1 /* -*- mode: c; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*-
2 * vim: ts=4 sw=4 noet ai cindent syntax=c
4 * Conky, a system monitor, based on torsmo
6 * Any original torsmo code is licensed under the BSD license
8 * All code written since the fork of torsmo is licensed under the GPL
10 * Please see COPYING for details
12 * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
13 * Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
15 * All rights reserved.
17 * This program is free software: you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation, either version 3 of the License, or
20 * (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program. If not, see <http://www.gnu.org/licenses/>.
35 #include "text_object.h"
37 #include <sys/types.h>
46 timed_thread *p_timed_thread;
49 /* FIXME: this will probably not work, since the variable is being reused
50 * between different text objects. So when a process really hangs, it's PID
51 * will be overwritten at the next iteration. */
54 //our own implementation of popen, the difference : the value of 'childpid' will be filled with
55 //the pid of the running 'command'. This is useful if want to kill it when it hangs while reading
56 //or writing to it. We have to kill it because pclose will wait until the process dies by itself
57 static FILE* pid_popen(const char *command, const char *mode, pid_t *child) {
59 int parentend, childend;
61 //by running pipe after the strcmp's we make sure that we don't have to create a pipe
62 //and close the ends if mode is something illegal
63 if(strcmp(mode, "r") == 0) {
69 } else if(strcmp(mode, "w") == 0) {
83 } else if(*child > 0) {
85 waitpid(*child, NULL, 0);
87 //don't read from both stdin and pipe or write to both stdout and pipe
88 if(childend == ends[0]) {
93 dup(childend); //by dupping childend, the returned fd will have close-on-exec turned off
94 execl("/bin/sh", "sh", "-c", command, (char *) NULL);
95 _exit(EXIT_FAILURE); //child should die here, (normally execl will take care of this but it can fail)
97 return fdopen(parentend, mode);
100 //remove backspaced chars, example: "dog^H^H^Hcat" becomes "cat"
101 //string has to end with \0 and it's length should fit in a int
103 static void remove_deleted_chars(char *string){
105 while(string[i] != 0){
106 if(string[i] == BACKSPACE){
108 strcpy( &(string[i-1]), &(string[i+1]) );
110 }else strcpy( &(string[i]), &(string[i+1]) ); //necessary for ^H's at the start of a string
115 static inline double get_barnum(char *buf)
127 if (sscanf(buf, "%lf", &barnum) == 0) {
128 NORM_ERR("reading exec value failed (perhaps it's not the "
132 if (barnum > 100.0 || barnum < 0.0) {
133 NORM_ERR("your exec value is not between 0 and 100, "
134 "therefore it will be ignored");
140 static inline void read_exec(const char *data, char *buf, const int size)
144 memset(buf, 0, size);
149 alarm(update_interval);
150 fp = pid_popen(data, "r", &childpid);
154 length = fread(buf, 1, size, fp);
157 if (length > 0 && buf[length - 1] == '\n') {
158 buf[length - 1] = '\0';
166 static void *threaded_exec(void *) __attribute__((noreturn));
168 static void *threaded_exec(void *arg)
171 struct text_object *obj = arg;
172 struct execi_data *ed = obj->data.opaque;
175 buff = malloc(text_buffer_size);
176 read_exec(ed->cmd, buff, text_buffer_size);
184 timed_thread_lock(ed->p_timed_thread);
188 timed_thread_unlock(ed->p_timed_thread);
189 if (timed_thread_test(ed->p_timed_thread, 0)) {
190 timed_thread_exit(ed->p_timed_thread);
196 /* check the execi fields and return true if the given interval has passed */
197 static int time_to_update(struct execi_data *ed)
201 if (current_update_time - ed->last_update >= ed->interval)
206 void scan_exec_arg(struct text_object *obj, const char *arg)
208 obj->data.s = strndup(arg ? arg : "", text_buffer_size);
211 void scan_pre_exec_arg(struct text_object *obj, const char *arg)
215 obj->type = OBJ_text;
216 read_exec(arg, buf, sizeof(buf));
217 obj->data.s = strndup(buf, text_buffer_size);
220 void scan_execi_arg(struct text_object *obj, const char *arg)
222 struct execi_data *ed;
225 ed = malloc(sizeof(struct execi_data));
226 memset(ed, 0, sizeof(struct execi_data));
228 if (sscanf(arg, "%f %n", &ed->interval, &n) <= 0) {
229 NORM_ERR("${execi* <interval> command}");
233 ed->cmd = strndup(arg + n, text_buffer_size);
234 obj->data.opaque = ed;
237 void print_exec(struct text_object *obj, char *p, int p_max_size)
239 read_exec(obj->data.s, p, p_max_size);
240 remove_deleted_chars(p);
243 void print_execp(struct text_object *obj, char *p, int p_max_size)
245 struct information *tmp_info;
246 struct text_object subroot;
248 read_exec(obj->data.s, p, p_max_size);
250 tmp_info = malloc(sizeof(struct information));
251 memcpy(tmp_info, &info, sizeof(struct information));
