rsync/cleanup.c

/*
 * End-of-run cleanup routines.
 *
 * Copyright (C) 1996-2000 Andrew Tridgell
 * Copyright (C) 1996 Paul Mackerras
 * Copyright (C) 2002 Martin Pool
 * Copyright (C) 2003-2009 Wayne Davison
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, visit the http://fsf.org website.
 */

#include "rsync.h"

extern int am_server;
extern int am_daemon;
extern int am_receiver;
extern int io_error;
extern int keep_partial;
extern int got_xfer_error;
extern char *partial_dir;
extern char *logfile_name;

#ifdef HAVE_SIGACTION
static struct sigaction sigact;
#endif

/**
 * Close all open sockets and files, allowing a (somewhat) graceful
 * shutdown() of socket connections.  This eliminates the abortive
 * TCP RST sent by a Winsock-based system when the close() occurs.
 **/
void close_all(void)
{
#ifdef SHUTDOWN_ALL_SOCKETS
	int max_fd;
	int fd;
	int ret;
	STRUCT_STAT st;

	max_fd = sysconf(_SC_OPEN_MAX) - 1;
	for (fd = max_fd; fd >= 0; fd--) {
		if ((ret = do_fstat(fd, &st)) == 0) {
			if (is_a_socket(fd))
				ret = shutdown(fd, 2);
			ret = close(fd);
		}
	}
#endif
}

/**
 * @file cleanup.c
 *
 * Code for handling interrupted transfers.  Depending on the @c
 * --partial option, we may either delete the temporary file, or go
 * ahead and overwrite the destination.  This second behaviour only
 * occurs if we've sent literal data and therefore hopefully made
 * progress on the transfer.
 **/

/**
 * Set to True once literal data has been sent across the link for the
 * current file. (????)
 *
 * Handling the cleanup when a transfer is interrupted is tricky when
 * --partial is selected.  We need to ensure that the partial file is
 * kept if any real data has been transferred.
 **/
int cleanup_got_literal = 0;

static const char *cleanup_fname;
static const char *cleanup_new_fname;
static struct file_struct *cleanup_file;
static int cleanup_fd_r, cleanup_fd_w;
static pid_t cleanup_pid = 0;

pid_t cleanup_child_pid = -1;

/**
 * Eventually calls exit(), passing @p code, therefore does not return.
 *
 * @param code one of the RERR_* codes from errcode.h.
 **/
NORETURN void _exit_cleanup(int code, const char *file, int line)
{
	static int switch_step = 0;
	static int exit_code = 0, exit_line = 0;
	static const char *exit_file = NULL;
	static int unmodified_code = 0;

	SIGACTION(SIGUSR1, SIG_IGN);
	SIGACTION(SIGUSR2, SIG_IGN);

	if (exit_code) { /* Preserve first exit info when recursing. */
		code = exit_code;
		file = exit_file;
		line = exit_line;
	}

	/* If this is the exit at the end of the run, the server side
	 * should not attempt to output a message (see log_exit()). */
	if (am_server && code == 0)
		am_server = 2;

	/* Some of our actions might cause a recursive call back here, so we
	 * keep track of where we are in the cleanup and never repeat a step. */
	switch (switch_step) {
#include "case_N.h" /* case 0: */
		switch_step++;

		exit_code = unmodified_code = code;
		exit_file = file;
		exit_line = line;

		if (verbose > 3) {
			rprintf(FINFO,
				"[%s] _exit_cleanup(code=%d, file=%s, line=%d): entered\n",
				who_am_i(), code, file, line);
		}

		/* FALLTHROUGH */
#include "case_N.h"
		switch_step++;

		if (cleanup_child_pid != -1) {
			int status;
			int pid = wait_process(cleanup_child_pid, &status, WNOHANG);
			if (pid == cleanup_child_pid) {
				status = WEXITSTATUS(status);
				if (status > code)
					code = exit_code = status;
			}
		}

		/* FALLTHROUGH */
#include "case_N.h"
		switch_step++;

		if (cleanup_got_literal && cleanup_fname && cleanup_new_fname
		 && keep_partial && handle_partial_dir(cleanup_new_fname, PDIR_CREATE)) {
			const char *fname = cleanup_fname;
			cleanup_fname = NULL;
			if (cleanup_fd_r != -1)
				close(cleanup_fd_r);
			if (cleanup_fd_w != -1) {
				flush_write_file(cleanup_fd_w);
				close(cleanup_fd_w);
			}
			finish_transfer(cleanup_new_fname, fname, NULL, NULL,
					cleanup_file, 0, !partial_dir);
		}

		/* FALLTHROUGH */
#include "case_N.h"
		switch_step++;

		if (!code || am_server || am_receiver)
			io_flush(FULL_FLUSH);

		/* FALLTHROUGH */
#include "case_N.h"
		switch_step++;

		if (cleanup_fname)
			do_unlink(cleanup_fname);
		if (code)
			kill_all(SIGUSR1);
		if (cleanup_pid && cleanup_pid == getpid()) {
			char *pidf = lp_pid_file();
			if (pidf && *pidf)
				unlink(lp_pid_file());
		}

		if (code == 0) {
			if (io_error & IOERR_DEL_LIMIT)
				code = exit_code = RERR_DEL_LIMIT;
			if (io_error & IOERR_VANISHED)
				code = exit_code = RERR_VANISHED;
			if (io_error & IOERR_GENERAL || got_xfer_error)
				code = exit_code = RERR_PARTIAL;
		}

		if (code || am_daemon || (logfile_name && (am_server || !verbose)))
			log_exit(code, file, line);

		/* FALLTHROUGH */
#include "case_N.h"
		switch_step++;

		if (verbose > 2) {
			rprintf(FINFO,
				"[%s] _exit_cleanup(code=%d, file=%s, line=%d): "
				"about to call exit(%d)\n",
				who_am_i(), unmodified_code, file, line, code);
		}

		/* FALLTHROUGH */
#include "case_N.h"
		switch_step++;

		if (am_server && code)
			msleep(100);
		close_all();

		/* FALLTHROUGH */
	default:
		break;
	}

	exit(code);
}

void cleanup_disable(void)
{
	cleanup_fname = cleanup_new_fname = NULL;
	cleanup_got_literal = 0;
}


void cleanup_set(const char *fnametmp, const char *fname, struct file_struct *file,
		 int fd_r, int fd_w)
{
	cleanup_fname = fnametmp;
	cleanup_new_fname = fname; /* can be NULL on a partial-dir failure */
	cleanup_file = file;
	cleanup_fd_r = fd_r;
	cleanup_fd_w = fd_w;
}

void cleanup_set_pid(pid_t pid)
{
	cleanup_pid = pid;
}