DragonFly On-Line Manual Pages


FD(4)		      DragonFly Kernel Interfaces Manual		 FD(4)

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) DragonFly 3.7 June 9, 1993 DragonFly 3.7