Squash commits for public release

test/kernel/fs/fourfiles/main.c

@@ -0,0 +1,67 @@
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+char buf[512];
+
+int main(int argc, char** argv)
+{
+    int fd, pid, i, j, n, total, pi;
+    char* names[] = { "f0.e", "f1.e", "f2.e", "f3.e" };
+    char* fname;
+    int pids[4];
+
+    for (pi = 0; pi < 4; pi++) {
+        fname = names[pi];
+        unlink(fname);
+
+        pid = fork();
+        pids[pi] = pid;
+        if (pid < 0) {
+            TestErr("fork failed");
+        }
+
+        if (pid == 0) {
+            fd = open(fname, O_CREAT | O_RDWR, 0600);
+            if (fd < 0) {
+                TestErr("create failed");
+            }
+
+            memset(buf, '0' + pi, 512);
+            for (i = 0; i < 12; i++) {
+                if ((n = write(fd, buf, 500)) != 500) {
+                    TestErr("write failed");
+                }
+            }
+            exit(0);
+        }
+    }
+
+    for (pi = 0; pi < 4; pi++) {
+        wait(pids[pi]);
+    }
+
+    for (i = 0; i < 4; i++) {
+        fname = names[i];
+        fd = open(fname, O_RDONLY);
+        total = 0;
+        while ((n = read(fd, buf, sizeof(buf))) > 0) {
+            for (j = 0; j < n; j++) {
+                if (buf[j] != '0' + i) {
+                    TestErr("wrong char");
+                }
+            }
+            total += n;
+        }
+        close(fd);
+        if (total != 12 * 500) {
+            TestErr("wrong length");
+        }
+        unlink(fname);
+    }
+
+    return 0;
+}