[libav-devel] [PATCH 3/8] file: Add an option for following a file that is being written

[Martin Storsjö]

Using this requires setting the rw_timeout option to make it
terminate, alternatively using the interrupt callback (if used via
the API).
---
 libavformat/file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/file.c b/libavformat/file.c
index 4f581cf..8683c1b 100644
--- a/libavformat/file.c
+++ b/libavformat/file.c
@@ -42,10 +42,12 @@ typedef struct FileContext {
     const AVClass *class;
     int fd;
     int trunc;
+    int follow;
 } FileContext;
 
 static const AVOption file_options[] = {
     { "truncate", "Truncate existing files on write", offsetof(FileContext, 
trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
+    { "follow", "Follow a file as it is being written", offsetof(FileContext, 
follow), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
     { NULL }
 };
 
@@ -60,6 +62,8 @@ static int file_read(URLContext *h, unsigned char *buf, int 
size)
 {
     FileContext *c = h->priv_data;
     int ret = read(c->fd, buf, size);
+    if (ret == 0 && c->follow)
+        return AVERROR(EAGAIN);
     return (ret == -1) ? AVERROR(errno) : ret;
 }
 
-- 
2.5.4 (Apple Git-61)

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