Inter-process Communication !, Operating System

Assignment Help:
My code it didn''t run properly ,i tried to pass 2 parameter example : ./a.out ls -ll ,but it execute only the ls instead of the ls -ll !
plz help amd thank you !
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

int main(int argc ,char *argv[])
{
int i,pid;
int fd[2];//crea i descriptor
char phrase[30][30];//crea il buffer
pipe(fd); /* crea la pipe */

for(i = 0; i < argc - 1 ; i++)
{
if((pid=fork())==0)
{
strcpy(phrase[i], argv[i+1]);
printf("ho scritoo :''%s''\n",phrase[i]);
close(fd[0]); /* chiude in lettura */
write(fd[1],phrase[i],strlen(phrase[i])+1); /* invia anche 0x00 */
close (fd[1]); // chiude in scrittura
// pid=0 -> figlio
usleep(50000*(1+i)); // Ritardo iniziale
printf("Figlio: %d\n",i+1); // Stampa messaggio del figlio
usleep(500000*(1+i)); // Ritardo finale
// Termina con codice di ritorno
dup2(fd[1], STDOUT_FILENO); // redirigo stdout sulla write end della pipe
//execlp(phrase[i], phrase[i], NULL); // eseguo il comando specificato
execlp(phrase[i],phrase[i],NULL);
return(101+i);
} else {
printf("Ho generato il figlio %d con pid %d\n",i+1,pid);
char message[100]; //creare il buffer
memset(message,0,100);
int bytesread;

bytesread = read(fd[0],message,sizeof(message));
printf("ho letto dalla pipe %d bytes: ''%s'' \n",bytesread,message);
// close(fd[0]);
}
}
close(fd[0]); /* chiude in scrittura */
close(fd[1]); /* chiude in scrittura */
// Attende che dieci processi terminino
for(i=0;i {
int status;
wait(&status); // Attende termine di un figlio (uno qualunque)
printf("Terminato processo %d\n",WEXITSTATUS(status));
}
return 0;
}

Related Discussions:- Inter-process Communication !

Important system components, Organizational, Structural, Logical and Execut...

Organizational, Structural, Logical and Execution Relationships Between Important System Components in Linux Kernel Subsystems A. Description of the Project You are require

Long term scheduler, Long term scheduler calculates which processes are a...

Long term scheduler calculates which processes are admitted to the machine for processing. It accepts the degree of multiprogramming. Once accepted, a job converts a process.

Taxation problem, Smith, who is a civil engineer, purchased a 30-hectare bl...

Smith, who is a civil engineer, purchased a 30-hectare block of land in Australia in 1986 and used two hectares of it as a main residence. The part that was not main residence cost

Banker''s algorithm, Consider the following snapshot of a system, answer th...

Consider the following snapshot of a system, answer the following questions using the banker's algorithm: 1. What is the content of the matrix Need? Is the system in a safe stat

All the explanations of operating system and its types., operating systems ...

operating systems and its types together with its design issues and their examples.

How can the deadlock be prevented?, How can the deadlock be prevented? ...

How can the deadlock be prevented? To evade deadlocks first we will have to obtain the information about how resources are to be requested. And as well we should make sure that

Explain optimal page replacement, Optimal page replacement An optimal ...

Optimal page replacement An optimal page replacement algorithm has the least page fault rate of all algorithms. The algorithm states that a 'replace the page that will not be

What is the purpose of system calls, What is the purpose of system calls? ...

What is the purpose of system calls? System calls permit user-level processes to request services of the operating system.

In JavaScript, Ask quesIn JavaScript, what is event handling tion #Minimum ...

Ask quesIn JavaScript, what is event handling tion #Minimum 100 words accepted#

Define local procedure call, Q. What kinds of services does the process man...

Q. What kinds of services does the process manager provide? Define local procedure call? Answer: The process manager offers services for creating and deleting and using proce

Write Your Message!

Captcha
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!

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