/* Runs the command in shell and returns its output (joined standard output and
* standard error streams). All trailing newline characters are stripped to
* allow easy appending to command output. Returns the output. */
static var_t
system_builtin(const call_info_t *call_info)
{
var_t result;
char *cmd;
FILE *cmd_stream;
size_t cmd_out_len;
var_val_t var_val;
cmd = var_to_string(call_info->argv[0]);
cmd_stream = read_cmd_output(cmd);
free(cmd);
ui_cancellation_enable();
var_val.string = read_nonseekable_stream(cmd_stream, &cmd_out_len);
ui_cancellation_disable();
fclose(cmd_stream);
if(var_val.string == NULL)
{
var_val.string = "";
return var_new(VTYPE_STRING, var_val);
}
/* Remove trailing new line characters. */
while(cmd_out_len != 0U && var_val.string[cmd_out_len - 1] == '\n')
{
var_val.string[cmd_out_len - 1] = '\0';
--cmd_out_len;
}
result = var_new(VTYPE_STRING, var_val);
free(var_val.string);
return result;
}
int
capture_output_to_menu(FileView *view, const char cmd[], menu_info *m)
{
FILE *file, *err;
char *line = NULL;
int x;
pid_t pid;
LOG_INFO_MSG("Capturing output of the command to a menu: %s", cmd);
pid = background_and_capture((char *)cmd, &file, &err);
if(pid == (pid_t)-1)
{
show_error_msgf("Trouble running command", "Unable to run: %s", cmd);
return 0;
}
show_progress("", 0);
ui_cancellation_reset();
ui_cancellation_enable();
wait_for_data_from(pid, file, 0);
x = 0;
while((line = read_line(file, line)) != NULL)
{
char *expanded_line;
show_progress("Loading menu", 1000);
m->items = realloc(m->items, sizeof(char *)*(x + 1));
expanded_line = expand_tabulation_a(line, cfg.tab_stop);
if(expanded_line != NULL)
{
m->items[x++] = expanded_line;
}
wait_for_data_from(pid, file, 0);
}
m->len = x;
ui_cancellation_disable();
fclose(file);
print_errors(err);
if(ui_cancellation_requested())
{
append_to_string(&m->title, "(cancelled) ");
append_to_string(&m->empty_msg, " (cancelled)");
}
return display_menu(m, view);
}
/* Deletes current item from the trash. */
static KHandlerResponse
delete_current(menu_data_t *m)
{
int ret;
io_args_t args = {
.arg1.path = trash_list[m->pos].trash_name,
.cancellation.hook = &ui_cancellation_hook,
};
ioe_errlst_init(&args.result.errors);
ui_cancellation_enable();
ret = ior_rm(&args);
ui_cancellation_disable();
if(ret != 0)
{
char *const errors = ioe_errlst_to_str(&args.result.errors);
ioe_errlst_free(&args.result.errors);
show_error_msg("File deletion error", errors);
free(errors);
return KHR_UNHANDLED;
}
ioe_errlst_free(&args.result.errors);
remove_current_item(m->state);
return KHR_REFRESH_WINDOW;
}
/* Implementation of cancellation hook for I/O unit. */
static int
ui_cancellation_hook(void *arg)
{
return ui_cancellation_requested();
}
int
background_and_wait_for_errors(char cmd[], int cancellable)
{
#ifndef _WIN32
pid_t pid;
int error_pipe[2];
int result = 0;
if(pipe(error_pipe) != 0)
{
error_msg("File pipe error", "Error creating pipe");
return -1;
}
(void)set_sigchld(1);
if((pid = fork()) == -1)
{
(void)set_sigchld(0);
return -1;
}
if(pid == 0)
{
(void)set_sigchld(0);
run_from_fork(error_pipe, 1, cmd);
}
else
{
char buf[80*10];
char linebuf[80];
int nread = 0;
close(error_pipe[1]); /* Close write end of pipe. */
if(cancellable)
{
ui_cancellation_enable();
}
wait_for_data_from(pid, NULL, error_pipe[0]);
buf[0] = '\0';
while((nread = read(error_pipe[0], linebuf, sizeof(linebuf) - 1)) > 0)
{
const int read_empty_line = nread == 1 && linebuf[0] == '\n';
