FD
Section: Devices and Network Interfaces (4)
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BSD mandoc
NAME
fd
stdin
stdout
stderr
- file descriptor files
DESCRIPTION
The files
/dev/fd/0
through
/dev/fd/#
refer to file descriptors which can be accessed through the file
system.
If the file descriptor is open and the mode the file is being opened
with is a subset of the mode of the existing descriptor, the call:
fd = open("/dev/fd/0", mode);
and the call:
fd = fcntl(0, F_DUPFD, 0);
are equivalent.
Opening the files
/dev/stdin
/dev/stdout
and
/dev/stderr
is equivalent to the following calls:
fd = fcntl(STDIN_FILENO, F_DUPFD, 0);
fd = fcntl(STDOUT_FILENO, F_DUPFD, 0);
fd = fcntl(STDERR_FILENO, F_DUPFD, 0);
Flags to the
open(2)
call other than
O_RDONLY ,
O_WRONLY
and
O_RDWR
are ignored.
FILES
- /dev/fd/#
-
- /dev/stdin
-
- /dev/stdout
-
- /dev/stderr
-
SEE ALSO
tty(4)
HISTORY
The
descriptor implementation
Ud
Index
- NAME
-
- DESCRIPTION
-
- FILES
-
- SEE ALSO
-
- HISTORY
-
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Time: 06:48:41 GMT, May 19, 2025