[musl] [PATCH v2 1/2] nftw: implement FTW_CHDIR

[Ismael Luceno <ismael@iodev.co.uk>]

Signed-off-by: Ismael Luceno <ismael@iodev.co.uk>
---
 src/misc/nftw.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/misc/nftw.c b/src/misc/nftw.c
index 8dcff7fefd2a..0a35686e663d 100644
--- a/src/misc/nftw.c
+++ b/src/misc/nftw.c
@@ -87,6 +87,8 @@ static int do_nftw(char *path, int (*fn)(const char *, const struct stat *, int,
 		DIR *d = fdopendir(dfd);
 		if (d) {
 			struct dirent *de;
+			if (flags & FTW_CHDIR)
+				fchdir(dfd);
 			while ((de = readdir(d))) {
 				if (de->d_name[0] == '.'
 				 && (!de->d_name[1]
@@ -123,6 +125,7 @@ int nftw(const char *path, int (*fn)(const char *, const struct stat *, int, str
 	int r, cs;
 	size_t l;
 	char pathbuf[PATH_MAX+1];
+	int orig_dfd;
 
 	if (fd_limit <= 0) return 0;
 
@@ -133,9 +136,16 @@ int nftw(const char *path, int (*fn)(const char *, const struct stat *, int, str
 	}
 	memcpy(pathbuf, path, l+1);
 	
+	if (flags & FTW_CHDIR)
+		orig_dfd = open(".", O_CLOEXEC | O_PATH);
+
 	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
 	r = do_nftw(pathbuf, fn, fd_limit, flags, NULL);
 	pthread_setcancelstate(cs, 0);
+	if (flags & FTW_CHDIR) {
+		fchdir(orig_dfd);
+		close(orig_dfd);
+	}
 	return r;
 }
 
-- 
2.33.0