result = -1;
linebuf[nread] = '\0';
if(!read_empty_line)
{
strncat(buf, linebuf, sizeof(buf) - strlen(buf) - 1);
}
wait_for_data_from(pid, NULL, error_pipe[0]);
}
close(error_pipe[0]);
if(cancellable)
{
ui_cancellation_disable();
}
if(result != 0)
{
error_msg("Background Process Error", buf);
}
else
{
/* Don't use "const int" variables with WEXITSTATUS() as they cause
* compilation errors in case __USE_BSD is defined. Anonymous type with
* "const int" is composed via compound literal expression. */
int status = get_proc_exit_status(pid);
result = (status != -1 && WIFEXITED(status)) ? WEXITSTATUS(status) : -1;
}
}
(void)set_sigchld(0);
return result;
#else
return -1;
#endif
}
/* Checks status of the job. Processes error stream or checks whether process
* is still running. */
static void
job_check(job_t *const job)
{
#ifndef _WIN32
fd_set ready;
int max_fd = 0;
struct timeval ts = { .tv_sec = 0, .tv_usec = 1000 };
/* Setup pipe for reading */
FD_ZERO(&ready);
if(job->fd >= 0)
{
FD_SET(job->fd, &ready);
max_fd = job->fd;
}
if(job->error != NULL)
{
if(!job->skip_errors)
{
job->skip_errors = prompt_error_msg("Background Process Error",
job->error);
}
free(job->error);
job->error = NULL;
}
while(select(max_fd + 1, &ready, NULL, NULL, &ts) > 0)
{
char err_msg[ERR_MSG_LEN];
const ssize_t nread = read(job->fd, err_msg, sizeof(err_msg) - 1);
if(nread == 0)
{
break;
}
else if(nread > 0 && !job->skip_errors)
{
err_msg[nread] = '\0';
job->skip_errors = prompt_error_msg("Background Process Error", err_msg);
}
}
#else
DWORD retcode;
if(GetExitCodeProcess(job->hprocess, &retcode) != 0)
{
if(retcode != STILL_ACTIVE)
{
job->running = 0;
}
}
#endif
}
/* Frees resources allocated by the job as well as the job_t structure itself.
* The job can be NULL. */
static void
job_free(job_t *const job)
{
if(job == NULL)
{
return;
}
if(job->type != BJT_COMMAND)
{
pthread_mutex_destroy(&job->bg_op_guard);
}
#ifndef _WIN32
if(job->fd != NO_JOB_ID)
{
close(job->fd);
}
#else
if(job->hprocess != NO_JOB_ID)
{
CloseHandle(job->hprocess);
}
#endif
free(job->bg_op.descr);
free(job->cmd);
free(job);
}
/* Used for FUSE mounting and unmounting only. */
int
background_and_wait_for_status(char cmd[], int cancellable, int *cancelled)
{
#ifndef _WIN32
pid_t pid;
int status;
if(cancellable)
{
*cancelled = 0;
}
if(cmd == NULL)
{
return 1;
}
(void)set_sigchld(1);
pid = fork();
if(pid == (pid_t)-1)
{
(void)set_sigchld(0);
LOG_SERROR_MSG(errno, "Forking has failed.");
return -1;
}
if(pid == (pid_t)0)
{
extern char **environ;
(void)set_sigchld(0);
(void)execve(get_execv_path(cfg.shell), make_execv_array(cfg.shell, cmd),
environ);
_Exit(127);
}
if(cancellable)
{
ui_cancellation_enable();
}
while(waitpid(pid, &status, 0) == -1)
{
if(errno != EINTR)
{
LOG_SERROR_MSG(errno, "Failed waiting for process: %" PRINTF_ULL,
(unsigned long long)pid);
status = -1;
break;
}
process_cancel_request(pid);
}
if(cancellable)
{
if(ui_cancellation_requested())
{
*cancelled = 1;
}
ui_cancellation_disable();
}
(void)set_sigchld(0);
return status;
#else
return -1;
#endif
}
int
compare_two_panes(CompareType ct, ListType lt, int group_paths, int skip_empty)
{
int next_id = 1;
entries_t curr, other;
trie_t *const trie = trie_create();
ui_cancellation_reset();
ui_cancellation_enable();
curr = make_diff_list(trie, curr_view, &next_id, ct, skip_empty, 0);
other = make_diff_list(trie, other_view, &next_id, ct, skip_empty,
lt == LT_DUPS);
