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 !

Cpu, Some CPUs provide for more than two modes of operation. What are two p...

Some CPUs provide for more than two modes of operation. What are two possible uses of these multiple modes?

What is paging? name the different paging techniques, What is paging? Name ...

What is paging? Name the different paging techniques. Paging is a memory management method that permits the physical-address space of a process to be noncontiguous. Paging evad

Define shell in unix system, A Unix shell is a shell or command-line inte...

A Unix shell is a shell or command-line interpreter that gives a traditional user interface for the Unix-likesystems and for Unix operating system. Users operates the operation of

General graph directory system in shell sort, we need an information about ...

we need an information about the different graph directory systems in detail by using shell sort . we also application part of directory systems in practical life. please help us i

Threads, What is single and multithreading and thread pool?

What is single and multithreading and thread pool?

Major page fault, Major page fault: If the page is not loaded in memory a...

Major page fault: If the page is not loaded in memory at the time the fault is stated, then it is named major or hard page fault. The handler in the machine requires to search a

Describes responsibilities of the I/O manager, Q. Describes responsibilitie...

Q. Describes responsibilities of the I/O manager? Answer: The I/O manager is responsible for file systems and device drivers and network drivers. The I/O manager keeps follow

Why interrupt can be used, Why interrupt can be used? The majority of t...

Why interrupt can be used? The majority of the different parts of the PC need to send information to and from the processor and they expect to be able to get the processor's at

Merits of device controller in the kernel, Q. State three merits of placing...

Q. State three merits of placing functionality in a device controller rather than in the kernel and State three disadvantages. Answer: Three advantages: Bugs are less probabl

What is preallocation, What is preallocation? Why do it? Allocating spa...

What is preallocation? Why do it? Allocating space for a file before making the file to allow for expansion. This reserves space for a certain file so that other files can't gr

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