kernel-features.h

linux下的C语言库源码有一百多M解压后很不错

# define __ASSUME_NEW_PRCTL_SYSCALL		1
#endif

/* Starting with 2.4.21 the PowerPC32 clone syscall works as expected.  */
#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \
    && !defined __powerpc64__
# define __ASSUME_FIXED_CLONE_SYSCALL		1
#endif

/* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
   The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
   to be used in the set/swapcontext implementation.  */
#if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
# define __ASSUME_NEW_RT_SIGRETURN_SYSCALL		1
#endif

/* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
   semantics was changed in 2.5.30, and again after 2.5.31.  */
#if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
# define __ASSUME_SET_THREAD_AREA_SYSCALL	1
#endif

/* The vfork syscall on x86 and arm was definitely available in 2.4.  */
#if __LINUX_KERNEL_VERSION >= 132097 && defined __i386__
# define __ASSUME_VFORK_SYSCALL		1
#endif

/* Alpha switched to a 64-bit timeval sometime before 2.2.0.  */
#if __LINUX_KERNEL_VERSION >= 131584 && defined __alpha__
# define __ASSUME_TIMEVAL64		1
#endif

/* The late 2.5 kernels saw a lot of new CLONE_* flags.  Summarize
   their availability with one define.  The changes were made first
   for i386 and the have to be done separately for the other archs.
   For i386 we pick 2.5.50 as the first version with support.
   For ia64, s390*, PPC, x86-64, and SH we pick 2.5.64 as the first
   version with support.  */
#if ((__LINUX_KERNEL_VERSION >= 132402 && defined __i386__)		\
     || (__LINUX_KERNEL_VERSION >= 132416				\
	 && (defined __ia64__ || defined __s390__			\
	     || defined __powerpc__ || defined __x86_64__ || defined __sh__)))
# define __ASSUME_CLONE_THREAD_FLAGS	1
#endif

/* Beginning with 2.5.63 support for realtime and monotonic clocks and
   timers based on them is available.  */
#if __LINUX_KERNEL_VERSION >= 132415
# define __ASSUME_POSIX_TIMERS		1
#endif

/* Beginning with 2.6.12 the clock and timer supports CPU clocks.  */
#if __LINUX_KERNEL_VERSION >= 0x2060c
# define __ASSUME_POSIX_CPU_TIMERS	1
#endif

/* With kernel 2.4.17 we always have netlink support.  */
#if __LINUX_KERNEL_VERSION >= (132096+17)
# define __ASSUME_NETLINK_SUPPORT	1
#endif

/* The requeue futex functionality was introduced in 2.5.70.  */
#if __LINUX_KERNEL_VERSION >= 132422
# define __ASSUME_FUTEX_REQUEUE	1
#endif

/* The statfs64 syscalls are available in 2.5.74.  */
#if __LINUX_KERNEL_VERSION >= 132426
# define __ASSUME_STATFS64	1
#endif

/* Starting with at least 2.5.74 the kernel passes the setuid-like exec
   flag unconditionally up to the child.  */
#if __LINUX_KERNEL_VERSION >= 132426
# define __ASSUME_AT_SECURE	1
#endif

/* Starting with the 2.5.75 kernel the kernel fills in the correct value
   in the si_pid field passed as part of the siginfo_t struct to signal
   handlers.  */
#if __LINUX_KERNEL_VERSION >= 132427
# define __ASSUME_CORRECT_SI_PID	1
#endif

/* The tgkill syscall was instroduced for i386 in 2.5.75.  For Alpha
   it was introduced in 2.6.0-test1 which unfortunately cannot be
   distinguished from 2.6.0.  On x86-64, ppc, and ppc64 it was
   introduced in 2.6.0-test3. */
#if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \
    || (__LINUX_KERNEL_VERSION >= 132609 && defined __alpha__) \
    || (__LINUX_KERNEL_VERSION >= 132609 && defined __x86_64__) \
    || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
    || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
# define __ASSUME_TGKILL	1
#endif

/* The utimes syscall has been available for some architectures
   forever.  For x86 it was introduced after 2.5.75, for x86-64,
   ppc, and ppc64 it was introduced in 2.6.0-test3.  */
#if defined __alpha__ || defined __ia64__ \
    || defined __sparc__ \
    || (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \
    || (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__) \
    || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
    || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
# define __ASSUME_UTIMES	1
#endif

// XXX Disabled for now since the semantics we want is not achieved.
#if 0
/* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series.  */
#if __LINUX_KERNEL_VERSION >= 132609
# define __ASSUME_CLONE_STOPPED	1
#endif
#endif

/* The fixed version of the posix_fadvise64 syscall appeared in
   2.6.0-test3.  At least for x86.  Powerpc support appeared in
   2.6.2, but for 32-bit userspace only.  */
#if (__LINUX_KERNEL_VERSION >= 132609 && defined __i386__) \
    || (__LINUX_KERNEL_VERSION >= 132610 && defined __powerpc__ \
       && !defined __powerpc64__)
# define __ASSUME_FADVISE64_64_SYSCALL	1
#endif

/* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test
   series.  */
#if __LINUX_KERNEL_VERSION >= 132609
# define __ASSUME_PROT_GROWSUPDOWN	1
#endif

/* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
   SIMD (AKA Altivec, VMX) instructions and register state.  This changes
   the overall size of the sigcontext and adds the swapcontext syscall.  */
#if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__
# define __ASSUME_SWAPCONTEXT_SYSCALL	1
#endif

/* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is
   implied.  */
#if __LINUX_KERNEL_VERSION >= 132610
# define __ASSUME_NO_CLONE_DETACHED	1
#endif

/* Starting with version 2.6.4-rc1 the getdents syscall returns d_type
   information as well and in between 2.6.5 and 2.6.8 most compat wrappers
   were fixed too.  Except s390{,x} which was fixed in 2.6.11.  */
#if (__LINUX_KERNEL_VERSION >= 0x020608 && !defined __s390__) \
    || (__LINUX_KERNEL_VERSION >= 0x02060b && defined __s390__)
# define __ASSUME_GETDENTS32_D_TYPE	1
#endif

/* Starting with version 2.5.3, the initial location returned by `brk'
   after exec is always rounded up to the next page.  */
#if __LINUX_KERNEL_VERSION >= 132355
# define __ASSUME_BRK_PAGE_ROUNDED	1
#endif

/* Starting with version 2.6.9, the waitid system call is available.
   Except for powerpc{,64} and s390{,x}, where it is available in 2.6.12.  */
#if (__LINUX_KERNEL_VERSION >= 0x020609 \
     && !defined __powerpc__ && !defined __s390__) \
    || (__LINUX_KERNEL_VERSION >= 0x02060c \
	&& (defined __powerpc__ || defined __s390__))
# define __ASSUME_WAITID_SYSCALL	1
#endif

/* Starting with version 2.6.9, SSI_IEEE_RAISE_EXCEPTION exists.  */
#if __LINUX_KERNEL_VERSION >= 0x020609 && defined __alpha__
#define __ASSUME_IEEE_RAISE_EXCEPTION	1
#endif

/* On sparc64 stat64/lstat64/fstat64 syscalls were introduced in 2.6.12.  */
#if __LINUX_KERNEL_VERSION >= 0x02060c && defined __sparc__ \
    && defined __arch64__
# define __ASSUME_STAT64_SYSCALL	1
#endif

/* Early kernel used "shm" as the filesystem name for the filesystem used
   for shm_open etc.  Later it is "tmpfs".  2.4.20 is a safe bet for the
   cutover.  */
#if __LINUX_KERNEL_VERSION >= 0x02041a
# define __ASSUME_TMPFS_NAME	1
#endif

/* pselect/ppoll were introduced just after 2.6.16-rc1.  Due to the way
   the kernel versions are advertised we can only rely on 2.6.17 to have
   the code.  On x86_64 and SH this appeared first in 2.6.19-rc1,
   on ia64 in 2.6.22-rc1 and on alpha just after 2.6.22-rc1.  */
#if __LINUX_KERNEL_VERSION >= 0x020611 \
    && ((!defined __x86_64__ && !defined __sh__ && !defined __ia64__ \
	 && !defined __alpha__) \
	|| (__LINUX_KERNEL_VERSION >= 0x020613 \
	    && (defined __x86_64__ || defined __sh__)) \
	|| (__LINUX_KERNEL_VERSION >= 0x020616 && defined __ia64__) \
	|| (__LINUX_KERNEL_VERSION >= 0x020617 && defined __alpha__))
# define __ASSUME_PSELECT	1
# define __ASSUME_PPOLL		1
#endif

/* The *at syscalls were introduced just after 2.6.16-rc1.  Due to the way the
   kernel versions are advertised we can only rely on 2.6.17 to have
   the code.  On PPC they were introduced in 2.6.17-rc1, on SH in 2.6.19-rc1
   and on Alpha just after 2.6.22-rc1.  */
#if __LINUX_KERNEL_VERSION >= 0x020611 \
    && ((!defined __sh__ && !defined __alpha__) \
	|| (__LINUX_KERNEL_VERSION >= 0x020613 && defined __sh__) \
	|| (__LINUX_KERNEL_VERSION >= 0x020617 && defined __alpha__))
# define __ASSUME_ATFCTS	1
#endif

/* Support for inter-process robust mutexes was added in 2.6.17.  */
#if __LINUX_KERNEL_VERSION >= 0x020611 \
    && ((!defined __sh__ && !defined __alpha__) \
	|| (__LINUX_KERNEL_VERSION >= 0x020613 && defined __sh__) \
	|| (__LINUX_KERNEL_VERSION >= 0x020617 && defined __alpha__))
# define __ASSUME_SET_ROBUST_LIST	1
#endif

/* Support for PI futexes was added in 2.6.18.  */
#if __LINUX_KERNEL_VERSION >= 0x020612
# define __ASSUME_FUTEX_LOCK_PI	1
#endif

/* Support for utimensat syscall was added in 2.6.22, on alpha and s390
   only after 2.6.22-rc1.  */
#if __LINUX_KERNEL_VERSION >= 0x020616 \
    && ((!defined __sh__ && !defined __alpha__) \
	|| __LINUX_KERNEL_VERSION >= 0x020617)
# define __ASSUME_UTIMENSAT	1
#endif

/* Support for private futexes was added in 2.6.22.  */
#if __LINUX_KERNEL_VERSION >= 0x020616
# define __ASSUME_PRIVATE_FUTEX	1
#endif

/* Support for fallocate was added in 2.6.23, on s390
   only after 2.6.23-rc1.  */
#if __LINUX_KERNEL_VERSION >= 0x020617 \
    && ((!defined __s390__ && !defined __alpha__) \
	|| (__LINUX_KERNEL_VERSION >= 0x020618 && defined __s390__))
# define __ASSUME_FALLOCATE	1
#endif