aio_read gives ENOSYS

[Joe Albowicz]

Hi,

I'm trying to write a sample program to use aio. However, I'm getting
back "function not implemented."  I *know* I must be doing something
stupid, but I can't seem to find info on the web.  Help!  

My code (that works on a Sun box) is below.  The only difference was
"-lrt" on Sun.  Note that I'm using "4.2-STABLE" and the io in
question is for a scsi disk.  Thanks in advance!

Joe

*******



#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>


#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>

#include <time.h>
#include <aio.h>
#include <errno.h>
#include <string.h>



void create_file();


void aio_handler(int signo, siginfo_t * info,
                 void * data)
{
  printf("aio_handler!!!\n");
}


int main(int argc, char * argv[])
{
  int ret_val;
  
  //create_file();
  aiocb iocb;

  struct sigaction sa;
  
  sa.sa_flags = SA_SIGINFO;
  sigemptyset(&sa.sa_mask);
  sa.sa_sigaction = aio_handler;
  
  sigaction(SIGUSR1, &sa, NULL);

  int buff[1000];
  
  int fh = open("test_file", O_RDONLY);
  assert(fh > 0);


  printf("Setting up aio_read()\n");
    
  iocb.aio_fildes = fh;
  iocb.aio_offset = 0;
  iocb.aio_buf = &buff[0];
  iocb.aio_nbytes = sizeof(int) * 400;
  iocb.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
  iocb.aio_sigevent.sigev_signo  = SIGUSR1;
  
  ret_val = aio_read(&iocb);
  printf("aio_read() == %d\n", ret_val);
  
  if(ret_val == -1)
    printf("Error:   %s\n", strerror(errno));
  
  sleep(10);
  
  close(fh);
}

void create_file()
{
  int result;

  system("rm -f test_file");
  
  int fh = open("test_file", O_CREAT | O_WRONLY,
                S_IRUSR | S_IWUSR | S_IROTH);
  assert(fh != -1);

  for(int i = 0; i < 10 * 4096; i++)
  {
    result = write(fh, &i, sizeof(i));
    assert(result != -1);
  }

  close(fh);
}






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