+++ /dev/null
-/*
- * kd.c - KDGHWCLK stuff, possibly m68k only, likely to be deprecated
- */
-#include "hwclock.h"
-
-#ifdef __m68k__
-
-# include <fcntl.h>
-# include <sysexits.h>
-# include <sys/ioctl.h>
-# include <unistd.h>
-
-# include "nls.h"
-
-/* Get defines for KDGHWCLK and KDSHWCLK (m68k) */
-# include <linux/kd.h>
-
-/* Even on m68k, if KDGHWCLK (antique) is not defined, don't build this */
-
-#endif
-
-#if !defined(__m68k__) || !defined(KDGHWCLK)
-
-#include <stddef.h>
-struct clock_ops *probe_for_kd_clock(void)
-{
- return NULL;
-}
-
-#else /* __m68k__ && KDGHWCLK */
-
-/* Opened by probe_for_kd_clock(), and never closed. */
-static int con_fd = -1;
-static char *con_fd_filename; /* usually "/dev/tty1" */
-
-/*
- * Wait for the top of a clock tick by calling KDGHWCLK in a busy loop until
- * we see it.
- */
-static int synchronize_to_clock_tick_kd(void)
-{
- /* The time when we were called (and started waiting) */
- struct hwclk_time start_time, nowtime;
- struct timeval begin, now;
-
- if (debug)
- printf(_("Waiting in loop for time from KDGHWCLK to change\n"));
-
- if (ioctl(con_fd, KDGHWCLK, &start_time) == -1) {
- warn(_("KDGHWCLK ioctl to read time failed"));
- return 3;
- }
-
- /*
- * Wait for change. Should be within a second, but in case something
- * weird happens, we have a time limit (1.5s) on this loop to reduce
- * the impact of this failure.
- */
- gettimeofday(&begin, NULL);
- do {
- /*
- * Added by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
- *
- * "The culprit is the fast loop with KDGHWCLK ioctls. It
- * seems the kernel gets confused by those on Amigas with
- * A2000 RTCs and simply hangs after some time. Inserting a
- * sleep helps."
- */
- xusleep(1);
-
- if (ioctl(con_fd, KDGHWCLK, &nowtime) == -1) {
- warn(_("KDGHWCLK ioctl to read time failed in loop"));
- return 3;
- }
- if (start_time.tm_sec != nowtime.tm_sec)
- break;
- gettimeofday(&now, NULL);
- if (time_diff(now, begin) > 1.5) {
- warnx(_("Timed out waiting for time change."));
- return 2;
- }
- } while (1);
-
- return 0;
-}
-
-/*
- * Read the hardware clock and return the current time via <tm> argument.
- * Use ioctls to /dev/tty1 on what we assume is an m68k machine.
- *
- * Note that we don't use /dev/console here. That might be a serial console.
- */
-static int read_hardware_clock_kd(struct tm *tm)
-{
- struct hwclk_time t;
-
- if (ioctl(con_fd, KDGHWCLK, &t) == -1) {
- warn(_("ioctl() failed to read time from %s"),
- con_fd_filename);
- hwclock_exit(EX_IOERR);
- }
-
- tm->tm_sec = t.sec;
- tm->tm_min = t.min;
- tm->tm_hour = t.hour;
- tm->tm_mday = t.day;
- tm->tm_mon = t.mon;
- tm->tm_year = t.year;
- tm->tm_wday = t.wday;
- tm->tm_isdst = -1; /* Don't know if it's Daylight Savings Time */
-
- return 0;
-}
-
-/*
- * Set the Hardware Clock to the time <new_broken_time>. Use ioctls to
- * /dev/tty1 on what we assume is an m68k machine.
- *
- * Note that we don't use /dev/console here. That might be a serial console.
- */
-static int set_hardware_clock_kd(const struct tm *new_broken_time)
-{
- struct hwclk_time t;
-
- t.sec = new_broken_time->tm_sec;
- t.min = new_broken_time->tm_min;
- t.hour = new_broken_time->tm_hour;
- t.day = new_broken_time->tm_mday;
- t.mon = new_broken_time->tm_mon;
- t.year = new_broken_time->tm_year;
- t.wday = new_broken_time->tm_wday;
-
- if (ioctl(con_fd, KDSHWCLK, &t) == -1) {
- warn(_("ioctl KDSHWCLK failed"));
- hwclock_exit(EX_IOERR);
- }
- return 0;
-}
-
-static int get_permissions_kd(void)
-{
- return 0;
-}
-
-static struct clock_ops kd = {
- N_("Using the KDGHWCLK interface to m68k clock."),
- get_permissions_kd,
- read_hardware_clock_kd,
- set_hardware_clock_kd,
- synchronize_to_clock_tick_kd,
-};
-
-/* return &kd if KDGHWCLK works, NULL otherwise */
-struct clock_ops *probe_for_kd_clock()
-{
- struct clock_ops *ret = NULL;
- struct hwclk_time t;
-
- if (con_fd < 0) { /* first time here */
- con_fd_filename = "/dev/tty1";
- con_fd = open(con_fd_filename, O_RDONLY);
- }
- if (con_fd < 0) {
- /* perhaps they are using devfs? */
- con_fd_filename = "/dev/vc/1";
- con_fd = open(con_fd_filename, O_RDONLY);
- }
- if (con_fd < 0) {
- /* probably KDGHWCLK exists on m68k only */
- warn(_("Can't open /dev/tty1 or /dev/vc/1"));
- } else {
- if (ioctl(con_fd, KDGHWCLK, &t) == -1) {
- if (errno != EINVAL)
- warn(_("KDGHWCLK ioctl failed"));
- } else
- ret = &kd;
- }
- return ret;
-}
-#endif /* __m68k__ && KDGHWCLK */
projects / thirdparty / util-linux.git / commitdiff
