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fchown.2freebsd
Langue: en
Version: 266476 (debian - 07/07/09)
Section: 2 (Appels système)
BSD mandoc
NAME
chown fchown lchown - change owner and group of a fileLIBRARY
Lb libcSYNOPSIS
In unistd.h Ft int Fn chown const char *path uid_t owner gid_t group Ft int Fn fchown int fd uid_t owner gid_t group Ft int Fn lchown const char *path uid_t owner gid_t groupDESCRIPTION
The owner ID and group ID of the file named by Fa path or referenced by Fa fd is changed as specified by the arguments Fa owner and Fa group . The owner of a file may change the Fa group to a group of which he or she is a member, but the change Fa owner capability is restricted to the super-user.The Fn chown system call clears the set-user-id and set-group-id bits on the file to prevent accidental or mischievous creation of set-user-id and set-group-id programs if not executed by the super-user. The Fn chown system call follows symbolic links to operate on the target of the link rather than the link itself.
The Fn fchown system call is particularly useful when used in conjunction with the file locking primitives (see flock(2)).
The Fn lchown system call is similar to Fn chown but does not follow symbolic links.
One of the owner or group id's may be left unchanged by specifying it as -1.
RETURN VALUES
Rv -stdERRORS
The Fn chown and Fn lchown will fail and the file will be unchanged if:- Bq Er ENOTDIR
- A component of the path prefix is not a directory.
- Bq Er ENAMETOOLONG
- A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
- Bq Er ENOENT
- The named file does not exist.
- Bq Er EACCES
- Search permission is denied for a component of the path prefix.
- Bq Er ELOOP
- Too many symbolic links were encountered in translating the pathname.
- Bq Er EPERM
- The operation would change the ownership, but the effective user ID is not the super-user.
- Bq Er EPERM
- The named file has its immutable or append-only flag set, see the chflags(2) manual page for more information.
- Bq Er EROFS
- The named file resides on a read-only file system.
- Bq Er EFAULT
- The Fa path argument points outside the process's allocated address space.
- Bq Er EIO
- An I/O error occurred while reading from or writing to the file system.
The Fn fchown system call will fail if:
- Bq Er EBADF
- The Fa fd argument does not refer to a valid descriptor.
- Bq Er EINVAL
- The Fa fd argument refers to a socket, not a file.
- Bq Er EPERM
- The effective user ID is not the super-user.
- Bq Er EROFS
- The named file resides on a read-only file system.
- Bq Er EIO
- An I/O error occurred while reading from or writing to the file system.
SEE ALSO
chgrp(1), chflags(2), chmod(2), flock(2), chown(8)STANDARDS
The Fn chown system call is expected to conform to St -p1003.1-90 .HISTORY
The Fn chown function appeared in AT&T System v7 . The Fn fchown system call appeared in BSD 4.2The Fn chown system call was changed to follow symbolic links in BSD 4.4 The Fn lchown system call was added in Fx 3.0 to compensate for the loss of functionality.
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