mailing list of musl libc

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 #include <ftw.h>

int ftw(const char *path, int (*fn)(const char *, const struct stat *, int), int fd_limit)
{
	/* The following cast assumes that calling a function with one
	 * argument more than it needs behaves as expected. This is
	 * actually undefined, but works on all real-world machines. */
	return nftw(path, (int (*)(const char *, const struct stat *, int, struct FTW *))fn, fd_limit, FTW_PHYS);
}