off-by: Thomas Weißschuh

tools/nolibc: remove dead __ARCH_WANT_SYS_OLD_SELECT

2026-07-26T19:51:33+00:00

The macro lost its last user when select() was reimplemented on top of pselect6 for every architecture; sys/select.h no longer looks at it, and nothing else in the tree does either. See commit 668e43737279 ("tools/nolibc/select: drop non-pselect based implementations"). The comment that goes with it is stale for the same reason, as neither architecture can end up calling old_select any more. Drop both from arch-x86.h and arch-arm.h. Cc: Alviro Iskandar Setiawan Signed-off-by: Ammar Faizi Signed-off-by: Thomas Weißschuh

tools/nolibc: mark arg1 operand in __nolibc_syscall0() as write-only

2026-07-03T18:00:09+00:00

__nolibc_syscall0() does not set the arg1 variable before passing it to the asm block. This uninitialized variable read is undefined behavior. Clang can miscompile this. Mark the asm operand as write-only to fix this. Fixes: 8e1930296f92 ("tools/nolibc: Add support for SPARC") Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260703-nolibc-sparc-asm-v1-1-c7fe73e2e777@weissschuh.net

tools/nolibc: unistd: Add readlink()

2026-07-03T06:07:59+00:00

Add readlink(). This is needed to test getcwd(). Signed-off-by: Daniel Palmer Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260702085101.3304547-3-daniel@thingy.jp Signed-off-by: Thomas Weißschuh