Manual browser: fd(4)
|FD(4)||Kernel Interfaces Manual||FD(4)|
NAMEfd, stdin, stdout, stderr — file descriptor files
DESCRIPTIONThe 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);
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.
SEE ALSOtty(4), mount_fdesc(8)
NOTEThe floppy disk driver on some ports is also called fd; see fdc(4) for its documentation.
|December 29, 2013||NetBSD 7.0|