#include <syscall.h>
#include <lsb_helpers.h>

// syscall can't have helprer due to variable number of arguments.  
// So we have to call it through pointer.
int syscall(int,...);
LSB_CHECKER(DEFAULT,syscall);
// now pointer syscall_a is available.

int syscall_gettid_available()
{
    return syscall_available() && (syscall_gettid() != -1);
}

#ifndef SYS_gettid
// i386: 224, ia64: 1105, amd64: 186, sparc 143
#ifdef __ia64__
#define SYS_gettid 1105
#elif __i386__
#define SYS_gettid 224
#elif __amd64__
#define SYS_gettid 186
#elif __sparc__
#define SYS_gettid 143
#else
#error define gettid for the arch
#endif
#endif

int syscall_gettid()
{
    //To load address we must check availability
    syscall_available();
    //now syscall
    return (*syscall_a)(SYS_gettid);
}