Hi Here are the results for Linux 2.2.19 on my Potato 2.2r4 box with an ext2 file system.
General note: On this system, man 2 chmod does not specify
either way the effect of using an invalid mode, so I think this
is undefined behavior, although it has been explicitly
implemented for some reason. Here are the relevant lines from
the actual Linux 2.2.19 kernel source file fs/open.c:
if (mode == (mode_t) -1)
mode = inode->i_mode;
newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
[Edited to remove control chars (^H etc.)]
Script started on Sat Dec 1 00:36:56 2001
$ cat foo.c
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
int
main(int ac, char **av)
{
if (ac == 3) {
char *fn = av[1];
char *md = av[2];
int mode = 0xffff;
sscanf(md, "%x", &mode);
if (!chmod(fn, mode)) {
printf("chmod ok\n");
} else {
printf("chmod barfed; error = %s\n",
strerror(errno)); }
}
return 0;
}
$ chmod 664 foo.c
$ ls -l foo.c
-rw-rw-r-- 1 jbj jbj 480 Dec 1 00:36 foo.c
$ gcc -o foo foo.c
$ uname -a
Linux jbj2 2.2.19 #1 Fri Oct 19 22:03:10 CEST 2001 i586 unknown
$ echo Debian 2.2r4
Debian 2.2r4
$ ./foo foo.c ffff
chmod ok
$ ls -l foo.c
-rw-rw-r-- 1 jbj jbj 480 Dec 1 00:36 foo.c
$ exit
Script done on Sat Dec 1 00:39:08 2001
On Fri, Nov 30, 2001 at 10:14:45AM +0100, Russell Coker wrote:
> This apparently concerns a KDE bug. Can we get a list of how the various
> Linux ports work?
>
...
--
This message is hastily written, please ignore any unpleasant wordings,
do not consider it a binding commitment, even if its phrasing may
indicate so. Its contents may be deliberately or accidentally untrue.
Trademarks and other things belong to their owners, if any.
pgp8hin9OzcNd.pgp
Description: PGP signature
