LineageOS/android_external_rsync
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android_external_rsync/main.c

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/* -*- c-file-style: "linux" -*-
Copyright (C) 1996-2001 by Andrew Tridgell <tridge@samba.org>
Copyright (C) Paul Mackerras 1996
Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
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"
time_t starttime = 0;
extern struct stats stats;
extern char *files_from;
extern int filesfrom_fd;
extern char *remote_filesfrom_file;
extern int am_server;
extern int am_sender;
extern int am_daemon;
extern int verbose;
extern int protocol_version;
/* there's probably never more than at most 2 outstanding child processes,
* but set it higher just in case.
*/
#define MAXCHILDPROCS 5
struct pid_status {
pid_t pid;
int status;
} pid_stat_table[MAXCHILDPROCS];
static void show_malloc_stats(void);
/****************************************************************************
wait for a process to exit, calling io_flush while waiting
****************************************************************************/
void wait_process(pid_t pid, int *status)
{
pid_t waited_pid;
int cnt;
while ((waited_pid = waitpid(pid, status, WNOHANG)) == 0) {
msleep(20);
io_flush();
}
if ((waited_pid == -1) && (errno == ECHILD)) {
/* status of requested child no longer available.
* check to see if it was processed by the sigchld_handler.
*/
for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
if (pid == pid_stat_table[cnt].pid) {
*status = pid_stat_table[cnt].status;
pid_stat_table[cnt].pid = 0;
break;
}
}
}
/* TODO: If the child exited on a signal, then log an
* appropriate error message. Perhaps we should also accept a
* message describing the purpose of the child. Also indicate
* this to the caller so that thhey know something went
* wrong. */
*status = WEXITSTATUS(*status);
}
static void report(int f)
{
time_t t = time(NULL);
extern int do_stats;
int send_stats;
if (do_stats && verbose > 1) {
/* These come out from every process */
show_malloc_stats();
show_flist_stats();
}
if (am_daemon) {
log_exit(0, __FILE__, __LINE__);
if (f == -1 || !am_sender) return;
}
send_stats = verbose || protocol_version >= 20;
if (am_server) {
if (am_sender && send_stats) {
int64 w;
/* store total_written in a temporary
* because write_longint changes it */
w = stats.total_written;
write_longint(f,stats.total_read);
write_longint(f,w);
write_longint(f,stats.total_size);
}
return;
}
/* this is the client */
if (!am_sender && send_stats) {
int64 r;
stats.total_written = read_longint(f);
/* store total_read in a temporary, read_longint changes it */
r = read_longint(f);
stats.total_size = read_longint(f);
stats.total_read = r;
}
if (do_stats) {
if (!am_sender && !send_stats) {
/* missing the bytes written by the generator */
rprintf(FINFO, "\nCannot show stats as receiver because remote protocol version is less than 20\n");
rprintf(FINFO, "Use --stats -v to show stats\n");
return;
}
rprintf(FINFO,"\nNumber of files: %d\n", stats.num_files);
rprintf(FINFO,"Number of files transferred: %d\n",
stats.num_transferred_files);
rprintf(FINFO,"Total file size: %.0f bytes\n",
