void
nextconfig (const char *file)
{
#ifndef IPV6
struct servent *sp;
#endif
struct servtab *sep, **sepp;
struct passwd *pwd;
FILE *fconfig;
SIGSTATUS sigstatus;
size_t line = 0;
fconfig = setconfig (file);
if (!fconfig)
{
syslog (LOG_ERR, "%s: %m", file);
return;
}
while ((sep = getconfigent (fconfig, file, &line)))
{
if ((pwd = getpwnam (sep->se_user)) == NULL)
{
syslog (LOG_ERR, "%s/%s: No such user '%s', service ignored",
sep->se_service, sep->se_proto, sep->se_user);
continue;
}
if (ISMUX (sep))
{
sep->se_fd = -1;
sep->se_checked = 1;
enter (sep);
}
else
expand_enter (sep);
freeconfig (sep);
}
endconfig (fconfig);
/*
* Purge anything not looked at above.
*/
signal_block (&sigstatus);
sepp = &servtab;
while ((sep = *sepp))
{
if (sep->se_checked)
{
sepp = &sep->se_next;
continue;
}
*sepp = sep->se_next;
if (sep->se_fd >= 0)
close_sep (sep);
if (debug)
print_service ("FREE", sep);
freeconfig (sep);
free (sep);
}
signal_unblock (&sigstatus);
}
static void internal_exec_helper( const wchar_t *def,
int block_type,
io_data_t *io )
{
io_data_t *io_internal = io_transmogrify( io );
int is_block_old=is_block;
is_block=1;
/*
Did the transmogrification fail - if so, set error status and return
*/
if( io && !io_internal )
{
proc_set_last_status( STATUS_EXEC_FAIL );
return;
}
signal_unblock();
eval( def, io_internal, block_type );
signal_block();
io_untransmogrify( io, io_internal );
job_reap( 0 );
is_block=is_block_old;
}
static int check_signals(void)
{
int sig = 0;
signal_block(sigmask);
if(end_signal){
#ifdef DEBUG
write_log("LM(P) SIGTERM receive(data_output_process)\n");
#endif
sig |= DETECT_END; /* SIGTERM */
}
if(last_signal){
#ifdef DEBUG
write_log("LM(P) SIGUSR1 receive(data_output_process)\n");
#endif
/* data read until pipe empty */
fcntl(DATA_PATH, F_SETFL, fcntl(DATA_PATH, F_GETFL, 0) | O_NONBLOCK);
last_signal = 0;
sig |= DETECT_LAST; /* SIGUSR1 */
}
if(start_signal){
#ifdef DEBUG
write_log("LM(P) SIGUSR2 receive(data_output_process)\n");
#endif
sig |= DETECT_START;
}
signal_unblock(sigmask);
return sig;
}
// DESTRUCTOR
child_t::~child_t() {
child[thischild] = child[noc];
noc--;
signal_block(SIGCHLD);
if (pid >0) { kill(pid, SIGKILL); } // FIXME: this will cause an unmatched SIGCHLD
signal_unblock(SIGCHLD);
}
bool process_iterator_t::next_process(wcstring *out_str, pid_t *out_pid)
{
wcstring cmd;
pid_t pid = 0;
while (cmd.empty())
{
wcstring name;
if (! dir || ! wreaddir(dir, name))
break;
if (!iswnumeric(name.c_str()))
continue;
wcstring path = wcstring(L"/proc/") + name;
struct stat buf;
if (wstat(path, &buf))
continue;
if (buf.st_uid != getuid())
continue;
/* remember the pid */
pid = fish_wcstoi(name.c_str(), NULL, 10);
/* the 'cmdline' file exists, it should contain the commandline */
FILE *cmdfile;
if ((cmdfile=wfopen(path + L"/cmdline", "r")))
{
wcstring full_command_line;
signal_block();
fgetws2(&full_command_line, cmdfile);
signal_unblock();
/* The command line needs to be escaped */
cmd = tok_first(full_command_line.c_str());
}
#ifdef SunOS
else if ((cmdfile=wfopen(path + L"/psinfo", "r")))
{
psinfo_t info;
if (fread(&info, sizeof(info), 1, cmdfile))
{
/* The filename is unescaped */
cmd = str2wcstring(info.pr_fname);
}
}
#endif
if (cmdfile)
fclose(cmdfile);
}
bool result = ! cmd.empty();
if (result)
{
*out_str = cmd;
*out_pid = pid;
}
return result;
}
void parser_t::job_promote(job_t *job)
{
signal_block();
job_list_t::iterator loc = std::find(my_job_list.begin(), my_job_list.end(), job);
assert(loc != my_job_list.end());
/* Move the job to the beginning */
my_job_list.splice(my_job_list.begin(), my_job_list, loc);
signal_unblock();
}
int child_t::terminate() {
signal_block(SIGCHLD);
if ( pid > 0 ) {
kill(pid, SIGTERM);
printf("waiting for child termination...\n");
signal_unblock(SIGCHLD);
sleep(1);
}
signal_unblock(SIGCHLD);
this->child_postmortem();
return ( status != CLD_RUNNING );
}
void event_remove(const event_t &criterion)
{
event_list_t new_list;
if (debug_level >= 3)
{
wcstring desc = event_desc_compact(criterion);
debug(3, "unregister: %ls\n", desc.c_str());
}
/*
Because of concurrency issues (env_remove could remove an event
that is currently being executed), env_remove does not actually
free any events - instead it simply moves all events that should
be removed from the event list to the killme list, and the ones
that shouldn't be killed to new_list, and then drops the empty
events-list.
*/
if (events.empty())
return;
for (size_t i=0; i<events.size(); i++)
{
event_t *n = events.at(i);
if (event_match(criterion, *n))
{
killme.push_back(n);
/*
If this event was a signal handler and no other handler handles
the specified signal type, do not handle that type of signal any
more.
