Amiga Unix — 68040 · 68060

Manual pages › File formats and configuration files (4)

fd(4)

file descriptor files

From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.

Also by this name: fd(7A), Amiga-specific devices

NAME

/dev/fd - file descriptor files

DESCRIPTION

These files, conventionally called /dev/fd/0, /dev/fd/1, /dev/fd/2, and so on, refer to files accessible through file descriptors. If file descriptor n is open, these two system calls have the same effect:

fd = open("/dev/fd/n",mode);
fd = dup(n);

On these files creat(2) is equivalent to open, and mode is ignored. As with dup, subsequent reads or writes on fd fail unless the original file descriptor allows the operations.

For convenience in referring to standard input, standard output, and standard error, an additional set of names is provided: /dev/fd/0 is a synonym for /dev/fd/0, /dev/fd/1 for /dev/fd/1, and /dev/fd/2 for /dev/fd/2.

SEE ALSO

open(2), dup(2)

DIAGNOSTICS

open(2) returns -1 and EBADF if the associated file descriptor is not open.