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lite-xl/src/api/process.c

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#include "api.h"
#include <string.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <SDL.h>
#include <SDL_thread.h>
#include <assert.h>
#if _WIN32
// https://stackoverflow.com/questions/60645/overlapped-i-o-on-anonymous-pipe
// https://docs.microsoft.com/en-us/windows/win32/procthread/creating-a-child-process-with-redirected-input-and-output
#include <windows.h>
#else
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/wait.h>
#endif
#define READ_BUF_SIZE 2048
#define PROCESS_TERM_TRIES 3
#define PROCESS_TERM_DELAY 50
#if _WIN32
typedef HANDLE process_stream_handle;
typedef HANDLE process_handle;
#else
typedef int process_stream_handle;
typedef pid_t process_handle;
#endif
typedef struct {
bool running, detached;
int returncode, deadline;
long pid;
#if _WIN32
PROCESS_INFORMATION process_information;
OVERLAPPED overlapped[2];
bool reading[2];
char buffer[2][READ_BUF_SIZE];
#endif
process_stream_handle child_pipes[3][2];
} process_t;
typedef struct process_kill_s {
int tries;
uint32_t start_time;
process_handle handle;
struct process_kill_s *next;
} process_kill_t;
typedef struct {
bool stop;
SDL_mutex *mutex;
SDL_cond *has_work, *work_done;
process_kill_t *head;
process_kill_t *tail;
} process_kill_list_t;
typedef enum {
SIGNAL_KILL,
SIGNAL_TERM,
SIGNAL_INTERRUPT
} signal_e;
typedef enum {
WAIT_NONE = 0,
WAIT_DEADLINE = -1,
WAIT_INFINITE = -2
} wait_e;
typedef enum {
STDIN_FD,
STDOUT_FD,
STDERR_FD,
// Special values for redirection.
REDIRECT_DEFAULT = -1,
REDIRECT_DISCARD = -2,
REDIRECT_PARENT = -3,
} filed_e;
static process_kill_list_t kill_list = { 0 };
static SDL_Thread *kill_list_thread = NULL;
#ifdef _WIN32
static volatile long PipeSerialNumber;
static void close_fd(HANDLE* handle) { if (*handle) CloseHandle(*handle); *handle = INVALID_HANDLE_VALUE; }
#define PROCESS_GET_HANDLE(P) ((P)->process_information.hProcess)
#else
static void close_fd(int* fd) { if (*fd) close(*fd); *fd = 0; }
#define PROCESS_GET_HANDLE(P) ((P)->pid)
#endif
static void kill_list_free(process_kill_list_t *list) {
process_kill_t *node, *temp;
SDL_DestroyMutex(list->mutex);
SDL_DestroyCond(list->has_work);
SDL_DestroyCond(list->work_done);
node = list->head;
while (node) {
temp = node;
node = node->next;
free(temp);
}
}
static bool kill_list_init(process_kill_list_t *list) {
list->mutex = SDL_CreateMutex();
list->has_work = SDL_CreateCond();
list->work_done = SDL_CreateCond();
list->head = list->tail = NULL;
list->stop = false;
if (!list->mutex || !list->has_work || !list->work_done) {
kill_list_free(list);
return false;
}
return true;
}
static void kill_list_push(process_kill_list_t *list, process_kill_t *task) {
if (!list) return;
task->next = NULL;
if (list->tail) {
list->tail->next = task;
list->tail = task;
} else {
list->head = list->tail = task;
}
}
static void kill_list_pop(process_kill_list_t *list) {
if (!list || !list->head) return;
process_kill_t *head = list->head;
list->head = list->head->next;
if (!list->head) list->tail = NULL;
head->next = NULL;
}
static void kill_list_wait_all(process_kill_list_t *list) {
