#include <unistd.h>

int fchown(int fildes, uid_t owner, gid_t group);


Declared, not implemented


IEEE Std 1003.1-2017


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.


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.



Known bugs


See Also

  1. Standard library functions
  2. Table of Contents