Re: [PATCH v4 03/16] index-helper: new daemon for caching index and related stuff

> diff --git a/git-compat-util.h b/git-compat-util.h
> index c07e0c1..8b878fe 100644
> --- a/git-compat-util.h
> +++ b/git-compat-util.h
> @@ -513,6 +513,7 @@ static inline int ends_with(const char *str, const char *suffix)
>  #define PROT_READ 1
>  #define PROT_WRITE 2
>  #define MAP_PRIVATE 1
> +#define MAP_SHARED 2
>  #endif
>  
>  #define mmap git_mmap
> @@ -1045,4 +1046,21 @@ struct tm *git_gmtime_r(const time_t *, struct tm *);
>  #define getc_unlocked(fh) getc(fh)
>  #endif
>  
> +#ifdef __linux__
> +#define UNIX_PATH_MAX 108
> +#elif defined(__APPLE__) || defined(BSD)
> +#define UNIX_PATH_MAX 104
> +#else
> +/*
> + * Quoth POSIX: The size of sun_path has intentionally been left
> + * undefined. This is because different implementations use different
> + * sizes. For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a
> + * size of 104. Since most implementations originate from BSD
> + * versions, the size is typically in the range 92 to 108.
> + *
> + * Thanks, POSIX!  Super-helpful!  Hope we don't overflow any buffers!
> + */
> +#define UNIX_PATH_MAX 92
> +#endif
> +