Initial revision

1 files changed, 51 insertions, 0 deletions

diff --git a/benchmarks/forks.c b/benchmarks/forks.c
new file mode 100644
index 00000000..ae9efaab
--- /dev/null
+++ b/benchmarks/forks.c
@@ -0,0 +1,51 @@
+/* From 4.4 BSD sys/tests/benchmarks/forks.c. */
+
+/*
+ * Benchmark program to calculate fork+wait
+ * overhead (approximately).  Process
+ * forks and exits while parent waits.
+ * The time to run this program is used
+ * in calculating exec overhead.
+ */
+
+main(argc, argv)
+	char *argv[];
+{
+	register int nforks, i;
+	char *cp;
+	int pid, child, status, brksize;
+
+	if (argc < 2) {
+		printf("usage: %s number-of-forks sbrk-size\n", argv[0]);
+		exit(1);
+	}
+	nforks = atoi(argv[1]);
+	if (nforks < 0) {
+		printf("%s: bad number of forks\n", argv[1]);
+		exit(2);
+	}
+	brksize = atoi(argv[2]);
+	if (brksize < 0) {
+		printf("%s: bad size to sbrk\n", argv[2]);
+		exit(3);
+	}
+	cp = (char *)sbrk(brksize);
+	if ((int)cp == -1) {
+		perror("sbrk");
+		exit(4);
+	}
+	for (i = 0; i < brksize; i += 1024)
+		cp[i] = i;
+	while (nforks-- > 0) {
+		child = fork();
+		if (child == -1) {
+			perror("fork");
+			exit(-1);
+		}
+		if (child == 0)
+			_exit(-1);
+		while ((pid = wait(&status)) != -1 && pid != child)
+			;
+	}
+	exit(0);
+}