#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/sem.h>
#include <sys/stat.h>
int main( int argc,char** argv )
{
 int nsems,semflag,semid;
 key_t key;
if( argc>1 )
{
 sscanf( argv[1],"%d",&nsems )
if( nsems>0 )
{
key = ftok( "/tmp",'a'+'t'+'h'+'r'+'i'+'r' );
printf( "[pid=%u] tworzy zbiór %d semaforów [key=%x]\n",
(unsigned)getpid(),nsems,(unsigned)key );
semflag = IPC_CREAT | S_IRUSR | S_IWUSR;
semid = semget( key,nsems,semflag );
if( semid==-1 ){ perror( "\tsemget()..." ); exit( 3 ); }
else
{
if( semctl( semid,0x0,IPC_RMID) == -1)
{ perror("\tsemctl()"); exit(1); }
}
}
else
  { printf( "\t%s [%s]\n%s",argv[0],"n",
"\tn -rozmiar tworzonej tablicy semaforów\n" ); exit( 1 ); }
return 0;
}}