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i used this link's instr but i still cant get it to work.

http://www.ecst.csuchico.edu/~beej/guide/ipc/shmem.html

i only check pid1 equal zero because i want to tell the difference between the parent and the child.

and i don't understand the IPC_CREAT flag. i know how to use them with semaphores but not...

what i want to do is have an int that can been written into by 2 processes but my code doesn't seem to work.


#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include...

what i did was just define a number of KEYs equal to the number of semaphores i wanted and then i created 2 struct to create the functions up and down. i didn't use a void main, just main. Why would...

sorry, forgot to update this. i found out that i needed to create a stuct that would implement the function i wanted. increment the semaphore by 1 or decrease it by 1.

here is where i got the idea...

been searching around on how to use an up and down function with semaphores but i can't find an example. i looked into using: "semop" but i have no idea how to use it. I have been able to declared...

omg it works... !!!! wow thanks. all i want was for 2 processes to read from the same file one line at a time

this is what i have now still no idea why is doesn't work


#include <stdio.h>
#include <fcntl.h>
main( )
{
FILE *fileptr;
char temp1[100];
char buff2[20];
int pid2;
FILE * fileptr1;...

i really can't use read do to the fact that i want it to read a whole line and all the lines aren't the same length. i got it to work using read but it didn't complete my objective to read line by...

i'm tring to make 2 processes each read from the same file but only one of them read the file.


FILE * fileptr1;
fileptr1 = fopen("file1.txt","rt");
pid2=fork();
while(1)
{...

i'm just trying to make 2 process read from the same 1 line a time. For some reason only the child reads.


#include<stdio.h>
#include <sys/types.h>
void getlinefromfilep(void);
void...