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RedHat 9 (Linux i386) - man page for chown (redhat section 2)

CHOWN(2)			    Linux Programmer's Manual				 CHOWN(2)

NAME
       chown, fchown, lchown - change ownership of a file

SYNOPSIS
       #include <sys/types.h>
       #include <unistd.h>

       int chown(const char *path, uid_t owner, gid_t group);
       int fchown(int fd, uid_t owner, gid_t group);
       int lchown(const char *path, uid_t owner, gid_t group);

DESCRIPTION
       The  owner  of  the  file  specified by path or by fd is changed.  Only the super-user may
       change the owner of a file.  The owner of a file may change the group of the file  to  any
       group of which that owner is a member.  The super-user may change the group arbitrarily.

       If the owner or group is specified as -1, then that ID is not changed.

       When the owner or group of an executable file are changed by a non-super-user, the S_ISUID
       and S_ISGID mode bits are cleared. POSIX does not specify whether this also should  happen
       when root does the chown; the Linux behaviour depends on the kernel version.  In case of a
       non-group-executable file (with clear S_IXGRP bit) the  S_ISGID	bit  indicates	mandatory
       locking, and is not cleared by a chown.

RETURN VALUE
       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS
       Depending  on  the file system, other errors can be returned.  The more general errors for
       chown are listed below:

       EPERM  The effective UID does not match the owner of the file, and is  not  zero;  or  the
	      owner or group were specified incorrectly.

       EROFS  The named file resides on a read-only file system.

       EFAULT path points outside your accessible address space.

       ENAMETOOLONG
	      path is too long.

       ENOENT The file does not exist.

       ENOMEM Insufficient kernel memory was available.

       ENOTDIR
	      A component of the path prefix is not a directory.

       EACCES Search permission is denied on a component of the path prefix.

       ELOOP  Too many symbolic links were encountered in resolving path.

       The general errors for fchown are listed below:

       EBADF  The descriptor is not valid.

       ENOENT See above.

       EPERM  See above.

       EROFS  See above.

       EIO    A low-level I/O error occurred while modifying the inode.

NOTES
       In versions of Linux prior to 2.1.81 (and distinct from 2.1.46), chown did not follow sym-
       bolic links.  Since Linux 2.1.81, chown does follow symbolic links, and	there  is  a  new
       system call lchown that does not follow symbolic links.	Since Linux 2.1.86, this new call
       (that has the same semantics as the old chown) has got the same syscall number, and  chown
       got the newly introduced number.

       The  prototype  for fchown is only available if _BSD_SOURCE is defined (either explicitly,
       or implicitly, by not defining _POSIX_SOURCE or compiling with the -ansi flag).

CONFORMING TO
       The chown call conforms to SVr4, SVID, POSIX, X/OPEN.  The 4.4BSD version can only be used
       by the superuser (that is, ordinary users cannot give away files).  SVr4 documents EINVAL,
       EINTR, ENOLINK and EMULTIHOP returns, but no ENOMEM.  POSIX.1 does not document ENOMEM  or
       ELOOP error conditions.

       The  fchown  call  conforms  to	4.4BSD	and SVr4.  SVr4 documents additional EINVAL, EIO,
       EINTR, and ENOLINK error conditions.

RESTRICTIONS
       The chown() semantics are deliberately violated on NFS file systems which have UID mapping
       enabled.   Additionally,  the semantics of all system calls which access the file contents
       are violated, because chown() may cause immediate access revocation on already open files.
       Client side caching may lead to a delay between the time where ownership have been changed
       to allow access for a user and the time where the file can actually  be	accessed  by  the
       user on other clients.

SEE ALSO
       chmod(2), flock(2)

Linux 2.1.81				    1997-05-18					 CHOWN(2)


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