busybox/libbb/find_root_device.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"

char *find_block_device(char *path)
{
	DIR *dir;
	struct dirent *entry;
	struct stat st;
	dev_t dev;
	char *retpath=NULL;

	if (stat(path, &st) || !(dir = opendir("/dev")))
		return NULL;
	dev = (st.st_mode & S_IFMT) == S_IFBLK ? st.st_rdev : st.st_dev;
	while ((entry = readdir(dir)) != NULL) {
		char devpath[PATH_MAX];
		sprintf(devpath,"/dev/%s", entry->d_name);
		if (!stat(devpath, &st) && S_ISBLK(st.st_mode) && st.st_rdev == dev) {
			retpath = xstrdup(devpath);
			break;
		}
	}
	closedir(dir);

	return retpath;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Utility routines.
4	*
5	* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6	*
7	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8	*/
9
10	#include "libbb.h"
11
12	char find_block_device(char path)
13	{
14	DIR *dir;
15	struct dirent *entry;
16	struct stat st;
17	dev_t dev;
18	char *retpath=NULL;
19
20	if (stat(path, &st) \|\| !(dir = opendir("/dev")))
21	return NULL;
22	dev = (st.st_mode & S_IFMT) == S_IFBLK ? st.st_rdev : st.st_dev;
23	while ((entry = readdir(dir)) != NULL) {
24	char devpath[PATH_MAX];
25	sprintf(devpath,"/dev/%s", entry->d_name);
26	if (!stat(devpath, &st) && S_ISBLK(st.st_mode) && st.st_rdev == dev) {
27	retpath = xstrdup(devpath);
28	break;
29	}
30	}
31	closedir(dir);
32
33	return retpath;
34	}