/* Copyright (c) 2011-2020, 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) */