SDL_LockMutex(list->mutex);
// wait until list is empty
while (list->head)
SDL_CondWait(list->work_done, list->mutex);
// tell the worker to stop
list->stop = true;
SDL_CondSignal(list->has_work);
SDL_UnlockMutex(list->mutex);
}
static void process_handle_close(process_handle *handle) {
#ifdef _WIN32
if (*handle) {
CloseHandle(*handle);
*handle = NULL;
}
#endif
(void) 0;
}
static bool process_handle_is_running(process_handle handle, int *status) {
#ifdef _WIN32
DWORD s;
if (GetExitCodeProcess(handle, &s) && s != STILL_ACTIVE) {
if (status != NULL)
*status = s;
return false;
}
#else
int s;
if (waitpid(handle, &s, WNOHANG) != 0) {
if (status != NULL)
*status = WEXITSTATUS(s);
return false;
}
#endif
return true;
}
static bool process_handle_signal(process_handle handle, signal_e sig) {
#if _WIN32
switch(sig) {
case SIGNAL_TERM: return GenerateConsoleCtrlEvent(CTRL_BREAK_EVENT, GetProcessId(handle));
case SIGNAL_KILL: return TerminateProcess(handle, -1);
case SIGNAL_INTERRUPT: return DebugBreakProcess(handle);
}
#else
switch (sig) {
case SIGNAL_TERM: return kill(-handle, SIGTERM) == 0; break;
case SIGNAL_KILL: return kill(-handle, SIGKILL) == 0; break;
case SIGNAL_INTERRUPT: return kill(-handle, SIGINT) == 0; break;
}
#endif
return false;
}
static int kill_list_worker(void *ud) {
process_kill_list_t *list = (process_kill_list_t *) ud;
process_kill_t *current_task;
uint32_t delay;
while (true) {
SDL_LockMutex(list->mutex);
// wait until we have work to do
while (!list->head && !list->stop)
SDL_CondWait(list->has_work, list->mutex); // LOCK MUTEX
if (list->stop) break;
while ((current_task = list->head)) {
if ((SDL_GetTicks() - current_task->start_time) < PROCESS_TERM_DELAY)
break;
kill_list_pop(list);
if (process_handle_is_running(current_task->handle, NULL)) {
if (current_task->tries < PROCESS_TERM_TRIES)
process_handle_signal(current_task->handle, SIGNAL_TERM);
else if (current_task->tries == PROCESS_TERM_TRIES)
process_handle_signal(current_task->handle, SIGNAL_KILL);
else
goto free_task;
// add the task back into the queue
current_task->tries++;
current_task->start_time = SDL_GetTicks();
kill_list_push(list, current_task);
} else {
free_task:
SDL_CondSignal(list->work_done);
process_handle_close(&current_task->handle);
free(current_task);
}
}
delay = list->head ? (list->head->start_time + PROCESS_TERM_DELAY) - SDL_GetTicks() : 0;
SDL_UnlockMutex(list->mutex);
SDL_Delay(delay);
}
SDL_UnlockMutex(list->mutex);
return 0;
}
static bool poll_process(process_t* proc, int timeout) {
uint32_t ticks;
if (!proc->running)
return false;
if (timeout == WAIT_DEADLINE)
timeout = proc->deadline;
ticks = SDL_GetTicks();
do {
int status;
if (!process_handle_is_running(PROCESS_GET_HANDLE(proc), &status)) {
proc->running = false;
proc->returncode = status;
break;
}
if (timeout)
SDL_Delay(timeout >= 5 ? 5 : 0);
} while (timeout == WAIT_INFINITE || (int)SDL_GetTicks() - ticks < timeout);
return proc->running;
}
static bool signal_process(process_t* proc, signal_e sig) {
if (process_handle_signal(PROCESS_GET_HANDLE(proc), sig))
poll_process(proc, WAIT_NONE);
return true;
}
static int process_start(lua_State* L) {
int retval = 1;
