From: Timo Sirainen <timo.sirainen@open-xchange.com>
Date: Mon, 8 Mar 2021 14:33:33 +0000 (+0200)
Subject: lib: Add i_stream_copy_fd()
X-Git-Tag: 2.3.16~142
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c8a9ccc5aa5773e60021482c954e3779f33f2be2;p=thirdparty%2Fdovecot%2Fcore.git

lib: Add i_stream_copy_fd()
---

diff --git a/src/lib/istream.c b/src/lib/istream.c
index 32ee3cee98..93c5703470 100644
--- a/src/lib/istream.c
+++ b/src/lib/istream.c
@@ -88,6 +88,16 @@ int i_stream_get_fd(struct istream *stream)
 	return _stream->fd;
 }
 
+void i_stream_copy_fd(struct istream *dest, struct istream *source)
+{
+	int fd = i_stream_get_fd(source);
+
+	i_assert(fd != -1);
+	i_assert(dest->real_stream->fd == -1);
+	dest->real_stream->fd = fd;
+	dest->readable_fd = source->readable_fd;
+}
+
 const char *i_stream_get_error(struct istream *stream)
 {
 	struct istream *s;
diff --git a/src/lib/istream.h b/src/lib/istream.h
index 2ea9601463..ed3d793cd0 100644
--- a/src/lib/istream.h
+++ b/src/lib/istream.h
@@ -97,6 +97,10 @@ void i_stream_remove_destroy_callback(struct istream *stream,
 
 /* Return file descriptor for stream, or -1 if none is available. */
 int i_stream_get_fd(struct istream *stream);
+/* Copy the file descriptor from source istream to destination istream.
+   The readable_fd is preserved. Assert-crashes if source doesn't have a
+   file descriptor. */
+void i_stream_copy_fd(struct istream *dest, struct istream *source);
 /* Returns error string for the last error. It also returns "EOF" in case there
    is no error, but eof is set. Otherwise it returns "<no error>". */
 const char *i_stream_get_error(struct istream *stream);