source: bootcd/isolinux/syslinux-6.03/gpxe/src/hci/commands/sanboot_cmd.c

#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include <gpxe/command.h>
#include <usr/autoboot.h>

FILE_LICENCE ( GPL2_OR_LATER );

/**
 * "sanboot" command syntax message
 *
 * @v argv              Argument list
 */
static void sanboot_syntax ( char **argv ) {
        printf ( "Usage:\n"
                 "  %s <root-path>\n"
                 "\n"
                 "Boot from SAN target\n",
                 argv[0] );
}

/**
 * The "sanboot" command
 *
 * @v argc              Argument count
 * @v argv              Argument list
 * @ret rc              Exit code
 */
static int sanboot_exec ( int argc, char **argv ) {
        static struct option longopts[] = {
                { "help", 0, NULL, 'h' },
                { NULL, 0, NULL, 0 },
        };
        const char *root_path = NULL;
        int c;
        int rc;

        /* Parse options */
        while ( ( c = getopt_long ( argc, argv, "h", longopts, NULL ) ) >= 0 ){
                switch ( c ) {
                case 'h':
                        /* Display help text */
                default:
                        /* Unrecognised/invalid option */
                        sanboot_syntax ( argv );
                        return 1;
                }
        }

        /* Need exactly one image name remaining after the options */
        if ( optind != ( argc - 1 ) ) {
                sanboot_syntax ( argv );
                return 1;
        }
        root_path = argv[optind];

        /* Boot from root path */
        if ( ( rc = boot_root_path ( root_path ) ) != 0 ) {
                printf ( "Could not boot from %s: %s\n",
                         root_path, strerror ( rc ) );
                return 1;
        }

        return 0;
}

struct command sanboot_command __command = {
        .name = "sanboot",
        .exec = sanboot_exec,
};