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Filesystems, Disks and Memory
where does stdout link to?
Post 37329 by jiangyanna on Tuesday 17th of June 2003 07:51:31 AM
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.
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.
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 | file inode
------------- -------------- ------------
| |------------------------> | |--------->| |
------------- -------------- ------------
Is it like:
process pa
u-ofile
-------------
| stdin | tty
------------- ----------------
| stdout |-----------------------> | |
------------- ---------------
| stderr |
-------------
?
right??
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LEARN ABOUT OSF1
link
link(1) General Commands Manual link(1) NAME
link, unlink - Creates an additional directory entry for an existing file SYNOPSIS
link file1 file2 unlink file STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: link: XCU5.0 unlink: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. DESCRIPTION
The link command performs the link() system call to create an additional directory entry for an existing file, file1. In effect, the underlying file then has two names, file1 and file2 (either of these arguments can be a pathname). The old and new entries share equal access rights to the underlying file. The unlink command performs the unlink() system call to remove a link to file created by link. The unlink command removes the directory entry specified by the file parameter and, if the entry is a hard link, decrements the link count of the file referenced by the link. You should be familiar with the link() and unlink() system calls before you use these commands. The link and unlink commands do not issue error messages when the associated system call is unsuccessful. NOTES
The link and unlink commands cannot be used to link and unlink directories. EXIT STATUS
The link and unlink commands both exit with the following: The link() or unlink() system call succeeded. Too few or too many arguments specified. The link() or unlink() system call failed. SEE ALSO
Commands: fsck(8), ln(1) Functions: link(2), unlink(2) link(1)