1. Programming

i can't find any info on developing for magnetic card readers in the unix environment. I'm developing a POS system and i want it to include credit card verification. Any direction would be hot... (6 Replies)

2. Programming

Could someone Help me with this code please? #include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <string.h> #include <fcntl.h> #define SIZE_B 256 /*buffer's size */ #define NUM_ARG 20 /* max number of args for any command */ int... (4 Replies)

3. UNIX for Advanced & Expert Users

Hello! How I can increase (or decrease) the predefined pipe buffer size? Thanks! (1 Reply)

4. Shell Programming and Scripting

Hi!! I have a problem reading from a fifo pipe in shell script. The idea is simple, I have a C program with two pipe files: An input pipe I use to send commands in shell script to the C program (echo "command" > input.pipe) An output pipe that I read the result of the command also in... (4 Replies)

5. UNIX for Dummies Questions & Answers

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)

6. Programming

Hi guys. 1. how much is the size of pipe?(i mean the buffer size) 2. is this size different in various UNIX derivations? 3. what happens if we write to a full pipe? does it block until get some free space(the other side receive data) or returns an error? 3. FIFO s are physical files on the... (2 Replies)

7. Shell Programming and Scripting

I'm trying to read a fifo using awk and comming across some problems. I'm writing to the fifo from multiple processes invoked by GNU Parallel: mkfifo my_fifo awk '{ a = a + $2 } END { for (i in a) print i, a }' my_fifo | sort -nk1 > sorted_output grep -v '^@' massive_file | parallel... (3 Replies)

8. Programming

When a write() writes on a broken pipe, with no readers, it generates a SIGPIPE signal and the process exits. When the write() returns -1 and errno is EPIPE? Do I have an handler for SIGPIPE, or can I ignore it? (2 Replies)

9. Shell Programming and Scripting

I have created a fifo named pipe in solaris, which writes the content of a file, line by line, into pipe as below: $ mkfifo namepipe $ cat books.txt "how to write unix code" "how to write oracle code" $ cat books.txt >> namepipe & I have a readpipe.sh script which reads the named... (2 Replies)