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i3bar: Don't start child unless status_command 

If a command is passed to `start_child` which is NULL, such as in the
case when there is no `status_command` specified in the bar config, do
not start a child process to listen on stdin.

fixes #1140
This commit is contained in:
Tony Crisci 2013-12-26 22:00:06 -05:00 committed by Michael Stapelberg
parent 38b6936c25
commit ac74a63662
3 changed files with 34 additions and 37 deletions
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10
i3bar/src/child.c
View File

@ -452,10 +452,16 @@ void child_write_output(void) {
/* /*
* Start a child-process with the specified command and reroute stdin. * Start a child-process with the specified command and reroute stdin.
* We actually start a $SHELL to execute the command so we don't have to care * We actually start a $SHELL to execute the command so we don't have to care
* about arguments and such * about arguments and such.
*
* If `command' is NULL, such as in the case when no `status_command' is given
* in the bar config, no child will be started.
* *
*/ */
void start_child(char *command) { void start_child(char *command) {
if (command == NULL)
return;
/* Allocate a yajl parser which will be used to parse stdin. */ /* Allocate a yajl parser which will be used to parse stdin. */
memset(&callbacks, '\0', sizeof(yajl_callbacks)); memset(&callbacks, '\0', sizeof(yajl_callbacks));
callbacks.yajl_map_key = stdin_map_key; callbacks.yajl_map_key = stdin_map_key;
@ -478,7 +484,6 @@ void start_child(char *command) {
gen = yajl_gen_alloc(NULL); gen = yajl_gen_alloc(NULL);
#endif #endif
if (command != NULL) {
int pipe_in[2]; /* pipe we read from */ int pipe_in[2]; /* pipe we read from */
int pipe_out[2]; /* pipe we write to */ int pipe_out[2]; /* pipe we write to */
@ -515,7 +520,6 @@ void start_child(char *command) {
break; break;
} }
}
/* We set O_NONBLOCK because blocking is evil in event-driven software */ /* We set O_NONBLOCK because blocking is evil in event-driven software */
fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK); fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK);

4
i3bar/src/config.c
View File

@ -127,10 +127,6 @@ static int config_string_cb(void *params_, const unsigned char *val, unsigned in
} }
if (!strcmp(cur_key, "status_command")) { if (!strcmp(cur_key, "status_command")) {
/* We cannot directly start the child here, because start_child() also
* needs to be run when no command was specified (to setup stdin).
* Therefore we save the command in 'config' and access it later in
* got_bar_config() */
DLOG("command = %.*s\n", len, val); DLOG("command = %.*s\n", len, val);
sasprintf(&config.command, "%.*s", len, val); sasprintf(&config.command, "%.*s", len, val);
return 1; return 1;

3
i3bar/src/ipc.c
View File

@ -100,9 +100,6 @@ void got_bar_config(char *reply) {
/* Resolve color strings to colorpixels and save them, then free the strings. */ /* Resolve color strings to colorpixels and save them, then free the strings. */
init_colors(&(config.colors)); init_colors(&(config.colors));
/* The name of this function is actually misleading. Even if no command is
* specified, this function initiates the watchers to listen on stdin and
* react accordingly */
start_child(config.command); start_child(config.command);
FREE(config.command); FREE(config.command);
} }