(double)stats.total_size);
rprintf(FINFO,"Total transferred file size: %.0f bytes\n",
(double)stats.total_transferred_size);
rprintf(FINFO,"Literal data: %.0f bytes\n",
(double)stats.literal_data);
rprintf(FINFO,"Matched data: %.0f bytes\n",
(double)stats.matched_data);
rprintf(FINFO,"File list size: %d\n", stats.flist_size);
rprintf(FINFO,"Total bytes written: %.0f\n",
(double)stats.total_written);
rprintf(FINFO,"Total bytes read: %.0f\n",
(double)stats.total_read);
}
if (verbose || do_stats) {
rprintf(FINFO,"\nwrote %.0f bytes read %.0f bytes %.2f bytes/sec\n",
(double)stats.total_written,
(double)stats.total_read,
(stats.total_written+stats.total_read)/(0.5 + (t-starttime)));
rprintf(FINFO,"total size is %.0f speedup is %.2f\n",
(double)stats.total_size,
(1.0*stats.total_size)/(stats.total_written+stats.total_read));
}
fflush(stdout);
fflush(stderr);
}
/**
* If our C library can get malloc statistics, then show them to FINFO
**/
static void show_malloc_stats(void)
{
#ifdef HAVE_MALLINFO
struct mallinfo mi;
mi = mallinfo();
rprintf(FINFO, "\n" RSYNC_NAME "[%d] (%s%s%s) heap statistics:\n",
getpid(),
am_server ? "server " : "",
am_daemon ? "daemon " : "",
am_sender ? "sender" : "receiver");
rprintf(FINFO, " arena: %10d (bytes from sbrk)\n", mi.arena);
rprintf(FINFO, " ordblks: %10d (chunks not in use)\n", mi.ordblks);
rprintf(FINFO, " smblks: %10d\n", mi.smblks);
rprintf(FINFO, " hblks: %10d (chunks from mmap)\n", mi.hblks);
rprintf(FINFO, " hblkhd: %10d (bytes from mmap)\n", mi.hblkhd);
rprintf(FINFO, " usmblks: %10d\n", mi.usmblks);
rprintf(FINFO, " fsmblks: %10d\n", mi.fsmblks);
rprintf(FINFO, " uordblks: %10d (bytes used)\n", mi.uordblks);
rprintf(FINFO, " fordblks: %10d (bytes free)\n", mi.fordblks);
rprintf(FINFO, " keepcost: %10d (bytes in releasable chunk)\n", mi.keepcost);
#endif /* HAVE_MALLINFO */
}
/* Start the remote shell. cmd may be NULL to use the default. */
static pid_t do_cmd(char *cmd,char *machine,char *user,char *path,int *f_in,int *f_out)
{
char *args[100];
int i,argc=0;
pid_t ret;
char *tok,*dir=NULL;
int dash_l_set = 0;
extern int local_server;
extern char *rsync_path;
extern int blocking_io;
extern int daemon_over_rsh;
extern int read_batch;
if (!read_batch && !local_server) {
char *rsh_env = getenv(RSYNC_RSH_ENV);
if (!cmd)
cmd = rsh_env;
if (!cmd)
cmd = RSYNC_RSH;
cmd = strdup(cmd);
if (!cmd)
goto oom;
for (tok=strtok(cmd," ");tok;tok=strtok(NULL," ")) {
args[argc++] = tok;
}
/* check to see if we've already been given '-l user' in
* the remote-shell command */
for (i = 0; i < argc-1; i++) {
if (!strcmp(args[i], "-l") && args[i+1][0] != '-')
dash_l_set = 1;
}
#if HAVE_REMSH
/* remsh (on HPUX) takes the arguments the other way around */
args[argc++] = machine;
if (user && !(daemon_over_rsh && dash_l_set)) {
args[argc++] = "-l";
args[argc++] = user;
}
#else
if (user && !(daemon_over_rsh && dash_l_set)) {
args[argc++] = "-l";
args[argc++] = user;
}
args[argc++] = machine;
#endif
args[argc++] = rsync_path;
if (blocking_io < 0) {
char *cp;
if ((cp = strrchr(cmd, '/')) != NULL)
cp++;
else
cp = cmd;
if (strcmp(cp, "rsh") == 0 || strcmp(cp, "remsh") == 0)
blocking_io = 1;
}
server_options(args,&argc);
}
args[argc++] = ".";
