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i3bar: Don't start child unless status_command

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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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64
i3bar/src/child.c
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@ -452,10 +452,16 @@ void child_write_output(void) {
/*
* 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
* 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) {
if (command == NULL)
return;
/* Allocate a yajl parser which will be used to parse stdin. */
memset(&callbacks, '\0', sizeof(yajl_callbacks));
callbacks.yajl_map_key = stdin_map_key;
@ -478,43 +484,41 @@ void start_child(char *command) {
gen = yajl_gen_alloc(NULL);
#endif
if (command != NULL) {
int pipe_in[2]; /* pipe we read from */
int pipe_out[2]; /* pipe we write to */
int pipe_in[2]; /* pipe we read from */
int pipe_out[2]; /* pipe we write to */
if (pipe(pipe_in) == -1)
err(EXIT_FAILURE, "pipe(pipe_in)");
if (pipe(pipe_out) == -1)
err(EXIT_FAILURE, "pipe(pipe_out)");
if (pipe(pipe_in) == -1)
err(EXIT_FAILURE, "pipe(pipe_in)");
if (pipe(pipe_out) == -1)
err(EXIT_FAILURE, "pipe(pipe_out)");
child.pid = fork();
switch (child.pid) {
case -1:
ELOG("Couldn't fork(): %s\n", strerror(errno));
exit(EXIT_FAILURE);
case 0:
/* Child-process. Reroute streams and start shell */
child.pid = fork();
switch (child.pid) {
case -1:
ELOG("Couldn't fork(): %s\n", strerror(errno));
exit(EXIT_FAILURE);
case 0:
/* Child-process. Reroute streams and start shell */
close(pipe_in[0]);
close(pipe_out[1]);
close(pipe_in[0]);
close(pipe_out[1]);
dup2(pipe_in[1], STDOUT_FILENO);
dup2(pipe_out[0], STDIN_FILENO);
dup2(pipe_in[1], STDOUT_FILENO);
dup2(pipe_out[0], STDIN_FILENO);
setpgid(child.pid, 0);
execl(_PATH_BSHELL, _PATH_BSHELL, "-c", command, (char*) NULL);
return;
default:
/* Parent-process. Reroute streams */
setpgid(child.pid, 0);
execl(_PATH_BSHELL, _PATH_BSHELL, "-c", command, (char*) NULL);
return;
default:
/* Parent-process. Reroute streams */
close(pipe_in[1]);
close(pipe_out[0]);
close(pipe_in[1]);
close(pipe_out[0]);
dup2(pipe_in[0], STDIN_FILENO);
child_stdin = pipe_out[1];
dup2(pipe_in[0], STDIN_FILENO);
child_stdin = pipe_out[1];
break;
}
break;
}
/* We set O_NONBLOCK because blocking is evil in event-driven software */