evl/proxy: introduce file proxy interface

include/evenless/evl.h

@@ -17,6 +17,7 @@
 #include <evenless/thread.h>
 #include <evenless/xbuf.h>
 #include <evenless/poll.h>
+#include <evenless/proxy.h>
 
 #define __EVL__  0	/* API revision */
 

include/evenless/proxy.h

@@ -0,0 +1,25 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 Philippe Gerum  <rpm@xenomai.org>
+ */
+
+#ifndef _EVENLESS_PROXY_H
+#define _EVENLESS_PROXY_H
+
+#include <sys/types.h>
+#include <linux/types.h>
+#include <uapi/evenless/proxy.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int evl_new_proxy(int fd, size_t bufsz,
+		const char *fmt, ...);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _EVENLESS_PROXY_H */

lib/proxy.c

@@ -0,0 +1,35 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 Philippe Gerum  <rpm@xenomai.org>
+ */
+
+#include <stdarg.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <evenless/proxy.h>
+#include <evenless/syscall.h>
+#include "internal.h"
+
+int evl_new_proxy(int fd, size_t bufsz, const char *fmt, ...)
+{
+	struct evl_proxy_attrs attrs;
+	int ret, efd;
+	va_list ap;
+	char *name;
+
+	va_start(ap, fmt);
+	ret = vasprintf(&name, fmt, ap);
+	va_end(ap);
+	if (ret < 0)
+		return -ENOMEM;
+
+	attrs.fd = fd;
+	attrs.bufsz = bufsz;
+	efd = create_evl_element("proxy", name, &attrs, NULL);
+	free(name);
+
+	return efd;
+}