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148 lines
3.0 KiB
C
148 lines
3.0 KiB
C
#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <lua.h>
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#include <lualib.h>
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#include <lauxlib.h>
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extern char **environ;
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/* helper functions */
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static void *safe_alloc(lua_State *L, size_t n)
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{
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return lua_newuserdata(L, n);
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}
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static int windows_error(lua_State *L)
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{
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lua_pushnil(L);
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lua_pushstring(L, strerror(errno));
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return 2;
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}
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/* seconds -- */
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static int osex_sleep(lua_State *L)
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{
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lua_Number seconds = luaL_checknumber(L, 1);
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Sleep(1e3 * seconds);
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return 0;
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}
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#define PROCESS_HANDLE "process"
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struct process {
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HANDLE pid;
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int status;
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};
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static void get_redirect(lua_State *L, HANDLE *handle, const char *stream)
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{
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lua_getfield(L, 2, stream);
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if (!lua_isnil(L, -1)) {
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FILE **pf = luaL_checkudata(L, LUA_FILEHANDLE);
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*handle = _get_osfhandle(_filen(*pf));
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}
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lua_pop(L, 1);
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}
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/* filename [options] -- true/nil,error */
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static int osex_spawn(lua_State *L)
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{
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size_t len;
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const char *filename;
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char *cmdline;
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char *environment;
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struct process *p;
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STARTUPINFO si;
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PROCESS_INFORMATION pi;
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filename = luaL_checklstring(L, 1, &len);
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cmdline = safe_alloc(len + 3);
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sprintf(cmdline, "\"%s\"", filename);
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environment = 0;
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si.cb = sizeof si;
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si.dwFlags = STARTF_USESTDHANDLES;
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si.hStdInput = GetStandardHandle(STD_INPUT_HANDLE);
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si.hStdOutput = GetStandardHandle(STD_OUTPUT_HANDLE);
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si.hStdError = GetStandardHandle(STD_ERROR_HANDLE);
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if (lua_type(L, 2) == LUA_TTABLE) {
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lua_getfield(L, 2, "args");
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if (!lua_isnil(L, -1)) {
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luaL_checktype(L, -1, LUA_TTABLE);
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cmdline = insert_alli(L, -1);
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}
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lua_pop(L, 1);
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lua_getfield(L, 2, "env");
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if (!lua_isnil(L, -1)) {
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luaL_checktype(L, -1, LUA_TTABLE);
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environment = insert_all(L, -1);
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}
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lua_pop(L, 1);
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get_redirect(L, "stdin", &si.hStdInput );
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get_redirect(L, "stdout", &si.hStdOutput);
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get_redirect(L, "stderr", &si.hStdError );
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}
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p = lua_newuserdata(L, sizeof *p);
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luaL_getmetatable(L, PROCESS_HANDLE);
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lua_setmetatable(L, -2);
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p->status = -1;
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if (!CreateProcess(0, cmdline, 0, 0, 0, 0, environment, 0, &si, &pi))
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return windows_error(L);
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p->pid = pi.hProcess;
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return 1;
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}
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static int process_wait(lua_State *L)
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{
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struct process *p = luaL_checkudata(L, 1, PROCESS_HANDLE);
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if (p->status != -1) {
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int status;
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waitpid(p->pid, &status, 0);
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p->status = WEXITSTATUS(status);
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}
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lua_pushnumber(L, p->status);
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return 1;
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}
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static const luaL_reg process_lib[] = {
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{"wait", process_wait},
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{0,0}
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};
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static int osex_newpipe(lua_State *L)
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{
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int fd[2];
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FILE **pf;
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if (0 != pipe(fd))
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return posix_error(L);
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luaL_getmetatable(L, LUA_FILEHANDLE);
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pf = lua_newuserdata(L, sizeof *pf);
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lua_pushvalue(L, -2);
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lua_setmetatable(L, -2);
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*pf = fdopen(fd[0], "r");
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pf = lua_newuserdata(L, sizeof *pf);
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lua_pushvalue(L, -2);
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lua_setmetatable(L, -2);
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*pf = fdopen(fd[1], "w");
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return 2;
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}
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static const luaL_reg osex_lib[] = {
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{"sleep", osex_sleep},
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{"spawn", osex_spawn},
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{"newpipe", osex_newpipe},
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{0,0}
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};
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int luaopen_osex(lua_State *L)
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{
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luaL_newmetatable(L, PROCESS_HANDLE);
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luaL_register(L, 0, process_lib);
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luaL_register(L, "os", osex_lib);
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return 1;
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}
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