[hackers] [ubase] Add initial version of hwclock(8) || sin

From: <git_AT_suckless.org>
Date: Tue, 03 Jun 2014 15:52:19 +0200

commit dacfb76c75bbd9a5020d4a3bd22b993e1e9dfebd
Author: sin <sin_AT_2f30.org>
Date: Tue Jun 3 14:46:27 2014 +0100

    Add initial version of hwclock(8)

diff --git a/Makefile b/Makefile
index e55d770..d0b6acd 100644
--- a/Makefile
+++ b/Makefile
_AT_@ -3,7 +3,7 @@ include config.mk
 .POSIX:
 .SUFFIXES: .c .o
 
-HDR = arg.h config.def.h proc.h reboot.h util.h
+HDR = arg.h config.def.h proc.h reboot.h rtc.h util.h
 LIB = \
         util/agetcwd.o \
         util/apathmax.o \
_AT_@ -29,6 +29,7 @@ SRC = \
         free.c \
         getty.c \
         halt.c \
+ hwclock.c \
         id.c \
         insmod.c \
         killall5.c \
diff --git a/hwclock.c b/hwclock.c
new file mode 100644
index 0000000..093d5bd
--- /dev/null
+++ b/hwclock.c
_AT_@ -0,0 +1,106 @@
+/* See LICENSE file for copyright and license details. */
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+#include "rtc.h"
+#include "util.h"
+
+static void echotime(char *);
+static void readrtctm(struct tm *, int);
+static void writertctm(struct tm *, int);
+static void writetime(char *);
+
+static void
+usage(void)
+{
+ eprintf("usage: %s [-rw] [-u]
", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+ char *dev = "/dev/rtc";
+ int rflag = 0;
+ int wflag = 0;
+
+ ARGBEGIN {
+ case 'r':
+ rflag = 1;
+ break;
+ case 'w':
+ wflag = 1;
+ break;
+ case 'u':
+ break;
+ default:
+ usage();
+ } ARGEND;
+
+ if ((rflag ^ wflag) == 0)
+ eprintf("missing or incompatible function
");
+
+ /* Only UTC support at the moment */
+ setenv("TZ", "UTC0", 1);
+ tzset();
+
+ if (rflag == 1)
+ echotime(dev);
+ else if (wflag == 1)
+ writetime(dev);
+
+ return EXIT_SUCCESS;
+}
+
+static void
+echotime(char *dev)
+{
+ struct tm tm;
+ time_t t;
+ int fd;
+
+ fd = open(dev, O_RDONLY);
+ if (fd < 0)
+ eprintf("open %s:", dev);
+ readrtctm(&tm, fd);
+ t = mktime(&tm);
+ printf("%s", asctime(localtime(&t)));
+ close(fd);
+}
+
+static void
+readrtctm(struct tm *tm, int fd)
+{
+ memset(tm, 0, sizeof(*tm));
+ ioctl(fd, RTC_RD_TIME, tm);
+}
+
+static void
+writertctm(struct tm *tm, int fd)
+{
+ ioctl(fd, RTC_SET_TIME, tm);
+}
+
+static void
+writetime(char *dev)
+{
+ struct timeval tv;
+ struct tm *tm;
+ time_t t;
+ int fd;
+
+ fd = open(dev, O_WRONLY);
+ if (fd < 0)
+ eprintf("open %s:", dev);
+ gettimeofday(&tv, NULL);
+ t = tv.tv_sec;
+ tm = gmtime(&t);
+ writertctm(tm, fd);
+ close(fd);
+}
diff --git a/rtc.h b/rtc.h
new file mode 100644
index 0000000..9dd76c1
--- /dev/null
+++ b/rtc.h
_AT_@ -0,0 +1,2 @@
+#define RTC_RD_TIME _IOR('p', 0x09, struct tm) /* Read RTC time */
+#define RTC_SET_TIME _IOW('p', 0x0a, struct tm) /* Set RTC time */
Received on Tue Jun 03 2014 - 15:52:19 CEST