int fchown(int fildes, uid_t owner, gid_t group);
Declared, not implemented
IEEE Std 1003.1-2017
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
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_RESTRICTEDindicates that such privilege is required.
EROFS- The file referred to by fildes resides on a read-only file system.
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.
fchown()function was interrupted by a signal which was caught.