[FFmpeg-devel] [PATCH v3 2/2] lavf/file: Add support for file syncing.

[Andrey Semashev]

This commit adds support for IO synchronization API to the file backend.
---
 libavformat/file.c       | 11 +++++++++++
 libavformat/os_support.h |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/libavformat/file.c b/libavformat/file.c
index 1d321c4205..58fd55b928 100644
--- a/libavformat/file.c
+++ b/libavformat/file.c
@@ -254,6 +254,16 @@ static int64_t file_seek(URLContext *h, int64_t pos, int whence)
     return ret < 0 ? AVERROR(errno) : ret;
 }
 
+static int file_sync(URLContext *h)
+{
+    if (h->flags & AVIO_FLAG_WRITE) {
+        FileContext *c = h->priv_data;
+        if (fsync(c->fd) < 0)
+            return AVERROR(errno);
+    }
+    return 0;
+}
+
 static int file_close(URLContext *h)
 {
     FileContext *c = h->priv_data;
@@ -353,6 +363,7 @@ const URLProtocol ff_file_protocol = {
     .url_close           = file_close,
     .url_get_file_handle = file_get_handle,
     .url_check           = file_check,
+    .url_sync            = file_sync,
     .url_delete          = file_delete,
     .url_move            = file_move,
     .priv_data_size      = sizeof(FileContext),
diff --git a/libavformat/os_support.h b/libavformat/os_support.h
index 7a56dc9a7c..1864763cb1 100644
--- a/libavformat/os_support.h
+++ b/libavformat/os_support.h
@@ -93,6 +93,8 @@ static inline int is_dos_path(const char *path)
 #ifndef S_IWUSR
 #define S_IWUSR S_IWRITE
 #endif
+
+#define fsync(fd) _commit((fd))
 #endif
 
 #if CONFIG_NETWORK
-- 
2.19.1