80 lines
2 KiB
C
80 lines
2 KiB
C
|
/*
|
||
|
|
* 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 <sys/stat.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#define SEARCH_SPACE (16 * 1024)
|
||
|
|
#define CMDLINE_MAX 512
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|