/*************************************************
 * Lock a segment of shared memory.
 *
 * Please see the source of shmgrab.c for more info
 *
 *
 *
 * Copyright Yves Dorfsman 1999.
 *************************************************/



/*** #define _INCLUDE_HPUX_SOURCE  ***/

#include <stdio.h>
#include <stdarg.h>
#include <sys/ipc.h>
#include <errno.h>
#include <string.h>
#include <strings.h>
#include <sys/shm.h>





void usage(char*);




main(int argc, char** argv)
{
int    shm_id;


if (argc != 2)
  {
  usage(argv[0]);
  return -1;
  }


shm_id = atoi(argv[1]);
printf("Locking the shared memory segment with ID: %d\n", shm_id);
/** SHM_LOCK = 3, don't know why the include of shm.h doesn't work **/
/** The above line is for HPUX **/
if ( shmctl(shm_id, SHM_LOCK, 0) != 0)
  {
  perror(argv[0]);
  return errno;
  }
else
  {
  printf("Shared memory ID = %d now locked.\n", shm_id);
  printf("Please remember to release it with \'ipcrm -m ID\'.\n\n");
  }

return 0;
}








void usage(char* progname)
{
fprintf(stderr, "\n\t%s:\tSyntax error.\n", progname);
fprintf(stderr, "\n\tUsage:\t%s ID\n\n", progname);
fprintf(stderr, "\tID is a shared memory segment ID.\n\n", progname);
}