size_t env_len = 0, key_len, val_len;
const char *cmd[256] = { NULL }, *env_names[256] = { NULL }, *env_values[256] = { NULL }, *cwd = NULL;
bool detach = false, literal = false;
int deadline = 10, new_fds[3] = { STDIN_FD, STDOUT_FD, STDERR_FD };
size_t arg_len = lua_gettop(L), cmd_len;
if (lua_type(L, 1) == LUA_TTABLE) {
#if LUA_VERSION_NUM > 501
lua_len(L, 1);
#else
lua_pushinteger(L, (int)lua_objlen(L, 1));
#endif
cmd_len = luaL_checknumber(L, -1); lua_pop(L, 1);
for (size_t i = 1; i <= cmd_len; ++i) {
lua_pushinteger(L, i);
lua_rawget(L, 1);
cmd[i-1] = luaL_checkstring(L, -1);
}
} else {
literal = true;
cmd[0] = luaL_checkstring(L, 1);
cmd_len = 1;
}
// this should never trip
// but if it does we are in deep trouble
assert(cmd[0]);
if (arg_len > 1) {
lua_getfield(L, 2, "env");
if (!lua_isnil(L, -1)) {
lua_pushnil(L);
while (lua_next(L, -2) != 0) {
const char* key = luaL_checklstring(L, -2, &key_len);
const char* val = luaL_checklstring(L, -1, &val_len);
env_names[env_len] = malloc(key_len+1);
strcpy((char*)env_names[env_len], key);
env_values[env_len] = malloc(val_len+1);
strcpy((char*)env_values[env_len], val);
lua_pop(L, 1);
++env_len;
}
} else
lua_pop(L, 1);
lua_getfield(L, 2, "detach"); detach = lua_toboolean(L, -1);
lua_getfield(L, 2, "timeout"); deadline = luaL_optnumber(L, -1, deadline);
lua_getfield(L, 2, "cwd"); cwd = luaL_optstring(L, -1, NULL);
lua_getfield(L, 2, "stdin"); new_fds[STDIN_FD] = luaL_optnumber(L, -1, STDIN_FD);
lua_getfield(L, 2, "stdout"); new_fds[STDOUT_FD] = luaL_optnumber(L, -1, STDOUT_FD);
lua_getfield(L, 2, "stderr"); new_fds[STDERR_FD] = luaL_optnumber(L, -1, STDERR_FD);
for (int stream = STDIN_FD; stream <= STDERR_FD; ++stream) {
if (new_fds[stream] > STDERR_FD || new_fds[stream] < REDIRECT_PARENT) {
lua_pushfstring(L, "redirect to handles, FILE* and paths are not supported");
retval = -1;
goto cleanup;
}
}
}
process_t* self = lua_newuserdata(L, sizeof(process_t));
memset(self, 0, sizeof(process_t));
luaL_setmetatable(L, API_TYPE_PROCESS);
self->deadline = deadline;
self->detached = detach;
#if _WIN32
for (int i = 0; i < 3; ++i) {
switch (new_fds[i]) {
case REDIRECT_PARENT:
switch (i) {
case STDIN_FD: self->child_pipes[i][0] = GetStdHandle(STD_INPUT_HANDLE); break;
case STDOUT_FD: self->child_pipes[i][1] = GetStdHandle(STD_OUTPUT_HANDLE); break;
case STDERR_FD: self->child_pipes[i][1] = GetStdHandle(STD_ERROR_HANDLE); break;
}
self->child_pipes[i][i == STDIN_FD ? 1 : 0] = INVALID_HANDLE_VALUE;
break;
case REDIRECT_DISCARD:
self->child_pipes[i][0] = INVALID_HANDLE_VALUE;
self->child_pipes[i][1] = INVALID_HANDLE_VALUE;
break;
default: {
if (new_fds[i] == i) {
char pipeNameBuffer[MAX_PATH];
sprintf(pipeNameBuffer, "\\\\.\\Pipe\\RemoteExeAnon.%08lx.%08lx", GetCurrentProcessId(), InterlockedIncrement(&PipeSerialNumber));
self->child_pipes[i][0] = CreateNamedPipeA(pipeNameBuffer, PIPE_ACCESS_INBOUND | FILE_FLAG_OVERLAPPED,
PIPE_TYPE_BYTE | PIPE_WAIT, 1, READ_BUF_SIZE, READ_BUF_SIZE, 0, NULL);
if (self->child_pipes[i][0] == INVALID_HANDLE_VALUE) {
lua_pushfstring(L, "Error creating read pipe: %d.", GetLastError());
retval = -1;
goto cleanup;
}
