implement utilityHEADmaster

1 files changed, 111 insertions, 0 deletions

diff --git a/time.c b/time.c
new file mode 100644
index 0000000..389b50f
--- /dev/null
+++ b/time.c
@@ -0,0 +1,111 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2020, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define _XOPEN_SOURCE 700
+#include <errno.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <time.h>
+#include <sys/times.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#define UTILITY_NOT_INVOKED	(126)
+#define UTILITY_NOT_FOUND	(127)
+
+int main(int argc, char *argv[])
+{
+	setlocale(LC_ALL, "");
+
+	int c;
+	while ((c = getopt(argc, argv, "p")) != -1) {
+		switch (c) {
+		case 'p':
+			/* ignored, only use POSIX output format */
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (optind >= argc) {
+		fprintf(stderr, "time: missing operand\n");
+		return UTILITY_NOT_FOUND;
+	}
+
+	struct tms tmstart;
+	clock_t start = times(&tmstart);
+
+	/*
+	struct timespec start;
+	clock_gettime(CLOCK_MONOTONIC, &start);
+	*/
+
+	pid_t pid = fork();
+	if (pid == -1) {
+		perror("time");
+		return UTILITY_NOT_INVOKED;
+	}
+
+	if (pid == 0) {
+		execvp(argv[optind], argv + optind);
+		fprintf(stderr, "time: %s: %s\n", argv[optind], strerror(errno));
+		return errno == ENOENT ? UTILITY_NOT_FOUND : UTILITY_NOT_INVOKED;
+	}
+
+	int status;
+	waitpid(pid, &status, 0);
+
+	/*
+	struct timespec end;
+	clock_gettime(CLOCK_MONOTONIC, &end);
+	*/
+
+	struct tms tmend;
+	clock_t end = times(&tmend);
+
+	status = WEXITSTATUS(status);
+	if (status == UTILITY_NOT_FOUND || status == UTILITY_NOT_INVOKED) {
+		return status;
+	}
+
+	/*
+	double real = tstod(&end) - tstod(&start);
+	double user = (double)tms.tms_cutime / (double)CLOCKS_PER_SEC;
+	double sys = (double)tms.tms_cstime / (double)CLOCKS_PER_SEC;
+	*/
+
+	double ticks = (double)sysconf(_SC_CLK_TCK);
+	double real = (double)(end - start) / ticks;
+	double user = (double)(tmend.tms_cutime - tmstart.tms_cutime) / ticks;
+	double sys = (double)(tmend.tms_cstime - tmstart.tms_cstime) / ticks;
+
+	fprintf(stderr, "real %.2f\n", real);
+	fprintf(stderr, "user %.2f\n", user);
+	fprintf(stderr, "sys %.2f\n", sys);
+	return status;
+}