sys_getppid      1414 arch/alpha/kernel/osf_sys.c 	current_pt_regs()->r20 = sys_getppid();
sys_getppid       142 arch/arm64/include/asm/unistd32.h __SYSCALL(__NR_getppid, sys_getppid)
sys_getppid       744 include/linux/syscalls.h asmlinkage long sys_getppid(void);
sys_getppid       524 include/uapi/asm-generic/unistd.h __SYSCALL(__NR_getppid, sys_getppid)
sys_getppid       524 tools/include/uapi/asm-generic/unistd.h __SYSCALL(__NR_getppid, sys_getppid)