self->child_pipes[i][1] = CreateFileA(pipeNameBuffer, GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (self->child_pipes[i][1] == INVALID_HANDLE_VALUE) {
CloseHandle(self->child_pipes[i][0]);
lua_pushfstring(L, "Error creating write pipe: %d.", GetLastError());
retval = -1;
goto cleanup;
}
if (!SetHandleInformation(self->child_pipes[i][i == STDIN_FD ? 1 : 0], HANDLE_FLAG_INHERIT, 0) ||
!SetHandleInformation(self->child_pipes[i][i == STDIN_FD ? 0 : 1], HANDLE_FLAG_INHERIT, 1)) {
lua_pushfstring(L, "Error inheriting pipes: %d.", GetLastError());
retval = -1;
goto cleanup;
}
}
} break;
}
}
for (int i = 0; i < 3; ++i) {
if (new_fds[i] != i) {
self->child_pipes[i][0] = self->child_pipes[new_fds[i]][0];
self->child_pipes[i][1] = self->child_pipes[new_fds[i]][1];
}
}
STARTUPINFO siStartInfo;
memset(&self->process_information, 0, sizeof(self->process_information));
memset(&siStartInfo, 0, sizeof(siStartInfo));
siStartInfo.cb = sizeof(siStartInfo);
siStartInfo.dwFlags |= STARTF_USESTDHANDLES;
siStartInfo.hStdInput = self->child_pipes[STDIN_FD][0];
siStartInfo.hStdOutput = self->child_pipes[STDOUT_FD][1];
siStartInfo.hStdError = self->child_pipes[STDERR_FD][1];
char commandLine[32767] = { 0 }, environmentBlock[32767], wideEnvironmentBlock[32767*2];
int offset = 0;
if (!literal) {
for (size_t i = 0; i < cmd_len; ++i) {
size_t len = strlen(cmd[i]);
if (offset + len + 2 >= sizeof(commandLine)) break;
if (i > 0)
commandLine[offset++] = ' ';
commandLine[offset++] = '"';
int backslashCount = 0; // Yes, this is necessary.
for (size_t j = 0; j < len && offset + 2 + backslashCount < sizeof(commandLine); ++j) {
if (cmd[i][j] == '\\')
++backslashCount;
else if (cmd[i][j] == '"') {
for (size_t k = 0; k < backslashCount; ++k)
commandLine[offset++] = '\\';
commandLine[offset++] = '\\';
backslashCount = 0;
} else
backslashCount = 0;
commandLine[offset++] = cmd[i][j];
}
if (offset + 1 + backslashCount >= sizeof(commandLine)) break;
for (size_t k = 0; k < backslashCount; ++k)
commandLine[offset++] = '\\';
commandLine[offset++] = '"';
}
commandLine[offset] = 0;
} else {
strncpy(commandLine, cmd[0], sizeof(commandLine));
}
offset = 0;
for (size_t i = 0; i < env_len; ++i) {
if (offset + strlen(env_values[i]) + strlen(env_names[i]) + 1 >= sizeof(environmentBlock))
break;
offset += snprintf(&environmentBlock[offset], sizeof(environmentBlock) - offset, "%s=%s", env_names[i], env_values[i]);
environmentBlock[offset++] = 0;
}
environmentBlock[offset++] = 0;
if (env_len > 0)
MultiByteToWideChar(CP_UTF8, MB_PRECOMPOSED, environmentBlock, offset, (LPWSTR)wideEnvironmentBlock, sizeof(wideEnvironmentBlock));
if (!CreateProcess(NULL, commandLine, NULL, NULL, true, (detach ? DETACHED_PROCESS : CREATE_NO_WINDOW) | CREATE_UNICODE_ENVIRONMENT, env_len > 0 ? wideEnvironmentBlock : NULL, cwd, &siStartInfo, &self->process_information)) {
lua_pushfstring(L, "Error creating a process: %d.", GetLastError());
retval = -1;
goto cleanup;
}
self->pid = (long)self->process_information.dwProcessId;
if (detach)
CloseHandle(self->process_information.hProcess);
CloseHandle(self->process_information.hThread);
#else
int control_pipe[2] = { 0 };
for (int i = 0; i < 3; ++i) { // Make only the parents fd's non-blocking. Children should block.