*/
if (n->type == EVENT_SIGNAL)
{
event_t e = event_t::signal_event(n->param1.signal);
if (event_get(e, 0) == 1)
{
signal_handle(e.param1.signal, 0);
}
}
}
else
{
new_list.push_back(n);
}
}
signal_block();
events.swap(new_list);
signal_unblock();
}
void event_add_handler(const event_t *event)
{
event_t *e;
CHECK(event,);
e = event_copy(event, 0);
if (e->type == EVENT_SIGNAL)
{
signal_handle(e->param1.signal, 1);
}
// Block around updating the events vector
signal_block();
events.push_back(e);
signal_unblock();
}
/// Returns control of the terminal to the shell, and saves the terminal attribute state to the job,
/// so that we can restore the terminal ownership to the job at a later time.
static bool terminal_return_from_job(job_t *j) {
errno = 0;
if (j->pgid == 0) {
debug(2, "terminal_return_from_job() returning early due to no process group");
return true;
}
signal_block();
if (tcsetpgrp(STDIN_FILENO, getpgrp()) == -1) {
if (errno == ENOTTY) redirect_tty_output();
debug(1, _(L"Could not return shell to foreground"));
wperror(L"tcsetpgrp");
signal_unblock();
return false;
}
// Save jobs terminal modes.
if (tcgetattr(STDIN_FILENO, &j->tmodes)) {
if (errno == EIO) redirect_tty_output();
debug(1, _(L"Could not return shell to foreground"));
wperror(L"tcgetattr");
signal_unblock();
return false;
}
// Disabling this per
// https://github.com/adityagodbole/fish-shell/commit/9d229cd18c3e5c25a8bd37e9ddd3b67ddc2d1b72 On
// Linux, 'cd . ; ftp' prevents you from typing into the ftp prompt. See
// https://github.com/fish-shell/fish-shell/issues/121
#if 0
// Restore the shell's terminal modes.
if (tcsetattr(STDIN_FILENO, TCSADRAIN, &shell_modes) == -1) {
if (errno == EIO) redirect_tty_output();
debug(1, _(L"Could not return shell to foreground"));
wperror(L"tcsetattr");
return false;
}
#endif
signal_unblock();
return true;
}
/**
Load contents of the backing file to memory
*/
static void history_load( history_mode_t *m )
{
int fd;
int ok=0;
void *context;
wchar_t *filename;
if( !m )
return;
m->has_loaded=1;
signal_block();
context = halloc( 0, 0 );
filename = history_filename( context, m->name, 0 );
if( filename )
{
if( ( fd = wopen( filename, O_RDONLY ) ) > 0 )
{
off_t len = lseek( fd, 0, SEEK_END );
if( len != (off_t)-1)
{
m->mmap_length = (size_t)len;
if( lseek( fd, 0, SEEK_SET ) == 0 )
{
if( (m->mmap_start = mmap( 0, m->mmap_length, PROT_READ, MAP_PRIVATE, fd, 0 )) != MAP_FAILED )
{
ok = 1;
history_populate_from_mmap( m );
}
}
}
close( fd );
}
}
halloc_free( context );
signal_unblock();
}
void event_add_handler(const event_t &event)
{
event_t *e;
if (debug_level >= 3)
{
wcstring desc = event_desc_compact(event);
debug(3, "register: %ls\n", desc.c_str());
}
e = new event_t(event);
if (e->type == EVENT_SIGNAL)
{
signal_handle(e->param1.signal, 1);
}
// Block around updating the events vector
signal_block();
events.push_back(e);
signal_unblock();
}
/* 线程入口函数 */
void *thread::start_routine( void *arg )
{
class thread *_thread = static_cast<class thread *>( arg );
assert( "thread start routine got NULL argument",_thread );
signal_block(); /* 子线程不处理外部信号 */
if ( !_thread->initlization() ) /* 初始化 */
{
ERROR( "thread initlization fail" );
return NULL;
}
_thread->do_routine();
if ( !_thread->cleanup() ) /* 清理 */
{
ERROR( "thread cleanup fail" );
return NULL;
}
return NULL;
}
int child_t::child_prefork_init() {
status = CLD_UNKNOWN_STATUS;
// PREPARE CHILD
inp.reopen();
outp.reopen();
errp.reopen();
// prevent fork-loop
//if (time(NULL)-last_restart_time < MIN_FORK_DELTA_T ) {
// fprintf(stderr, "%ld %s > info='child respawn too quick -- aborting.'\n", time(NULL), clientid);
// return -1;
//}
// catch SIGCHLD
signal_block(SIGCHLD); // do not interrupt parent to early
if ( signal_handler(SIGCHLD, sigchld_handler) < 0) {
fprintf(stderr, "ERROR: Could not retister SIGCHLD handler. Bailing out.\n");
return 1;
}
return 0;
}
void job_continue(job_t *j, bool cont)
{
/*
Put job first in the job list
*/
job_promote(j);
job_set_flag(j, JOB_NOTIFIED, 0);
CHECK_BLOCK();
debug(4,
L"Continue job %d, gid %d (%ls), %ls, %ls",
j->job_id,
j->pgid,
j->command_wcstr(),
job_is_completed(j)?L"COMPLETED":L"UNCOMPLETED",
is_interactive?L"INTERACTIVE":L"NON-INTERACTIVE");
if (!job_is_completed(j))
{
if (job_get_flag(j, JOB_TERMINAL) && job_get_flag(j, JOB_FOREGROUND))
{
/* Put the job into the foreground. Hack: ensure that stdin is marked as blocking first (#176). */
make_fd_blocking(STDIN_FILENO);
signal_block();
bool ok = terminal_give_to_job(j, cont);
signal_unblock();
if (!ok)
return;
}
/*
Send the job a continue signal, if necessary.
*/
if (cont)
{
process_t *p;
for (p=j->first_process; p; p=p->next)
p->stopped=0;
if (job_get_flag(j, JOB_CONTROL))
{
if (killpg(j->pgid, SIGCONT))
{
wperror(L"killpg (SIGCONT)");
return;
}
}
else
{
for (p=j->first_process; p; p=p->next)
{
if (kill(p->pid, SIGCONT) < 0)
{
wperror(L"kill (SIGCONT)");
return;
}
}
}
}
if (job_get_flag(j, JOB_FOREGROUND))
{
/* Look for finished processes first, to avoid select() if it's already done. */
process_mark_finished_children(false);
/*
Wait for job to report.
*/
while (! reader_exit_forced() && ! job_is_stopped(j) && ! job_is_completed(j))
{
// debug( 1, L"select_try()" );
switch (select_try(j))
{
case 1:
{
read_try(j);
process_mark_finished_children(false);
break;
}
case 0:
{
/* No FDs are ready. Look for finished processes. */
process_mark_finished_children(false);
break;
}
case -1:
{
/*
If there is no funky IO magic, we can use
waitpid instead of handling child deaths
through signals. This gives a rather large
speed boost (A factor 3 startup time
improvement on my 300 MHz machine) on
short-lived jobs.
This will return early if we get a signal,
like SIGHUP.
*/
process_mark_finished_children(true);
break;
}
}
}
}
}
if (job_get_flag(j, JOB_FOREGROUND))
{
if (job_is_completed(j))
{
// It's possible that the job will produce output and exit before we've even read from it.
