/* rtc.c - Use /dev/rtc for clock access */
#include <unistd.h> /* for close() */
#include <fcntl.h> /* for O_RDONLY */
+#include <sysexits.h>
#include <sys/ioctl.h>
#include "clock.h"
* used a struct rtc_time different from that used in mc146818rtc.h.
*/
-/* ia64 uses /dev/efirtc (char 10,136) */
-#if __ia64__
-#define RTC_DEV "/dev/efirtc"
-#else
-#define RTC_DEV "/dev/rtc"
-#endif
-
/* On Sparcs, there is a <asm/rtc.h> that defines different ioctls
(that are required on my machine). However, this include file
does not exist on other architectures. */
#endif
+/* ia64 uses /dev/efirtc (char 10,136) */
+/* devfs uses /dev/misc/rtc */
+#if __ia64__
+#define RTC_DEVN "efirtc"
+#else
+#define RTC_DEVN "rtc"
+#endif
+
+static char *rtc_dev_name;
+
+static int
+open_rtc(void) {
+ int rtc_fd;
+
+ rtc_dev_name = "/dev/" RTC_DEVN;
+ rtc_fd = open(rtc_dev_name, O_RDONLY);
+ if (rtc_fd < 0 && errno == ENOENT) {
+ rtc_dev_name = "/dev/misc/" RTC_DEVN;
+ rtc_fd = open(rtc_dev_name, O_RDONLY);
+ if (rtc_fd < 0 && errno == ENOENT)
+ rtc_dev_name = "/dev/" RTC_DEVN;
+ }
+ return rtc_fd;
+}
+
+static int
+open_rtc_or_exit(void) {
+ int rtc_fd = open_rtc();
+
+ if (rtc_fd < 0) {
+ outsyserr(_("open() of %s failed"), rtc_dev_name);
+ exit(EX_OSFILE);
+ }
+ return rtc_fd;
+}
+
static int
do_rtc_read_ioctl(int rtc_fd, struct tm *tm) {
- int rc;
- char *ioctlname;
-#ifdef __sparc__
- struct sparc_rtc_time stm;
+ int rc = -1;
+ char *ioctlname;
- ioctlname = "RTCGET";
- rc = ioctl(rtc_fd, RTCGET, &stm);
-#else
- ioctlname = "RTC_RD_TIME";
- rc = ioctl(rtc_fd, RTC_RD_TIME, tm);
-#endif
- if (rc == -1) {
- perror(ioctlname);
- fprintf(stderr, _("ioctl() to %s to read the time failed.\n"),RTC_DEV);
- exit(5);
- }
#ifdef __sparc__
- tm->tm_sec = stm.sec;
- tm->tm_min = stm.min;
- tm->tm_hour = stm.hour;
- tm->tm_mday = stm.dom;
- tm->tm_mon = stm.month - 1;
- tm->tm_year = stm.year - 1900;
- tm->tm_wday = stm.dow - 1;
- tm->tm_yday = -1; /* day in the year */
+ /* some but not all sparcs use a different ioctl and struct */
+ struct sparc_rtc_time stm;
+
+ ioctlname = "RTCGET";
+ rc = ioctl(rtc_fd, RTCGET, &stm);
+ if (rc == 0) {
+ tm->tm_sec = stm.sec;
+ tm->tm_min = stm.min;
+ tm->tm_hour = stm.hour;
+ tm->tm_mday = stm.dom;
+ tm->tm_mon = stm.month - 1;
+ tm->tm_year = stm.year - 1900;
+ tm->tm_wday = stm.dow - 1;
+ tm->tm_yday = -1; /* day in the year */
+ }
#endif
- tm->tm_isdst = -1; /* don't know whether it's daylight */
- return 0;
-}
-
+ if (rc == -1) { /* no sparc, or RTCGET failed */
+ ioctlname = "RTC_RD_TIME";
+ rc = ioctl(rtc_fd, RTC_RD_TIME, tm);
+ }
+ if (rc == -1) {
+ perror(ioctlname);
+ fprintf(stderr, _("ioctl() to %s to read the time failed.\n"),
+ rtc_dev_name);
+ exit(EX_IOERR);
+ }
+
+ tm->tm_isdst = -1; /* don't know whether it's dst */
+ return 0;
+}
static int
busywait_for_rtc_clock_tick(const int rtc_fd) {
int rc;
if (debug)
- printf(_("Waiting in loop for time from %s to change\n"),RTC_DEV);
+ printf(_("Waiting in loop for time from %s to change\n"),
+ rtc_dev_name);
rc = do_rtc_read_ioctl(rtc_fd, &start_time);
if (rc)
int rtc_fd; /* File descriptor of /dev/rtc */
int ret;
- rtc_fd = open(RTC_DEV,O_RDONLY);
+ rtc_fd = open(rtc_dev_name, O_RDONLY);
if (rtc_fd == -1) {
- outsyserr(_("open() of %s failed"),RTC_DEV);
+ outsyserr(_("open() of %s failed"), rtc_dev_name);
ret = 1;
} else {
int rc; /* Return code from ioctl */
/* Turn on update interrupts (one per second) */
-#if defined(__alpha__) || defined(__sparc__)
+#if defined(__alpha__) || defined(__sparc__) || defined(__x86_64__)
/* Not all alpha kernels reject RTC_UIE_ON, but probably they should. */
rc = -1;
errno = EINVAL;
#else
rc = ioctl(rtc_fd, RTC_UIE_ON, 0);
#endif
- if (rc == -1 && errno == EINVAL) {
+ if (rc == -1 && (errno == ENOTTY || errno == EINVAL)) {
/* This rtc device doesn't have interrupt functions. This is typical
on an Alpha, where the Hardware Clock interrupts are used by the
kernel for the system clock, so aren't at the user's disposal.
