Visit Our UNIX and Linux User Community


FIFO not working in a loop


 
Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users FIFO not working in a loop
# 1  
Old 08-18-2009
FIFO not working in a loop

i downloaded the source for the code given in Unix network programming by R. Stevens. i tried a fifo program like below.

in the client program:-
created the server fifo
send the data throgh that fifo
wait for the result through another fifo created by client

in the server program:-
created the FIFO for server to get values
open it for read and then write
get data from client
process the request
then reply through another FIFO made by client

During the first run it works, ie, i send the name of a file and it replies with the content of the file. but when i put in a loop and try the the first time it works.. but during the second run it gives no reply....

if somebody can analyse it with this.. pls let me know.. otherwise just tell me i will attach the source
# 2  
Old 08-19-2009
Hi!

Yes, please post some code.

Cheers,
Loc

Previous Thread | Next Thread
Test Your Knowledge in Computers #544
Difficulty: Medium
Using global variables is generally considered a best practice in modern programming languages..
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

For-loop not working

Hello all, I would like to unzip some files with a for-loop. Is there anyone who could tell me how I should do this - in a correct way? for file in $(ls); do echo gzip -d < $file | tar xf -; done The problem is the pipe - I believe. But how could I do it? I need it for the command... (4 Replies)
Discussion started by: API
4 Replies

2. UNIX for Dummies Questions & Answers

for loop not working

Hi, I have ten different files to extract. so I thought for loop will help me. but it's not working for me. Please advice what I am doing wrong. for INCI in 1 2 3 4 5 6 7 8 9 10 do tar -xvf Update_INCI11.10.002_lnx86_1of10.tar done second file name is... (3 Replies)
Discussion started by: samnyc
3 Replies

3. Shell Programming and Scripting

For loop not working

Hi All, For loop in ksh not working if it was given in the following method. simple script: for i in {1..4} do echo $i done Output: {1..4} Even below also not working :( Script: for (( c=1; c<=5; c++ )) do echo "Welcome $c times..." done Output: ./x.sh: 0403-057 Syntax error... (13 Replies)
Discussion started by: girish_satyam
13 Replies

4. Shell Programming and Scripting

while loop not working

hi everyone i am facing a very strange problem . please help me why my while loop is not working. below is my code #!/bin/ksh file=RCMC_ABC_999_080924_210813.DAR echo ${file} value=001 count=10 echo "abc" echo ${count} value=$((${value} + 1 )) echo ${value} while ] do echo... (3 Replies)
Discussion started by: aishsimplesweet
3 Replies

5. Shell Programming and Scripting

While loop not working

here we go.. While loop is not working file.. It also invokes one more shell scripts for which parameters need to passed on. while read line do #### #### We want to have a logfile for each load #### PLog="${LogDir}/${Script}.log"; #### ... (5 Replies)
Discussion started by: premkumardr
5 Replies

6. UNIX for Advanced & Expert Users

If loop is not working

The following piece of code is not running because it is fails to go inside the if condition. i want to create a directory if there is no directory in the input path. i am using Linux, by CENT. Please help. echo " Enter the path where you u want to extract the tar" read EXTRACT_PATH ls -ld... (12 Replies)
Discussion started by: toanilsharma1
12 Replies

7. UNIX for Dummies Questions & Answers

If then else loop not working

If then else segment of below code is not working. For each filename code is displaying output for if part as well as else part. Please help its urgent. for usercusttop in `echo ${filename}|sort|uniq|cut -c 1-${actualwordcount}` do ... (2 Replies)
Discussion started by: findprakash
2 Replies

8. Shell Programming and Scripting

For loop not working...! :(

Could some one help me on this... For loop is working...! for x in $i do for y in $j do z=`echo $y | awk '{print $2}'` if then FS=`/usr/bin/echo $y` echo $FS >>$Basic_location/out.csv fi done CPRT="Cpoyright @ BTOIDCIM" done (3 Replies)
Discussion started by: bullz26
3 Replies

9. UNIX for Dummies Questions & Answers

fifo or named pipe working?

Can someone explain to me the working of fifo() system call using simple C programs so that I can implement them in the UNIX environement? (1 Reply)
Discussion started by: lvkchaitanya
1 Replies

10. Shell Programming and Scripting

Loop not working

Apologize if this is doesn't come under this group. I have a small script to find out users who last logged in to check there mail. (Tru 64 4.0, Netscape mail 3.6) -----> cat $1|awk -F: '$2=="SMTP-Accept" && $5~/@maildomain/ {s=$5;u++;las=substr($1)} END {for (i in u) {print... (2 Replies)
Discussion started by: nitin
2 Replies

Featured Tech Videos