// We'll eventually read the output, but it may be after we've executed subsequent calls
// This is why my prompt colors kept getting screwed up - the builtin echo calls
// were sometimes having their output combined with the set_color calls in the wrong order!
read_try(j);
process_t *p = j->first_process;
while (p->next)
p = p->next;
if (WIFEXITED(p->status) || WIFSIGNALED(p->status))
{
/*
Mark process status only if we are in the foreground
and the last process in a pipe, and it is not a short circuited builtin
*/
if (p->pid)
{
int status = proc_format_status(p->status);
//wprintf(L"setting status %d for %ls\n", job_get_flag( j, JOB_NEGATE )?!status:status, j->command);
proc_set_last_status(job_get_flag(j, JOB_NEGATE)?!status:status);
}
}
}
/* Put the shell back in the foreground. */
if (job_get_flag(j, JOB_TERMINAL) && job_get_flag(j, JOB_FOREGROUND))
{
int ok;
signal_block();
ok = terminal_return_from_job(j);
signal_unblock();
if (!ok)
return;
}
}
}
int
main (int argc, char *argv[], char *envp[])
{
int index;
struct servtab *sep;
int dofork;
pid_t pid;
set_program_name (argv[0]);
Argv = argv;
if (envp == 0 || *envp == 0)
envp = argv;
while (*envp)
envp++;
LastArg = envp[-1] + strlen (envp[-1]);
/* Parse command line */
iu_argp_init ("inetd", program_authors);
argp_parse (&argp, argc, argv, 0, &index, NULL);
if (resolve_option)
env_option = true;
if (index < argc)
{
int i;
config_files = calloc (argc - index + 1, sizeof (*config_files));
for (i = 0; index < argc; index++, i++)
{
config_files[i] = strdup (argv[index]);
}
}
else
{
config_files = calloc (3, sizeof (*config_files));
config_files[0] = newstr (PATH_INETDCONF);
config_files[1] = newstr (PATH_INETDDIR);
}
if (!debug)
{
daemon (0, 0);
}
openlog ("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
{
FILE *fp = fopen (PATH_INETDPID, "w");
if (fp != NULL)
{
fprintf (fp, "%d\n", getpid ());
fclose (fp);
}
else
syslog (LOG_CRIT, "can't open %s: %s\n", PATH_INETDPID,
strerror (errno));
}
signal_set_handler (SIGALRM, retry);
config (0);
signal_set_handler (SIGHUP, config);
signal_set_handler (SIGCHLD, reapchild);
signal_set_handler (SIGPIPE, SIG_IGN);
{
/* space for daemons to overwrite environment for ps */
#define DUMMYSIZE 100
char dummy[DUMMYSIZE];
memset (dummy, 'x', DUMMYSIZE - 1);
dummy[DUMMYSIZE - 1] = '\0';
setenv ("inetd_dummy", dummy, 1);
}
for (;;)
{
int n, ctrl;
fd_set readable;
if (nsock == 0)
{
SIGSTATUS stat;
sigstatus_empty (stat);
signal_block (NULL);
while (nsock == 0)
inetd_pause (stat);
signal_unblock (NULL);
}
readable = allsock;
if ((n = select (maxsock + 1, &readable, NULL, NULL, NULL)) <= 0)
{
if (n < 0 && errno != EINTR)
syslog (LOG_WARNING, "select: %m");
sleep (1);
continue;
}
for (sep = servtab; n && sep; sep = sep->se_next)
if (sep->se_fd != -1 && FD_ISSET (sep->se_fd, &readable))
{
n--;
if (debug)
fprintf (stderr, "someone wants %s\n", sep->se_service);
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
{
struct sockaddr_in sa_client;
socklen_t len = sizeof (sa_client);
ctrl = accept (sep->se_fd, (struct sockaddr *) &sa_client,
&len);
if (debug)
fprintf (stderr, "accept, ctrl %d\n", ctrl);
if (ctrl < 0)
{
if (errno != EINTR)
syslog (LOG_WARNING, "accept (for %s): %m",
sep->se_service);
continue;
}
if (env_option)
prepenv (ctrl, sa_client);
}
else
ctrl = sep->se_fd;
signal_block (NULL);
pid = 0;
dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork);
if (dofork)
{
if (sep->se_count++ == 0)
gettimeofday (&sep->se_time, NULL);
else if ((sep->se_max && sep->se_count > sep->se_max)
|| sep->se_count >= toomany)
{
struct timeval now;
gettimeofday (&now, NULL);
if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL)
{
sep->se_time = now;
sep->se_count = 1;
}
else
{
syslog (LOG_ERR,
"%s/%s server failing (looping), service terminated",
sep->se_service, sep->se_proto);
close_sep (sep);
if (! sep->se_wait && sep->se_socktype == SOCK_STREAM)
close (ctrl);
signal_unblock (NULL);
if (!timingout)
{
timingout = 1;
alarm (RETRYTIME);
}
continue;
}
}
pid = fork ();
}
if (pid < 0)
{
syslog (LOG_ERR, "fork: %m");
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
close (ctrl);
signal_unblock (NULL);
sleep (1);
continue;
}
if (pid && sep->se_wait)
{
sep->se_wait = pid;
if (sep->se_fd >= 0)
{
FD_CLR (sep->se_fd, &allsock);
nsock--;
}
}
signal_unblock (NULL);
if (pid == 0)
{
if (debug && dofork)
setsid ();
if (dofork)
{
int sock;
if (debug)
fprintf (stderr, "+ Closing from %d\n", maxsock);
for (sock = maxsock; sock > 2; sock--)
if (sock != ctrl)
close (sock);
}
run_service (ctrl, sep);
}
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
close (ctrl);
}
}
}
struct servtab *
enter (struct servtab *cp)
{
struct servtab *sep;
SIGSTATUS sigstatus;
int i;
/* Checking/Removing duplicates */
for (sep = servtab; sep; sep = sep->se_next)
if (memcmp (&sep->se_ctrladdr, &cp->se_ctrladdr,
sizeof (sep->se_ctrladdr)) == 0
&& strcmp (sep->se_service, cp->se_service) == 0
&& strcmp (sep->se_proto, cp->se_proto) == 0
&& ISMUX (sep) == ISMUX (cp))
break;
if (sep != 0)
{
signal_block (&sigstatus);
/*
* sep->se_wait may be holding the pid of a daemon
* that we're waiting for. If so, don't overwrite
* it unless the config file explicitly says don't
* wait.
