Re: [PATCH 1/3] tools/nolibc: unistd: Add getcwd()

[Thomas Weißschuh]

May 2, 2026 09:25:43 Daniel Palmer <daniel@xxxxxxxxx>:

> Add getcwd() for getting the current working directory.
>
> Signed-off-by: Daniel Palmer <daniel@xxxxxxxxx>
> ---
> tools/include/nolibc/unistd.h | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/tools/include/nolibc/unistd.h b/tools/include/nolibc/unistd.h
> index 5882a6862066..c7f89c56bc9b 100644
> --- a/tools/include/nolibc/unistd.h
> +++ b/tools/include/nolibc/unistd.h
> @@ -48,6 +48,28 @@ int access(const char *path, int amode)
>     return faccessat(AT_FDCWD, path, amode, 0);
> }
>
> +/*
> + * char *getcwd(char *buf, size_t size);
> + */
> +
> +static __attribute__((unused))
> +int _sys_getcwd(char *buf, size_t size)
> +{
> +   return __nolibc_syscall2(__NR_getcwd, buf, size);
> +}
> +
> +static __attribute__((unused))
> +char *getcwd(char *buf, size_t size)
> +{
> +   /* If successful we get the number of bytes written into
> +    * the buffer, so check the result is positive.
> +    */
> +   if (__sysret(_sys_getcwd(buf, size)) > 0)

According to the comment before the system call implementation this should be '>= 0'.

> +       return buf;
> +
> +   /* On error return NULL, __sysret() above will have set errno */
> +   return NULL;
> +}
>
> static __attribute__((unused))
> int msleep(unsigned int msecs)
> --
> 2.53.0