ext4: add support for printing the error code associated with an error

[tools/e2fsprogs.git] / lib / e2p / fsetflags.c

diff --git a/lib/e2p/fsetflags.c b/lib/e2p/fsetflags.c
index 5c76083..027834b 100644 (file)
--- a/lib/e2p/fsetflags.c
+++ b/lib/e2p/fsetflags.c
@@ -5,8 +5,10 @@
  *                           Laboratoire MASI, Institut Blaise Pascal
  *                           Universite Pierre et Marie Curie (Paris VI)
  *
- * This file can be redistributed under the terms of the GNU Library General
- * Public License
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
  */
 
 /*
@@ -14,24 +16,47 @@
  * 93/10/30    - Creation
  */
 
+#ifndef _LARGEFILE_SOURCE
+#define _LARGEFILE_SOURCE
+#endif
+#ifndef _LARGEFILE64_SOURCE
+#define _LARGEFILE64_SOURCE
+#endif
+
+#include "config.h"
 #if HAVE_ERRNO_H
 #include <errno.h>
 #endif
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
-#if HAVE_CHFLAGS
-#include <sys/stat.h>          /* For the flag values.  */
-#else
+#include <sys/types.h>
+#include <sys/stat.h>
+#if HAVE_EXT2_IOCTLS
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #endif
 
 #include "e2p.h"
 
+/*
+ * Deal with lame glibc's that define this function without actually
+ * implementing it.  Can you say "attractive nuisance", boys and girls?
+ * I knew you could!
+ */
+#ifdef __linux__
+#undef HAVE_CHFLAGS
+#endif
+
+#ifdef O_LARGEFILE
+#define OPEN_FLAGS (O_RDONLY|O_NONBLOCK|O_LARGEFILE)
+#else
+#define OPEN_FLAGS (O_RDONLY|O_NONBLOCK)
+#endif
+
 int fsetflags (const char * name, unsigned long flags)
 {
-#if HAVE_CHFLAGS
+#if HAVE_CHFLAGS && !(APPLE_DARWIN && HAVE_EXT2_IOCTLS)
        unsigned long bsd_flags = 0;
 
 #ifdef UF_IMMUTABLE
@@ -48,21 +73,35 @@ int fsetflags (const char * name, unsigned long flags)
 #endif
 
        return chflags (name, bsd_flags);
-#else
+#else /* !HAVE_CHFLAGS || (APPLE_DARWIN && HAVE_EXT2_IOCTLS) */
 #if HAVE_EXT2_IOCTLS
-       int fd, r, f;
+       int fd, r, f, save_errno = 0;
+       struct stat buf;
 
-       fd = open (name, O_RDONLY|O_NONBLOCK);
+       if (!lstat(name, &buf) &&
+           !S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode)) {
+               goto notsupp;
+       }
+#if !APPLE_DARWIN
+       fd = open (name, OPEN_FLAGS);
        if (fd == -1)
                return -1;
        f = (int) flags;
        r = ioctl (fd, EXT2_IOC_SETFLAGS, &f);
+       if (r == -1)
+               save_errno = errno;
        close (fd);
+       if (save_errno)
+               errno = save_errno;
+#else /* APPLE_DARWIN */
+       f = (int) flags;
+       return syscall(SYS_fsctl, name, EXT2_IOC_SETFLAGS, &f, 0);
+#endif /* !APPLE_DARWIN */
        return r;
-#else /* ! HAVE_EXT2_IOCTLS */
-       extern int errno;
+
+notsupp:
+#endif /* HAVE_EXT2_IOCTLS */
+#endif
        errno = EOPNOTSUPP;
        return -1;
-#endif /* ! HAVE_EXT2_IOCTLS */
-#endif
 }