1 /* $NetBSD: clock_settime.c,v 1.2 2001/09/17 23:32:33 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Emmanuel Dreyfus. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "namespace.h" 35 36 #include <sys/types.h> 37 #include <sys/ioctl.h> 38 #include <sys/syscall.h> 39 40 #include <fcntl.h> 41 #include <paths.h> 42 #include <string.h> 43 #include <time.h> 44 #include <unistd.h> 45 46 #include <sys/clockctl.h> 47 48 #ifdef __weak_alias 49 __weak_alias(clock_settime,_clock_settime) 50 #endif 51 52 int 53 clock_settime(clock_id, tp) 54 clockid_t clock_id; 55 const struct timespec *tp; 56 { 57 struct clockctl_clock_settime_args args; 58 int error; 59 int fd; 60 quad_t q; 61 int rv; 62 63 /* 64 * Root always uses the settimeofday syscall 65 */ 66 if (geteuid() == 0) 67 goto try_syscall; 68 69 /* 70 * Try to use /dev/clockctl, and revert to 71 * settimeofday syscall if it fails. 72 */ 73 fd = open(_PATH_CLOCKCTL, O_WRONLY, 0); 74 if (fd == -1) 75 goto try_syscall; 76 77 args.clock_id = clock_id; 78 (void)memcpy (&args.tp, tp, sizeof(tp)); 79 error = ioctl(fd, CLOCKCTL_CLOCK_SETTIME, &args); 80 (void)close(fd); 81 if (!error) 82 return 0; 83 84 try_syscall: 85 q = __syscall((quad_t)SYS_clock_settime, clock_id, tp); 86 if (/* LINTED constant */ sizeof (quad_t) == sizeof (register_t) || 87 /* LINTED constant */ BYTE_ORDER == LITTLE_ENDIAN) 88 rv = (int)q; 89 else 90 rv = (int)((u_quad_t)q >> 32); 91 return rv; 92 } 93