tag	line	file	source code
sys_waitpid	20	include/linux/sys.h	extern int sys_waitpid();
sys_waitpid	117	kernel/sched.c	sys_write, sys_open, sys_close, sys_waitpid, sys_creat, sys_link,
sys_waitpid	207	kernel/signal.c	asmlinkage int sys_waitpid(pid_t pid,unsigned long * stat_addr, int options);
sys_waitpid	336	kernel/signal.c	while (sys_waitpid(-1,NULL,WNOHANG) > 0)