Here's an excerpt from the close(2) syscall description:
RETURN VALUE
close() returns zero on success. On error, -1 is returned, and errno is set to indicate the error.
ERRORS
EBADF fd isn't a valid open file descriptor.
EINTR The close() call was interrupted by a signal; see signal(7).
EIO An I/O error occurred.
ENOSPC
EDQUOT On NFS, these errors are not normally reported against the first write which exceeds the available storage space, but instead against a subsequent
write(2), fsync(2), or close().
See NOTES for a discussion of why close() should not be retried after an error.
It obviously can fail due to a multitude of reasons.
Here's an excerpt from the close(2) syscall description:
RETURN VALUE close() returns zero on success. On error, -1 is returned, and errno is set to indicate the error.
ERRORS EBADF fd isn't a valid open file descriptor.
It obviously can fail due to a multitude of reasons.