From: Ben Gras <ben@minix3.org>
Date: Wed, 6 Jul 2005 07:08:36 +0000 (+0000)
Subject: complete, tick-resolution gettimeofday() implementation
X-Git-Tag: v3.1.0~645
X-Git-Url: http://zhaoyanbai.com/repos/doc/tz-art.htm?a=commitdiff_plain;h=f0817fbd4cccf30d43d63ab28c43f96a42d97dd6;p=minix.git

complete, tick-resolution gettimeofday() implementation
---

diff --git a/include/minix/callnr.h b/include/minix/callnr.h
index bd75731d7..e3b10669a 100755
--- a/include/minix/callnr.h
+++ b/include/minix/callnr.h
@@ -1,4 +1,4 @@
-#define NCALLS		  90	/* number of system calls allowed */
+#define NCALLS		  91	/* number of system calls allowed */
 
 #define EXIT		   1 
 #define FORK		   2 
@@ -78,3 +78,4 @@
 #define FSYNC             87	/* to FS */
 #define GETPRIORITY       88	/* to PM */
 #define SETPRIORITY       89	/* to PM */
+#define GETTIMEOFDAY      90	/* to PM */
diff --git a/lib/posix/gettimeofday.c b/lib/posix/gettimeofday.c
index 6ec563604..f05ab5c86 100644
--- a/lib/posix/gettimeofday.c
+++ b/lib/posix/gettimeofday.c
@@ -3,16 +3,19 @@ gettimeofday.c
 */
 
 #include <sys/time.h>
+#include <lib.h>
 #include <time.h>
 
 int gettimeofday(struct timeval *_RESTRICT tp, void *_RESTRICT tzp)
 {
-	if (time(&tp->tv_sec) == (time_t)-1)
-		return -1;
-	tp->tv_usec= 0;
+  message m;
 
-	/* tzp has to be a nul pointer according to the standard. Otherwise
-	 * behavior is undefined. We can just ignore tzp.
-	 */
-	return 0;
+  if (_syscall(MM, GETTIMEOFDAY, &m) < 0)
+  	return -1;
+
+  tp->tv_sec = m.m2_l1;
+  tp->tv_usec = m.m2_l2;
+
+  return 0;
 }
+
diff --git a/man/man2/gettimeofday.2 b/man/man2/gettimeofday.2
new file mode 100644
index 000000000..0100fb80b
--- /dev/null
+++ b/man/man2/gettimeofday.2
@@ -0,0 +1,22 @@
+.TH GETTIMEOFDAY 2 "July 6, 2005"
+.UC 4
+.SH NAME
+gettimeofday \- get date and time
+.SH SYNOPSIS
+.ft B
+.nf
+#include <sys/time.h>
+
+int gettimeofday(struct timeval *tp, struct timezone *tzp)
+.fi
+.ft R
+.SH DESCRIPTION
+.B Gettimeofday
+returns the time in seconds and microseconds since epoch in GMT
+(midnight, january 1st, 1970). The timezone argument tzp is expected
+to be NULL.
+.SH RETURNS
+0 on success, -1 on error. If -1 is returned, errno is set to indicate
+the error.
+.SH "SEE ALSO
+.BR ctime (3).
diff --git a/servers/fs/table.c b/servers/fs/table.c
index cc8bbbf4e..0a2909f4f 100644
--- a/servers/fs/table.c
+++ b/servers/fs/table.c
@@ -107,6 +107,7 @@ PUBLIC _PROTOTYPE (int (*call_vec[]), (void) ) = {
 	do_fsync,	/* 87 = fsync */
 	no_sys,		/* 88 = getpriority */
 	no_sys,		/* 89 = setpriority */
+	no_sys,		/* 90 = gettimeofday */
 };
 /* This should not fail with "array size is negative": */
 extern int dummy[sizeof(call_vec) == NCALLS * sizeof(call_vec[0]) ? 1 : -1];
diff --git a/servers/pm/proto.h b/servers/pm/proto.h
index 108992b43..949a01828 100644
--- a/servers/pm/proto.h
+++ b/servers/pm/proto.h
@@ -86,6 +86,7 @@ _PROTOTYPE( void check_pending, (struct mproc *rmp)			);
 _PROTOTYPE( int do_stime, (void)					);
 _PROTOTYPE( int do_time, (void)						);
 _PROTOTYPE( int do_times, (void)					);
+_PROTOTYPE( int do_gettimeofday, (void)					);
 
 /* trace.c */
 _PROTOTYPE( int do_trace, (void)					);
diff --git a/servers/pm/table.c b/servers/pm/table.c
index 1768dd414..4f0ee23ef 100644
--- a/servers/pm/table.c
+++ b/servers/pm/table.c
@@ -106,6 +106,7 @@ _PROTOTYPE (int (*call_vec[NCALLS]), (void) ) = {
 	no_sys,		/* 87 = fsync */
 	do_getsetpriority,	/* 88 = getpriority */
 	do_getsetpriority,	/* 89 = setpriority */
+	do_gettimeofday,	/* 90 = gettimeofday */
 };
 /* This should not fail with "array size is negative": */
 extern int dummy[sizeof(call_vec) == NCALLS * sizeof(call_vec[0]) ? 1 : -1];
diff --git a/servers/pm/time.c b/servers/pm/time.c
index 9427de0f9..ae35c9dbb 100644
--- a/servers/pm/time.c
+++ b/servers/pm/time.c
@@ -84,3 +84,20 @@ PUBLIC int do_times()
   return(OK);
 }
 
+/*===========================================================================*
+ *				do_gettimeofday				     *
+ *===========================================================================*/
+PUBLIC int do_gettimeofday(void)
+{
+  clock_t uptime;
+  int s;
+
+  if ( (s=sys_getuptime(&uptime)) != OK) 
+  	panic(__FILE__,"do_gettimeofday couldn't get uptime", s);
+
+  mp->mp_reply.m2_l1 = boottime + uptime/HZ;
+  mp->mp_reply.m2_l2 = (uptime%HZ)*1000000/HZ;
+
+  return(OK);
+}
+