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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 <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-14-c662992f75d7@weissschuh.net
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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 <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-11-c662992f75d7@weissschuh.net
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timeval::tv_usec is going to be 64-bit wide even on 32-bit
architectures. As not all architectures support 64-bit multiplications
instructions, calls to libgcc (__multi3()) may be emitted by the
compiler which are not provided by nolibc.
As tv_usec and tv_nsec are guaranteed to always fit into an uint32_t,
perform a 32-bit multiplication instead.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-7-c662992f75d7@weissschuh.net
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timespec::tv_nsec is going to be 64-bit wide even on 32-bit
architectures. As not all architectures support 64-bit division
instructions, calls to libgcc (__divdi3()) may be emitted by the
compiler which are not provided by nolibc.
As tv_nsec is guaranteed to always fit into an uint32_t, perform a
32-bit division instead.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-6-c662992f75d7@weissschuh.net
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Make sure to always use the 64-bit safe system calls
in preparation for 64-bit time_t on 32-bit architectures.
Also prevent issues on kernels which disable CONFIG_COMPAT_32BIT_TIME
and therefore don't provide the 32-bit system calls anymore.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-5-c662992f75d7@weissschuh.net
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This invocation uses libc types with a system call. While this works
now, upcoming changes to 'struct timeval' would require type
conversions. If types are converted anyways, the clock_gettime() based
fallback can be used everywhere, simplifying the code.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-4-c662992f75d7@weissschuh.net
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These implementations use the libc 'struct timeval' with system calls
which can lead to type mismatches. Currently this is fine, but will
break with upcoming changes to 'struct timeval'.
If the structure needs to be converted anyways, the implementations
based on pselect can be used for all architectures. This simplifies the
logic.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-3-c662992f75d7@weissschuh.net
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The system calls expect 'struct __kernel_old_timespec'.
While currently 'struct __kernel_old_timespec' and 'struct timespec' are
compatible, this is confusing. Especially as future patches will change
the definition of 'struct timespec'.
Use the correct kernel type instead.
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/lkml/fbca1d3e-12e4-4c4e-8091-87464035fe39@app.fastmail.com/
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20251220-nolibc-uapi-types-v3-1-c662992f75d7@weissschuh.net
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Add ptrace support, as it will be useful in UML.
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
[Thomas: drop va_args usage and linux/uio.h inclusion]
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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While an integer zero is a valid NULL pointer as per the C standard,
sparse will complain about it.
Use explicit NULL pointers instead.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/r/202509261452.g5peaXCc-lkp@intel.com/
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
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Modern programs tend to include sys/select.h to get FD_SET() and
FD_CLR() definitions as well as struct fd_set, but in our case it
didn't exist.
The definitions were moved from types.h to sys/select.h, which is
now included from nolibc.h, and the sys_select() definition moved
there as well from sys.h.
Signed-off-by: Willy Tarreau <w@1wt.eu>
[Thomas: adapt to current -next branch]
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is generally useful and struct iovec is also needed for other
purposes such as ptrace.
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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In principle, it is possible to use nolibc for only some object files in
a program. In that case, the startup code in _start and _start_c is not
going to be used. Add the NOLIBC_NO_RUNTIME compile time option to
disable it entirely and also remove anything that depends on it.
Doing this avoids warnings from modpost for UML as the _start_c code
references the main function from the .init.text section while it is not
inside .init itself.
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Since commit fb01ff635efd ("tools/nolibc: keep brk(), sbrk(), mmap()
away from __sysret()") the implementation of mmap() does not use the
__sysret() macro anymore.
Remove the outdated comment.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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wstatus is allowed to be NULL. Avoid a segmentation fault in this case.
Fixes: 0c89abf5ab3f ("tools/nolibc: implement waitpid() in terms of waitid()")
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Not all architectures implement the wait4() syscall. It can be
implemented in terms of the waitid() syscall, but that would require
some rework of the other wait-related functions in wait.h.