if (pipe(self->child_pipes[i]) || fcntl(self->child_pipes[i][i == STDIN_FD ? 1 : 0], F_SETFL, O_NONBLOCK) == -1) {
lua_pushfstring(L, "Error creating pipes: %s", strerror(errno));
retval = -1;
goto cleanup;
}
}
// create a pipe to get the exit code of exec()
if (pipe(control_pipe) == -1) {
lua_pushfstring(L, "Error creating control pipe: %s", strerror(errno));
retval = -1;
goto cleanup;
}
if (fcntl(control_pipe[1], F_SETFD, FD_CLOEXEC) == -1) {
lua_pushfstring(L, "Error setting FD_CLOEXEC: %s", strerror(errno));
retval = -1;
goto cleanup;
}
self->pid = (long)fork();
if (self->pid < 0) {
lua_pushfstring(L, "Error running fork: %s.", strerror(errno));
retval = -1;
goto cleanup;
} else if (!self->pid) {
// child process
if (!detach)
setpgid(0,0);
for (int stream = 0; stream < 3; ++stream) {
if (new_fds[stream] == REDIRECT_DISCARD) { // Close the stream if we don't want it.
close(self->child_pipes[stream][stream == STDIN_FD ? 0 : 1]);
close(stream);
} else if (new_fds[stream] != REDIRECT_PARENT) // Use the parent handles if we redirect to parent.
dup2(self->child_pipes[new_fds[stream]][new_fds[stream] == STDIN_FD ? 0 : 1], stream);
close(self->child_pipes[stream][stream == STDIN_FD ? 1 : 0]);
}
size_t set;
for (set = 0; set < env_len && setenv(env_names[set], env_values[set], 1) == 0; ++set);
if (set == env_len && (!detach || setsid() != -1) && (!cwd || chdir(cwd) != -1))
execvp(cmd[0], (char** const)cmd);
write(control_pipe[1], &errno, sizeof(errno));
_exit(-1);
}
// close our write side so we can read from child
close(control_pipe[1]);
control_pipe[1] = 0;
// wait for child process to respond
int sz, process_rc;
while ((sz = read(control_pipe[0], &process_rc, sizeof(int))) == -1) {
if (errno == EPIPE) break;
if (errno != EINTR) {
lua_pushfstring(L, "Error getting child process status: %s", strerror(errno));
retval = -1;
goto cleanup;
}
}
if (sz) {
// read something from pipe; exec failed
int status;
waitpid(self->pid, &status, 0);
lua_pushfstring(L, "Error creating child process: %s", strerror(process_rc));
retval = -1;
goto cleanup;
}
#endif
cleanup:
#ifndef _WIN32
if (control_pipe[0]) close(control_pipe[0]);
if (control_pipe[1]) close(control_pipe[1]);
#endif
for (size_t i = 0; i < env_len; ++i) {
free((char*)env_names[i]);
free((char*)env_values[i]);
}
for (int stream = 0; stream < 3; ++stream) {
process_stream_handle* pipe = &self->child_pipes[stream][stream == STDIN_FD ? 0 : 1];
if (*pipe) {
close_fd(pipe);
}
}
if (retval == -1)
return lua_error(L);
self->running = true;
return retval;
}
static int g_read(lua_State* L, int stream, unsigned long read_size) {
process_t* self = (process_t*) luaL_checkudata(L, 1, API_TYPE_PROCESS);
long length = 0;
if (stream != STDOUT_FD && stream != STDERR_FD)
return luaL_error(L, "redirect to handles, FILE* and paths are not supported");
#if _WIN32
int writable_stream_idx = stream - 1;
if (self->reading[writable_stream_idx] || !ReadFile(self->child_pipes[stream][0], self->buffer[writable_stream_idx], READ_BUF_SIZE, NULL, &self->overlapped[writable_stream_idx])) {
if (self->reading[writable_stream_idx] || GetLastError() == ERROR_IO_PENDING) {
self->reading[writable_stream_idx] = true;
DWORD bytesTransferred = 0;
if (GetOverlappedResult(self->child_pipes[stream][0], &self->overlapped[writable_stream_idx], &bytesTransferred, false)) {
