#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
int main()
{
pid_t pid;
for(int i=0;i<3;i++)
{
pid=fork();
switch(pid)
{
case -1:
{
perror(" Nie uwtorzono procesu potomnego. \n ");
exit(1);
}
case 0:
{
if(i==2) printf("gid= %d uid=%d pid=%d ppid=%d \n",getgid(),getuid(),getpid(),getppid());
break;
}
default:
{
if(i==2) printf("gid= %d uid=%d pid=%d ppid=%d \n",getgid(),getuid(),getpid(),getppid());
}
}
}
wait(NULL);
wait(NULL);
wait(NULL);
return 0;
}
#include<stdio.h>
#include<stdlib.h>
#include<signal.h>
#include<unistd.h>
#include<sys/types.h>
void sig(int num)
{
printf("numer sygnalu %d \n", num);
}
int main()
{
printf("pid = %d ppid = %d \n",getpid(),getppid());
if(signal(SIGUSR1,sig)==SIG_ERR)
{
perror(":");
exit(-1);
}
int a=fork();
switch(a)
{
case -1:
{
perror(":");
exit(-1);
}
case 0:
{
sleep(10);
kill(a,SIGUSR1);
printf("dziecko\n");
break;
}
default :
{
sleep(5);
kill(a,SIGUSR1);
printf("rodzic \n");
sleep(15);
kill(a,SIGUSR1);
printf("rodzic2 \n");
wait(NULL);
}
}
return 0;
}
#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<unistd.h>
#include<sys/wait.h>
int main()
{
int fd[2];
int x=0;
if(pipe(fd)>=0)
{
switch(fork())
{
case -1:
{
perror(":");
exit(-1);
}
case 0:
{
int k=0;
close(fd[1]);
int r=read(fd[0],&k,sizeof(k));
if(r!=-1)
{
printf("value =%d \n",k);
sleep(1);
}
else
{
perror(":");
exit(-1);
}
while(1)
{
r= read(fd[0],&k,sizeof(k));
if(r==0)
{
break;
}
printf("value =%d \n",k);
sleep(1);
}
close(fd[0]);
break;
}
default:
{
int b[4]={1,3,4,5};
close(fd[0]);
for(int i=0;i<4;i++)
{
if(write(fd[1],&b[i],sizeof(b)))
{
printf("write \n");
exit(-1);
}
close(fd[1]);
break;
}
wait(NULL);
}
}
}
else
{
perror(":");
exit(-1);
}
return 0;
}
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