ref: 4959ae65d686d2ad095cff104428040f65bb05fa
parent: c1c79f43a6084eddc83de124b371a8b689e310a6
author: Naveen Narayanan <zerous@simple-cc.org>
date: Thu Aug 20 08:38:41 EDT 2020
libc: Implement clock (linux/amd64)
--- a/include/bits/amd64/arch/time.h
+++ b/include/bits/amd64/arch/time.h
@@ -1,3 +1,4 @@
#define _MAXYEAR 9999
+#define CLOCKS_PER_SEC 128
typedef long time_t;
--- a/include/time.h
+++ b/include/time.h
@@ -7,8 +7,6 @@
#include <arch/cdefs.h>
#include <arch/time.h>
-#define CLOCKS_PER_SEC 1000000
-
typedef long int clock_t;
struct tm {--- a/src/libc/arch/amd64/linux/Makefile
+++ b/src/libc/arch/amd64/linux/Makefile
@@ -15,6 +15,7 @@
_brk.$O\
_gettimeofday.$O\
_sigaction.$O\
+ _getrusage.$O\
_unlink.$O\
GENSRC = $(GENOBJS:.$O=.s)
@@ -25,6 +26,7 @@
raise.$O\
signal.$O\
time.$O\
+ clock.$O\
_cerrno.$O\
_getheap.$O\
_tzone.$O\
--- /dev/null
+++ b/src/libc/arch/amd64/linux/clock.c
@@ -1,0 +1,1 @@
+#include "../../posix/clock.c"
--- a/src/libc/arch/amd64/linux/syscall.lst
+++ b/src/libc/arch/amd64/linux/syscall.lst
@@ -11,3 +11,4 @@
62 _kill
87 _unlink
96 _gettimeofday
+98 _getrusage
--- /dev/null
+++ b/src/libc/arch/posix/clock.c
@@ -1,0 +1,22 @@
+#include "clock.h"
+
+extern int _getrusage(int, struct rusage*);
+
+static clock_t
+convtick(struct rusage r)
+{+ return r.ru_utime.tv_sec*CLOCKS_PER_SEC +
+ r.ru_stime.tv_usec / (1000000 / CLOCKS_PER_SEC);
+}
+
+
+clock_t
+clock(void)
+{+ struct rusage ru;
+ clock_t c;
+
+ if (_getrusage(RUSAGE_SELF, &ru))
+ return ((clock_t) -1);
+ return convtick(ru);
+}
--- /dev/null
+++ b/src/libc/arch/posix/clock.h
@@ -1,0 +1,34 @@
+#ifndef CLOCK_H
+#define CLOCK_H
+
+#include <time.h>
+
+#define RUSAGE_SELF 0
+
+typedef long int clock_t;
+
+struct timeval {+ long int tv_sec;
+ long int tv_usec;
+};
+
+struct rusage {+ struct timeval ru_utime;
+ struct timeval ru_stime;
+ long int ru_maxrss;
+ long int ru_ixrss;
+ long int ru_idrss;
+ long int ru_isrss;
+ long int ru_minflt;
+ long int ru_majflt;
+ long int ru_nswap;
+ long int ru_inblock;
+ long int ru_oublock;
+ long int ru_msgsnd;
+ long int ru_msgrcv;
+ long int ru_nsignals;
+ long int ru_nvcsw;
+ long int ru_nivcsw;
+};
+
+#endif