*/
if (debug)
- printf(_("%s does not have interrupt functions. "),RTC_DEV);
+ printf(_("%s does not have interrupt functions. "),
+ rtc_dev_name);
ret = busywait_for_rtc_clock_tick(rtc_fd);
} else if (rc == 0) {
unsigned long dummy;
/* this blocks until the next update interrupt */
rc = read(rtc_fd, &dummy, sizeof(dummy));
if (rc == -1) {
- outsyserr(_("read() to %s to wait for clock tick failed"),RTC_DEV);
+ outsyserr(_("read() to %s to wait for clock tick failed"),
+ rtc_dev_name);
ret = 1;
} else {
ret = 0;
/* Turn off update interrupts */
rc = ioctl(rtc_fd, RTC_UIE_OFF, 0);
if (rc == -1)
- outsyserr(_("ioctl() to %s to turn off update interrupts "
- "failed"),RTC_DEV);
+ outsyserr(_("ioctl() to %s to turn off update interrupts failed"),
+ rtc_dev_name);
} else {
outsyserr(_("ioctl() to %s to turn on update interrupts "
- "failed unexpectedly"),RTC_DEV);
+ "failed unexpectedly"), rtc_dev_name);
ret = 1;
}
close(rtc_fd);
static int
read_hardware_clock_rtc(struct tm *tm) {
-/*----------------------------------------------------------------------------
- Read the hardware clock and return the current time via <tm>
- argument. Use ioctls to "rtc" device /dev/rtc.
------------------------------------------------------------------------------*/
- int rtc_fd; /* File descriptor of /dev/rtc */
+ int rtc_fd;
- rtc_fd = open(RTC_DEV,O_RDONLY);
- if (rtc_fd == -1) {
- outsyserr(_("open() of %s failed"),RTC_DEV);
- exit(5);
- }
+ rtc_fd = open_rtc_or_exit();
- /* Read the RTC time/date */
- do_rtc_read_ioctl(rtc_fd, tm);
+ /* Read the RTC time/date, return answer via tm */
+ do_rtc_read_ioctl(rtc_fd, tm);
- close(rtc_fd);
- return 0;
+ close(rtc_fd);
+ return 0;
}
static int
set_hardware_clock_rtc(const struct tm *new_broken_time) {
-/*----------------------------------------------------------------------------
+/*-------------------------------------------------------------------------
Set the Hardware Clock to the broken down time <new_broken_time>.
Use ioctls to "rtc" device /dev/rtc.
-----------------------------------------------------------------------------*/
- int rc;
- int rtc_fd;
+ -------------------------------------------------------------------------*/
+ int rc = -1;
+ int rtc_fd;
+ char *ioctlname;
+
+ rtc_fd = open_rtc_or_exit();
- rtc_fd = open(RTC_DEV, O_RDONLY);
- if (rtc_fd < 0) {
- outsyserr(_("Unable to open %s"),RTC_DEV);
- exit(5);
- } else {
- char *ioctlname;
#ifdef __sparc__
- struct sparc_rtc_time stm;
-
- stm.sec = new_broken_time->tm_sec;
- stm.min = new_broken_time->tm_min;
- stm.hour = new_broken_time->tm_hour;
- stm.dom = new_broken_time->tm_mday;
- stm.month = new_broken_time->tm_mon + 1;
- stm.year = new_broken_time->tm_year + 1900;
- stm.dow = new_broken_time->tm_wday + 1;
-
- ioctlname = "RTCSET";
- rc = ioctl(rtc_fd, RTCSET, &stm);
-#else
- ioctlname = "RTC_SET_TIME";
- rc = ioctl(rtc_fd, RTC_SET_TIME, new_broken_time);
+ {
+ struct sparc_rtc_time stm;
+
+ stm.sec = new_broken_time->tm_sec;
+ stm.min = new_broken_time->tm_min;
+ stm.hour = new_broken_time->tm_hour;
+ stm.dom = new_broken_time->tm_mday;
+ stm.month = new_broken_time->tm_mon + 1;
+ stm.year = new_broken_time->tm_year + 1900;
+ stm.dow = new_broken_time->tm_wday + 1;
+
+ ioctlname = "RTCSET";
+ rc = ioctl(rtc_fd, RTCSET, &stm);
+ }
#endif
- if (rc == -1) {
- perror(ioctlname);
