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swaybar: separate function for status_command exec

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This commit is contained in:
progandy 2016-01-08 18:24:29 +01:00
parent e2d49afb4a
commit 68da76b745
1 changed files with 53 additions and 20 deletions
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73
swaybar/main.c
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@ -1184,6 +1184,55 @@ void poll_for_update() {
} }
} }
/*
* spawn_sh_cmd forks and executes the specified shell command.
* If infd is set, it receives the fd for the shell's stdin.
* If outfd is set, it recieves the fd for the shell's stdout.
*/
int spawn_sh_cmd(char *command, int *infd, int *outfd) {
int pipeout[2];
int pipein[2];
pid_t pid;
if (infd) {
pipe(pipein);
}
if (outfd) {
pipe(pipeout);
}
pid = fork();
if (pid == 0) {
if (outfd) {
close(pipeout[0]);
dup2(pipeout[1], STDOUT_FILENO);
close(pipeout[1]);
}
if (infd) {
close(pipeout[1]);
dup2(pipeout[0], STDIN_FILENO);
close(pipeout[0]);
}
char *const cmd[] = {
"sh",
"-c",
command,
NULL,
};
execvp(cmd[0], cmd);
return 0;
}
close(pipeout[1]);
close(pipein[0]);
if (outfd) {
*outfd = pipeout[0];
}
if (infd) {
*infd = pipein[1];
}
return pid;
}
int main(int argc, char **argv) { int main(int argc, char **argv) {
char *socket_path = NULL; char *socket_path = NULL;
@ -1270,27 +1319,11 @@ int main(int argc, char **argv) {
bar_ipc_init(desired_output, bar_id); bar_ipc_init(desired_output, bar_id);
if (status_command) { if (status_command) {
int pipefd[2]; pid = spawn_sh_cmd(status_command, NULL, &status_read_fd);
pipe(pipefd); if (pid > 0) {
pid = fork(); fcntl(status_read_fd, F_SETFL, O_NONBLOCK);
if (pid == 0) { line[0] = '\0';
close(pipefd[0]);
dup2(pipefd[1], STDOUT_FILENO);
close(pipefd[1]);
char *const cmd[] = {
"sh",
"-c",
status_command,
NULL,
};
execvp(cmd[0], cmd);
return 0;
} }
close(pipefd[1]);
status_read_fd = pipefd[0];
fcntl(status_read_fd, F_SETFL, O_NONBLOCK);
line[0] = '\0';
} }
signal(SIGTERM, sig_handler); signal(SIGTERM, sig_handler);