UNIX File Descriptors
An Introduction |
Prof. David Bernstein
|
Computer Science Department |
bernstdh@jmu.edu |
dup()
)
open()
is called multiple
times for the same file)errno
EBADF
|
fd isn't a valid open file descriptor |
EMFILE
|
The per-process limit has been reached |
/dev/fd
:
/dev/fd/n
where n is one of the
process's open file descriptors/dev/fd
is
equivalent to reopening the oritinal file/dev/fd
is
equivalent to calling dup()
/dev/stdin
, /dev/stdout
, and
/dev/stderr
are symbolic links to
/dev/fd/0
, /dev/fd/1
, and
/dev/fd/2
FILE*
not a file descriptorFILE*
(i.e.,
stream) with a file descriptor