*/
if (cp->se_bi == 0 && (sep->se_wait == 1 || cp->se_wait == 0))
sep->se_wait = cp->se_wait;
#define SWAP(a, b) { char *c = a; a = b; b = c; }
if (cp->se_user)
SWAP (sep->se_user, cp->se_user);
if (cp->se_server)
SWAP (sep->se_server, cp->se_server);
argcv_free (sep->se_argc, sep->se_argv);
sep->se_argc = cp->se_argc;
sep->se_argv = cp->se_argv;
cp->se_argc = 0;
cp->se_argv = NULL;
sep->se_checked = 1;
signal_unblock (&sigstatus);
if (debug)
print_service ("REDO", sep);
return sep;
}
if (debug)
print_service ("ADD ", cp);
sep = (struct servtab *) malloc (sizeof (*sep));
if (sep == NULL)
{
syslog (LOG_ERR, "Out of memory.");
exit (-1);
}
*sep = *cp;
dupstr (&sep->se_node);
dupstr (&sep->se_service);
dupstr (&sep->se_proto);
dupstr (&sep->se_user);
dupstr (&sep->se_server);
dupmem ((void**)&sep->se_argv, sep->se_argc * sizeof (sep->se_argv[0]));
for (i = 0; i < sep->se_argc; i++)
dupstr (&sep->se_argv[i]);
sep->se_fd = -1;
signal_block (&sigstatus);
sep->se_next = servtab;
servtab = sep;
signal_unblock (&sigstatus);
return sep;
}
/**
Save the specified mode to file
*/
static void history_save_mode( void *n, history_mode_t *m )
{
FILE *out;
history_mode_t *on_disk;
int i;
int has_new=0;
wchar_t *tmp_name;
int ok = 1;
/*
First check if there are any new entries to save. If not, then
we can just return
*/
for( i=0; i<al_get_count(&m->item); i++ )
{
void *ptr = al_get( &m->item, i );
has_new = item_is_new( m, ptr );
if( has_new )
{
break;
}
}
if( !has_new )
{
return;
}
signal_block();
/*
Set up on_disk variable to describe the current contents of the
history file
*/
on_disk = history_create_mode( m->name );
history_load( on_disk );
tmp_name = history_filename( on_disk, m->name, L".tmp" );
if( tmp_name )
{
tmp_name = wcsdup(tmp_name );
if( (out=wfopen( tmp_name, "w" ) ) )
{
hash_table_t mine;
hash_init( &mine, &hash_item_func, &hash_item_cmp );
for( i=0; i<al_get_count(&m->item); i++ )
{
void *ptr = al_get( &m->item, i );
int is_new = item_is_new( m, ptr );
if( is_new )
{
hash_put( &mine, item_get( m, ptr ), L"" );
}
}
/*
Re-save the old history
*/
for( i=0; ok && (i<al_get_count(&on_disk->item)); i++ )
{
void *ptr = al_get( &on_disk->item, i );
item_t *i = item_get( on_disk, ptr );
if( !hash_get( &mine, i ) )
{
if( item_write( out, on_disk, ptr ) == -1 )
{
ok = 0;
break;
}
}
}
hash_destroy( &mine );
/*
Add our own items last
*/
for( i=0; ok && (i<al_get_count(&m->item)); i++ )
{
void *ptr = al_get( &m->item, i );
int is_new = item_is_new( m, ptr );
if( is_new )
{
if( item_write( out, m, ptr ) == -1 )
{
ok = 0;
}
}
}
if( fclose( out ) || !ok )
{
/*
This message does not have high enough priority to
be shown by default.
*/
debug( 2, L"Error when writing history file" );
}
else
{
wrename( tmp_name, history_filename( on_disk, m->name, 0 ) );
}
}
free( tmp_name );
}
halloc_free( on_disk);
if( ok )
{
/*
Reset the history. The item_t entries created in this session
are not lost or dropped, they are stored in the session_item
hash table. On reload, they will be automatically inserted at
the end of the history list.
*/
if( m->mmap_start && (m->mmap_start != MAP_FAILED ) )
{
munmap( m->mmap_start, m->mmap_length );
}
al_truncate( &m->item, 0 );
al_truncate( &m->used, 0 );
m->pos = 0;
m->has_loaded = 0;
m->mmap_start=0;
m->mmap_length=0;
m->save_timestamp=time(0);
m->new_count = 0;
}
signal_unblock();
}
/// Give ownership of the terminal to the specified job.
///
/// \param j The job to give the terminal to.
/// \param cont If this variable is set, we are giving back control to a job that has previously
/// been stopped. In that case, we need to set the terminal attributes to those saved in the job.
bool terminal_give_to_job(job_t *j, int cont) {
errno = 0;
if (j->pgid == 0) {
debug(2, "terminal_give_to_job() returning early due to no process group");
return true;
}
signal_block();
// It may not be safe to call tcsetpgrp if we've already done so, as at that point we are no
// longer the controlling process group for the terminal and no longer have permission to set
// the process group that is in control, causing tcsetpgrp to return EPERM, even though that's
// not the documented behavior in tcsetpgrp(3), which instead says other bad things will happen
// (it says SIGTTOU will be sent to all members of the background *calling* process group, but
// it's more complicated than that, SIGTTOU may or may not be sent depending on the TTY
// configuration and whether or not signal handlers for SIGTTOU are installed. Read:
// http://curiousthing.org/sigttin-sigttou-deep-dive-linux In all cases, our goal here was just
// to hand over control of the terminal to this process group, which is a no-op if it's already
// been done.
if (tcgetpgrp(STDIN_FILENO) == j->pgid) {
debug(4, L"Process group %d already has control of terminal\n", j->pgid);
} else {
debug(4,
L"Attempting to bring process group to foreground via tcsetpgrp for job->pgid %d\n",
j->pgid);
// The tcsetpgrp(2) man page says that EPERM is thrown if "pgrp has a supported value, but
// is not the process group ID of a process in the same session as the calling process."
// Since we _guarantee_ that this isn't the case (the child calls setpgid before it calls
// SIGSTOP, and the child was created in the same session as us), it seems that EPERM is
// being thrown because of an caching issue - the call to tcsetpgrp isn't seeing the
// newly-created process group just yet. On this developer's test machine (WSL running Linux
// 4.4.0), EPERM does indeed disappear on retry. The important thing is that we can
// guarantee the process isn't going to exit while we wait (which would cause us to possibly
// block indefinitely).
while (tcsetpgrp(STDIN_FILENO, j->pgid) != 0) {
bool pgroup_terminated = false;
if (errno == EINTR) {
; // Always retry on EINTR, see comments in tcsetattr EINTR code below.
