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

Explain the grouping threads that execute similar functions, Grouping Threa...

Grouping Threads That Execute Similar Functions Thread Groups are generally used to group threads that execute similar functions of the application program. For instance, if

Explain about operating system services, Q. Explain about Operating System ...

Q. Explain about Operating System Services? An operating system offers services to programs and to users of those programs. It provided by one environment for execution of

Determine the reasons for poor response time, Determine the reasons for Poo...

Determine the reasons for Poor response time Process busy or High I/O rates or High paging rates

Monolithic operating system structure, advantages and disadvantages

advantages and disadvantages

What are the necessary conditions for deadlocks?, What are the necessary co...

What are the necessary conditions for deadlocks? 1. Mutual exclusion : Only one process at a time is able to use the resource. 2. Hold and wait : A process should be holdi

Explain about time sharing systems, Q. Explain about Time Sharing Systems? ...

Q. Explain about Time Sharing Systems? Time Sharing Systems Multi-programmed batched systems provide an environment where various system resources (for illustration CP

Paging, Paging full question

Paging full question

How can an index file be used to speed up, How can an index file be used to...

How can an index file be used to speed up the access in direct-access files? Have an index in memory; the index gives the key and the disk location of its corresponding record.

What are the functions of virtual file system (vfs), What are the functions...

What are the functions of virtual file system (VFS)? a. It separates file-system-generic operations from their execution defining a clean VFS interface. It permits transparent

Catalogue the design goals of windows xp, Q. Catalogue the design goals of ...

Q. Catalogue the design goals of Windows XP. Answer: Design goals comprise security and reliability and Windows and POSIX application compatibility with high performance and ex

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