kernel/linux.git/tools/include/nolibc/sys, branch master

tools/nolibc: add the _syscall() macro

2026-04-07T07:27:07+00:00

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 Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260405-nolibc-syscall-v1-3-e5b12bc63211@weissschuh.net

tools/nolibc: move the call to __sysret() into syscall()

2026-04-07T07:27:02+00:00

__sysret() transforms the return value from the kernel into the libc return value convention. There is no reason for it to be called in the middle of the internals of the syscall() implementation macros. Move the call up, directly into syscall(), to make the code simpler. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260405-nolibc-syscall-v1-2-e5b12bc63211@weissschuh.net

tools/nolibc: rename the internal macros used in syscall()

2026-04-07T07:26:57+00:00

These macros are the internal implementation of syscall(). They can not be used by users. Align them with the standard naming scheme for internal symbols. The current name also prevents the addition of an application-usable _syscall() symbol. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260405-nolibc-syscall-v1-1-e5b12bc63211@weissschuh.net

tools/nolibc: use makedev() in fstatat()

2026-04-04T08:29:07+00:00

fstatat() contains two open-coded copies of makedev() to handle minor numbers >= 256. Now that the regular makedev() handles both large minor and major numbers correctly use the common function. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-6-456a429bf60c@weissschuh.net

tools/nolibc: handle all major and minor numbers in makedev() and friends

2026-04-04T08:29:02+00:00

Remove the limitation of only handling small major and minor numbers. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-5-456a429bf60c@weissschuh.net

tools/nolibc: move the logic of makedev() and friends into functions

2026-04-04T08:28:50+00:00

Functions make it easier to keep the input and output types straight and avoid duplicate evaluations of their arguments. Also these functions will become a bit more complex to handle full 64-bit 'dev_t' which is easier to read in a function. Still stay compatible with code which expects these to be macros. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260404-nolibc-makedev-v2-3-456a429bf60c@weissschuh.net

tools/nolibc: rename sys_foo() functions to _sys_foo()

2026-03-22T10:03:59+00:00

The sys_foo() naming scheme used by the syscall wrappers may collide with application symbols. Especially as 'sys_' is an obvious naming scheme an application may choose for its own custom systemcall wrappers. Avoid these conflicts by using an leading underscore which moves the names into the implementation's namespace. This naming scheme was chosen over a '__nolibc_' prefix, as these functions are not an implementation detail but a documented interface meant to be used by applications. While this may break some existing users, adapting them should be straightforward. Given that nolibc is most-likely vendored, no unexpected breakage should happen. No in-tree users are affected. These conflicts happen when compiling some of the kernel selftests with nolibc. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260319-nolibc-namespacing-v1-1-33c22eaddb5e@weissschuh.net

tools/nolibc: rename my_syscallX() to __nolibc_syscallX()

2026-02-25T07:21:17+00:00

The naming convention of the my_syscallX() macros is a bit unfortunate. They may conflict with application code and the name is very generic. Switch to __nolibc_syscallX(). The leading underscores place the symbols in the implementation-defined namespace, avoiding conflicting names. It is also clearer that these are non-standard extensions from nolibc. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260223-nolibc-namespacing-v1-1-52574ffebb2c@weissschuh.net

selftests/nolibc: add static assertions around time types handling

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

The nolibc system call wrappers expect the libc types to be compatible to the kernel types. Make sure these expectations hold at compile-time. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Reviewed-by: Arnd Bergmann Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-14-c662992f75d7@weissschuh.net

tools/nolibc: remove time conversions

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

Now that 'struct timespec' and 'struct __kernel_timespec' are compatible, the conversions are not necessary anymore. The same holds true for 'struct itimerspec' and 'struct __kernel_itimerspec'. Remove the conversions. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Reviewed-by: Arnd Bergmann Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-11-c662992f75d7@weissschuh.net