Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Difference between file descriptor and file pointer Post 302444961 by jlliagre on Friday 13th of August 2010 09:56:58 AM
Old 08-13-2010
A file descriptor is an index in a per process table. It isn't predefined outside 0, 1 and 2 which are stdin, stdout and stderr when the process starts.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

file activity (open/closed) file descriptor info using KORN shell scripting

I am trying to find a way to check the current status of a file. Such as some cron job processes are dependent on the completion of others. if a file is currently being accessed / modified or simply open state I will wait until it is done being processed before attempting the next process on that... (3 Replies)
Discussion started by: Gary Dunn
3 Replies

2. UNIX for Dummies Questions & Answers

File Descriptor Help

What is a file descriptor in Unix?? How to find a file descriptor of a file in Unix?? Does it have anything to do with the Inode numbers?? (3 Replies)
Discussion started by: rahulrathod
3 Replies

3. UNIX for Dummies Questions & Answers

confusion (file pointer and file descripter)

Hi everybody, i am newbie to unix and confused with file pointers and file descripters. could anyone help me to clear my doubts .. when we call unix system calls to create a file then we are dealing wih file descripters i think file descripters are also normals file as stored inhard disks... (1 Reply)
Discussion started by: johnray31
1 Replies

4. Programming

Get the file descriptor of a socket file. C vs Python.

Hi, I want to validate that a file is a socket file on Linux. I know I can do this using the S_ISSOCK macro, but I am not sure how to get the file descriptor for the socket file. For example, I know that /tmp/mapping-foo is a socket file. In Python I can do something like this: >>> import... (2 Replies)
Discussion started by: goon12
2 Replies

5. Shell Programming and Scripting

File Descriptor

Hello All, Im opening a file desciptor in perl and sending data using print CMD "$xyz". is there a limit to the length of the string that I can give to this CMD at a time. (3 Replies)
Discussion started by: rimser9
3 Replies

6. UNIX for Dummies Questions & Answers

File Descriptor

Hi What the below path contains? /proc/<pid>/fd (1 Reply)
Discussion started by: siba.s.nayak
1 Replies

7. Programming

Copying and overwriting a file using file descriptor

Hi , i have two basic requirement on linux platform . I am using C language to do this . 1) copying one file to another (assuming i know their file descriptors) 2) Overwriting a file using it file descriptor . Please guide. regards Aki (2 Replies)
Discussion started by: meet123321
2 Replies

8. Shell Programming and Scripting

file descriptor KSH

Hello, How can i use file descriptor in a script to read 2 files at the same time and extract line 200 from file 1 and line 500 from file 2. Thanks. (6 Replies)
Discussion started by: LiorAmitai
6 Replies

9. Shell Programming and Scripting

file descriptor count

I am trying to write a script which will only show me the file descriptor count for a process/pid. My script will return me the count only not the whole output. For example, I would like my script to return the output 23 this case, not the whole output. Can anybody please help me how do I get... (11 Replies)
Discussion started by: mohullah
11 Replies

10. Shell Programming and Scripting

Variable File Descriptor

Greetings. I am happily using constructs like the following; I have set -x to show fine distinctions. $ exec 4> afile + exec + 4> afile $ print -u4 This is the first line in afileAs you can see from the -x expansion, the shell performed the exec command and redirected file descriptor to... (4 Replies)
Discussion started by: rpaskudniak
4 Replies
OMPI-IOF(1)							     Open MPI							       OMPI-IOF(1)

NAME
ompi-iof, orte-iof - Displays a copy of the output streams from a process. NOTE: ompi-iof, and orte-iof are exact synonyms for each other. Using any of the names will result in exactly identical behavior. SYNOPSIS
ompi-iof [ options ] Options ompi-iof will display a copy of the indicated stdout, stderr, and/or stddiag streams from the designated process. -pid | --pid The pid of the mpirun executing the process whose streams are to be copied -stdout | --stdout Display a copy of the specified process' stdout. If no options are specified, this will act as the default -stderr | --stderr Display a copy of the specified process' stderr. -stddiag | --stddiag Display a copy of the specified process' stddiag. -rank | --rank The rank of the process whose output is to be copied. DESCRIPTION
ompi-iof displays a copy of the indicated stdout, stderr, and/or stddiag streams from the designated process. At this time, a ctrl-C must be used to terminate the program. The program will terminate cleanly, telling the associated mpirun to close the requested streams before exiting. SEE ALSO
orterun(1) 1.4.5 Feb 10, 2012 OMPI-IOF(1)
All times are GMT -4. The time now is 04:28 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy