Return to ntp_adjtime.c CVS log | Up to [cvs.NetBSD.org] / src / lib / libc / sys |
File: [cvs.NetBSD.org] / src / lib / libc / sys / ntp_adjtime.c (download)
Revision 1.12, Sat Oct 15 23:00:02 2011 UTC (12 years, 6 months ago) by christos
close on exec fixes: - open + fcntl -> open O_CLOEXEC - configuration database file descriptors that can stay open are now opened fopen(db, "re") |
/* $NetBSD: ntp_adjtime.c,v 1.12 2011/10/15 23:00:02 christos Exp $ */ /* * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Emmanuel Dreyfus. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> #if defined(LIBC_SCCS) && !defined(lint) __RCSID("$NetBSD: ntp_adjtime.c,v 1.12 2011/10/15 23:00:02 christos Exp $"); #endif /* LIBC_SCCS and not lint */ #include "namespace.h" #include <sys/types.h> #include <sys/time.h> #include <sys/timex.h> #include <sys/ioctl.h> #include <sys/syscall.h> #include <sys/clockctl.h> #include <errno.h> #include <fcntl.h> #include <paths.h> #include <string.h> #include <unistd.h> #ifdef __weak_alias __weak_alias(ntp_adjtime,_ntp_adjtime) #endif extern int __clockctl_fd; int __ntp_adjtime(struct timex *); int ntp_adjtime(tp) struct timex *tp; { struct clockctl_ntp_adjtime args; int error; int rv; /* * we always attempt to use the syscall unless we had to * use the clockctl device before * * ntp_adjtime() is callable for mortals if tp->modes == 0 ! */ if (__clockctl_fd == -1) { rv = __ntp_adjtime(tp); /* * if we fail with EPERM we try the clockctl device */ if (rv != -1 || errno != EPERM) return rv; /* * If this fails, it means that we are not root * and we cannot open clockctl. This is a true * failure. */ __clockctl_fd = open(_PATH_CLOCKCTL, O_WRONLY | O_CLOEXEC, 0); if (__clockctl_fd == -1) { /* original error was EPERM - don't leak open errors */ errno = EPERM; return -1; } } /* * If __clockctl_fd >=0, clockctl has already been open * and used, so we carry on using it. */ args.tp = tp; error = ioctl(__clockctl_fd, CLOCKCTL_NTP_ADJTIME, &args); /* * There is no way to get retval set through ioctl(), hence we * have to handle it here, using args.retval */ if (error == 0) { rv = (int)args.retval; return rv; } return error; }