if (!daemon_over_rsh && path && *path)
args[argc++] = path;
args[argc] = NULL;
if (verbose > 3) {
rprintf(FINFO,"cmd=");
for (i=0;i<argc;i++)
rprintf(FINFO,"%s ",args[i]);
rprintf(FINFO,"\n");
}
if (local_server) {
if (read_batch)
create_flist_from_batch(); /* sets batch_flist */
ret = local_child(argc, args, f_in, f_out, child_main);
} else {
ret = piped_child(args,f_in,f_out);
}
if (dir) free(dir);
return ret;
oom:
out_of_memory("do_cmd");
return 0; /* not reached */
}
static char *get_local_name(struct file_list *flist,char *name)
{
STRUCT_STAT st;
int e;
extern int orig_umask;
if (verbose > 2)
rprintf(FINFO,"get_local_name count=%d %s\n",
flist->count, NS(name));
if (!name)
return NULL;
if (do_stat(name,&st) == 0) {
if (S_ISDIR(st.st_mode)) {
if (!push_dir(name, 0)) {
rprintf(FERROR, "push_dir %s failed: %s (1)\n",
full_fname(name), strerror(errno));
exit_cleanup(RERR_FILESELECT);
}
return NULL;
}
if (flist->count > 1) {
rprintf(FERROR,"ERROR: destination must be a directory when copying more than 1 file\n");
exit_cleanup(RERR_FILESELECT);
}
return name;
}
if (flist->count <= 1 && ((e = strlen(name)) <= 1 || name[e-1] != '/'))
return name;
if (do_mkdir(name,0777 & ~orig_umask) != 0) {
rprintf(FERROR, "mkdir %s failed: %s\n",
full_fname(name), strerror(errno));
exit_cleanup(RERR_FILEIO);
} else {
if (verbose > 0)
rprintf(FINFO,"created directory %s\n",name);
}
if (!push_dir(name, 0)) {
rprintf(FERROR, "push_dir %s failed: %s (2)\n",
full_fname(name), strerror(errno));
exit_cleanup(RERR_FILESELECT);
}
return NULL;
}
static void do_server_sender(int f_in, int f_out, int argc,char *argv[])
{
int i;
struct file_list *flist;
char *dir = argv[0];
extern int relative_paths;
extern int recurse;
if (verbose > 2)
rprintf(FINFO,"server_sender starting pid=%d\n",(int)getpid());
if (!relative_paths && !push_dir(dir, 0)) {
rprintf(FERROR, "push_dir %s failed: %s (3)\n",
full_fname(dir), strerror(errno));
exit_cleanup(RERR_FILESELECT);
}
argc--;
argv++;
if (strcmp(dir,".")) {
int l = strlen(dir);
if (strcmp(dir,"/") == 0)
l = 0;
for (i=0;i<argc;i++)
argv[i] += l+1;
}
if (argc == 0 && recurse) {
argc=1;
argv--;
argv[0] = ".";
}
flist = send_file_list(f_out,argc,argv);
if (!flist || flist->count == 0) {
exit_cleanup(0);
}
io_start_buffering_in(f_in);
io_start_buffering_out(f_out);
send_files(flist,f_out,f_in);
io_flush();
report(f_out);
if (protocol_version >= 24) {
/* final goodbye message */
read_int(f_in);
}
io_flush();
exit_cleanup(0);
}
static int do_recv(int f_in,int f_out,struct file_list *flist,char *local_name)
{
int pid;
int status=0;
int recv_pipe[2];
int error_pipe[2];
extern int preserve_hard_links;
extern int delete_after;
extern int recurse;
extern int delete_mode;
if (preserve_hard_links)
init_hard_links(flist);
if (!delete_after) {
/* I moved this here from recv_files() to prevent a race condition */
if (recurse && delete_mode && !local_name && flist->count>0) {
delete_files(flist);
}
}
if (fd_pair(recv_pipe) < 0) {
rprintf(FERROR,"pipe failed in do_recv\n");
exit_cleanup(RERR_SOCKETIO);
}
if (fd_pair(error_pipe) < 0) {
rprintf(FERROR,"error pipe failed in do_recv\n");
exit_cleanup(RERR_SOCKETIO);
}
io_flush();
if ((pid=do_fork()) == 0) {
