dev-setup.c revision 696fee7d95194948f7f6a17eab93213b925a846d
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010-2012 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include "dev-setup.h"
#include "log.h"
#include "macro.h"
#include "util.h"
#include "label.h"
static int symlink_and_label(const char *old_path, const char *new_path) {
int r;
assert(old_path);
assert(new_path);
r = label_context_set(new_path, S_IFLNK);
if (r < 0)
return r;
if (symlink(old_path, new_path) < 0)
r = -errno;
label_context_clear();
return r;
}
void dev_setup(const char *prefix) {
const char *j, *k;
static const char symlinks[] =
"-/proc/kcore\0" "/dev/core\0"
"/proc/self/fd\0" "/dev/fd\0"
"/proc/self/fd/0\0" "/dev/stdin\0"
"/proc/self/fd/1\0" "/dev/stdout\0"
"/proc/self/fd/2\0" "/dev/stderr\0";
NULSTR_FOREACH_PAIR(j, k, symlinks) {
if (j[0] == '-') {
j++;
if (access(j, F_OK))
continue;
}
if (prefix) {
char *linkname;
if (asprintf(&linkname, "%s/%s", prefix, k) < 0) {
log_oom();
break;
}
symlink_and_label(j, linkname);
free(linkname);
} else
symlink_and_label(j, k);
}
}