adjtime.c revision 1.2.2.2
1 1.2.2.2 nathanw /* $NetBSD: adjtime.c,v 1.2.2.2 2001/10/08 20:21:35 nathanw Exp $ */ 2 1.2.2.2 nathanw 3 1.2.2.2 nathanw /* 4 1.2.2.2 nathanw * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 1.2.2.2 nathanw * All rights reserved. 6 1.2.2.2 nathanw * 7 1.2.2.2 nathanw * This code is derived from software contributed to The NetBSD Foundation 8 1.2.2.2 nathanw * by Emmanuel Dreyfus. 9 1.2.2.2 nathanw * 10 1.2.2.2 nathanw * Redistribution and use in source and binary forms, with or without 11 1.2.2.2 nathanw * modification, are permitted provided that the following conditions 12 1.2.2.2 nathanw * are met: 13 1.2.2.2 nathanw * 1. Redistributions of source code must retain the above copyright 14 1.2.2.2 nathanw * notice, this list of conditions and the following disclaimer. 15 1.2.2.2 nathanw * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.2.2 nathanw * notice, this list of conditions and the following disclaimer in the 17 1.2.2.2 nathanw * documentation and/or other materials provided with the distribution. 18 1.2.2.2 nathanw * 3. The name of the author may not be used to endorse or promote products 19 1.2.2.2 nathanw * derived from this software without specific prior written permission. 20 1.2.2.2 nathanw * 21 1.2.2.2 nathanw * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 1.2.2.2 nathanw * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 1.2.2.2 nathanw * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 1.2.2.2 nathanw * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 1.2.2.2 nathanw * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 1.2.2.2 nathanw * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 1.2.2.2 nathanw * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 1.2.2.2 nathanw * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 1.2.2.2 nathanw * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 1.2.2.2 nathanw * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 1.2.2.2 nathanw * SUCH DAMAGE. 32 1.2.2.2 nathanw */ 33 1.2.2.2 nathanw 34 1.2.2.2 nathanw #include "namespace.h" 35 1.2.2.2 nathanw #include <fcntl.h> 36 1.2.2.2 nathanw #include <paths.h> 37 1.2.2.2 nathanw #include <unistd.h> 38 1.2.2.2 nathanw #include <time.h> 39 1.2.2.2 nathanw #include <string.h> 40 1.2.2.2 nathanw #include <sys/types.h> 41 1.2.2.2 nathanw #include <sys/ioctl.h> 42 1.2.2.2 nathanw #include <sys/syscall.h> 43 1.2.2.2 nathanw #include <sys/clockctl.h> 44 1.2.2.2 nathanw 45 1.2.2.2 nathanw #ifdef __weak_alias 46 1.2.2.2 nathanw __weak_alias(adjtime,_adjtime) 47 1.2.2.2 nathanw #endif 48 1.2.2.2 nathanw 49 1.2.2.2 nathanw int 50 1.2.2.2 nathanw adjtime(delta, olddelta) 51 1.2.2.2 nathanw const struct timeval *delta; 52 1.2.2.2 nathanw struct timeval *olddelta; 53 1.2.2.2 nathanw { 54 1.2.2.2 nathanw struct clockctl_adjtime_args args; 55 1.2.2.2 nathanw int error; 56 1.2.2.2 nathanw int fd; 57 1.2.2.2 nathanw quad_t q; 58 1.2.2.2 nathanw int rv; 59 1.2.2.2 nathanw 60 1.2.2.2 nathanw /* 61 1.2.2.2 nathanw * Root always uses the adjtime syscall 62 1.2.2.2 nathanw */ 63 1.2.2.2 nathanw if (geteuid() == 0) 64 1.2.2.2 nathanw goto try_syscall; 65 1.2.2.2 nathanw 66 1.2.2.2 nathanw /* 67 1.2.2.2 nathanw * Try to use /dev/clockctl, and revert to 68 1.2.2.2 nathanw * adjtime syscall if it fails. 69 1.2.2.2 nathanw */ 70 1.2.2.2 nathanw fd = open(_PATH_CLOCKCTL, O_WRONLY, 0); 71 1.2.2.2 nathanw if (fd == -1) 72 1.2.2.2 nathanw goto try_syscall; 73 1.2.2.2 nathanw 74 1.2.2.2 nathanw (void)memcpy(&args.delta, delta, sizeof(delta)); 75 1.2.2.2 nathanw error = ioctl(fd, CLOCKCTL_ADJTIME, &args); 76 1.2.2.2 nathanw (void)close(fd); 77 1.2.2.2 nathanw if (!error && olddelta) { 78 1.2.2.2 nathanw (void)memcpy(olddelta, &args.olddelta, sizeof(olddelta)); 79 1.2.2.2 nathanw return 0; 80 1.2.2.2 nathanw } 81 1.2.2.2 nathanw 82 1.2.2.2 nathanw try_syscall: 83 1.2.2.2 nathanw q = __syscall((quad_t)SYS_adjtime, delta, olddelta); 84 1.2.2.2 nathanw if (/* LINTED constant */ sizeof (quad_t) == sizeof (register_t) || 85 1.2.2.2 nathanw /* LINTED constant */ BYTE_ORDER == LITTLE_ENDIAN) 86 1.2.2.2 nathanw rv = (int)q; 87 1.2.2.2 nathanw else 88 1.2.2.2 nathanw rv = (int)((u_quad_t)q >> 32); 89 1.2.2.2 nathanw return rv; 90 1.2.2.2 nathanw } 91
Indexes created Wed Oct 01 19:09:53 GMT 2025