ui_cancellation_disable();
trie_free_with_data(trie, &free_compare_records);
/* Clear progress message displayed by make_diff_list(). */
ui_sb_quick_msg_clear();
if(ui_cancellation_requested())
{
free_dir_entries(curr_view, &curr.entries, &curr.nentries);
free_dir_entries(other_view, &other.entries, &other.nentries);
status_bar_message("Comparison has been cancelled");
return 1;
}
if(!group_paths || lt != LT_ALL)
{
/* Sort both lists according to unique file numbers to group identical files
* (sorting is stable, tags are set in make_diff_list()). */
qsort(curr.entries, curr.nentries, sizeof(*curr.entries), &id_sorter);
qsort(other.entries, other.nentries, sizeof(*other.entries), &id_sorter);
}
if(lt == LT_UNIQUE)
{
make_unique_lists(curr, other);
return 0;
}
if(lt == LT_DUPS)
{
leave_only_dups(&curr, &other);
}
flist_custom_start(curr_view, lt == LT_ALL ? "diff" : "dups diff");
flist_custom_start(other_view, lt == LT_ALL ? "diff" : "dups diff");
fill_side_by_side(curr, other, group_paths);
if(flist_custom_finish(curr_view, CV_DIFF, 0) != 0)
{
show_error_msg("Comparison", "No results to display");
return 0;
}
if(flist_custom_finish(other_view, CV_DIFF, 0) != 0)
{
assert(0 && "The error shouldn't be happening here.");
}
curr_view->list_pos = 0;
other_view->list_pos = 0;
curr_view->custom.diff_cmp_type = ct;
other_view->custom.diff_cmp_type = ct;
curr_view->custom.diff_path_group = group_paths;
other_view->custom.diff_path_group = group_paths;
assert(curr_view->list_rows == other_view->list_rows &&
"Diff views must be in sync!");
ui_view_schedule_redraw(curr_view);
ui_view_schedule_redraw(other_view);
return 0;
}
int
compare_one_pane(FileView *view, CompareType ct, ListType lt, int skip_empty)
{
int i, dup_id;
FileView *other = (view == curr_view) ? other_view : curr_view;
const char *const title = (lt == LT_ALL) ? "compare"
: (lt == LT_DUPS) ? "dups" : "nondups";
int next_id = 1;
entries_t curr;
trie_t *trie = trie_create();
ui_cancellation_reset();
ui_cancellation_enable();
curr = make_diff_list(trie, view, &next_id, ct, skip_empty, 0);
ui_cancellation_disable();
trie_free_with_data(trie, &free_compare_records);
/* Clear progress message displayed by make_diff_list(). */
ui_sb_quick_msg_clear();
if(ui_cancellation_requested())
{
free_dir_entries(view, &curr.entries, &curr.nentries);
status_bar_message("Comparison has been cancelled");
return 1;
}
qsort(curr.entries, curr.nentries, sizeof(*curr.entries), &id_sorter);
flist_custom_start(view, title);
dup_id = -1;
next_id = 0;
for(i = 0; i < curr.nentries; ++i)
{
dir_entry_t *entry = &curr.entries[i];
if(lt == LT_ALL)
{
flist_custom_put(view, entry);
continue;
}
if(entry->id == dup_id)
{
put_or_free(view, entry, next_id, lt == LT_DUPS);
continue;
}
dup_id = (i < curr.nentries - 1 && entry[0].id == entry[1].id)
? entry->id
: -1;
if(entry->id == dup_id)
{
put_or_free(view, entry, ++next_id, lt == LT_DUPS);
continue;
}
put_or_free(view, entry, next_id, lt == LT_UNIQUE);
}
/* Entries' data has been moved out of them or freed, so need to free only the
* list. */
dynarray_free(curr.entries);
if(flist_custom_finish(view, lt == LT_UNIQUE ? CV_REGULAR : CV_COMPARE,
0) != 0)
{
show_error_msg("Comparison", "No results to display");
return 0;
}
/* Leave the other pane, if it's in the CV_DIFF mode, two panes are needed for
* this. */
if(other->custom.type == CV_DIFF)
{
cd_updir(other, 1);
}
view->list_pos = 0;
ui_view_schedule_redraw(view);
return 0;
}