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lite-xl/src/api/process.c

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#include "api.h"
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <SDL.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
typedef struct {
bool running;
int returncode, deadline;
long pid;
#if _WIN32
PROCESS_INFORMATION process_information;
HANDLE child_pipes[3][2];
OVERLAPPED overlapped[2];
bool reading[2];
char buffer[2][READ_BUF_SIZE];
#else
int child_pipes[3][2];
#endif
} process_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;
#ifdef _WIN32
static volatile long PipeSerialNumber;
static void close_fd(HANDLE handle) { CloseHandle(handle); }
#else
static void close_fd(int fd) { close(fd); }
#endif
static bool poll_process(process_t* proc, int timeout) {
if (!proc->running)
return false;
unsigned int ticks = SDL_GetTicks();
if (timeout == WAIT_DEADLINE)
timeout = proc->deadline;
do {
#ifdef _WIN32
DWORD exit_code = -1;
if (!GetExitCodeProcess( proc->process_information.hProcess, &exit_code ) || exit_code != STILL_ACTIVE) {
proc->returncode = exit_code;
proc->running = false;
break;
}
#else
int status;
pid_t wait_response = waitpid(proc->pid, &status, WNOHANG);
if (wait_response != 0) {
proc->running = false;
proc->returncode = WEXITSTATUS(status);
break;
}
#endif
if (timeout)
SDL_Delay(5);
} while (timeout == WAIT_INFINITE || SDL_GetTicks() - ticks < timeout);
if (!proc->running) {
close_fd(proc->child_pipes[STDIN_FD ][1]);
close_fd(proc->child_pipes[STDOUT_FD][0]);
close_fd(proc->child_pipes[STDERR_FD][0]);
return false;
}
return true;
}
static bool signal_process(process_t* proc, signal_e sig) {
bool terminate = false;
#if _WIN32
switch(sig) {
case SIGNAL_TERM: terminate = GenerateConsoleCtrlEvent(CTRL_BREAK_EVENT, GetProcessId(proc->process_information.hProcess)); break;
case SIGNAL_KILL: terminate = TerminateProcess(proc->process_information.hProcess, -1); break;
case SIGNAL_INTERRUPT: DebugBreakProcess(proc->process_information.hProcess); break;
}
#else
switch (sig) {
case SIGNAL_TERM: terminate = kill(proc->pid, SIGTERM) == 1; break;
case SIGNAL_KILL: terminate = kill(proc->pid, SIGKILL) == 1; break;
case SIGNAL_INTERRUPT: kill(proc->pid, SIGINT); break;
}
#endif
if (terminate)
poll_process(proc, WAIT_NONE);
return true;
}
static int process_start(lua_State* L) {
size_t env_len = 0, key_len, val_len;
const char *cmd[256], *env[256] = { NULL }, *cwd = NULL;
bool detach = false;
int deadline = 10, new_fds[3] = { STDIN_FD, STDOUT_FD, STDERR_FD };
luaL_checktype(L, 1, LUA_TTABLE);
#if LUA_VERSION_NUM > 501
lua_len(L, 1);
#else
lua_pushnumber(L, (int)lua_objlen(L, 1));
#endif
size_t cmd_len = luaL_checknumber(L, -1); lua_pop(L, 1);
size_t arg_len = lua_gettop(L);
for (size_t i = 1; i <= cmd_len; ++i) {
lua_pushnumber(L, i);
lua_rawget(L, 1);
cmd[i-1] = luaL_checkstring(L, -1);
}
cmd[cmd_len] = NULL;
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[env_len] = malloc(key_len+val_len+2);
snprintf((char*)env[env_len++], key_len+val_len+2, "%s=%s", key, val);
lua_pop(L, 1);
}
} 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)
return luaL_error(L, "redirect to handles, FILE* and paths are not supported");
}
}
env[env_len] = NULL;
process_t* self = lua_newuserdata(L, sizeof(process_t));
memset(self, 0, sizeof(process_t));
luaL_setmetatable(L, API_TYPE_PROCESS);
self->deadline = deadline;
#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)
return luaL_error(L, "Error creating read pipe: %d.", GetLastError());
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]);
return luaL_error(L, "Error creating write pipe: %d.", GetLastError());
}
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))
return luaL_error(L, "Error inheriting pipes: %d.", GetLastError());
}
} 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];
int offset = 0;
strcpy(commandLine, cmd[0]);
for (size_t i = 1; i < cmd_len; ++i) {
size_t len = strlen(cmd[i]);
if (offset + len + 1 >= sizeof(commandLine))
break;
strcat(commandLine, " ");
strcat(commandLine, cmd[i]);
}
for (size_t i = 0; i < env_len; ++i) {
size_t len = strlen(env[i]);
if (offset + len >= sizeof(environmentBlock))
break;
memcpy(&environmentBlock[offset], env[i], len);
offset += len;
environmentBlock[offset++] = 0;
}
environmentBlock[offset++] = 0;
if (!CreateProcess(NULL, commandLine, NULL, NULL, true, (detach ? DETACHED_PROCESS : CREATE_NO_WINDOW) | CREATE_UNICODE_ENVIRONMENT, env_len > 0 ? environmentBlock : NULL, cwd, &siStartInfo, &self->process_information))
return luaL_error(L, "Error creating a process: %d.", GetLastError());
self->pid = (long)self->process_information.dwProcessId;
if (detach)
CloseHandle(self->process_information.hProcess);
CloseHandle(self->process_information.hThread);
#else
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)
return luaL_error(L, "Error creating pipes: %s", strerror(errno));
}
self->pid = (long)fork();
if (self->pid < 0) {
for (int i = 0; i < 3; ++i) {
close(self->child_pipes[i][0]);
close(self->child_pipes[i][1]);
}
return luaL_error(L, "Error running fork: %s.", strerror(errno));
} else if (!self->pid) {
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]);
}
if ((!detach || setsid() != -1) && (!cwd || chdir(cwd) != -1))
execvp((const char*)cmd[0], (char* const*)cmd);
const char* msg = strerror(errno);
int result = write(STDERR_FD, msg, strlen(msg)+1);
exit(result == strlen(msg)+1 ? -1 : -2);
}
#endif
for (size_t i = 0; i < env_len; ++i)
free((char*)env[i]);
for (int stream = 0; stream < 3; ++stream)
close_fd(self->child_pipes[stream][stream == STDIN_FD ? 0 : 1]);
self->running = true;
return 1;
}
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_prepbuffer(&b);
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)) {
signal_process(self, SIGNAL_TERM);
return luaL_error(L, "error writing to process: %d", GetLastError());
}
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) {
signal_process(self, SIGNAL_TERM);
return luaL_error(L, "error writing to process: %s", strerror(errno));
}
#endif
lua_pushnumber(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_pushnumber(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_pushnumber(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_pushnumber(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) { return self_signal(L, SIGNAL_TERM); }
static int f_running(lua_State* L) {
process_t* self = (process_t*)luaL_checkudata(L, 1, API_TYPE_PROCESS);
lua_pushboolean(L, self->running);
return 1;
}
static const struct luaL_Reg lib[] = {
{"__gc", f_gc},
{"__tostring", f_tostring},
{"start", process_start},
{"strerror", process_strerror},
{"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}
};
int luaopen_process(lua_State *L) {
luaL_newmetatable(L, API_TYPE_PROCESS);
luaL_setfuncs(L, lib, 0);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
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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