#	;; sleep.s

#	try to illustrate how to work with the nanosleep system call
#
#
#   The man page for nanosleep gives the following specification for the arguments:
#
#              #include <time.h>
#
#       int nanosleep(const struct timespec *req, struct timespec *rem);
#
#
#
#       struct timespec {
#                  time_t tv_sec;        /* seconds */
#                  long   tv_nsec;       /* nanoseconds */
#              };
#
#
#   had to work a bit to find that both "time_t" and "long" are actually .quad, not .long !
#
#

#include <asm/unistd_64.h>	

	.file	"sleep.s"

	.data
time:
	.quad	5
	.quad	0
rem:
	.quad   0
	.quad	0
	
	.text
	.globl sleep

#  	first argument goes into %rdi  == pointer to time
#	second argument goes into %rsi == pointer to rem (short for remainder, if we are interrupted)

	
	
sleep:
	
	lea     time,%rdi		# 
	lea	rem,%rsi		# 
	mov     $__NR_nanosleep,%rax	# syscall is nanosleep, so 35 goes in %rax...
	syscall


	
	mov	$0, %rdi		# and exit with a zero status
	mov	$__NR_exit, %rax	# syscall = 60 is exit
	syscall