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

Why high level languages need compiler, Q. Why High level languages need Co...

Q. Why High level languages need Compiler? High level languages - illustrations are COBOL, FORTRAN, PL/I andALGOL - are processed by interpreters andcompilers. A compilers is a

Explain time-sharing environment, In a multiprogramming and time-sharing en...

In a multiprogramming and time-sharing environment, several users share the system simultaneously. This situation can result in various security problems. a

Processes, draw a state diagram showing the transissions of a process from ...

draw a state diagram showing the transissions of a process from creation to termination

Advantages and disadvantages of thread, OPERATING SYSTEM 1. Describe th...

OPERATING SYSTEM 1. Describe the term operating system. Write down the functions of operating system. 2. Explain Thread? Write down the advantages and disadvantages of threa

Explain hashed page table method, Hashed page table method A general ap...

Hashed page table method A general approach for managing address spaces larger than 32 bits is to use a hashed page table with the hash values being the virtual-page number.

Explain about interprocess communication, Explain about interprocess commun...

Explain about interprocess communication The cooperating processes communicate with each other via an interprocess communication facility. IPC gives a mechanism to permit proce

Threads, bootstrap

bootstrap

Write a short note on peer-to-peer computing, Write a short note on peer-to...

Write a short note on peer-to-peer computing. Peer-to-peer (P2P) system model is a kind of distributed OS. In this model, clients and servers aren't distinguished from one anot

What is the use of system programs, Q. What is the use of system programs? ...

Q. What is the use of system programs? Answer: System programs are able to be thought of as bundles of useful system calls. They provide fundamental functionality to users so

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

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