close(recv_pipe[0]);
close(error_pipe[0]);
if (f_in != f_out) close(f_out);
/* we can't let two processes write to the socket at one time */
io_multiplexing_close();
/* set place to send errors */
set_error_fd(error_pipe[1]);
recv_files(f_in,flist,local_name,recv_pipe[1]);
io_flush();
report(f_in);
write_int(recv_pipe[1],1);
close(recv_pipe[1]);
io_flush();
/* finally we go to sleep until our parent kills us
* with a USR2 signal. We sleep for a short time as on
* some OSes a signal won't interrupt a sleep! */
while (msleep(20))
;
}
close(recv_pipe[1]);
close(error_pipe[1]);
if (f_in != f_out) close(f_in);
io_start_buffering_out(f_out);
io_set_error_fd(error_pipe[0]);
generate_files(f_out,flist,local_name,recv_pipe[0]);
read_int(recv_pipe[0]);
close(recv_pipe[0]);
if (protocol_version >= 24) {
/* send a final goodbye message */
write_int(f_out, -1);
}
io_flush();
io_set_error_fd(-1);
kill(pid, SIGUSR2);
wait_process(pid, &status);
return status;
}
static void do_server_recv(int f_in, int f_out, int argc,char *argv[])
{
int status;
struct file_list *flist;
char *local_name=NULL;
char *dir = NULL;
extern int delete_mode;
extern int delete_excluded;
extern int module_id;
extern int read_batch;
extern struct file_list *batch_flist;
if (verbose > 2)
rprintf(FINFO,"server_recv(%d) starting pid=%d\n",argc,(int)getpid());
if (am_daemon && lp_read_only(module_id) && !am_sender) {
rprintf(FERROR,"ERROR: module is read only\n");
exit_cleanup(RERR_SYNTAX);
return;
}
if (argc > 0) {
dir = argv[0];
argc--;
argv++;
if (!am_daemon && !push_dir(dir, 0)) {
rprintf(FERROR, "push_dir %s failed: %s (4)\n",
full_fname(dir), strerror(errno));
exit_cleanup(RERR_FILESELECT);
}
}
io_start_buffering_in(f_in);
if (delete_mode && !delete_excluded)
recv_exclude_list(f_in);
if (filesfrom_fd >= 0) {
/* We're receiving the file info from the sender, so we need
* the IO routines to automatically write out the names onto
* our f_out socket as we read the list info from the sender.
* This avoids both deadlock and extra delays/buffers. */
io_set_filesfrom_fds(filesfrom_fd, f_out);
filesfrom_fd = -1;
}
if (read_batch)
flist = batch_flist;
else
flist = recv_file_list(f_in);
if (!flist) {
rprintf(FERROR,"server_recv: recv_file_list error\n");
exit_cleanup(RERR_FILESELECT);
}
if (argc > 0) {
if (strcmp(dir,".")) {
argv[0] += strlen(dir);
if (argv[0][0] == '/') argv[0]++;
}
local_name = get_local_name(flist,argv[0]);
}
status = do_recv(f_in,f_out,flist,local_name);
exit_cleanup(status);
}
int child_main(int argc, char *argv[])
{
start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
return 0;
}
void start_server(int f_in, int f_out, int argc, char *argv[])
{
extern int cvs_exclude;
extern int read_batch;
setup_protocol(f_out, f_in);
set_nonblocking(f_in);
set_nonblocking(f_out);
if (protocol_version >= 23)
io_start_multiplex_out(f_out);
if (am_sender) {
if (!read_batch) {
recv_exclude_list(f_in);
if (cvs_exclude)
add_cvs_excludes();
}
do_server_sender(f_in, f_out, argc, argv);
} else {
do_server_recv(f_in, f_out, argc, argv);
}
exit_cleanup(0);
}
/*
* This is called once the connection has been negotiated. It is used
* for rsyncd, remote-shell, and local connections.