} else if (errno == EINVAL) {
// OS X returns EINVAL if the process group no longer lives. Probably other OSes,
// too. Unlike EPERM below, EINVAL can only happen if the process group has
// terminated.
pgroup_terminated = true;
} else if (errno == EPERM) {
// Retry so long as this isn't because the process group is dead.
int wait_result = waitpid(-1 * j->pgid, &wait_result, WNOHANG);
if (wait_result == -1) {
// Note that -1 is technically an "error" for waitpid in the sense that an
// invalid argument was specified because no such process group exists any
// longer. This is the observed behavior on Linux 4.4.0. a "success" result
// would mean processes from the group still exist but is still running in some
// state or the other.
pgroup_terminated = true;
} else {
// Debug the original tcsetpgrp error (not the waitpid errno) to the log, and
// then retry until not EPERM or the process group has exited.
debug(2, L"terminal_give_to_job(): EPERM.\n", j->pgid);
}
} else {
if (errno == ENOTTY) redirect_tty_output();
debug(1, _(L"Could not send job %d ('%ls') with pgid %d to foreground"), j->job_id,
j->command_wcstr(), j->pgid);
wperror(L"tcsetpgrp");
signal_unblock();
return false;
}
if (pgroup_terminated) {
// All processes in the process group has exited. Since we force all child procs to
// SIGSTOP on startup, the only way that can happen is if the very last process in
// the group terminated, and didn't need to access the terminal, otherwise it would
// have hung waiting for terminal IO (SIGTTIN). We can ignore this.
debug(3, L"tcsetpgrp called but process group %d has terminated.\n", j->pgid);
break;
}
}
}
if (cont) {
int result = -1;
// TODO: Remove this EINTR loop since we have blocked all signals and thus cannot be
// interrupted. I'm leaving it in place because all of the logic involving controlling
// terminal management is more than a little opaque and smacks of voodoo programming.
errno = EINTR;
while (result == -1 && errno == EINTR) {
result = tcsetattr(STDIN_FILENO, TCSADRAIN, &j->tmodes);
}
if (result == -1) {
if (errno == ENOTTY) redirect_tty_output();
debug(1, _(L"Could not send job %d ('%ls') to foreground"), j->job_id,
j->command_wcstr());
wperror(L"tcsetattr");
signal_unblock();
return false;
}
}
signal_unblock();
return true;
}
static unsigned int data_output_main(int sm_sock_fd, int fix_size)
{
int sig = 0;
int r_size;
int w_size;
int dev_path = PRNT_PATH;
unsigned int total = 0; /* total data size (wrote size) */
char *buf;
char *ptr;
/* read buffer get */
buf = (char *)malloc(MAX_DATA);
if(!buf)
exit(0); /* no ram */
/* print data read(from stdin) and write(to stdout) */
while((r_size = read_data(buf)) > 0){
ptr = buf;
/* data print(output) loop */
for(;r_size > 0;r_size -= w_size){
int __attribute__ ((unused)) err;
signal_block(sigmask); /* signal block */
get_printer_sem(sem_id); /* printer lock */
w_size = p_dvacs->ptdev_write(dev_path, ptr, r_size); /* data write -> printer */
err = errno;
#ifdef DATA_LOG
if(log_hand >=0 && w_size > 0)
write(log_hand, ptr, w_size);
#endif
/* write() error check (power off??) */
if(w_size <= 0){
w_size = 0;
if(check_power(sm_sock_fd, dev_path) == LM_PRN_POWOFF){
#ifdef DEBUG
write_log("LM(P) into wait_restart()\n");
#endif
release_printer_sem(sem_id);
signal_unblock(sigmask);
/* wait BSCC SUCCESS */
if(wait_restart() == DETECT_END)
goto dataout_exit;
else
continue;
}
#ifdef DEBUG
fprintf(log_path, "LM(P) write error. normal=%x\n",err);
fflush(log_path);
#endif
sleep(1);
}
else
total += w_size; /* total write size save */
/* write() is normal end */
release_printer_sem(sem_id);
signal_unblock(sigmask);
if((sig = check_signals()) != 0){
/* signal detect */
if(signal_end(sig)){
goto dataout_exit; /* SIGTERM */
}
/* other signal ignore */
start_signal = 0;
last_signal = 0;
}
ptr += w_size;
}
/* written data size == request data size ?*/
if(fix_size && (total >= fix_size) )
break;
}
dataout_exit:
free(buf);
return total;
}
void exec( job_t *j )
{
process_t *p;
pid_t pid;
int mypipe[2];
sigset_t chldset;
int skip_fork;
io_data_t pipe_read, pipe_write;
io_data_t *tmp;
io_data_t *io_buffer =0;
/*
Set to 1 if something goes wrong while exec:ing the job, in
which case the cleanup code will kick in.
*/
int exec_error=0;
int needs_keepalive = 0;
process_t keepalive;
CHECK( j, );
CHECK_BLOCK();
if( no_exec )
return;
sigemptyset( &chldset );
sigaddset( &chldset, SIGCHLD );
debug( 4, L"Exec job '%ls' with id %d", j->command, j->job_id );
if( block_io )
{
if( j->io )
{
j->io = io_add( io_duplicate( j, block_io), j->io );
}
else
{
j->io=io_duplicate( j, block_io);
}
}
io_data_t *input_redirect;
for( input_redirect = j->io; input_redirect; input_redirect = input_redirect->next )
{
if( (input_redirect->io_mode == IO_BUFFER) &&
input_redirect->is_input )
{
/*
Input redirection - create a new gobetween process to take
care of buffering
*/
process_t *fake = halloc( j, sizeof(process_t) );
fake->type = INTERNAL_BUFFER;
fake->pipe_write_fd = 1;
j->first_process->pipe_read_fd = input_redirect->fd;
fake->next = j->first_process;
j->first_process = fake;
break;
}
}
if( j->first_process->type==INTERNAL_EXEC )
{
/*
Do a regular launch - but without forking first...
*/
signal_block();
/*
setup_child_process makes sure signals are properly set
up. It will also call signal_unblock
*/
if( !setup_child_process( j, 0 ) )
{
/*
launch_process _never_ returns
*/
launch_process( j->first_process );
}
else
{
job_set_flag( j, JOB_CONSTRUCTED, 1 );
j->first_process->completed=1;
return;
}
}
pipe_read.fd=0;
pipe_write.fd=1;
pipe_read.io_mode=IO_PIPE;
pipe_read.param1.pipe_fd[0] = -1;
pipe_read.param1.pipe_fd[1] = -1;
pipe_read.is_input = 1;
pipe_write.io_mode=IO_PIPE;
pipe_write.is_input = 0;
pipe_read.next=0;
pipe_write.next=0;
pipe_write.param1.pipe_fd[0]=pipe_write.param1.pipe_fd[1]=-1;
j->io = io_add( j->io, &pipe_write );
signal_block();
/*
See if we need to create a group keepalive process. This is
a process that we create to make sure that the process group
doesn't die accidentally, and is often needed when a
builtin/block/function is inside a pipeline, since that
usually means we have to wait for one program to exit before
continuing in the pipeline, causing the group leader to
exit.
