ACCESS(S) XENIX System V ACCESS(S)
Name
access - Determines accessibility of a file.
Syntax
int access (path, amode)
char *path;
int amode;
Description
path points to a pathname naming a file. access checks the
named file for accessibility according to the bit pattern
contained in amode, using the real user ID in place of the
effective user ID, and the real group ID in place of the
effective group ID. The bit pattern for amode can be formed
by adding any combination of the following:
04 Read
02 Write
01 Execute (search)
00 Check existence of file
Access to the file is denied if one or more of the following
are true:
A component of the path prefix is not a directory.
[ENOTDIR]
Read, write, or execute (search) permission is
requested for a null pathname. [ENOENT]
The named file does not exist. [ENOENT]
Search permission is denied on a component of the path
prefix. [EACCES]
Write access is requested for a file on a read-only
file system. [EROFS]
Write access is requested for a pure procedure (shared
text) file that is being executed. [ETXTBSY]
Permission bits of the file mode do not permit the
requested access. [EACCES]
path points outside the process' allocated address
space. [EFAULT]
access checks the permissions for the owner of a file by
checking the ``owner'' read, write, and execute mode bits.
For members of the file's group, the ``group'' mode bits are
checked. For all others, the ``other'' mode bits are
checked.
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ACCESS(S) XENIX System V ACCESS(S)
Return Value
If the requested access is permitted, a value of 0 is
returned. Otherwise, a value of -1 is returned and errno is
set to indicate the error.
See Also
chmod(S), stat(S)
Notes
The super-user (root) may access any file, regardless of
permission settings.
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