System fork example

Simple example to fork child process and make it to do some work.

Compilation

Easiest way to get this example running is to go to examples directory in package root, and run:

$ ./build.sh sys_fork

build.sh script compiles Ano script to C, copies source files in place and pops up instructions what to do next. Follow them. Check also examples/README for more info.

Preview

; ------------------------------------------------------------------------------
; sys_fork.ano
;
; To compile:
;
; $ ./build/ano ./examples/sys_fork/sys_fork.ano > \
;     engine/dsl_ano.h
; ------------------------------------------------------------------------------
;
; @ANO_SCRIPT_NAME		sys_fork
; @ANO_SCRIPT_VERSION		0.0.1
; @ANO_SCRIPT_DESCRIPTION	Simple forking example
;
; @ANO_FLAGS_USE_PROTOS		[ ]
; @ANO_FLAGS_VAR_NAME_SUBS	[ ]
; @ANO_FLAGS_VAR_WARN_UNUSED	[ ]
;
; Copyright © 2016-2026, Jani Salonen <salojan@goto10.co>
; All rights reserved.
;
; Example to fork child process and make it to do some work.
;

main [exit: 0] {
	; Fork child process.
	;
	fork
	mov	_pid (rc)

	; Parent process exits immediately…
	;
	cmp	_pid (0)
	jne	"parent"

	; …and child process does all the work.
	;
	mov	_cmd ("uname")

	exec (_cmd, "-o", "-p", "-m", "-r")

	system ("hostname")

parent:

}

; ------------------------------------------------------------------------------
; sys_fork.w2c
;
; To compile:
;
; $ ./build/widget ./examples/sys_fork/sys_fork.w2c > \
;     engine/widget_defs.h
; ------------------------------------------------------------------------------

; ------------------------------------------------------------------------------
; sys_fork.m2c
;
; To compile:
;
; $ ./build/menu ./examples/sys_fork/sys_fork.m2c > \
;     engine/menu_defs.h
; ------------------------------------------------------------------------------