*/
if( job_get_flag( j, JOB_CONTROL ) )
{
for( p=j->first_process; p; p = p->next )
{
if( p->type != EXTERNAL )
{
if( p->next )
{
needs_keepalive = 1;
break;
}
if( p != j->first_process )
{
needs_keepalive = 1;
break;
}
}
}
}
if( needs_keepalive )
{
keepalive.pid = exec_fork();
if( keepalive.pid == 0 )
{
keepalive.pid = getpid();
set_child_group( j, &keepalive, 1 );
pause();
exit(0);
}
else
{
set_child_group( j, &keepalive, 0 );
}
}
/*
This loop loops over every process_t in the job, starting it as
appropriate. This turns out to be rather complex, since a
process_t can be one of many rather different things.
The loop also has to handle pipelining between the jobs.
*/
for( p=j->first_process; p; p = p->next )
{
mypipe[1]=-1;
skip_fork=0;
pipe_write.fd = p->pipe_write_fd;
pipe_read.fd = p->pipe_read_fd;
// debug( 0, L"Pipe created from fd %d to fd %d", pipe_write.fd, pipe_read.fd );
/*
This call is used so the global environment variable array
is regenerated, if needed, before the fork. That way, we
avoid a lot of duplicate work where EVERY child would need
to generate it, since that result would not get written
back to the parent. This call could be safely removed, but
it would result in slightly lower performance - at least on
uniprocessor systems.
*/
if( p->type == EXTERNAL )
env_export_arr( 1 );
/*
Set up fd:s that will be used in the pipe
*/
if( p == j->first_process->next )
{
j->io = io_add( j->io, &pipe_read );
}
if( p->next )
{
// debug( 1, L"%ls|%ls" , p->argv[0], p->next->argv[0]);
if( exec_pipe( mypipe ) == -1 )
{
debug( 1, PIPE_ERROR );
wperror (L"pipe");
exec_error=1;
break;
}
memcpy( pipe_write.param1.pipe_fd, mypipe, sizeof(int)*2);
}
else
{
/*
This is the last element of the pipeline.
Remove the io redirection for pipe output.
*/
j->io = io_remove( j->io, &pipe_write );
}
switch( p->type )
{
case INTERNAL_FUNCTION:
{
const wchar_t * orig_def;
wchar_t * def=0;
array_list_t *named_arguments;
int shadows;
/*
Calls to function_get_definition might need to
source a file as a part of autoloading, hence there
must be no blocks.
*/
signal_unblock();
orig_def = function_get_definition( p->argv[0] );
named_arguments = function_get_named_arguments( p->argv[0] );
shadows = function_get_shadows( p->argv[0] );
signal_block();
if( orig_def )
{
def = halloc_register( j, wcsdup(orig_def) );
}
if( def == 0 )
{
debug( 0, _( L"Unknown function '%ls'" ), p->argv[0] );
break;
}
parser_push_block( shadows?FUNCTION_CALL:FUNCTION_CALL_NO_SHADOW );
current_block->param2.function_call_process = p;
current_block->param1.function_call_name = halloc_register( current_block, wcsdup( p->argv[0] ) );
/*
set_argv might trigger an event
handler, hence we need to unblock
signals.
*/
signal_unblock();
parse_util_set_argv( p->argv+1, named_arguments );
signal_block();
parser_forbid_function( p->argv[0] );
if( p->next )
{
io_buffer = io_buffer_create( 0 );
j->io = io_add( j->io, io_buffer );
}
internal_exec_helper( def, TOP, j->io );
parser_allow_function();
parser_pop_block();
break;
}
case INTERNAL_BLOCK:
{
if( p->next )
{
io_buffer = io_buffer_create( 0 );
j->io = io_add( j->io, io_buffer );
}
internal_exec_helper( p->argv[0], TOP, j->io );
break;
}
case INTERNAL_BUILTIN:
{
int builtin_stdin=0;
int fg;
int close_stdin=0;
/*
If this is the first process, check the io
redirections and see where we should be reading
from.
*/
if( p == j->first_process )
{
io_data_t *in = io_get( j->io, 0 );
if( in )
{
switch( in->io_mode )
{
case IO_FD:
{
builtin_stdin = in->param1.old_fd;
break;
}
case IO_PIPE:
{
builtin_stdin = in->param1.pipe_fd[0];
break;
}
case IO_FILE:
{
builtin_stdin=wopen( in->param1.filename,
in->param2.flags, OPEN_MASK );
if( builtin_stdin == -1 )
{
debug( 1,
FILE_ERROR,
in->param1.filename );
wperror( L"open" );
}
else
{
close_stdin = 1;
}
break;
}
case IO_CLOSE:
{
/*
FIXME:
When
requesting
that
stdin
be
closed,
we
really
don't
do
anything. How
should
this
be
handled?
*/
builtin_stdin = -1;
break;
}
default:
{
builtin_stdin=-1;
debug( 1,
_( L"Unknown input redirection type %d" ),
in->io_mode);
break;
}
}
}
}
else
{
builtin_stdin = pipe_read.param1.pipe_fd[0];
}
if( builtin_stdin == -1 )
{
exec_error=1;
break;
}
else
{
int old_out = builtin_out_redirect;
int old_err = builtin_err_redirect;
/*
Since this may be the foreground job, and since
a builtin may execute another foreground job,
we need to pretend to suspend this job while
running the builtin, in order to avoid a
situation where two jobs are running at once.
The reason this is done here, and not by the
relevant builtins, is that this way, the
builtin does not need to know what job it is
part of. It could probably figure that out by
walking the job list, but it seems more robust
to make exec handle things.
*/
builtin_push_io( builtin_stdin );
builtin_out_redirect = has_fd( j->io, 1 );
builtin_err_redirect = has_fd( j->io, 2 );
fg = job_get_flag( j, JOB_FOREGROUND );
job_set_flag( j, JOB_FOREGROUND, 0 );
signal_unblock();
p->status = builtin_run( p->argv, j->io );
builtin_out_redirect=old_out;
builtin_err_redirect=old_err;
signal_block();
/*
Restore the fg flag, which is temporarily set to
false during builtin execution so as not to confuse
some job-handling builtins.
