Extract process-management functionality into a new lib/process

Note that procmon does *not* go here, since procmon needs to
integrate with the event loop.

1 files changed, 29 insertions, 0 deletions

diff --git a/src/lib/process/waitpid.h b/src/lib/process/waitpid.h
new file mode 100644
index 0000000000..85905da6bf
--- /dev/null
+++ b/src/lib/process/waitpid.h
@@ -0,0 +1,29 @@
+/* Copyright (c) 2011-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * \file waitpid.h
+ * \brief Headers for waitpid.c
+ **/
+
+#ifndef TOR_WAITPID_H
+#define TOR_WAITPID_H
+
+#ifndef _WIN32
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+/** A callback structure waiting for us to get a SIGCHLD informing us that a
+ * PID has been closed. Created by set_waitpid_callback. Cancelled or cleaned-
+ * up from clear_waitpid_callback().  Do not access outside of the main thread;
+ * do not access from inside a signal handler. */
+typedef struct waitpid_callback_t waitpid_callback_t;
+
+waitpid_callback_t *set_waitpid_callback(pid_t pid,
+                                         void (*fn)(int, void *), void *arg);
+void clear_waitpid_callback(waitpid_callback_t *ent);
+void notify_pending_waitpid_callbacks(void);
+#endif /* !defined(_WIN32) */
+
+#endif /* !defined(TOR_WAITPID_H) */