sane-project-backends/include/sane/sanei_backend.h

#include <sane/sanei_debug.h>

#ifdef HAVE_SYS_HW_H
  /* OS/2 i/o-port access compatibility macros: */
# define inb(p)		_inp8 (p)
# define outb(v,p)	_outp8 ((p),(v))
# define ioperm(b,l,o)	_portaccess ((b),(b)+(l)-1)
# define HAVE_IOPERM	1
#endif

#ifndef O_NONBLOCK
# ifdef O_NDELAY
#  define O_NONBLOCK O_NDELAY
# else
#  define O_NONBLOCK FNDELAY	/* last resort */
# endif
#endif

#ifndef __GLIBC__
# ifndef u_int8_t
#  define u_int8_t	unsigned char
# endif
# ifndef u_int16_t
#  define u_int16_t	unsigned short
# endif
# ifndef u_int32_t
#  define u_int32_t	unsigned int
# endif
#endif

#ifdef HAVE_SIGPROCMASK
# define SIGACTION	sigaction
#else

/* Just enough backwards compatibility that we get by in the backends
   without making handstands.  */
# ifdef sigset_t
#  undef sigset_t
# endif
# ifdef sigemptyset
#  undef sigemptyset
# endif
# ifdef sigfillset
#  undef sigfillset
# endif
# ifdef sigaddset
#  undef sigaddset
# endif
# ifdef sigdelset
#  undef sigdelset
# endif
# ifdef sigprocmask
#  undef sigprocmask
# endif
# ifdef SIG_BLOCK
#  undef SIG_BLOCK
# endif
# ifdef SIG_UNBLOCK
#  undef SIG_UNBLOCK
# endif
# ifdef SIG_SETMASK
#  undef SIG_SETMASK
# endif

# define sigset_t		int
# define sigemptyset(set)	do { *(set) = 0; } while (0)
# define sigfillset(set)	do { *(set) = ~0; } while (0)
# define sigaddset(set,signal)	do { *(set) |= sigmask (signal); } while (0)
# define sigdelset(set,signal)	do { *(set) &= ~sigmask (signal); } while (0)
# define sigaction(sig,new,old)	sigvec (sig,new,old)

  /* Note: it's not safe to just declare our own "struct sigaction" since
     some systems (e.g., some versions of OpenStep) declare that structure,
     but do not implement sigprocmask().  Hard to believe, aint it?  */
# define SIGACTION		sigvec
# define SIG_BLOCK	1
# define SIG_UNBLOCK	2
# define SIG_SETMASK	3
#endif /* !HAVE_SIGPROCMASK */

/* Declare the entry points: */

extern SANE_Status ENTRY(init) (SANE_Int *, SANE_Auth_Callback);
extern SANE_Status ENTRY(get_devices) (const SANE_Device ***, SANE_Bool);
extern SANE_Status ENTRY(open) (SANE_String_Const, SANE_Handle *);
extern const SANE_Option_Descriptor *
  ENTRY(get_option_descriptor) (SANE_Handle, SANE_Int);
extern SANE_Status ENTRY(control_option) (SANE_Handle, SANE_Int, SANE_Action,
					  void *, SANE_Word *);
extern SANE_Status ENTRY(get_parameters) (SANE_Handle, SANE_Parameters *);
extern SANE_Status ENTRY(start) (SANE_Handle);
extern SANE_Status ENTRY(read) (SANE_Handle, SANE_Byte *, SANE_Int,
				SANE_Int *);
extern SANE_Status ENTRY(set_io_mode) (SANE_Handle, SANE_Bool);
extern SANE_Status ENTRY(get_select_fd) (SANE_Handle, SANE_Int *);
extern void ENTRY(cancel) (SANE_Handle);
extern void ENTRY(close) (SANE_Handle);
extern void ENTRY(exit) (void);

#ifndef STUBS
/* Now redirect sane_* calls to backend's functions: */

#define sane_init(a,b)			ENTRY(init) (a,b)
#define sane_get_devices(a,b)		ENTRY(get_devices) (a,b)
#define sane_open(a,b)			ENTRY(open) (a,b)
#define sane_get_option_descriptor(a,b)	ENTRY(get_option_descriptor) (a,b)
#define sane_control_option(a,b,c,d,e)	ENTRY(control_option) (a,b,c,d,e)
#define sane_get_parameters(a,b)	ENTRY(get_parameters) (a,b)
#define sane_start(a)			ENTRY(start) (a)
#define sane_read(a,b,c,d)		ENTRY(read) (a,b,c,d)
#define sane_set_io_mode(a,b)		ENTRY(set_io_mode) (a,b)
#define sane_get_select_fd(a,b)		ENTRY(get_select_fd) (a,b)
#define sane_cancel(a)			ENTRY(cancel) (a)
#define sane_close(a)			ENTRY(close) (a)
#define sane_exit(a)			ENTRY(exit) (a)
#endif /* STUBS */