.text
usage:		.string "try to write : ./main test \n"
err_fork:	.string "fork"
some_text:	.string "%s qwertyuiop asdfghjkl zxcvbnm \n"
file_cat:	.string "/bin/cat"
cat_arg0:	.string "cat"
err_execv:	.string "execv"
wait_text:	.string "wait"

.globl main

.text
main:

#	0(%ebp)	int ebp
#	4(%ebp) ret
#	8(%ebp) int argc
#	12(%ebp) char** argv

	pushl	%ebp
	movl	%esp, %ebp

	#check argc
	cmp	$2, 8(%ebp)
	jge	argc_ok


	movl	12(%ebp), %ebx
	pushl	$usage
	call	printf
	addl	$8, %esp

	#exit
	jmp	exit_fail

argc_ok:
	#fork
	call	fork
	testl	%eax, %eax	#sravnivaem eax s nulem, esli eax<0, to "-"
				#esli eax = 0 to zero flag ustanovitsya
				#Intel Optimization Manual
	
	jns	fork_success
	
	#perror
	pushl	$err_fork
	call	perror		#ob"yasnyet kodi oshibok
	addl	$4, %esp

	jmp	exit_fail

fork_success:
	jnz	parent

	movl    8(%ebp), %eax
        shl     $4, %eax
        pushl   %eax
        pushl   12(%ebp)
        pushl   %ebp
        call    memcpy
        addl    $12, %esp

	
	#child process

	#execv(file_cat, argv)
	movl	$cat_arg0, (%eax)
	
	pushl	%eax
	pushl	$file_cat
	call	execv		#zamenyaet process programmoi iz file
				#zamenyetsya cat
	addl	$8, %esp

	#perror
	pushl	err_execv
	call	perror
	addl	$4, %esp

	#exit
	pushl	$1
	call	exit

parent:
	#parent process

	pushl	$0
	call	wait
	addl	$4, %esp

	testl	%eax, %eax
	js	wait_err

	#roditel dolzhen vizvat printf(3) i raspechatat kakoi libo text
	pushl	$some_text
	call	printf
	addl	$4, %esp
	
	#exit
	pushl	$0
	call	exit

wait_err:
	pushl	$wait_text
	call	perror
	addl	$4, %esp
	pushl	$1
	call	exit

exit_fail:
	#exit
	pushl	$1
	call	exit