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/*
 * patch-cmdline.c - patch the kernel command line on rb532
 *
 * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include
int main(int argc, char **argv) { int fd, found = 0, len, ret = -1; char *ptr, *p; if (argc != 3) { fprintf(stderr, "Usage: %s <file> <cmdline>\n", argv[0]); goto err1; } len = strlen(argv[2]); if (len + 9 > CMDLINE_MAX) { fprintf(stderr, "Command line string too long\n"); goto err1; } if (((fd = open(argv[1], O_RDWR)) < 0) || (ptr = (char *) mmap(0, SEARCH_SPACE + CMDLINE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1)) { fprintf(stderr, "Could not open kernel image"); goto err2; } for (p = ptr; p < (ptr + SEARCH_SPACE); p += 4) { if (memcmp(p, "CMDLINE:", 8) == 0) { found = 1; p += 8; break; } } if (!found) { fprintf(stderr, "Command line marker not found!\n"); goto err3; } memset(p, 0, CMDLINE_MAX - 8); strcpy(p, argv[2]); msync(p, CMDLINE_MAX, MS_SYNC|MS_INVALIDATE); ret = 0; err3: munmap((void *) ptr, len); err2: if (fd > 0) close(fd); err1: return ret; }