Parent process: why not finishing and how to make finish, Operating System

Parent process: why not finishing and how to make finish, Operating System

Assignment Help:

#include
#include
#include
#include
#include

int main(void)
{
int pchan[2], pid, rval, cvar;
char buf[20];
if (pipe(pchan) == -1){
perror("pipe");
exit(2);
}
switch (pid = fork() ){
case -1: perror("fork");
exit(2);
case 0:
close(0);
if (dup(pchan[0] != 0)){
perror("dup");
exit(3);
}

execlp("grep", "grep", "123", NULL);
perror("exec");
exit(4);
default:

for(cvar = 0; cvar < 200; cvar++){
rval = rand();
sprintf(buf, "%d\n", rval);
write(pchan[1], buf, strlen(buf));
}
if (close(pchan[0]) == -1 || close(pchan[1]) == -1){
perror("close");
exit(4);
}

wait(NULL);
return(0);
}

}

Related Discussions:- Parent process: why not finishing and how to make finish

Is disk scheduling useful in a single-user environment, Is disk scheduling,...

Is disk scheduling, other than FCFS scheduling, useful in a single-user environment? Explain your answer. In a single-user environment, the I/O queue usually is blank. Requests

Juliasos1234, whats 9 times 56

whats 9 times 56

Memory pages, Applications allocate memory in terms of the number of bytes ...

Applications allocate memory in terms of the number of bytes that they need, but this level of granularity is too ?ne-grained for the operating system to manage the system memory i

What is the lower bound on the numeral of page faults, Q. Presume that you...

Q. Presume that you have a page-reference string for a process with m frames (initially all empty). The page-reference string has length p along with n distinct page numbers

Choice of operating systems to boot from, Q. How could a system be designed...

Q. How could a system be designed to allow a choice of operating systems to boot from? What would the bootstrap program need to do? Answer: Delieve a system that would like to

Describe the technique of packing, Describe the technique of packing. T...

Describe the technique of packing. The physical record size will not accurately match the length of the desired logical record and the Logical records may even differ in length

Concepts of an address - data and control bus, Let us consider the operatio...

Let us consider the operation of the EPROM device in more detail. Consider the pining details below again Before we examine the interface means of the EPROM, it is worth

Bag of tasks, The producer-consumermodel above has a standard human analogy...

The producer-consumermodel above has a standard human analogy of an assembly line. Humans have specialized skills, however, whereas threads running the same program do not need to

Thread, Explain thread in details

Explain thread in details

Paae replacement algorithms, code for implementing NFU page replacement alg...

code for implementing NFU page replacement algorithm

Write Your Message!

Name

Email id

Message

Verfication Code

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd