Add time(1).

utils/.gitignore

@@ -27,6 +27,7 @@ rm
 rmdir
 sh
 tail
+time
 type
 uname
 uptime

utils/Makefile

@@ -44,6 +44,7 @@ rmdir \
 sh \
 tail \
 type \
+time \
 uname \
 uptime \
 which \

utils/time.cpp

@@ -0,0 +1,66 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+    This program is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    This program is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+    more details.
+
+    You should have received a copy of the GNU General Public License along with
+    this program. If not, see <http://www.gnu.org/licenses/>.
+
+    time.cpp
+    Measure process running time.
+
+*******************************************************************************/
+
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <error.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <timespec.h>
+#include <unistd.h>
+
+int main(int argc, char* argv[])
+{
+	struct timespec start_time;
+	clock_gettime(CLOCK_MONOTONIC, &start_time);
+	pid_t child_pid = fork();
+	if ( child_pid < 0 )
+		error(1, errno, "fork");
+	if ( !child_pid )
+	{
+		if ( argc <= 1 )
+			exit(0);
+		execvp(argv[1], argv+1);
+		error(127, errno, "%s", argv[1]);
+	}
+	int exit_status = 0;
+	waitpid(child_pid, &exit_status, 0);
+
+	struct timespec end_time;
+	clock_gettime(CLOCK_MONOTONIC, &end_time);
+	struct tmns tmns;
+	timens(&tmns);
+	struct timespec real_time = timespec_sub(end_time, start_time);
+	struct timespec execute_time = timespec_sub(tmns.tmns_cutime, tmns.tmns_utime);
+	struct timespec system_time = timespec_sub(tmns.tmns_cstime, tmns.tmns_stime);
+	struct timespec user_time = timespec_sub(execute_time, system_time);
+
+	fprintf(stderr, "\n");
+	fprintf(stderr, "real\t%lim%li.%03li\n", (long) real_time.tv_sec / 60, (long) real_time.tv_sec % 60, real_time.tv_nsec / 1000000L);
+	fprintf(stderr, "user\t%lim%li.%03li\n", (long) user_time.tv_sec / 60, (long) user_time.tv_sec % 60, user_time.tv_nsec / 1000000);
+	fprintf(stderr, "sys\t%lim%li.%03li\n", (long) system_time.tv_sec / 60, (long) system_time.tv_sec % 60, system_time.tv_nsec / 1000000);
+
+	return WEXITSTATUS(exit_status);
+}