main.c

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#include <stdio.h>
#include <fcntl.h>
#include <pthread.h>
#include <linux/net.h>         /* struct msghdr */
#include <errormsg.h>

static const char *filename = "/etc/ieee_802_addr";

/*
char *buf = "abcdefghijklm";
static char buf[] = "abcdefghijkl";
*/
char buf[13];

static int
test_select( int argc, char *argv[] )
{
   int failed = FALSE, count = 3, ret, nfds;
   fd_set testfds, *readfds = NULL, *writefds = NULL, *exceptfds = NULL;
   struct timeval delay = { 0, 0 };
   struct timeval no_delay = { 0, 0 };

   /*
    * Pass an invalid argument for the first argument.
    */
   nfds = -1;
   ret = select( nfds, &testfds, writefds, exceptfds, &delay );
   if( ret != -1 && errno != 22 )
   {
       fprintf( stderr, "select() test failed!\n");
       failed = TRUE;
   }

   nfds = 0;
   while( count-- > 0 )
   {
       delay.tv_sec = count;
       ret = select( nfds, readfds, writefds, exceptfds, &delay );
       if( ret < 0 )
       {
           perror("select() failed!");
           exit(1);
       }

       if( delay.tv_sec != 0 )
       {
            fprintf( stderr, "select() test failed!\n");
            failed = TRUE;
       }
   }
   
   ret = select( nfds, readfds, writefds, exceptfds, &no_delay );
   if( ret < 0 )
   {
        perror("select() failed!");
        exit(1);
   }
   
   return( failed );
}

static int
test_read( int argc, char *argv[] )
{
   int failed = FALSE, fd, nbytes;


   fd = open( filename, O_RDONLY );
   if( fd < 0 )
   {
       perror("open() failed!");
       exit(1);
   }

   /*
    * Test test file has 12 characters in it.
    */
   nbytes = read( fd, buf, 12 );
   if( nbytes < 0 )
   {
       return( TRUE );
       fprintf( stderr, "read() test failed!\n");
   }

   if( nbytes != 12)
   {
       close(fd);
       fprintf( stderr, "read %d bytes, not 12!\n", nbytes );
       return( TRUE );
   }

   /*
    * Attempt to write to the file.  Should fail with errno = EBADF
    * (file not open for writing).
    */
   nbytes = write( fd, buf, 12 );
   if( nbytes != -1 && errno != 9 )
   {
       close(fd);
       fprintf( stderr, "write() test failed!\n");
       failed = TRUE;
   }

   close(fd);
   return( failed );
}

int
main( int argc, char *argv[] )
{
   int fd = 1;
   struct msghdr msg;

   if( test_select( argc, argv ))
       printf("select() failed!\n");
   else
       printf("select() passed!\n");

   if( test_read( argc, argv ))
       printf("read-write() failed!\n");
   else
       printf("read-write() passed!\n");

    if( sendmsg( fd, &msg, 0 ) < 0 )
        perror("sendmsg()");

    if( recvmsg( fd, &msg, 0 ) < 0 )
        perror("recvmsg()");

   return(0);
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.