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Diffstat (limited to '')
| -rw-r--r-- | sys_netbsd.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/sys_netbsd.c b/sys_netbsd.c new file mode 100644 index 0000000..e1b99bb --- /dev/null +++ b/sys_netbsd.c @@ -0,0 +1,158 @@ +/* + chronyd/chronyc - Programs for keeping computer clocks accurate. + + ********************************************************************** + * Copyright (C) Richard P. Curnow 1997-2001 + * Copyright (C) J. Hannken-Illjes 2001 + * Copyright (C) Miroslav Lichvar 2015 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + ********************************************************************** + + ======================================================================= + + Driver file for the NetBSD and FreeBSD operating system. + */ + +#include "config.h" + +#include "sysincl.h" + +#include "sys_netbsd.h" +#include "sys_timex.h" +#include "logging.h" +#include "privops.h" +#include "util.h" + +/* Maximum frequency offset accepted by the kernel (in ppm) */ +#define MAX_FREQ 500.0 + +/* Minimum assumed rate at which the kernel updates the clock frequency */ +#define MIN_TICK_RATE 100 + +/* Interval between kernel updates of the adjtime() offset */ +#define ADJTIME_UPDATE_INTERVAL 1.0 + +/* Maximum adjtime() slew rate (in ppm) */ +#define MAX_ADJTIME_SLEWRATE 5000.0 + +/* Minimum offset adjtime() slews faster than MAX_FREQ */ +#define MIN_FASTSLEW_OFFSET 1.0 + +/* ================================================== */ + +/* Positive offset means system clock is fast of true time, therefore + slew backwards */ + +static void +accrue_offset(double offset, double corr_rate) +{ + struct timeval newadj, oldadj; + double doldadj; + + UTI_DoubleToTimeval(-offset, &newadj); + + if (PRV_AdjustTime(&newadj, &oldadj) < 0) + LOG_FATAL("adjtime() failed"); + + /* Add the old remaining adjustment if not zero */ + doldadj = UTI_TimevalToDouble(&oldadj); + if (doldadj != 0.0) { + UTI_DoubleToTimeval(-offset + doldadj, &newadj); + if (PRV_AdjustTime(&newadj, NULL) < 0) + LOG_FATAL("adjtime() failed"); + } +} + +/* ================================================== */ + +static void +get_offset_correction(struct timespec *raw, + double *corr, double *err) +{ + struct timeval remadj; + double adjustment_remaining; +#ifdef MACOSX + struct timeval tv = {0, 0}; + + if (PRV_AdjustTime(&tv, &remadj) < 0) + LOG_FATAL("adjtime() failed"); + + if (PRV_AdjustTime(&remadj, NULL) < 0) + LOG_FATAL("adjtime() failed"); +#else + if (PRV_AdjustTime(NULL, &remadj) < 0) + LOG_FATAL("adjtime() failed"); +#endif + + adjustment_remaining = UTI_TimevalToDouble(&remadj); + + *corr = adjustment_remaining; + if (err) { + if (*corr != 0.0) + *err = 1.0e-6 * MAX_ADJTIME_SLEWRATE / ADJTIME_UPDATE_INTERVAL; + else + *err = 0.0; + } +} + +/* ================================================== */ + +void +SYS_NetBSD_Initialise(void) +{ + SYS_Timex_InitialiseWithFunctions(MAX_FREQ, 1.0 / MIN_TICK_RATE, + NULL, NULL, NULL, + MIN_FASTSLEW_OFFSET, MAX_ADJTIME_SLEWRATE, + accrue_offset, get_offset_correction); +} + +/* ================================================== */ + +void +SYS_NetBSD_Finalise(void) +{ + SYS_Timex_Finalise(); +} + +/* ================================================== */ + +#ifdef FEAT_PRIVDROP +void +SYS_NetBSD_DropRoot(uid_t uid, gid_t gid, SYS_ProcessContext context, int clock_control) +{ +#ifdef NETBSD + int fd; +#endif + + /* On NetBSD the helper is used only for socket binding, but on FreeBSD + it's used also for setting and adjusting the system clock */ + if (context == SYS_MAIN_PROCESS) + PRV_StartHelper(); + + UTI_DropRoot(uid, gid); + +#ifdef NETBSD + if (!clock_control) + return; + + /* Check if we have write access to /dev/clockctl */ + fd = open("/dev/clockctl", O_WRONLY); + if (fd < 0) + LOG_FATAL("Can't write to /dev/clockctl"); + close(fd); +#endif +} +#endif |