#ifndef PROCPS_PROC_PROCPS_H
#define PROCPS_PROC_PROCPS_H

#ifdef  __cplusplus
#define EXTERN_C_BEGIN extern "C" {
#define EXTERN_C_END }
#else
#define EXTERN_C_BEGIN
#define EXTERN_C_END
#endif

#if !defined(restrict) && __STDC_VERSION__ < 199901
#if __GNUC__ > 2 || __GNUC_MINOR__ >= 92    // maybe 92 or 95 ?
#define restrict __restrict__
#else
#warning No restrict keyword?
#define restrict
#endif
#endif

// marks old junk, to warn non-procps library users
#if ( __GNUC__ == 3 && __GNUC_MINOR__ > 0 ) || __GNUC__ > 3
#define OBSOLETE __attribute__((deprecated))
#else
#define OBSOLETE
#endif

// available when?
// Tells gcc that function is library-internal;
// so no need to do dynamic linking at run-time.
#if __GNUC__ > 2     // FIXME: total random guess that's sure to be wrong
#define VISIBILITY_HIDDEN visibility("hidden")
#else
#define VISIBILITY_HIDDEN
#endif
// mark function for internal use
#define HIDDEN __attribute__((VISIBILITY_HIDDEN))
// given foo, create a foo_direct for internal use
#define HIDDEN_ALIAS(x) extern __typeof(x) x##_direct __attribute__((alias(#x),VISIBILITY_HIDDEN))

// since gcc-2.5
#define NORETURN __attribute__((__noreturn__))
#define FUNCTION __attribute__((__const__))  // no access to global mem, even via ptr, and no side effect

#if __GNUC__ > 2 || __GNUC_MINOR__ >= 96
// won't alias anything, and aligned enough for anything
#define MALLOC __attribute__ ((__malloc__))
// no side effect, may read globals
#define PURE __attribute__ ((__pure__))
// tell gcc what to expect:   if(unlikely(err)) die(err);
#define likely(x)       __builtin_expect(!!(x),1)
#define unlikely(x)     __builtin_expect(!!(x),0)
#define expected(x,y)   __builtin_expect((x),(y))
#else
#define MALLOC
#define PURE
#define likely(x)       (x)
#define unlikely(x)     (x)
#define expected(x,y)   (x)
#endif

#endif