252 parse_conky_vars(&subroot, p, p, tmp_info);
254 free_text_objects(&subroot, 1);
258 void print_execi(struct text_object *obj, char *p, int p_max_size)
260 struct execi_data *ed = obj->data.opaque;
265 if (time_to_update(ed)) {
267 ed->buffer = malloc(text_buffer_size);
268 read_exec(ed->cmd, ed->buffer, text_buffer_size);
269 ed->last_update = current_update_time;
271 snprintf(p, p_max_size, "%s", ed->buffer);
274 void print_execpi(struct text_object *obj, char *p)
276 struct execi_data *ed = obj->data.opaque;
277 struct text_object subroot;
278 struct information *tmp_info;
283 tmp_info = malloc(sizeof(struct information));
284 memcpy(tmp_info, &info, sizeof(struct information));
286 if (!time_to_update(ed)) {
287 parse_conky_vars(&subroot, ed->buffer, p, tmp_info);
291 FILE *fp = pid_popen(ed->cmd, "r", &childpid);
294 ed->buffer = malloc(text_buffer_size);
296 length = fread(ed->buffer, 1, text_buffer_size, fp);
300 output[length] = '\0';
301 if (length > 0 && output[length - 1] == '\n') {
302 output[length - 1] = '\0';
305 parse_conky_vars(&subroot, ed->buffer, p, tmp_info);
306 ed->last_update = current_update_time;
308 free_text_objects(&subroot, 1);
312 void print_texeci(struct text_object *obj, char *p, int p_max_size)
314 struct execi_data *ed = obj->data.opaque;
319 if (!ed->p_timed_thread) {
320 ed->p_timed_thread = timed_thread_create(&threaded_exec,
321 (void *) obj, ed->interval * 1000000);
322 if (!ed->p_timed_thread) {
323 NORM_ERR("Error creating texeci timed thread");
326 * note that we don't register this thread with the
327 * timed_thread list, because we destroy it manually
329 if (timed_thread_run(ed->p_timed_thread)) {
330 NORM_ERR("Error running texeci timed thread");
333 timed_thread_lock(ed->p_timed_thread);
334 snprintf(p, p_max_size, "%s", ed->buffer);
335 timed_thread_unlock(ed->p_timed_thread);
340 void print_execgauge(struct text_object *obj, char *p, int p_max_size)
344 read_exec(obj->data.s, p, p_max_size);
345 barnum = get_barnum(p); /*using the same function*/
349 new_gauge(p, obj->a, obj->b, round_to_int(barnum * 255.0));
353 void print_execgraph(struct text_object *obj, char *p, int p_max_size)
355 char showaslog = FALSE;
356 char tempgrad = FALSE;
358 struct execi_data *ed = obj->data.opaque;
366 if (strstr(cmd, " "TEMPGRAD) && strlen(cmd) > strlen(" "TEMPGRAD)) {
368 cmd += strlen(" "TEMPGRAD);
370 if (strstr(cmd, " "LOGGRAPH) && strlen(cmd) > strlen(" "LOGGRAPH)) {
372 cmd += strlen(" "LOGGRAPH);
374 read_exec(cmd, p, p_max_size);
375 barnum = get_barnum(p);
378 new_graph(p, obj->a, obj->b, obj->c, obj->d, round_to_int(barnum),
379 100, 1, showaslog, tempgrad);
383 void print_execigraph(struct text_object *obj, char *p, int p_max_size)
385 struct execi_data *ed = obj->data.opaque;
390 if (time_to_update(ed)) {
392 char showaslog = FALSE;
393 char tempgrad = FALSE;
396 if (strstr(cmd, " "TEMPGRAD) && strlen(cmd) > strlen(" "TEMPGRAD)) {
398 cmd += strlen(" "TEMPGRAD);
400 if (strstr(cmd, " "LOGGRAPH) && strlen(cmd) > strlen(" "LOGGRAPH)) {
402 cmd += strlen(" "LOGGRAPH);
404 obj->char_a = showaslog;
405 obj->char_b = tempgrad;
406 read_exec(cmd, p, p_max_size);
407 barnum = get_barnum(p);
412 ed->last_update = current_update_time;
414 new_graph(p, obj->a, obj->b, obj->c, obj->d, (int) (obj->f), 100, 1, obj->char_a, obj->char_b);
417 void print_execigauge(struct text_object *obj, char *p, int p_max_size)
419 struct execi_data *ed = obj->data.opaque;
424 if (time_to_update(ed)) {
427 read_exec(ed->cmd, p, p_max_size);
428 barnum = get_barnum(p);
431 obj->f = 255 * barnum / 100.0;
433 ed->last_update = current_update_time;
435 new_gauge(p, obj->a, obj->b, round_to_int(obj->f));
439 void print_execbar(struct text_object *obj, char *p, int p_max_size)
442 read_exec(obj->data.s, p, p_max_size);
443 barnum = get_barnum(p);
447 if(output_methods & TO_X) {
449 new_bar(p, obj->a, obj->b, round_to_int(barnum * 255.0));
453 if(!obj->a) obj->a = DEFAULT_BAR_WIDTH_NO_X;
454 new_bar_in_shell(p, p_max_size, barnum, obj->a);
459 void print_execibar(struct text_object *obj, char *p, int p_max_size)
461 struct execi_data *ed = obj->data.opaque;
467 if (time_to_update(ed)) {
468 read_exec(ed->cmd, p, p_max_size);
469 barnum = get_barnum(p);
474 ed->last_update = current_update_time;
477 if(output_methods & TO_X) {
478 new_bar(p, obj->a, obj->b, round_to_int(obj->f * 2.55));
482 if(!obj->a) obj->a = DEFAULT_BAR_WIDTH_NO_X;
483 new_bar_in_shell(p, p_max_size, round_to_int(obj->f), obj->a);
487 void free_exec(struct text_object *obj)
495 void free_execi(struct text_object *obj)
497 struct execi_data *ed = obj->data.opaque;
502 if (ed->p_timed_thread)
503 timed_thread_destroy(ed->p_timed_thread, &ed->p_timed_thread);
508 free(obj->data.opaque);
509 obj->data.opaque = NULL;