libcamera: process: Manage pipe fds by UniqueFD

Manages the file descriptors owned by Process for pipe by UniqueFDs.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

include/libcamera/internal/process.h

@@ -12,6 +12,7 @@
 #include <vector>
 
 #include <libcamera/base/signal.h>
+#include <libcamera/base/unique_fd.h>
 
 namespace libcamera {
 
@@ -75,8 +76,9 @@ private:
 	std::list<Process *> processes_;
 
 	struct sigaction oldsa_;
+
 	EventNotifier *sigEvent_;
-	int pipe_[2];
+	UniqueFD pipe_[2];
 };
 
 } /* namespace libcamera */