hello all
i tried to run this code on fedora machine. but it
gives me the error. when it calls write function with
portname=/dev/parport0
Write failed with: Invalid argument
and the following error when portname=/dev/lp0
Write failed with: Resource temporarily unavailable
what is the reason for that. i have ECP configuration
for the port in my BIOS.
is there any problem with some coniguration or
driver??
please help
thanks in advance
#include <time.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <termios.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/signal.h>
#include <linux/lp.h>
extern int errno;
int main( int argc, char **argv )
{
char *filename, input[5];
int fd;
errno = 0;
if( argc < 2 ) {
printf("Usage: a.out /dev/portname\n");
exit(1);
}
printf("Trying to open %s\n", argv[1] );
fd = open( argv[1] , O_RDWR | O_NONBLOCK );
if( fd < 0 ) {
fprintf( stderr, "Open failed with: " );
goto fail;
}
if ( write( fd, "hello\n", sizeof( "hello\n" ) ) < 0
) {
fprintf( stderr, "Write failed with: " );
goto fail;
}
if ( read( fd, input, 5 ) < 0 ) {
fprintf( stderr, "Write failed with: " );
goto fail;
}
close( fd );
exit(0);
fail:
fprintf( stderr, strerror( errno ) );
fprintf( stderr, "\n" );
close( fd );
exit(1);
}
=====
Arundeep Singh,
M.Tech (IS), IIIT Allahabad,
U.P, India.
ph: 09415262466, 09417066713
http://www.i-cognition.com
Don't take life seriously, as you can't come out of it alive.
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