Example

#include <sys/types.h>

fd_set rmask;

int fd; /* a socket or file descriptor */

FD_ZERO( &rmask );

FD_SET( fd, &rmask ); FD_SET( fileno(stdin), &rmask );

for(;;) {

select( fd+1, &rmask, NULL, NULL, NULL );

if( FD_ISSET( fileno(stdin, &rmask ) )

/* read from stdin */

if( FD_ISSET( fd, &rmask ) )

/* read from descriptor fd */

FD_SET( fd, &rmask); FD_SET( fileno(stdin), &rmask );

}

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