Tarball conversion

1 files changed, 117 insertions, 0 deletions

diff --git a/docs/programmer_reference/writetest.cs b/docs/programmer_reference/writetest.cs
new file mode 100644
index 00000000..471a893a
--- /dev/null
+++ b/docs/programmer_reference/writetest.cs
@@ -0,0 +1,117 @@
+/*
+ * writetest --
+ *
+ */
+#include <sys/types.h>
+#include <sys/time.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+void usage(void);
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	struct timeval start_time, end_time;
+	double usecs;
+	long val;
+	int bytes, ch, cnt, fd, ops;
+	char *fname, buf[100 * 1024];
+
+	bytes = 256;
+	fname = "testfile";
+	ops = 1000;
+	while ((ch = getopt(argc, argv, "b:f:o:")) != EOF)
+		switch (ch) {
+		case 'b':
+			if ((bytes = atoi(optarg)) > sizeof(buf)) {
+				fprintf(stderr,
+				    "max -b option %d\n", sizeof(buf));
+				exit (1);
+			}
+			break;
+		case 'f':
+			fname = optarg;
+			break;
+		case 'o':
+			if ((ops = atoi(optarg)) <= 0) {
+				fprintf(stderr, "illegal -o option value\n");
+				exit (1);
+			}
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	(void)unlink(fname);
+	if ((fd = open(fname, O_RDWR | O_CREAT, 0666)) == -1) {
+		perror(fname);
+		exit (1);
+	}
+
+	memset(buf, 0, bytes);
+
+	printf("Running: %d ops\n", ops);
+
+	(void)gettimeofday(&start_time, NULL);
+	for (cnt = 0; cnt < ops; ++cnt) {
+		if (write(fd, buf, bytes) != bytes) {
+			fprintf(stderr, "write: %s\n", strerror(errno));
+			exit (1);
+		}
+		if (lseek(fd, (off_t)0, SEEK_SET) == -1) {
+			fprintf(stderr, "lseek: %s\n", strerror(errno));
+			exit (1);
+		}
+		if (fsync(fd) != 0) {
+			fprintf(stderr, "fsync: %s\n", strerror(errno));
+			exit (1);
+		}
+	}
+	(void)gettimeofday(&end_time, NULL);
+
+	/*
+	 * Guarantee end_time fields are greater than or equal to start_time
+	 * fields.
+	 */
+	if (end_time.tv_sec > start_time.tv_sec) {
+		--end_time.tv_sec;
+		end_time.tv_usec += 1000000;
+	}
+
+	/* Display elapsed time. */
+	val = end_time.tv_sec - start_time.tv_sec;
+	printf("Elapsed time: %ld:", val / (60 * 60));
+	val %= 60 * 60;
+	printf("%ld:", val / 60);
+	val %= 60;
+	printf("%ld.%ld\n", val, end_time.tv_usec - start_time.tv_usec);
+
+	/* Display operations per second. */
+	usecs =
+	    (end_time.tv_sec - start_time.tv_sec) * 1000000 +
+	    (end_time.tv_usec - start_time.tv_usec);
+	printf("%d operations: %7.2f operations per second\n",
+	    ops, (ops / usecs) * 1000000);
+
+	(void)unlink(fname);
+	exit (0);
+}
+
+void
+usage()
+{
+	(void)fprintf(stderr,
+	    "usage: testfile [-b bytes] [-f file] [-o ops]\n");
+	exit(1);
+}