*/
int client_run(int f_in, int f_out, pid_t pid, int argc, char *argv[])
{
struct file_list *flist = NULL;
int status = 0, status2 = 0;
char *local_name = NULL;
extern pid_t cleanup_child_pid;
extern int write_batch;
extern int read_batch;
extern struct file_list *batch_flist;
cleanup_child_pid = pid;
if (read_batch)
flist = batch_flist;
set_nonblocking(f_in);
set_nonblocking(f_out);
setup_protocol(f_out,f_in);
if (protocol_version >= 23)
io_start_multiplex_in(f_in);
if (am_sender) {
extern int cvs_exclude;
extern int delete_mode;
extern int delete_excluded;
io_start_buffering_out(f_out);
if (cvs_exclude)
add_cvs_excludes();
if (delete_mode && !delete_excluded)
send_exclude_list(f_out);
if (remote_filesfrom_file)
filesfrom_fd = f_in;
if (!read_batch) /* don't write to pipe */
flist = send_file_list(f_out,argc,argv);
if (verbose > 3)
rprintf(FINFO,"file list sent\n");
io_flush();
io_start_buffering_out(f_out);
send_files(flist,f_out,f_in);
io_flush();
if (protocol_version >= 24) {
/* final goodbye message */
read_int(f_in);
}
if (pid != -1) {
if (verbose > 3)
rprintf(FINFO,"client_run waiting on %d\n", (int) pid);
io_flush();
wait_process(pid, &status);
}
report(-1);
io_flush();
exit_cleanup(status);
}
if (argc == 0) {
extern int list_only;
list_only = 1;
}
if (!write_batch)
send_exclude_list(f_out);
if (filesfrom_fd >= 0) {
io_set_filesfrom_fds(filesfrom_fd, f_out);
filesfrom_fd = -1;
}
flist = recv_file_list(f_in);
if (!flist || flist->count == 0) {
rprintf(FINFO, "client: nothing to do: "
"perhaps you need to specify some filenames or "
"the --recursive option?\n");
exit_cleanup(0);
}
local_name = get_local_name(flist,argv[0]);
status2 = do_recv(f_in,f_out,flist,local_name);
if (pid != -1) {
if (verbose > 3)
rprintf(FINFO,"client_run2 waiting on %d\n", (int) pid);
io_flush();
wait_process(pid, &status);
}
return MAX(status, status2);
}
static int copy_argv (char *argv[])
{
int i;
for (i = 0; argv[i]; i++) {
if (!(argv[i] = strdup(argv[i]))) {
rprintf (FERROR, "out of memory at %s(%d)\n",
__FILE__, __LINE__);
return RERR_MALLOC;
}
}
return 0;
}
/**
* Start a client for either type of remote connection. Work out
* whether the arguments request a remote shell or rsyncd connection,
* and call the appropriate connection function, then run_client.
*
* Calls either start_socket_client (for sockets) or do_cmd and
* client_run (for ssh).
**/
static int start_client(int argc, char *argv[])
{
char *p;
char *shell_machine = NULL;
char *shell_path = NULL;
char *shell_user = NULL;
int ret;
pid_t pid;
int f_in,f_out;
extern int local_server;
extern char *shell_cmd;
extern int rsync_port;
extern int daemon_over_rsh;
extern int read_batch;
int rc;
/* Don't clobber argv[] so that ps(1) can still show the right
* command line. */
if ((rc = copy_argv(argv)))
return rc;
/* rsync:// always uses rsync server over direct socket connection */
if (strncasecmp(URL_PREFIX, argv[0], strlen(URL_PREFIX)) == 0) {
char *host, *path;
host = argv[0] + strlen(URL_PREFIX);
p = strchr(host,'/');
if (p) {
*p = 0;
path = p+1;
} else {
path = "";
}
p = strchr(host,':');
if (p) {
rsync_port = atoi(p+1);
*p = 0;
}
return start_socket_client(host, path, argc-1, argv+1);
}
if (!read_batch) {
p = find_colon(argv[0]);
if (p) {
if (remote_filesfrom_file
&& remote_filesfrom_file != files_from + 1
&& strncmp(files_from, argv[0], p-argv[0]+1) != 0) {
rprintf(FERROR,
"--files-from hostname is not transfer hostname\n");
exit_cleanup(RERR_SYNTAX);
}
if (p[1] == ':') { /* double colon */
