fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing The only 100% safe way to pass a NULL pointer as a function argument in K&R C is to cast 0 to a pointer type; failing to do so may cause mysterious bugs (invalid stack frames or garbage in argument registers) on 64-bit machines. This issue has already been fixed in most of FC host tools, but I just found some missed spots: passing of NULL UDH to PDU encoding functions in fcup-smsend[mult] in the case of single (not concatenated) SMS.

/*
 * This module contains the set_serial_nonblock() function.
 */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <unistd.h>

extern int target_fd;

set_serial_nonblock(state)
	int state;
{
	ioctl(target_fd, FIONBIO, &state);
}