*/
job_set_flag( j, JOB_FOREGROUND, fg );
}
/*
If stdin has been redirected, close the redirection
stream.
*/
if( close_stdin )
{
exec_close( builtin_stdin );
}
break;
}
}
if( exec_error )
{
break;
}
switch( p->type )
{
case INTERNAL_BLOCK:
case INTERNAL_FUNCTION:
{
int status = proc_get_last_status();
/*
Handle output from a block or function. This usually
means do nothing, but in the case of pipes, we have
to buffer such io, since otherwise the internal pipe
buffer might overflow.
*/
if( !io_buffer )
{
/*
No buffer, so we exit directly. This means we
have to manually set the exit status.
*/
if( p->next == 0 )
{
proc_set_last_status( job_get_flag( j, JOB_NEGATE )?(!status):status);
}
p->completed = 1;
break;
}
j->io = io_remove( j->io, io_buffer );
io_buffer_read( io_buffer );
if( io_buffer->param2.out_buffer->used != 0 )
{
pid = exec_fork();
if( pid == 0 )
{
/*
This is the child process. Write out the contents of the pipeline.
*/
p->pid = getpid();
setup_child_process( j, p );
exec_write_and_exit(io_buffer->fd,
io_buffer->param2.out_buffer->buff,
io_buffer->param2.out_buffer->used,
status);
}
else
{
/*
This is the parent process. Store away
information on the child, and possibly give
it control over the terminal.
*/
p->pid = pid;
set_child_group( j, p, 0 );
}
}
else
{
if( p->next == 0 )
{
proc_set_last_status( job_get_flag( j, JOB_NEGATE )?(!status):status);
}
p->completed = 1;
}
io_buffer_destroy( io_buffer );
io_buffer=0;
break;
}
case INTERNAL_BUFFER:
{
pid = exec_fork();
if( pid == 0 )
{
/*
This is the child process. Write out the
contents of the pipeline.
*/
p->pid = getpid();
setup_child_process( j, p );
exec_write_and_exit( 1,
input_redirect->param2.out_buffer->buff,
input_redirect->param2.out_buffer->used,
0);
}
else
{
/*
This is the parent process. Store away
information on the child, and possibly give
it control over the terminal.
*/
p->pid = pid;
set_child_group( j, p, 0 );
}
break;
}
case INTERNAL_BUILTIN:
{
int skip_fork;
/*
Handle output from builtin commands. In the general
case, this means forking of a worker process, that
will write out the contents of the stdout and stderr
buffers to the correct file descriptor. Since
forking is expensive, fish tries to avoid it wehn
possible.
*/
/*
If a builtin didn't produce any output, and it is
not inside a pipeline, there is no need to fork
*/
skip_fork =
( !sb_out->used ) &&
( !sb_err->used ) &&
( !p->next );
/*
If the output of a builtin is to be sent to an internal
buffer, there is no need to fork. This helps out the
performance quite a bit in complex completion code.
*/
io_data_t *io = io_get( j->io, 1 );
int buffer_stdout = io && io->io_mode == IO_BUFFER;
if( ( !sb_err->used ) &&
( !p->next ) &&
( sb_out->used ) &&
( buffer_stdout ) )
{
char *res = wcs2str( (wchar_t *)sb_out->buff );
b_append( io->param2.out_buffer, res, strlen( res ) );
skip_fork = 1;
free( res );
}
for( io = j->io; io; io=io->next )
{
if( io->io_mode == IO_FILE && wcscmp(io->param1.filename, L"/dev/null" ))
{
skip_fork = 0;
}
}
if( skip_fork )
{
p->completed=1;
if( p->next == 0 )
{
debug( 3, L"Set status of %ls to %d using short circut", j->command, p->status );
int status = proc_format_status(p->status);
proc_set_last_status( job_get_flag( j, JOB_NEGATE )?(!status):status );
}
break;
}
/*
Ok, unfortunatly, we have to do a real fork. Bummer.
*/
pid = exec_fork();
if( pid == 0 )
{
/*
This is the child process. Setup redirections,
print correct output to stdout and stderr, and
then exit.
*/
p->pid = getpid();
setup_child_process( j, p );
do_builtin_io( sb_out->used ? (wchar_t *)sb_out->buff : 0, sb_err->used ? (wchar_t *)sb_err->buff : 0 );
exit( p->status );
}
else
{
/*
This is the parent process. Store away
information on the child, and possibly give
it control over the terminal.
*/
p->pid = pid;
set_child_group( j, p, 0 );
}
break;
}
case EXTERNAL:
{
pid = exec_fork();
if( pid == 0 )
{
/*
This is the child process.
*/
p->pid = getpid();
setup_child_process( j, p );
launch_process( p );
/*
launch_process _never_ returns...
*/
}
else
{
/*
This is the parent process. Store away
information on the child, and possibly fice
it control over the terminal.
*/
p->pid = pid;
set_child_group( j, p, 0 );
}
break;
}
}
if( p->type == INTERNAL_BUILTIN )
builtin_pop_io();
/*
Close the pipe the current process uses to read from the
previous process_t
*/
if( pipe_read.param1.pipe_fd[0] >= 0 )
exec_close( pipe_read.param1.pipe_fd[0] );
/*
Set up the pipe the next process uses to read from the
current process_t
*/
if( p->next )
pipe_read.param1.pipe_fd[0] = mypipe[0];
/*
If there is a next process in the pipeline, close the
output end of the current pipe (the surrent child
subprocess already has a copy of the pipe - this makes sure
we don't leak file descriptors either in the shell or in
the children).
*/
if( p->next )
{
exec_close(mypipe[1]);
}
}
/*
The keepalive process is no longer needed, so we terminate it
with extreme prejudice
*/
if( needs_keepalive )
{
kill( keepalive.pid, SIGKILL );
}
signal_unblock();
debug( 3, L"Job is constructed" );
j->io = io_remove( j->io, &pipe_read );
for( tmp = block_io; tmp; tmp=tmp->next )
j->io = io_remove( j->io, tmp );
job_set_flag( j, JOB_CONSTRUCTED, 1 );
if( !job_get_flag( j, JOB_FOREGROUND ) )
{
proc_last_bg_pid = j->pgid;
}
if( !exec_error )
{
job_continue (j, 0);
}
}
void job_continue (job_t *j, int cont)
{
/*
Put job first in the job list
*/
job_promote(j);
job_set_flag( j, JOB_NOTIFIED, 0 );
CHECK_BLOCK();
debug( 4,
L"Continue job %d, gid %d (%ls), %ls, %ls",
j->job_id,
j->pgid,
j->command_wcstr(),
job_is_completed( j )?L"COMPLETED":L"UNCOMPLETED",
is_interactive?L"INTERACTIVE":L"NON-INTERACTIVE" );
if( !job_is_completed( j ) )
{
if( job_get_flag( j, JOB_TERMINAL ) && job_get_flag( j, JOB_FOREGROUND ) )
{
/* Put the job into the foreground. */
int ok;
signal_block();
ok = terminal_give_to_job( j, cont );
signal_unblock();
if( !ok )
return;
}
/*
Send the job a continue signal, if necessary.