self->reading[writable_stream_idx] = false;
length = bytesTransferred;
memset(&self->overlapped[writable_stream_idx], 0, sizeof(self->overlapped[writable_stream_idx]));
}
} else {
signal_process(self, SIGNAL_TERM);
return 0;
}
} else {
length = self->overlapped[writable_stream_idx].InternalHigh;
memset(&self->overlapped[writable_stream_idx], 0, sizeof(self->overlapped[writable_stream_idx]));
}
lua_pushlstring(L, self->buffer[writable_stream_idx], length);
#else
luaL_Buffer b;
luaL_buffinit(L, &b);
uint8_t* buffer = (uint8_t*)luaL_prepbuffsize(&b, READ_BUF_SIZE);
length = read(self->child_pipes[stream][0], buffer, read_size > READ_BUF_SIZE ? READ_BUF_SIZE : read_size);
if (length == 0 && !poll_process(self, WAIT_NONE))
return 0;
else if (length < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))
length = 0;
if (length < 0) {
signal_process(self, SIGNAL_TERM);
return 0;
}
luaL_addsize(&b, length);
luaL_pushresult(&b);
#endif
return 1;
}
static int f_write(lua_State* L) {
process_t* self = (process_t*) luaL_checkudata(L, 1, API_TYPE_PROCESS);
size_t data_size = 0;
const char* data = luaL_checklstring(L, 2, &data_size);
long length;
#if _WIN32
DWORD dwWritten;
if (!WriteFile(self->child_pipes[STDIN_FD][1], data, data_size, &dwWritten, NULL)) {
int lastError = GetLastError();
signal_process(self, SIGNAL_TERM);
return luaL_error(L, "error writing to process: %d", lastError);
}
length = dwWritten;
#else
length = write(self->child_pipes[STDIN_FD][1], data, data_size);
if (length < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))
length = 0;
else if (length < 0) {
const char* lastError = strerror(errno);
signal_process(self, SIGNAL_TERM);
return luaL_error(L, "error writing to process: %s", lastError);
}
#endif
lua_pushinteger(L, length);
return 1;
}
static int f_close_stream(lua_State* L) {
process_t* self = (process_t*) luaL_checkudata(L, 1, API_TYPE_PROCESS);
int stream = luaL_checknumber(L, 2);
close_fd(&self->child_pipes[stream][stream == STDIN_FD ? 1 : 0]);
lua_pushboolean(L, 1);
return 1;
}
// Generic stuff below here.
static int process_strerror(lua_State* L) {
#if _WIN32
return 1;
#endif
int error_code = luaL_checknumber(L, 1);
if (error_code < 0)
lua_pushstring(L, strerror(error_code));
else
lua_pushnil(L);
return 1;
}
static int f_tostring(lua_State* L) {
lua_pushliteral(L, API_TYPE_PROCESS);
return 1;
}
static int f_pid(lua_State* L) {
process_t* self = (process_t*) luaL_checkudata(L, 1, API_TYPE_PROCESS);
lua_pushinteger(L, self->pid);
return 1;
}
static int f_returncode(lua_State *L) {
process_t* self = (process_t*) luaL_checkudata(L, 1, API_TYPE_PROCESS);
if (self->running)
return 0;
lua_pushinteger(L, self->returncode);
return 1;
}
static int f_read_stdout(lua_State* L) {
return g_read(L, STDOUT_FD, luaL_optinteger(L, 2, READ_BUF_SIZE));
}
static int f_read_stderr(lua_State* L) {
return g_read(L, STDERR_FD, luaL_optinteger(L, 2, READ_BUF_SIZE));
}
static int f_read(lua_State* L) {
return g_read(L, luaL_checknumber(L, 2), luaL_optinteger(L, 3, READ_BUF_SIZE));
}
static int f_wait(lua_State* L) {
process_t* self = (process_t*) luaL_checkudata(L, 1, API_TYPE_PROCESS);
int timeout = luaL_optnumber(L, 2, 0);
if (poll_process(self, timeout))
return 0;
lua_pushinteger(L, self->returncode);
return 1;
}
static int self_signal(lua_State* L, signal_e sig) {
