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FCHOWN(3P) POSIX Programmer's Manual FCHOWN(3P)
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
fchown — change owner and group of a file
#include <unistd.h>
int fchown(int fildes, uid_t owner, gid_t group);
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.
Upon successful completion, fchown() shall return 0. Otherwise, it
shall return −1 and set errno to indicate the error.
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 privileges 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.
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);
None.
None.
None.
chown(3p)
The Base Definitions volume of POSIX.1‐2008, unistd.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 FCHOWN(3P)
Pages that refer to this page: unistd.h(0p)