Проект OpenNet: MAN fd (4) Специальные файлы /dev/* (FreeBSD и Linux)

Интерактивная система просмотра системных руководств (man-ов)

fd (4)

fd (4) ( Solaris man: Специальные файлы /dev/* )

>> fd (4) ( FreeBSD man: Специальные файлы /dev/* )

fd (4) ( Русские man: Специальные файлы /dev/* )

fd (4) ( Linux man: Специальные файлы /dev/* )

fd (7) ( Solaris man: Макропакеты и соглашения )

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.

IMPLEMENTATION NOTES

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

FILES

/dev/fd/#
/dev/stdin
/dev/stdout
/dev/stderr

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