process_t* self = (process_t*) luaL_checkudata(L, 1, API_TYPE_PROCESS);
signal_process(self, sig);
lua_pushboolean(L, 1);
return 1;
}
static int f_terminate(lua_State* L) { return self_signal(L, SIGNAL_TERM); }
static int f_kill(lua_State* L) { return self_signal(L, SIGNAL_KILL); }
static int f_interrupt(lua_State* L) { return self_signal(L, SIGNAL_INTERRUPT); }
static int f_gc(lua_State* L) {
process_t* self = (process_t*) luaL_checkudata(L, 1, API_TYPE_PROCESS);
if (poll_process(self, 0) && !self->detached) {
// attempt to kill the process if not detached
process_kill_t *p;
signal_process(self, SIGNAL_TERM);
p = malloc(sizeof(process_kill_t));
if (!p || !kill_list_thread) {
// if we can't allocate, we'll use the old method
poll_process(self, PROCESS_TERM_DELAY);
if (self->running) {
signal_process(self, SIGNAL_KILL);
poll_process(self, PROCESS_TERM_DELAY);
}
} else {
// send the handle to a queue for asynchronous waiting
p->handle = PROCESS_GET_HANDLE(self);
p->start_time = SDL_GetTicks();
p->tries = 1;
SDL_LockMutex(kill_list.mutex);
kill_list_push(&kill_list, p);
SDL_CondSignal(kill_list.has_work);
SDL_UnlockMutex(kill_list.mutex);
}
}
close_fd(&self->child_pipes[STDIN_FD ][1]);
close_fd(&self->child_pipes[STDOUT_FD][0]);
close_fd(&self->child_pipes[STDERR_FD][0]);
return 0;
}
static int f_running(lua_State* L) {
process_t* self = (process_t*)luaL_checkudata(L, 1, API_TYPE_PROCESS);
lua_pushboolean(L, poll_process(self, WAIT_NONE));
return 1;
}
static int process_gc(lua_State *L) {
kill_list_wait_all(&kill_list);
SDL_WaitThread(kill_list_thread, NULL);
kill_list_free(&kill_list);
return 0;
}
static const struct luaL_Reg process_metatable[] = {
{"__gc", f_gc},
{"__tostring", f_tostring},
{"pid", f_pid},
{"returncode", f_returncode},
{"read", f_read},
{"read_stdout", f_read_stdout},
{"read_stderr", f_read_stderr},
{"write", f_write},
{"close_stream", f_close_stream},
{"wait", f_wait},
{"terminate", f_terminate},
{"kill", f_kill},
{"interrupt", f_interrupt},
{"running", f_running},
{NULL, NULL}
};
static const struct luaL_Reg lib[] = {
{ "start", process_start },
{ "strerror", process_strerror },
{ NULL, NULL }
};
int luaopen_process(lua_State *L) {
if (kill_list_init(&kill_list))
kill_list_thread = SDL_CreateThread(kill_list_worker, "process_kill", &kill_list);
// create the process metatable
luaL_newmetatable(L, API_TYPE_PROCESS);
luaL_setfuncs(L, process_metatable, 0);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
// create the process library
luaL_newlib(L, lib);
lua_newtable(L);
lua_pushcfunction(L, process_gc);
lua_setfield(L, -2, "__gc");
lua_setmetatable(L, -2);
API_CONSTANT_DEFINE(L, -1, "WAIT_INFINITE", WAIT_INFINITE);
API_CONSTANT_DEFINE(L, -1, "WAIT_DEADLINE", WAIT_DEADLINE);
API_CONSTANT_DEFINE(L, -1, "STREAM_STDIN", STDIN_FD);
API_CONSTANT_DEFINE(L, -1, "STREAM_STDOUT", STDOUT_FD);
API_CONSTANT_DEFINE(L, -1, "STREAM_STDERR", STDERR_FD);
API_CONSTANT_DEFINE(L, -1, "REDIRECT_DEFAULT", REDIRECT_DEFAULT);
API_CONSTANT_DEFINE(L, -1, "REDIRECT_STDOUT", STDOUT_FD);
API_CONSTANT_DEFINE(L, -1, "REDIRECT_STDERR", STDERR_FD);
API_CONSTANT_DEFINE(L, -1, "REDIRECT_PARENT", REDIRECT_PARENT); // Redirects to parent's STDOUT/STDERR
API_CONSTANT_DEFINE(L, -1, "REDIRECT_DISCARD", REDIRECT_DISCARD); // Closes the filehandle, discarding it.
return 1;
}
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