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Date: Sat, 22 Jan 2022 15:47:03 +0100
From: Ismael Luceno <ismael@...ev.co.uk>
To: musl@...ts.openwall.com
Cc: Rich Felker <dalias@...c.org>
Subject: Re: [PATCH 2/2] nftw: implement FTW_ACTIONRETVAL (GNU
extension)
I noticed a small bug, I'll submit a v2.
On 22/Jan/2022 14:26, Ismael Luceno wrote:
> Signed-off-by: Ismael Luceno <ismael@...ev.co.uk>
> ---
> include/ftw.h | 7 +++++++
> src/misc/nftw.c | 32 ++++++++++++++++++++++----------
> 2 files changed, 29 insertions(+), 10 deletions(-)
>
> diff --git a/include/ftw.h b/include/ftw.h
> index b15c062a8389..2e77dc76e11b 100644
> --- a/include/ftw.h
> +++ b/include/ftw.h
> @@ -21,6 +21,13 @@ extern "C" {
> #define FTW_CHDIR 4
> #define FTW_DEPTH 8
>
> +#define FTW_ACTIONRETVAL 16
> +/* return values for callback */
> +#define FTW_CONTINUE 0
> +#define FTW_STOP 1
> +#define FTW_SKIP_SUBTREE 2
> +#define FTW_SKIP_SIBLINGS 3
> +
> struct FTW {
> int base;
> int level;
> diff --git a/src/misc/nftw.c b/src/misc/nftw.c
> index 0a35686e663d..4b934adcfb0c 100644
> --- a/src/misc/nftw.c
> +++ b/src/misc/nftw.c
> @@ -26,7 +26,7 @@ static int do_nftw(char *path, int (*fn)(const char *, const struct stat *, int,
> struct stat st;
> struct history new;
> int type;
> - int r;
> + int r, r2;
> int dfd;
> int err;
> struct FTW lev;
> @@ -72,12 +72,18 @@ static int do_nftw(char *path, int (*fn)(const char *, const struct stat *, int,
> if (!fd_limit) close(dfd);
> }
>
> - if (!(flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
> - return r;
> + if (!(flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev))) {
> + if ((flags & FTW_ACTIONRETVAL)) {
> + if (r == FTW_SKIP_SUBTREE)
> + return 0;
> + /* FTW_SKIP_SIBLINGS is saved for returning */
> + } else
> + return r;
> + }
>
> for (; h; h = h->chain)
> if (h->dev == st.st_dev && h->ino == st.st_ino)
> - return 0;
> + return r;
>
> if ((type == FTW_D || type == FTW_DP) && fd_limit) {
> if (dfd < 0) {
> @@ -101,9 +107,12 @@ static int do_nftw(char *path, int (*fn)(const char *, const struct stat *, int,
> }
> path[j]='/';
> strcpy(path+j+1, de->d_name);
> - if ((r=do_nftw(path, fn, fd_limit-1, flags, &new))) {
> + if ((r2=do_nftw(path, fn, fd_limit-1, flags, &new))) {
> + if ((flags & FTW_ACTIONRETVAL)
> + && r2 == FTW_SKIP_SIBLINGS)
> + break;
> closedir(d);
> - return r;
> + return r2;
> }
> }
> closedir(d);
> @@ -114,10 +123,13 @@ static int do_nftw(char *path, int (*fn)(const char *, const struct stat *, int,
> }
>
> path[l] = 0;
> - if ((flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
> - return r;
> -
> - return 0;
> + if (flags & FTW_DEPTH) {
> + r = fn(path, &st, type, &lev);
> + /* ignore FTW_SKIP_SUBTREE, the caller is broken */
> + if ((flags & FTW_ACTIONRETVAL) && r == FTW_SKIP_SUBTREE)
> + r = 0;
> + }
> + return r;
> }
>
> int nftw(const char *path, int (*fn)(const char *, const struct stat *, int, struct FTW *), int fd_limit, int flags)
> --
> 2.33.0
>
--
Ismael Luceno
http://iodev.co.uk/
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