06-17-2003
Quote:
Originally posted by Perderabo
That's up to the program that spawns the process. As a default, most shells will default stdout to /dev/tty. But if, for example, you do:
someprog > /dev/null
then stdout will be pointing to /dev/null.
sorry i don't know how it become like this .....hope i will be understood!
you mean u-ofile[0] connects to struct tty?
or it still connects first to struct file then to inode?
if it is an ordinary file it will connect like this:
process pa
u-ofile
stdin
stdout
stderr
fd1--------->file structure---->inode
Is it like:
process pa
u-ofile
| stdin |
| stdout |--------->tty
| stderr |
?
right??
Last edited by jiangyanna; 06-17-2003 at 09:05 AM..
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LEARN ABOUT DEBIAN
stdout
FD(4) BSD 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.
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
SEE ALSO
tty(4), devfs(5), fdescfs(5)
BSD
June 9, 1993 BSD