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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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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.1‐2017, unistd.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
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 2017 FCHOWN(3P)
Pages that refer to this page: unistd.h(0p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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