1 /*
2 * Copyright (C) 2010 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 #include <unistd.h>
29 #include <errno.h>
30 #include <sys/stat.h>
31 #include <fcntl.h>
32 #include <stdio.h>
33 #include "cpuacct.h"
34
cpuacct_add(uid_t uid)35 int cpuacct_add(uid_t uid)
36 {
37 int count;
38 int fd;
39 char buf[80];
40
41 count = snprintf(buf, sizeof(buf), "/acct/uid/%d/tasks", uid);
42 fd = open(buf, O_RDWR|O_CREAT|O_TRUNC|O_SYNC);
43 if (fd < 0) {
44 /* Note: sizeof("tasks") returns 6, which includes the NULL char */
45 buf[count - sizeof("tasks")] = 0;
46 if (mkdir(buf, 0775) < 0)
47 return -errno;
48
49 /* Note: sizeof("tasks") returns 6, which includes the NULL char */
50 buf[count - sizeof("tasks")] = '/';
51 fd = open(buf, O_RDWR|O_CREAT|O_TRUNC|O_SYNC);
52 }
53 if (fd < 0)
54 return -errno;
55
56 write(fd, "0", 2);
57 if (close(fd))
58 return -errno;
59
60 return 0;
61 }
62