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 !

Performance of job scheduling strategies, Performance of Job Scheduling  St...

Performance of Job Scheduling  Strategies In this project you will investigate the performance of Job Scheduling strategies, Memory Allocation strategies and a CPU Scheduling s

Advanced synchronization in operating system, Recall that condition variabl...

Recall that condition variables are synchronization primitives that enable threads to wait until a particular condition occurs. Generalizing, the combination of locks and condit

Definition of operating system, Q. Definition of Operating System? Defi...

Q. Definition of Operating System? Definition of Operating System: • An Operating system is a program which controls execution of application programs and acts as an interfa

Define the turn-around time of a user job, Define the “turn-around” time of...

Define the “turn-around” time of a user job Turn- around time is total time taken to execute the job.

Determine what the blocking factor of a file is, Determine what the “blocki...

Determine what the “blocking factor” of a file is Blocking factor is the number of logical records in one physical record

List operations to be performed on directories, List operations to be perfo...

List operations to be performed on directories. Search for a file, delete a file, create a file, list a directory, rename a file, and traverse the file system.

Explain the communications of request or response interface, Explain the Co...

Explain the Communications of Request or Response Interface The inter-application communication must provide four specific interface to the CSInterface() components. A client m

Describe the buddy system of memory allocation, Buddy system of memory allo...

Buddy system of memory allocation Free memory is used to maintain in linked lists, each of similar sized blocks. Every block is of size 2^k. When some memory is needed by a th

Peripharal device, 50 peripharal device name ,diagram and uses

50 peripharal device name ,diagram and uses

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