michael@0: /*
michael@0:  * Copyright (C) 2010 The Android Open Source Project
michael@0:  * All rights reserved.
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  *  * Redistributions of source code must retain the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer.
michael@0:  *  * Redistributions in binary form must reproduce the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer in
michael@0:  *    the documentation and/or other materials provided with the
michael@0:  *    distribution.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
michael@0:  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
michael@0:  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
michael@0:  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
michael@0:  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
michael@0:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
michael@0:  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
michael@0:  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
michael@0:  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
michael@0:  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
michael@0:  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
michael@0:  * SUCH DAMAGE.
michael@0:  */
michael@0: #include <unistd.h>
michael@0: #include <errno.h>
michael@0: #include <sys/stat.h>
michael@0: #include <fcntl.h>
michael@0: #include <stdio.h>
michael@0: #include "cpuacct.h"
michael@0: 
michael@0: int cpuacct_add(uid_t uid)
michael@0: {
michael@0:     int count;
michael@0:     int fd;
michael@0:     char buf[80];
michael@0: 
michael@0:     count = snprintf(buf, sizeof(buf), "/acct/uid/%d/tasks", uid);
michael@0:     fd = open(buf, O_RDWR|O_CREAT|O_TRUNC|O_SYNC);
michael@0:     if (fd < 0) {
michael@0:         /* Note: sizeof("tasks") returns 6, which includes the NULL char */
michael@0:         buf[count - sizeof("tasks")] = 0;
michael@0:         if (mkdir(buf, 0775) < 0)
michael@0:             return -errno;
michael@0: 
michael@0:         /* Note: sizeof("tasks") returns 6, which includes the NULL char */
michael@0:         buf[count - sizeof("tasks")] = '/';
michael@0:         fd = open(buf, O_RDWR|O_CREAT|O_TRUNC|O_SYNC);
michael@0:     }
michael@0:     if (fd < 0)
michael@0:         return -errno;
michael@0: 
michael@0:     write(fd, "0", 2);
michael@0:     if (close(fd))
michael@0:         return -errno;
michael@0: 
michael@0:     return 0;
michael@0: }