As wait4() is non-standard and deprecated, remove it.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250821-nolibc-enosys-v1-7-4b63f2caaa89@weissschuh.net
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These fallbacks where added when no explicit fallbacks for time64 was
implemented. Now that these fallbacks are in place, the additional
fallback to __nolibc_enosys() is superfluous.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250821-nolibc-enosys-v1-1-4b63f2caaa89@weissschuh.net
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Some lines are using spaces for indentation instead of the standard tabs.
Fix them.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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The compiler does not know that waitid() will only ever return 0 or -1.
If waitid() would return a positive value than waitpid() would return that
same value and *status would not be initialized.
However users calling waitpid() know that the only possible return values
of it are 0 or -1. They therefore might check for errors with
'ret == -1' or 'ret < 0' and use *status otherwise. The compiler will then
warn about the usage of a potentially uninitialized variable.
Example:
$ cat test.c
#include <stdio.h>
#include <unistd.h>
int main(void)
{
int ret, status;
ret = waitpid(0, &status, 0);
if (ret == -1)
return 0;
printf("status %x\n", status);
return 0;
}
$ gcc --version
gcc (GCC) 15.1.1 20250425
$ gcc -Wall -Os -Werror -nostdlib -nostdinc -static -Iusr/include -Itools/include/nolibc/ -o /dev/null test.c
test.c: In function ‘main’:
test.c:12:9: error: ‘status’ may be used uninitialized [-Werror=maybe-uninitialized]
12 | printf("status %x\n", status);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test.c:6:18: note: ‘status’ was declared here
6 | int ret, status;
| ^~~~~~
cc1: all warnings being treated as errors
Avoid the warning by normalizing waitid() errors to '-1' in waitpid().
Fixes: 0c89abf5ab3f ("tools/nolibc: implement waitpid() in terms of waitid()")
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250707-nolibc-waitpid-uninitialized-v1-1-dcd4e70bcd8f@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is the location regular userspace expects these definitions.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-7-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects these definitions.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-6-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects these definitions.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-5-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects this definition.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-4-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects this definition.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-3-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects this definition.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-2-74f82eea3b59@weissschuh.net
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This is the location regular userspace expects this definition.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-1-74f82eea3b59@weissschuh.net
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Newer architectures like riscv 32-bit are missing sys_wait4().
Make use of the fact that wait(&status) is defined to be equivalent to
waitpid(-1, status, 0) to implement it on all architectures.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-15-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Newer architectures (like riscv32) do not implement sys_gettimeofday().
In those cases fall back to sys_clock_gettime().
While that does not support the timezone argument of sys_gettimeofday(),
specifying this argument invokes undefined behaviour, so it's safe to ignore.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-14-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-10-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-5-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is used in various selftests and will be handy when integrating
those with nolibc.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-4-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Add fstat(), fstatat() and lstat(). All of them use the existing implementation
based on statx().
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-3-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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Inclusion of any nolibc header file should also bring all other headers.
On the other hand it should also be possible to include any nolibc header
files
in any order.
Currently this is implemented by including the catch-all nolibc.h after the
headers own definitions.
This is problematic if one nolibc header depends on another one.
The first header has to include the other one before defining any symbols.
That in turn will include the rest of nolibc while the current header has
not defined anything yet. If any other part of nolibc depends on
definitions from the current header, errors are encountered.
This is already the case today. Effectively nolibc can only be included in
the order of nolibc.h.
Restructure the way "nolibc.h" is included.
Move it to the beginning of the header files and before the include guards.
Now any header will behave exactly like "nolibc.h" while the include
guards prevent any duplicate definitions.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250424-nolibc-header-check-v1-2-011576b6ed6f@linutronix.de
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The old wait4() syscall used by waitpid() before is not available everywhere.
Switch to the waitid() syscall which is the new replacement.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
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This is the location regular userspace expects these definitions.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-10-a069a3f1d145@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is the location regular userspace expects the header.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-9-a069a3f1d145@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is the location regular userspace expects this definition.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-8-a069a3f1d145@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is the location regular userspace expects the definition.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-7-a069a3f1d145@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is the location regular userspace expects these definitions.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-6-a069a3f1d145@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is the location regular userspace expects these definitions.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-5-a069a3f1d145@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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This is the location regular userspace expects the definition.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-4-a069a3f1d145@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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