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 <stdio.h> 30 #include <errno.h> 31 #include <sys/stat.h> 32 #include "cpuacct.h" 33 #include <fcntl.h> 34 35 int cpuacct_add(uid_t uid) 36 { 37 int count; 38 int fd; 39 char buf[80]; 40 ssize_t n; 41 int ret = 0; 42 43 count = snprintf(buf, sizeof(buf), "/acct/uid/%d/tasks", uid); 44 fd = open(buf, O_RDWR | O_CREAT, 0666); 45 if (fd == -1) { 46 /* Note: sizeof("tasks") returns 6, which includes the NULL char */ 47 buf[count - sizeof("tasks")] = 0; 48 if (mkdir(buf, 0775) < 0) 49 return -errno; 50 51 /* Note: sizeof("tasks") returns 6, which includes the NULL char */ 52 buf[count - sizeof("tasks")] = '/'; 53 fd = open(buf, O_RDWR | O_CREAT, 0666); 54 } 55 if (fd == -1) 56 return -errno; 57 58 n = TEMP_FAILURE_RETRY(write(fd, "0", 1)); 59 if (n < 0) 60 ret = -errno; 61 else if (n == 0) 62 ret = -EIO; 63 64 if (TEMP_FAILURE_RETRY(close(fd)) == -1) 65 return -errno; 66 67 return ret; 68 } 69
