view libpwon/forkoff.c @ 737:6d97866bad79

first round of documentation for DUART28C boot control addition
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 16 Sep 2020 06:10:39 +0000
parents 7d1df6d831e4
children ab54957dbe35
line wrap: on
line source

#include <sys/types.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

extern char bootctrl_pwon_cmd[];
extern int bootctrl_duart28c_mode;

static char shell_pathname[] = "/bin/sh";

void
fork_exec_pwon_cmd()
{
	int i;

	i = vfork();
	if (i < 0) {
		perror("vfork");
		exit(1);
	}
	if (i)
		return;
	execl(shell_pathname, "sh", "-c", bootctrl_pwon_cmd, (char *) 0);
	perror(shell_pathname);
	_exit(1);
}

pwon_if_needed()
{
	if (bootctrl_duart28c_mode) {
		signal(SIGCHLD, SIG_IGN);
		fork_duart28c_pulse();
		return(1);
	}
	if (bootctrl_pwon_cmd[0]) {
		signal(SIGCHLD, SIG_IGN);
		fork_exec_pwon_cmd();
		return(1);
	}
	return(0);
}