cleanup.c

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/* -*- c-file-style: "linux" -*-

   Copyright (C) 1996-2000 by Andrew Tridgell
   Copyright (C) Paul Mackerras 1996
   Copyright (C) 2002 by Martin Pool

   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "rsync.h"

extern int io_error;
extern int keep_partial;
extern int log_got_error;
extern char *partial_dir;

#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 char *cleanup_fname;
static 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.
 **/
void _exit_cleanup(int code, const char *file, int line)
{
        int ocode = code;
        static int inside_cleanup = 0;

        if (inside_cleanup > 10) {
                /* prevent the occasional infinite recursion */
                return;
        }
        inside_cleanup++;

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

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

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

        if (cleanup_got_literal && cleanup_fname && keep_partial
            && handle_partial_dir(cleanup_new_fname, PDIR_CREATE)) {
                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,
                                cleanup_file, 0, !partial_dir);
        }
        io_flush(FULL_FLUSH);
        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 = RERR_DEL_LIMIT;
                if (io_error & IOERR_VANISHED)
                        code = RERR_VANISHED;
                if (io_error & IOERR_GENERAL || log_got_error)
                        code = RERR_PARTIAL;
        }

        if (code)
                log_exit(code, file, line);

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

        close_all();
        exit(code);
}

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


void cleanup_set(char *fnametmp, char *fname, struct file_struct *file,
                 int fd_r, int fd_w)
{
        cleanup_fname = fname ? fnametmp : NULL;
        cleanup_new_fname = fname;
        cleanup_file = file;
        cleanup_fd_r = fd_r;
        cleanup_fd_w = fd_w;
}

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

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