- fprintf(stderr, _("ioctl() to %s to set the time failed.\n"),RTC_DEV);
- exit(5);
- } else {
- if (debug)
- printf(_("ioctl(%s) was successful.\n"), ioctlname);
- }
- close(rtc_fd);
- }
- return 0;
+ if (rc == -1) { /* no sparc, or RTCSET failed */
+ ioctlname = "RTC_SET_TIME";
+ rc = ioctl(rtc_fd, RTC_SET_TIME, new_broken_time);
+ }
+
+ if (rc == -1) {
+ perror(ioctlname);
+ fprintf(stderr, _("ioctl() to %s to set the time failed.\n"),
+ rtc_dev_name);
+ exit(EX_IOERR);
+ }
+
+ if (debug)
+ printf(_("ioctl(%s) was successful.\n"), ioctlname);
+
+ close(rtc_fd);
+ return 0;
}
}
static struct clock_ops rtc = {
- RTC_DEV " interface to clock",
+ "/dev/" RTC_DEVN " interface to clock",
get_permissions_rtc,
read_hardware_clock_rtc,
set_hardware_clock_rtc,
/* return &rtc if /dev/rtc can be opened, NULL otherwise */
struct clock_ops *
probe_for_rtc_clock(){
- int rtc_fd = open(RTC_DEV, O_RDONLY);
- if (rtc_fd > 0) {
- close(rtc_fd);
- return &rtc;
- }
- if (debug)
- outsyserr(_("Open of %s failed"),RTC_DEV);
- return NULL;
+ int rtc_fd = open_rtc();
+ if (rtc_fd >= 0) {
+ close(rtc_fd);
+ return &rtc;
+ }
+ if (debug)
+ outsyserr(_("Open of %s failed"), rtc_dev_name);
+ return NULL;
}
----------------------------------------------------------------------------*/
int rtc_fd;
- rtc_fd = open(RTC_DEV, O_RDONLY);
+ rtc_fd = open_rtc();
if (rtc_fd < 0) {
if (!silent) {
if (errno == ENOENT)
fprintf(stderr, _(
"To manipulate the epoch value in the kernel, we must "
"access the Linux 'rtc' device driver via the device special "
- "file %s. This file does not exist on this system.\n"),RTC_DEV);
+ "file %s. This file does not exist on this system.\n"),
+ rtc_dev_name);
else
- outsyserr(_("Unable to open %s"),RTC_DEV);
+ outsyserr(_("Unable to open %s"), rtc_dev_name);
}
return 1;
}
if (ioctl(rtc_fd, RTC_EPOCH_READ, epoch_p) == -1) {
if (!silent)
- outsyserr(_("ioctl(RTC_EPOCH_READ) to %s failed"),RTC_DEV);
+ outsyserr(_("ioctl(RTC_EPOCH_READ) to %s failed"), rtc_dev_name);
close(rtc_fd);
return 1;
}
if (debug)
printf(_("we have read epoch %ld from %s "
- "with RTC_EPOCH_READ ioctl.\n"), *epoch_p,RTC_DEV);
+ "with RTC_EPOCH_READ ioctl.\n"), *epoch_p, rtc_dev_name);
close(rtc_fd);
return 0;
return 1;
}
- rtc_fd = open(RTC_DEV, O_RDONLY);
+ rtc_fd = open_rtc();
if (rtc_fd < 0) {
if (errno == ENOENT)
fprintf(stderr, _("To manipulate the epoch value in the kernel, we must "
"access the Linux 'rtc' device driver via the device special "
- "file %s. This file does not exist on this system.\n"),RTC_DEV);
+ "file %s. This file does not exist on this system.\n"),
+ rtc_dev_name);
else
- outsyserr(_("Unable to open %s"),RTC_DEV);
+ outsyserr(_("Unable to open %s"), rtc_dev_name);
return 1;
}
if (debug)
printf(_("setting epoch to %ld "
- "with RTC_EPOCH_SET ioctl to %s.\n"), epoch, RTC_DEV);
+ "with RTC_EPOCH_SET ioctl to %s.\n"), epoch, rtc_dev_name);
if (ioctl(rtc_fd, RTC_EPOCH_SET, epoch) == -1) {
if (errno == EINVAL)
fprintf(stderr, _("The kernel device driver for %s "
- "does not have the RTC_EPOCH_SET ioctl.\n"),RTC_DEV);
+ "does not have the RTC_EPOCH_SET ioctl.\n"), rtc_dev_name);
else
- outsyserr(_("ioctl(RTC_EPOCH_SET) to %s failed"),RTC_DEV);
+ outsyserr(_("ioctl(RTC_EPOCH_SET) to %s failed"), rtc_dev_name);
close(rtc_fd);
return 1;
}
projects / thirdparty / util-linux.git / blobdiff