04-23-2009
Why is it denying me permission?
I have created a file and set the permission to read and write only for user and group. Here is how I did it:
chmod filename 660
I used ls -l to see and the changes are right so, why is it saying permission denied when I try to change into it. When I type cd filename, I am told permission denied. Why?
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access(2) System Calls Manual access(2)
NAME
access - Determines the accessibility of a file
SYNOPSIS
#include <unistd.h>
int access (
const char *path,
int access_mode) ;
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
access(): XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
PARAMETERS
Points to the file pathname. When the path parameter refers to a symbolic link, the access() function returns information about the file
pointed to by the symbolic link.
Permission to access all components of the path parameter is determined by using a real user ID instead of an effective user ID, and
a group access list (including a real group ID) instead of an effective group ID. Specifies the type of access. The bit pattern
contained in the access_mode parameter is constructed by a logical OR of the following values: Checks read permission. Checks write
permission. Checks execute (search) permission. Checks to see if the file exists.
DESCRIPTION
The access() function checks for accessibility of the file specified by a pathname.
Only access bits are checked. A directory may be indicated as writable by access(), but an attempt to open it for writing will fail
(although files may be created there); a file's access bits may indicate that it is executable, but the execve() function can fail if the
file does not contain the proper format.
RETURN VALUES
Upon successful completion, the access() function returns value of 0 (zero). Otherwise, a value of -1 is returned and errno is set to
indicate the error.
ERRORS
If the access() function fails, access to the file specified by the path parameter is denied and errno may be set to one of the following
values: Permission bits of the file mode do not permit the requested access, or search permission is denied on a component of the path pre-
fix. The owner of a file has permission checked with respect to the ``owner'' read, write, and execute mode bits, members of the file's
group other than the owner have permission checked with respect to the ``group'' mode bits, and all others have permissions checked with
respect to the ``other'' mode bits. The path parameter points outside the process' allocated address space. The pathname contains a char-
acter with the high-order bit set. An I/O error occurred while reading from or writing to the file system. Too many symbolic links were
encountered in translating the pathname. A component of a pathname exceeded PATH_MAX characters, or an entire pathname exceeded NAME_MAX
characters. The named file does not exist or is an empty string. A component of the path prefix is not a directory. Write access is
requested for a file on a read-only file system.
RELATED INFORMATION
Functions: chmod(2), stat(2)
Standards: standards(5) delim off
access(2)