source: bootcd/isolinux/syslinux-6.03/gpxe/src/arch/i386/interface/pcbios/keepsan.c

#include <stdint.h>
#include <stdio.h>
#include <gpxe/settings.h>
#include <gpxe/dhcp.h>
#include <gpxe/init.h>
#include <gpxe/sanboot.h>
#include <usr/autoboot.h>

struct setting keep_san_setting __setting = {
        .name = "keep-san",
        .description = "Preserve SAN connection",
        .tag = DHCP_EB_KEEP_SAN,
        .type = &setting_type_int8,
};

int keep_san ( void ) {
        int keep_san;

        keep_san = fetch_intz_setting ( NULL, &keep_san_setting );
        if ( ! keep_san )
                return 0;

        printf ( "Preserving connection to SAN disk\n" );
        shutdown_exit_flags |= SHUTDOWN_KEEP_DEVICES;
        return 1;
}