diff options
Diffstat (limited to 'sysdeps/unix/opendir.c')
| -rw-r--r-- | sysdeps/unix/opendir.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/sysdeps/unix/opendir.c b/sysdeps/unix/opendir.c index 77f2a0a490..657ad176a8 100644 --- a/sysdeps/unix/opendir.c +++ b/sysdeps/unix/opendir.c @@ -29,6 +29,30 @@ #include <dirstream.h> + +/* We want to be really safe the file we opened is a directory. Some systems + have support for this, others don't. */ +#ifdef O_DIRECTORY +# define OPENDIR(NAME) \ + do { \ + fd = __open (NAME, O_RDONLY|O_NDELAY|O_DIRECTORY); \ + if (fd < 0) \ + return NULL; \ + } while (0) +#else +# define OPENDIR(NAME) \ + do { \ + fd = __open (NAME, O_RDONLY|O_NDELAY); \ + if (fd < 0 || __fstat (fd, &statbuf) < 0 || ! S_ISDIR (statbuf.st_mode)) \ + { \ + if (fd >= 0) \ + __close (fd); \ + return NULL; \ + } \ + } while (0) +#endif + + /* Open a directory stream on NAME. */ DIR * __opendir (const char *name) @@ -58,9 +82,7 @@ __opendir (const char *name) return NULL; } - fd = __open (name, O_RDONLY|O_NDELAY); - if (fd < 0) - return NULL; + OPENDIR (name); if (__fcntl (fd, F_SETFD, FD_CLOEXEC) < 0) goto lose; |