Programiranje v C v Linux oz. Unix

#include stdio.h
#include stdlib.h
#include unistd.h

void main(argc,argv) 
int argc; 
char *argv[]; 
{ 
int pid_sina; 
int a; 
int *b; 
FILE *fd; 
char znak; 

a=5; 
b = (int *) malloc(sizeof(int)); 
*b = 8; 

fd = fopen("prvi.c","r"); 
fscanf(fd,"%c ",&znak); 
printf("Znak = %c \n",znak); 
printf("Moj pid = %i \n", getpid()); 

if ((pid_sina=fork())==0){ /* sin */
*b = 30; 

fscanf(fd,"%c ",&znak); 

printf("Moj PID = %i. A = %i B = %i Znak = %c \n", getpid(),a, *b, znak); 
}
else { /* oce */ 
/* sleep(5); */ 
a=9; 
fscanf(fd,"%c ",&znak); 
printf("Moj PID = %i. A = %i B = %i Znak = %c \n", getpid(),a, *b, znak); 
} 
}

2.primer

#include stdio.h
#include stdlib.h
#include unistd.h
#include time.h 

#include sys/types.h
#include sys/ipc.h
#include sys/shm.h
#include sys/sem.h

void W(id)
int id; 
{
struct sembuf sops;

sops.sem_num=0;
sops.sem_op=-1;
sops.sem_flg=0;

if (semop (id,&sops,1)==-1) printf("Napaka v WAIT!\n");
} 

void S(id)
int id;
{
struct sembuf sops;

sops.sem_num=0;
sops.sem_op=1;
sops.sem_flg=0;

if(semop (id,&sops,1)==-1) printf("Napaka v SIGNAL!\n");
} 

void SetVal(id, value)
int id;
int value;
{
union semun arg;

arg.val=value;

semctl(id,0,SETVAL,arg);
}
void main(argc,argv)
int argc;
char *argv[];
{
int pid_sina;

int shmid;
struct shmid_ds buf;
int *a;

int semid; 
time_t t; 

/* Skupen pomnilnik */
shmid = shmget (IPC_PRIVATE, 10*sizeof(int), 0600); 
a = (int *) shmat (shmid, (char *) 0, 0600); 

/* Semafor */
semid = semget (IPC_PRIVATE, 1, 0600); 

/* Nastavi semafor */ 
SetVal(semid,1);

time(&t);
srand((unsigned int) t); 

a[0]=1; a[1]=4; a[5]=23;

if ((pid_sina=fork())==0) { /* sinov del -- consumer */
int k; 

printf("Sinov del. PID = %i \n",getpid());

while (a[0]) { 
W(semid); 
for (k=0; k < 10; k++)
printf(" %i",a[k]);
//sleep(0.01); 
S(semid);

printf("\n");
}

exit(1);
}

/* oce producer */
printf("Ocetov del. PID = %i \n", getpid());

while (a[0]) {
float rnd;
int nst;

rnd = (float) rand()/((float) RAND_MAX);

nst=(int) (rnd*10.0);

W(semid);
printf("Nov num = %i \n", nst);
a[0]=nst;
S(semid);
sleep(0.2);
}

wait(0);
/* pocisti */ 
shmctl (shmid, IPC_RMID, &buf);
semctl (semid, 0, IPC_RMID,0); 
}