04-23-2004
Instead of x meaning search, think of it as "use" a directory.
With r permission only, you can list the files in a directory but you can't open them or stat them. And you can't cd to the directory either. The directory is reduced to being just a list filenames. It has sorta lost the special status that directories have.
With x permission only, you can cd to a directory but you can't list the files. If you happen to know a filename, you can open (file permissions allowing) or stat that file.
By the way, stat'ing a file is required for ls -l. stat'ing a file is also how "ls" gets an inode number. So "ls -i" needs x permission as well.
I don't think it makes sense to give a user just r or x on a directory. With me, it's always both or none.
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LEARN ABOUT OPENSOLARIS
stat
stat.h(3HEAD) Headers stat.h(3HEAD)
NAME
stat.h, stat - data returned by stat system call
SYNOPSIS
#include <sys/types.h>
#include <sys/stat.h>
DESCRIPTION
The system calls stat, lstat and fstat return data in a stat structure, which is defined in <stat.h>.
The constants used in the st_mode field are also defined in this file:
#define S_IFMT /* type of file */
#define S_IAMB /* access mode bits */
#define S_IFIFO /* fifo */
#define S_IFCHR /* character special */
#define S_IFDIR /* directory */
#define S_IFNAM /* XENIX special named file */
#define S_INSEM /* XENIX semaphore subtype of IFNAM */
#define S_INSHD /* XENIX shared data subtype of IFNAM */
#define S_IFBLK /* block special */
#define S_IFREG /* regular */
#define S_IFLNK /* symbolic link */
#define S_IFSOCK /* socket */
#define S_IFDOOR /* door */
#define S_ISUID /* set user id on execution */
#define S_ISGID /* set group id on execution */
#define S_ISVTX /* save swapped text even after use */
#define S_IREAD /* read permission, owner */
#define S_IWRITE /* write permission, owner */
#define S_IEXEC /* execute/search permission, owner */
#define S_ENFMT /* record locking enforcement flag */
#define S_IRWXU /* read, write, execute: owner */
#define S_IRUSR /* read permission: owner */
#define S_IWUSR /* write permission: owner */
#define S_IXUSR /* execute permission: owner */
#define S_IRWXG /* read, write, execute: group */
#define S_IRGRP /* read permission: group */
#define S_IWGRP /* write permission: group */
#define S_IXGRP /* execute permission: group */
#define S_IRWXO /* read, write, execute: other */
#define S_IROTH /* read permission: other */
#define S_IWOTH /* write permission: other */
#define S_IXOTH /* execute permission: other */
The following macros are for POSIX conformance (see standards(5)):
#define S_ISBLK(mode) block special file
#define S_ISCHR(mode) character special file
#define S_ISDIR(mode) directory file
#define S_ISFIFO(mode) pipe or fifo file
#define S_ISREG(mode) regular file
#define S_ISSOCK(mode) socket file
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
stat(2), types.h(3HEAD), attributes(5), standards(5)
SunOS 5.11 30 Aug 2002 stat.h(3HEAD)