Linux Kernel  3.7.1
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unistd.h
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2 
3 /*
4  * These are required system calls, we should
5  * invert the logic eventually and let them
6  * be selected by default.
7  */
8 #if __BITS_PER_LONG == 32
9 #define __ARCH_WANT_STAT64
10 #define __ARCH_WANT_SYS_LLSEEK
11 #endif
12 #define __ARCH_WANT_SYS_RT_SIGACTION
13 #define __ARCH_WANT_SYS_RT_SIGSUSPEND
14 #define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
15 
16 /*
17  * "Conditional" syscalls
18  *
19  * What we want is __attribute__((weak,alias("sys_ni_syscall"))),
20  * but it doesn't work on all toolchains, so we just do it by hand
21  */
22 #ifndef cond_syscall
23 #define cond_syscall(x) asm(".weak\t" #x "\n\t.set\t" #x ",sys_ni_syscall")
24 #endif