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Langue: en

Version: 300336 (debian - 07/07/09)

Section: 4 (Pilotes et protocoles réseau)

BSD mandoc


fd stdin stdout stderr - file descriptor files


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.


By default, /dev/fd is provided by devfs(5), which provides nodes for the first three file descriptors. Some sites may require nodes for additional file descriptors; these can be made available by mounting fdescfs(5) on /dev/fd




tty(4), devfs(5), fdescfs(5)
> Noëlle emule sans le savoir.
T'as pas oublié «tête d» avant un certain mot dans la phrase
précédente ?
-+- Frédéric à Noëlle, sur -+-