1 files changed, 183 insertions, 0 deletions
diff --git a/fluent-bit/src/flb_pipe.c b/fluent-bit/src/flb_pipe.c
new file mode 100644
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+++ b/fluent-bit/src/flb_pipe.c
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+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2022 The Fluent Bit Authors
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+/*
+ * Fluent Bit core uses unnamed Unix pipes for signaling and general
+ * communication across components. When building on Windows this is
+ * problematic because Windows pipes are not selectable and only
+ * sockets are.
+ *
+ * This file aims to wrap around the required backend calls depending
+ * of the operating system.
+ *
+ * This file provides 4 interfaces:
+ *
+ * - flb_pipe_create          : create a pair of connected file descriptors or sockets.
+ * - flb_pipe_destroy         : destroy a pair of connected fds or sockets.
+ * - flb_pipe_close           : close individual end of a pipe.
+ * - flb_pipe_set_nonblocking : make a socket nonblocking
+ *
+ * we need to have a 'closer' handler because for Windows a file descriptor
+ * is not a socket.
+ */
+
+#include <fluent-bit/flb_compat.h>
+#include <fluent-bit/flb_pipe.h>
+#include <fluent-bit/flb_log.h>
+#include <fluent-bit/flb_time.h>
+
+#ifdef _WIN32
+
+/*
+ * Building on Windows means that Monkey library (lib/monkey) and it
+ * core runtime have been build with 'libevent' backend support, that
+ * library provide an abstraction to create a socketpairs.
+ *
+ * Creating a pipe on Fluent Bit @Windows, means create a socket pair.
+ */
+
+int flb_pipe_create(flb_pipefd_t pipefd[2])
+{
+    if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, pipefd) == -1) {
+        perror("socketpair");
+        return -1;
+    }
+
+    return 0;
+}
+
+void flb_pipe_destroy(flb_pipefd_t pipefd[2])
+{
+    evutil_closesocket(pipefd[0]);
+    evutil_closesocket(pipefd[1]);
+}
+
+int flb_pipe_close(flb_pipefd_t fd)
+{
+    return evutil_closesocket(fd);
+}
+
+int flb_pipe_set_nonblocking(flb_pipefd_t fd)
+{
+    return evutil_make_socket_nonblocking(fd);
+}
+#else
+/* All other flavors of Unix/BSD are OK */
+
+#include <stdint.h>
+#include <fcntl.h>
+
+int flb_pipe_create(flb_pipefd_t pipefd[2])
+{
+    return pipe(pipefd);
+}
+
+void flb_pipe_destroy(flb_pipefd_t pipefd[2])
+{
+    close(pipefd[0]);
+    close(pipefd[1]);
+}
+
+int flb_pipe_close(flb_pipefd_t fd)
+{
+    /* 
+     *  when chunk file is destroyed, the fd for file will be -1, we should avoid
+     *  deleting chunk file with fd -1
+     */
+    if (fd == -1) {
+        return -1;
+    }
+
+    return close(fd);
+}
+
+int flb_pipe_set_nonblocking(flb_pipefd_t fd)
+{
+    int flags = fcntl(fd, F_GETFL);
+    if (flags < 0)
+        return -1;
+    if (flags & O_NONBLOCK)
+        return 0;
+    return fcntl(fd, F_SETFL, flags | O_NONBLOCK);
+}
+#endif
+
+/* Blocking read until receive 'count' bytes */
+ssize_t flb_pipe_read_all(int fd, void *buf, size_t count)
+{
+    ssize_t bytes;
+    size_t total = 0;
+
+    do {
+        bytes = flb_pipe_r(fd, (char *) buf + total, count - total);
+        if (bytes == -1) {
+            if (FLB_PIPE_WOULDBLOCK()) {
+                /*
+                 * This could happen, since this function goal is not to
+                 * return until all data have been read, just sleep a little
+                 * bit (0.05 seconds)
+                 */
+                flb_time_msleep(50);
+                continue;
+            }
+            return -1;
+        }
+        else if (bytes == 0) {
+            /* Broken pipe ? */
+            flb_errno();
+            return -1;
+        }
+        total += bytes;
+
+    } while (total < count);
+
+    return total;
+}
+
+/* Blocking write until send 'count bytes */
+ssize_t flb_pipe_write_all(int fd, const void *buf, size_t count)
+{
+    ssize_t bytes;
+    size_t total = 0;
+
+    do {
+        bytes = flb_pipe_w(fd, (const char *) buf + total, count - total);
+        if (bytes == -1) {
+            if (FLB_PIPE_WOULDBLOCK()) {
+                /*
+                 * This could happen, since this function goal is not to
+                 * return until all data have been read, just sleep a little
+                 * bit (0.05 seconds)
+                 */
+                flb_time_msleep(50);
+                continue;
+            }
+            return -1;
+        }
+        else if (bytes == 0) {
+            /* Broken pipe ? */
+            flb_errno();
+            return -1;
+        }
+        total += bytes;
+
+    } while (total < count);
+
+    return total;
+}