*p = 0;
if (!shell_cmd) {
return start_socket_client(argv[0], p+2,
argc-1, argv+1);
}
p++;
daemon_over_rsh = 1;
}
if (argc < 1) {
usage(FERROR);
exit_cleanup(RERR_SYNTAX);
}
am_sender = 0;
*p = 0;
shell_machine = argv[0];
shell_path = p+1;
argc--;
argv++;
} else {
am_sender = 1;
/* rsync:// destination uses rsync server over direct socket */
if (strncasecmp(URL_PREFIX, argv[argc-1], strlen(URL_PREFIX)) == 0) {
char *host, *path;
host = argv[argc-1] + strlen(URL_PREFIX);
p = strchr(host,'/');
if (p) {
*p = 0;
path = p+1;
} else {
path = "";
}
p = strchr(host,':');
if (p) {
rsync_port = atoi(p+1);
*p = 0;
}
return start_socket_client(host, path, argc-1, argv);
}
p = find_colon(argv[argc-1]);
if (p && remote_filesfrom_file
&& remote_filesfrom_file != files_from + 1
&& strncmp(files_from, argv[argc-1], p-argv[argc-1]+1) != 0) {
rprintf(FERROR,
"--files-from hostname is not transfer hostname\n");
exit_cleanup(RERR_SYNTAX);
}
if (!p) {
local_server = 1;
if (remote_filesfrom_file) {
rprintf(FERROR,
"--files-from is remote but transfer is local\n");
exit_cleanup(RERR_SYNTAX);
}
} else if (p[1] == ':') { /* double colon */
*p = 0;
if (!shell_cmd) {
return start_socket_client(argv[argc-1], p+2,
argc-1, argv);
}
p++;
daemon_over_rsh = 1;
}
if (argc < 2) {
usage(FERROR);
exit_cleanup(RERR_SYNTAX);
}
if (local_server) {
shell_machine = NULL;
shell_path = argv[argc-1];
} else {
*p = 0;
shell_machine = argv[argc-1];
shell_path = p+1;
}
argc--;
}
} else {
am_sender = 1;
local_server = 1;
shell_path = argv[argc-1];
}
if (shell_machine) {
p = strchr(shell_machine,'@');
if (p) {
*p = 0;
shell_user = shell_machine;
shell_machine = p+1;
}
}
if (verbose > 3) {
rprintf(FINFO,"cmd=%s machine=%s user=%s path=%s\n",
shell_cmd?shell_cmd:"",
shell_machine?shell_machine:"",
shell_user?shell_user:"",
shell_path?shell_path:"");
}
if (!am_sender && argc > 1) {
usage(FERROR);
exit_cleanup(RERR_SYNTAX);
}
if (argc == 0 && !am_sender) {
extern int list_only;
list_only = 1;
}
pid = do_cmd(shell_cmd,shell_machine,shell_user,shell_path,
&f_in,&f_out);
/* if we're running an rsync server on the remote host over a
* remote shell command, we need to do the RSYNCD protocol first */
if (daemon_over_rsh) {
int tmpret;
tmpret = start_inband_exchange(shell_user, shell_path,
f_in, f_out, argc);
if (tmpret < 0)
return tmpret;
}
ret = client_run(f_in, f_out, pid, argc, argv);
fflush(stdout);
fflush(stderr);
return ret;
}
static RETSIGTYPE sigusr1_handler(UNUSED(int val))
{
exit_cleanup(RERR_SIGNAL);
}
static RETSIGTYPE sigusr2_handler(UNUSED(int val))
{
extern int log_got_error;
if (log_got_error) _exit(RERR_PARTIAL);
_exit(0);
}
static RETSIGTYPE sigchld_handler(UNUSED(int val))
{
#ifdef WNOHANG
int cnt, status;
pid_t pid;
/* An empty waitpid() loop was put here by Tridge and we could never
* get him to explain why he put it in, so rather than taking it
* out we're instead saving the child exit statuses for later use.
* The waitpid() loop presumably eliminates all possibility of leaving
* zombie children, maybe that's why he did it.
*/
while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
/* save the child's exit status */
for (cnt = 0; cnt < MAXCHILDPROCS; cnt++) {
if (pid_stat_table[cnt].pid == 0) {
pid_stat_table[cnt].pid = pid;
pid_stat_table[cnt].status = status;
break;
}
}
}
#endif
}
/**
* This routine catches signals and tries to send them to gdb.
*
* Because it's called from inside a signal handler it ought not to
* use too many library routines.
