sys_dup2          140 arch/arm64/include/asm/unistd32.h __SYSCALL(__NR_dup2, sys_dup2)
sys_dup2         1060 include/linux/syscalls.h asmlinkage long sys_dup2(unsigned int oldfd, unsigned int newfd);
sys_dup2         1858 tools/include/nolibc/nolibc.h 	int ret = sys_dup2(old, new);