/*
* Pipe stream to or from process. Similar to popen(), only much faster.
*
* This is simpler than popen_noshell() but is more INSECURE.
* Since shells have very complicated expansion, quoting and word splitting algorithms, we do NOT try to re-implement them here.
* This function does NOT support any special characters. It will immediately return an error if such symbols are encountered in "command".
* The "command" is split only by space and tab delimiters. The special symbols are pre-defined in popen_bash_meta_characters[].
* The only special characters supported are single and double quotes. You can enclose arguments in quotes and they should be splitted correctly.
*
* If possible, use popen_noshell() because of its better security.
*
* "command" is the command and its arguments to be executed. The command is searched within the PATH environment variable.
* The whole "command" string is parsed and splitted, so that it can be directly given to popen_noshell() and resp. to exec().
* This parsing is very simple and may contain bugs (see above). If possible, use popen_noshell() directly.
* "type" specifies if we are reading from the STDOUT or writing to the STDIN of the executed command. Use "r" for reading, "w" for writing.
* "pid" is a pointer to an interger. The PID of the child process is stored there.
*
* Returns NULL on any error, "errno" is set appropriately.
* On success, a stream pointer is returned.
* When you are done working with the stream, you have to close it by calling pclose_noshell(), or else you will leave zombie processes.
*/
FILE *popen_noshell_compat(const char *command, const char *type, struct popen_noshell_pass_to_pclose *pclose_arg) {
char **argv;
FILE *fp;
char *to_free;
argv = popen_noshell_split_command_to_argv(command, &to_free);
if (!argv) {
if (to_free) free(to_free);
return NULL;
}
fp = popen_noshell(argv[0], (const char * const *)argv, type, pclose_arg, 0);
free(to_free);
free(argv);
return fp;
}
int main(int argc, char* argv[]) {
char *p[] = {"echo", "pokemon", NULL};
char buffer[LSIZE] = {0};
FILE *fp = popen_noshell(p, "r");
while (fgets(buffer, LSIZE, fp)) {
printf("%s", buffer);
}
if (ferror(fp)) {
printf("omg error");
}
pclose_noshell(fp);
return 0;
}
static int openInputDevice(lua_State *L) {
const char* inputdevice = luaL_checkstring(L, 1);
#ifndef EMULATE_READER
int fd;
int childpid;
fd = findFreeFdSlot();
if(fd == -1) {
return luaL_error(L, "no free slot for new input device <%s>", inputdevice);
}
if(!strcmp("fake_events", inputdevice)) {
/* special case: the power slider */
int pipefd[2];
pipe(pipefd);
if((childpid = fork()) == -1) {
return luaL_error(L, "cannot fork() slider event listener");
}
if(childpid == 0) {
// We send a SIGTERM to this child on exit, trap it to kill lipc properly.
signal(SIGTERM, slider_handler);
FILE *fp;
char std_out[256];
int status;
struct input_event ev;
__u16 key_code = 10000;
close(pipefd[0]);
ev.type = EV_KEY;
ev.code = key_code;
ev.value = 1;
/* listen power slider events (listen for ever for multiple events) */
char *argv[] = {"lipc-wait-event", "-m", "-s", "0", "com.lab126.powerd", "goingToScreenSaver,outOfScreenSaver,charging,notCharging", (char *) NULL};
/* @TODO 07.06 2012 (houqp)
* plugin and out event can only be watched by:
lipc-wait-event com.lab126.hal usbPlugOut,usbPlugIn
*/
fp = popen_noshell("lipc-wait-event", (const char * const *)argv, "r", &pclose_arg, 0);
if (!fp) {
err(EXIT_FAILURE, "popen_noshell()");
}
/* Flush to get rid of buffering issues? */
fflush(fp);
while(fgets(std_out, sizeof(std_out)-1, fp)) {
if(std_out[0] == 'g') {
ev.code = CODE_IN_SAVER;
} else if(std_out[0] == 'o') {
ev.code = CODE_OUT_SAVER;
} else if((std_out[0] == 'u') && (std_out[7] == 'I')) {
ev.code = CODE_USB_PLUG_IN;
} else if((std_out[0] == 'u') && (std_out[7] == 'O')) {
ev.code = CODE_USB_PLUG_OUT;
} else if(std_out[0] == 'c') {
ev.code = CODE_CHARGING;
} else if(std_out[0] == 'n') {
ev.code = CODE_NOT_CHARGING;
} else {
printf("Unrecognized event.\n");
}
/* fill event struct */
gettimeofday(&ev.time, NULL);
/* generate event */
if(write(pipefd[1], &ev, sizeof(struct input_event)) == -1) {
printf("Failed to generate event.\n");
}
}
status = pclose_noshell(&pclose_arg);
if (status == -1) {
err(EXIT_FAILURE, "pclose_noshell()");
} else {
if (WIFEXITED(status)) {
printf("lipc-wait-event exited normally with status: %d\n", WEXITSTATUS(status));
} else if (WIFSIGNALED(status)) {
printf("lipc-wait-event was killed by signal %d\n", WTERMSIG(status));
} else if (WIFSTOPPED(status)) {
printf("lipc-wait-event was stopped by signal %d\n", WSTOPSIG(status));
} else if (WIFCONTINUED(status)) {
printf("lipc-wait-event continued\n");
}
}
// We're done, go away :).
_exit(EXIT_SUCCESS);
} else {
close(pipefd[1]);
inputfds[fd] = pipefd[0];
slider_pid = childpid;
}
} else {
inputfds[fd] = open(inputdevice, O_RDONLY | O_NONBLOCK, 0);
if(inputfds[fd] != -1) {
ioctl(inputfds[fd], EVIOCGRAB, 1);
return 0;
} else {
return luaL_error(L, "error opening input device <%s>: %d", inputdevice, errno);
}
}
#else
if(SDL_Init(SDL_INIT_VIDEO) < 0) {
return luaL_error(L, "cannot initialize SDL.");
}
SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);
/* we only use inputfds[0] in emu mode, because we only have one
* fake device so far. */
inputfds[0] = open(inputdevice, O_RDWR | O_NONBLOCK);
if (inputfds < 0) {
return luaL_error(L, "error opening input device <%s>: %d", inputdevice, errno);
}
#endif
return 0;
}