*
* @todo Perhaps use "screen -X" instead/as well, to help people
* debugging without easy access to X. Perhaps use an environment
* variable, or just call a script?
*
* @todo The /proc/ magic probably only works on Linux (and
* Solaris?) Can we be more portable?
**/
#ifdef MAINTAINER_MODE
const char *get_panic_action(void)
{
const char *cmd_fmt = getenv("RSYNC_PANIC_ACTION");
if (cmd_fmt)
return cmd_fmt;
else
return "xterm -display :0 -T Panic -n Panic "
"-e gdb /proc/%d/exe %d";
}
/**
* Handle a fatal signal by launching a debugger, controlled by $RSYNC_PANIC_ACTION.
*
* This signal handler is only installed if we were configured with
* --enable-maintainer-mode. Perhaps it should always be on and we
* should just look at the environment variable, but I'm a bit leery
* of a signal sending us into a busy loop.
**/
static RETSIGTYPE rsync_panic_handler(UNUSED(int whatsig))
{
char cmd_buf[300];
int ret;
sprintf(cmd_buf, get_panic_action(),
getpid(), getpid());
/* Unless we failed to execute gdb, we allow the process to
* continue. I'm not sure if that's right. */
ret = system(cmd_buf);
if (ret)
_exit(ret);
}
#endif
int main(int argc,char *argv[])
{
extern int am_root;
extern int orig_umask;
extern int dry_run;
int ret;
extern int write_batch;
int orig_argc;
char **orig_argv;
orig_argc = argc;
orig_argv = argv;
signal(SIGUSR1, sigusr1_handler);
signal(SIGUSR2, sigusr2_handler);
signal(SIGCHLD, sigchld_handler);
#ifdef MAINTAINER_MODE
signal(SIGSEGV, rsync_panic_handler);
signal(SIGFPE, rsync_panic_handler);
signal(SIGABRT, rsync_panic_handler);
signal(SIGBUS, rsync_panic_handler);
#endif /* def MAINTAINER_MODE */
starttime = time(NULL);
am_root = (getuid() == 0);
memset(&stats, 0, sizeof(stats));
if (argc < 2) {
usage(FERROR);
exit_cleanup(RERR_SYNTAX);
}
/* we set a 0 umask so that correct file permissions can be
* carried across */
orig_umask = (int)umask(0);
if (!parse_arguments(&argc, (const char ***) &argv, 1)) {
/* FIXME: We ought to call the same error-handling
* code here, rather than relying on getopt. */
option_error();
exit_cleanup(RERR_SYNTAX);
}
signal(SIGINT,SIGNAL_CAST sig_int);
signal(SIGHUP,SIGNAL_CAST sig_int);
signal(SIGTERM,SIGNAL_CAST sig_int);
/* Ignore SIGPIPE; we consistently check error codes and will
* see the EPIPE. */
signal(SIGPIPE, SIG_IGN);
/* Initialize push_dir here because on some old systems getcwd
* (implemented by forking "pwd" and reading its output) doesn't
* work when there are other child processes. Also, on all systems
* that implement getcwd that way "pwd" can't be found after chroot. */
push_dir(NULL,0);
if (write_batch && !am_server) {
write_batch_argvs_file(orig_argc, orig_argv);
}
if (am_daemon && !am_server)
return daemon_main();
if (argc < 1) {
usage(FERROR);
exit_cleanup(RERR_SYNTAX);
}
if (dry_run)
verbose = MAX(verbose,1);
#ifndef SUPPORT_LINKS
if (!am_server && preserve_links) {
rprintf(FERROR,"ERROR: symbolic links not supported\n");
exit_cleanup(RERR_UNSUPPORTED);
}
#endif
if (am_server) {
set_nonblocking(STDIN_FILENO);
set_nonblocking(STDOUT_FILENO);
if (am_daemon)
return start_daemon(STDIN_FILENO, STDOUT_FILENO);
start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv);
}
ret = start_client(argc, argv);
if (ret == -1)
exit_cleanup(RERR_STARTCLIENT);
else
exit_cleanup(ret);
return ret;
}
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