*/
if( cont )
{
process_t *p;
for( p=j->first_process; p; p=p->next )
p->stopped=0;
if( job_get_flag( j, JOB_CONTROL ) )
{
if( killpg( j->pgid, SIGCONT ) )
{
wperror( L"killpg (SIGCONT)" );
return;
}
}
else
{
for( p=j->first_process; p; p=p->next )
{
if (kill ( p->pid, SIGCONT) < 0)
{
wperror (L"kill (SIGCONT)");
return;
}
}
}
}
if( job_get_flag( j, JOB_FOREGROUND ) )
{
int quit = 0;
/*
Wait for job to report. Looks a bit ugly because it has to
handle the possibility that a signal is dispatched while
running job_is_stopped().
*/
while( !quit )
{
do
{
got_signal = 0;
quit = job_is_stopped( j ) || job_is_completed( j );
}
while (got_signal && !quit);
if (quit) {
// It's possible that the job will produce output and exit before we've even read from it.
// We'll eventually read the output, but it may be after we've executed subsequent calls
// This is why my prompt colors kept getting screwed up - the builtin echo calls
// were sometimes having their output combined with the set_color calls in the wrong order!
read_try(j);
}
if( !quit )
{
// debug( 1, L"select_try()" );
switch( select_try(j) )
{
case 1:
{
read_try( j );
break;
}
case -1:
{
/*
If there is no funky IO magic, we can use
waitpid instead of handling child deaths
through signals. This gives a rather large
speed boost (A factor 3 startup time
improvement on my 300 MHz machine) on
short-lived jobs.
*/
int status;
pid_t pid = waitpid(-1, &status, WUNTRACED );
if( pid > 0 )
{
handle_child_status( pid, status );
}
else
{
/*
This probably means we got a
signal. A signal might mean that the
terminal emulator sent us a hup
signal to tell is to close. If so,
we should exit.
*/
if( reader_exit_forced() )
{
quit = 1;
}
}
break;
}
}
}
}
}
}
if( job_get_flag( j, JOB_FOREGROUND ) )
{
if( job_is_completed( j ))
{
process_t *p = j->first_process;
while( p->next )
p = p->next;
if( WIFEXITED( p->status ) || WIFSIGNALED(p->status))
{
/*
Mark process status only if we are in the foreground
and the last process in a pipe, and it is not a short circuted builtin
*/
if( p->pid )
{
int status = proc_format_status(p->status);
//wprintf(L"setting status %d for %ls\n", job_get_flag( j, JOB_NEGATE )?!status:status, j->command);
proc_set_last_status( job_get_flag( j, JOB_NEGATE )?!status:status);
}
}
}
/*
Put the shell back in the foreground.
*/
if( job_get_flag( j, JOB_TERMINAL ) && job_get_flag( j, JOB_FOREGROUND ) )
{
int ok;
signal_block();
ok = terminal_return_from_job( j );
signal_unblock();
if( !ok )
return;
}
}
}
/** Save the specified mode to file */
void history_t::save_internal()
{
/* This must be called while locked */
ASSERT_IS_LOCKED(lock);
/* Nothing to do if there's no new items */
if (new_items.empty() && deleted_items.empty())
return;
/* Compact our new items so we don't have duplicates */
this->compact_new_items();
bool ok = true;
wcstring tmp_name = history_filename(name, L".tmp");
if( ! tmp_name.empty() )
{
/* Make an LRU cache to save only the last N elements */
history_lru_cache_t lru(HISTORY_SAVE_MAX);
/* Insert old items in, from old to new. Merge them with our new items, inserting items with earlier timestamps first. */
std::vector<history_item_t>::const_iterator new_item_iter = new_items.begin();
/* Map in existing items (which may have changed out from underneath us, so don't trust our old mmap'd data) */
const char *local_mmap_start = NULL;
size_t local_mmap_size = 0;
if (map_file(name, &local_mmap_start, &local_mmap_size)) {
size_t cursor = 0;
for (;;) {
size_t offset = offset_of_next_item(local_mmap_start, local_mmap_size, &cursor, 0);
/* If we get back -1, we're done */
if (offset == (size_t)(-1))
break;
/* Try decoding an old item */
const history_item_t old_item = history_t::decode_item(local_mmap_start + offset, local_mmap_size - offset);
if (old_item.empty() || is_deleted(old_item))
{
// debug(0, L"Item is deleted : %s\n", old_item.str().c_str());
continue;
}
/* The old item may actually be more recent than our new item, if it came from another session. Insert all new items at the given index with an earlier timestamp. */
for (; new_item_iter != new_items.end(); ++new_item_iter) {
if (new_item_iter->timestamp() < old_item.timestamp()) {
/* This "new item" is in fact older. */
lru.add_item(*new_item_iter);
} else {
/* The new item is not older. */
break;
}
}
/* Now add this old item */
lru.add_item(old_item);
}
munmap((void *)local_mmap_start, local_mmap_size);
}
/* Insert any remaining new items */
for (; new_item_iter != new_items.end(); ++new_item_iter)
{
lru.add_item(*new_item_iter);
}
signal_block();
FILE *out;
if( (out=wfopen( tmp_name, "w" ) ) )
{
/* Write them out */
for (history_lru_cache_t::iterator iter = lru.begin(); iter != lru.end(); ++iter) {
const history_lru_node_t *node = *iter;
if (! node->write_yaml_to_file(out)) {
ok = false;
break;
}
}
if( fclose( out ) || !ok )
{
/*
This message does not have high enough priority to
be shown by default.
*/
debug( 2, L"Error when writing history file" );
}
else
{
wcstring new_name = history_filename(name, wcstring());
wrename(tmp_name, new_name);
}
}
signal_unblock();
/* Make sure we clear all nodes, since this doesn't happen automatically */
lru.evict_all_nodes();
/* We've saved everything, so we have no more unsaved items */
unsaved_item_count = 0;
}
if( ok )
{
/* Our history has been written to the file, so clear our state so we can re-reference the file. */
this->clear_file_state();
}
}