stdout/stdin + flushing buffers


 
Thread Tools Search this Thread
Top Forums Programming stdout/stdin + flushing buffers
# 8  
Old 09-30-2008
According to C standards, fflush() on stdin produces undefined results. That means if it works it is by pure luck.

If you read the FAQ here:
http.cboard.cprogramming.com

Ther is a discussion of "fflushing" stdin and how to deal with it.
# 9  
Old 10-01-2008
Granted, the OP seems to have some confusion in destinguishing input from output, but I don't think anyone suggested to him to fflush stdin.
# 10  
Old 10-02-2008
Quote:
Originally Posted by calv
Granted, the OP seems to have some confusion in destinguishing input from output, but I don't think anyone suggested to him to fflush stdin.
In my code, there is an erronous call to fflush(stdin). Even after removing this and using

printf()
fflush(stdout)
scanf()

which is in my code btw, this has not rectified the problem.

Im not sure what could be the cause of error at this stage.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

[stdin / stdout] Strategies for redirecting outputs

Well.. let's say i need to write a pretty simple script. In my script i have 2 variables which can have value of 0 or 1. $VERBOSE $LOG I need to implement these cases: ($VERBOSE = 0 && $LOG = 0) => ONLY ERROR output (STDERR to console && STDOUT to /dev/null) ($VERBOSE = 1... (5 Replies)
Discussion started by: Marmz
5 Replies

2. UNIX for Advanced & Expert Users

How to set font color for STDIN,STDOUT and STDERR?

I want to differentiate the STDOUT and STDERR messages in my terminal . If a script or command is printing a message in terminal I want to differentiate by colors, Is it possible ? Example: $date Wed Jul 27 12:36:50 IST 2011 $datee bash: datee: command not found $alias ls alias... (2 Replies)
Discussion started by: ungalnanban
2 Replies

3. UNIX for Dummies Questions & Answers

STDIN and STDOUT

Hallo, i have a script like: if ;then echo "OK" else echo "ERROR $2 is missing" fi; if ;then touch $2 fi; if ;then cat $1 | grep xy > $2 (1 Reply)
Discussion started by: eightball
1 Replies

4. Programming

read and write stdin/stdout in unix

Hi, i am using the below program to read from the standard input or to write to standard out put. i know that using highlevel functions this can be done better than what i have done here. i just want to know is there any other method by which i find the exact number of characters ( this... (3 Replies)
Discussion started by: MrUser
3 Replies

5. Programming

Controlling a child's stdin/stdout (not working with scp)

All, Ok...so I know I *should* be able to control a process's stdin and stdout from the parent by creating pipes and then dup'ing them in the child. And, this works with all "normal" programs that I've tried. Unfortunately, I want to intercept the stdin/out of the scp application and it seems... (9 Replies)
Discussion started by: DreamWarrior
9 Replies

6. Shell Programming and Scripting

Redirecting stdin/stdout to/from command from/to string

Hi, I am working on a project where I have to generate and execute nasm code on-the-fly. I generate the code in a file program.asm and then execute it.This output is to stdout which i redirect to an output file which i read back to compare results: system("nasm -f elf program.asm >... (5 Replies)
Discussion started by: doc_cypher
5 Replies

7. Shell Programming and Scripting

can't close stdin/stdout in shell

#!/bin/sh exec 0</dev/null exec 1>/dev/null ls -l /proc/self/fd >&2 produces total 0 lr-x------ 1 tyler users 64 Feb 18 10:38 0 -> /proc/7886/fd lrwx------ 1 tyler users 64 Feb 18 10:38 1 -> /dev/pts/4 lrwx------ 1 tyler users 64 Feb 18 10:38 2 -> /dev/pts/4 I've verified the shell is... (10 Replies)
Discussion started by: Corona688
10 Replies

8. UNIX for Dummies Questions & Answers

Redirect stdin stdout to multiple files

Hi, i know how to a) redirect stdout and stderr to one file, b) and write to two files concurrently with same output using tee command Now, i want to do both the above together. I have a script and it should write both stdout and stderr in one file and also write the same content to... (8 Replies)
Discussion started by: ysrini
8 Replies

9. Shell Programming and Scripting

Wrapper script for image deployment - stdin/stdout - named pipes and the like

Hi everyone, first post here. Anyone who isn't interested in the background, press pagedown :). I sometimes need to make scripts for little things I need in the infrastructure at the company I work at. Currently I am trying to make a wrapper script for a proprietary image-deployment program.... (2 Replies)
Discussion started by: andreas.ericson
2 Replies

10. Programming

C++ How to use pipe() & fork() with stdin and stdout to another program

Hi, Program A: uses pipe() I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using: * child -> dup2(fd, STDOUT_FILENO); -> execl("/path/PROGRAM B", "PROGRAM B", NULL); * parent -> char line; -> read(fd, line, 100); Question:... (2 Replies)
Discussion started by: vvaidyan
2 Replies
Login or Register to Ask a Question