subprocess: add a callback to ignore output

This callback is equivalent to shoving data into /dev/null.

2 files changed, 6 insertions, 0 deletions

diff --git a/osdep/subprocess.c b/osdep/subprocess.c
index dbd6100d2c..bc18f44652 100644
--- a/osdep/subprocess.c
+++ b/osdep/subprocess.c
@@ -45,6 +45,10 @@ static void *run_subprocess(void *ptr)
     return NULL;
 }
 
+void mp_devnull(void *ctx, char *data, size_t size)
+{
+}
+
 void mp_subprocess_detached(struct mp_log *log, char **args)
 {
     struct subprocess_args *p = talloc_zero(NULL, struct subprocess_args);
diff --git a/osdep/subprocess.h b/osdep/subprocess.h
index a32e7911c8..f272e1ad42 100644
--- a/osdep/subprocess.h
+++ b/osdep/subprocess.h
@@ -24,6 +24,8 @@ struct mp_cancel;
 
 typedef void (*subprocess_read_cb)(void *ctx, char *data, size_t size);
 
+void mp_devnull(void *ctx, char *data, size_t size);
+
 // Start a subprocess. Uses callbacks to read from stdout and stderr.
 int mp_subprocess(char **args, struct mp_cancel *cancel, void *ctx,
                   subprocess_read_cb on_stdout, subprocess_read_cb on_stderr,