FCHOWN
Section: POSIX Programmer's Manual (P)
Updated: 2003
NAME
fchown - change owner and group of a file
SYNOPSIS
#include <unistd.h>
int fchown(int fildes, uid_t owner, gid_t
group);
DESCRIPTION
The fchown() function shall be equivalent to chown() except
that the file
whose owner and group are changed is specified by the file descriptor
fildes.
RETURN VALUE
Upon successful completion, fchown() shall return 0. Otherwise,
it shall return -1 and set errno to indicate the
error.
ERRORS
The fchown() function shall fail if:
- EBADF
-
The fildes argument is not an open file descriptor.
- EPERM
-
The effective user ID does not match the owner of the file or the
process does not have appropriate privilege and
_POSIX_CHOWN_RESTRICTED indicates that such privilege is required.
- EROFS
-
The file referred to by fildes resides on a read-only file system.
The fchown() function may fail if:
- EINVAL
-
The owner or group ID is not a value supported by the implementation.
The fildes argument refers to a pipe or socket
or an fattach()-ed STREAM and the implementation disallows
execution of fchown() on a pipe.
- EIO
-
A physical I/O error has occurred.
- EINTR
-
The fchown() function was interrupted by a signal which was
caught.
The following sections are informative.
EXAMPLES
Changing the Current Owner of a File
The following example shows how to change the owner of a file named
/home/cnd/mod1 to "jones" and the group to
"cnd".
The numeric value for the user ID is obtained by extracting the user
ID from the user database entry associated with "jones".
Similarly, the numeric value for the group ID is obtained by extracting
the group ID from the group database entry associated with
"cnd". This example assumes the calling program has appropriate privileges.
-
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <pwd.h>
#include <grp.h>
struct passwd *pwd;
struct group *grp;
int fildes;
...
fildes = open("/home/cnd/mod1", O_RDWR);
pwd = getpwnam("jones");
grp = getgrnam("cnd");
fchown(fildes, pwd->pw_uid, grp->gr_gid);
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
chown() , the Base Definitions volume of IEEE Std 1003.1-2001,
<unistd.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- Changing the Current Owner of a File
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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