libxenlight: initial libxenlight implementation under tools/libxl

Signed-off-by: Vincent Hanquez <Vincent.Hanquez@eu.citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/tools/libxl/libxl_exec.c b/tools/libxl/libxl_exec.c
new file mode 100644
index 0000000000..8d7928b4e8
--- /dev/null
+++ b/tools/libxl/libxl_exec.c
@@ -0,0 +1,48 @@
+
+/*
+ * Copyright (C) 2009      Citrix Ltd.
+ * Author Vincent Hanquez <vincent.hanquez@eu.citrix.com>
+ * Author Stefano Stabellini <stefano.stabellini@eu.citrix.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include "libxl.h"
+#include "libxl_internal.h"
+
+int libxl_exec(struct libxl_ctx *ctx, int stdinfd, int stdoutfd, int stderrfd,
+               char *arg0, char **args)
+{
+    int pid, i;
+
+    pid = fork();
+    if (pid == -1) {
+        XL_LOG(ctx, XL_LOG_ERROR, "fork failed");
+        return -1;
+    }
+    if (pid == 0) {
+        /* child */
+        if (stdinfd != -1)
+            dup2(stdinfd, STDIN_FILENO);
+        if (stdoutfd != -1)
+            dup2(stdoutfd, STDOUT_FILENO);
+        if (stderrfd != -1)
+            dup2(stderrfd, STDERR_FILENO);
+        for (i = 4; i < 256; i++)
+            close(i);
+        execv(arg0, args);
+        exit(256);
+    }
+    return pid;
+}