Get Syscalls numbers dynamically from header files

get_syscall_numbers.py

UNISTD_PATH = '/usr/include/x86_64-linux-gnu/asm/unistd_64.h'

def get_syscall_numbers(unistd_path=UNISTD_PATH):
    d = {}
    with open(unistd_path, 'r') as f:
        for line in f.readlines():
            if line.startswith('#define __NR_'):
                try:
                    syscall_data = line.strip().split()
                    d[syscall_data[1].replace('__NR_', '')] = int(syscall_data[2])
                except:
                    pass
    return d


SYSCALLS = get_syscall_numbers()

print SYSCALLS['perf_event_open']

# can be used with:
# import ctypes
# libc = ctypes.CDLL(None)
# syscall = libc.syscall
# syscal(SYSCALLS['perf_event_open'], ....)