coreutils

time: Add POSIX time

Diffstat

3 files changed, 121 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3660de4..6590661 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,6 +32,7 @@ ADD_EXECUTABLE(rmdir    ${CMAKE_SOURCE_DIR}/src/rmdir.c)
 ADD_EXECUTABLE(sleep    ${CMAKE_SOURCE_DIR}/src/sleep.c)
 ADD_EXECUTABLE(sync     ${CMAKE_SOURCE_DIR}/src/sync.c)
 ADD_EXECUTABLE(tee      ${CMAKE_SOURCE_DIR}/src/tee.c)
+ADD_EXECUTABLE(time     ${CMAKE_SOURCE_DIR}/src/time.c)
 ADD_EXECUTABLE(touch    ${CMAKE_SOURCE_DIR}/src/touch.c)
 ADD_EXECUTABLE(true     ${CMAKE_SOURCE_DIR}/src/true.c)
 ADD_EXECUTABLE(tty      ${CMAKE_SOURCE_DIR}/src/tty.c)
diff --git a/README.md b/README.md
index e007a0c..09b1ae7 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ UNIX-like systems.
 | sleep            | Suspend execution for an interval        | POSIX    |
 | sync             | Synchronise file system caches to disk   |          |
 | tee              | Duplicate standard input                 | POSIX    |
+| time             | Time a simple command                    | POSIX    |
 | touch            | Change file access and modify times      | POSIX    |
 | true             | Return true value                        | POSIX    |
 | tty              | Return user's terminal name              | POSIX    |
diff --git a/src/time.c b/src/time.c
new file mode 100644
index 0000000..83d281c
--- /dev/null
+++ b/src/time.c
@@ -0,0 +1,119 @@
+// time.c, version 1.0.0
+// OMKOV coreutils implementation of POSIX time
+// Copyright (C) 2020, Jakob Wakeling
+// All rights reserved.
+
+/*
+OMKOV Permissive Licence, version 1.0
+
+Copyright (C) 2020, Jakob Wakeling
+All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal with
+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:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimers.
+* Redistributions in binary form must reproduce the above copyright notice, this
+  list of conditions and the following disclaimers in the documentation and/or
+  other materials provided with the distribution.
+* Neither the names of the copyright holders, nor the names of its contributors
+  may be used to endorse or promote products derived from this Software without
+  specific prior written permission.
+
+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 COPYRIGHT
+HOLDERS OR CONTRIBUTORS 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 WITH THE SOFTWARE.
+*/
+
+#include "error.h"
+#include "optget.h"
+
+#include <sys/times.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+
+#define VERSION "1.0.0"
+
+static bool pflag;
+
+static inline void help(void);
+static inline void version(void);
+
+int main(int ac, char *av[]) {
+	lop_t lops[] = {
+		{ "help",    ARG_NUL, 256 },
+		{ "version", ARG_NUL, 257 },
+		{ NULL, 0, 0 }
+	};
+	
+	opt_t opt = OPTGET_INIT; opt.str = "p"; opt.lops = lops; int o;
+	while ((o = optget(&opt, av, 0)) != -1) switch (o) {
+	case 'p': { pflag = true; break; }
+	case 256: { help(); return 0; }
+	case 257: { version(); return 0; }
+	default: { return 1; }
+	}
+	
+	struct tms tm; clock_t cl = times(&tm);
+	
+	pid_t pid = fork();
+	if (pid == -1) { error(1, "%s: %s", av[0]); }
+	else if (pid == 0) { 
+		execvp(av[opt.ind], &av[opt.ind]);
+		warn("%s: %s: %s", av[0], av[opt.ind], serrno);
+		return errno = ENOENT ? 127 : 126;
+	}
+	
+	int status; waitpid(pid, &status, 0);
+	cl = times(&tm) - cl;
+	
+	double tick = (double)sysconf(_SC_CLK_TCK);
+	double real = (double)cl / tick;
+	double user = (double)(tm.tms_utime + tm.tms_cutime) / tick;
+	double sys  = (double)(tm.tms_stime + tm.tms_cstime) / tick;
+	
+	if (pflag) {
+		fprintf(stderr, "real %0.2f\n", real);
+		fprintf(stderr, "user %0.2f\n", user);
+		fprintf(stderr, "sys %0.2f\n", sys);
+	}
+	else {
+		fprintf(stderr, "real  %0.2fs\n", real);
+		fprintf(stderr, "user  %0.2fs\n", user);
+		fprintf(stderr, "sys   %0.2fs\n", sys);
+	}
+	
+	return WEXITSTATUS(status);
+}
+
+static inline void help(void) {
+	puts("time - time a simple command\n");
+	puts("usage: time [-p] command [argument...]\n");
+	puts("options:");
+	puts("  -p            Use portable format");
+	puts("  --help        Display help information");
+	puts("  --version     Display version information");
+	return;
+}
+
+static inline void version() {
+	puts("OMKOV coreutils time, version " VERSION);
+	puts("Copyright (C) 2020, Jakob Wakeling");
+	puts("All rights reserved.");
+	puts("OMKOV Permissive Licence (https://www.omkov.net/OLPE)");
+	return;
+}