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annotate libraries/extos/extos.c @ 134:a1507b499fa5

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Implemented ipairs metamethod for sparse JSON arrays
author jbe
date Sun Jul 27 22:42:52 2014 +0200 (2014-07-27)
parents 593413f317f4
children 34bf5f7abe0d
rev   line source
jbe/bsw@0 1 #include <lua.h>
jbe/bsw@0 2 #include <lauxlib.h>
jbe/bsw@0 3 #include <dirent.h>
jbe/bsw@0 4 #include <time.h>
jbe/bsw@0 5 #include <unistd.h>
jbe/bsw@0 6 #include <sys/types.h>
jbe/bsw@0 7 #include <sys/wait.h>
jbe/bsw@0 8 #include <signal.h>
jbe/bsw@0 9 #include <errno.h>
jbe/bsw@0 10 #include <stdio.h>
jbe/bsw@0 11 #include <string.h>
jbe/bsw@0 12 #include <fcntl.h>
jbe/bsw@0 13 #include <poll.h>
jbe/bsw@0 14 #include <stdlib.h>
jbe/bsw@0 15
jbe/bsw@0 16 #define EXTOS_MAX_ERRLEN 80
jbe/bsw@0 17 #define EXTOS_EXEC_MAX_ARGS 64
jbe/bsw@0 18
jbe/bsw@0 19 static lua_Number extos_monotonic_start_time;
jbe/bsw@0 20
jbe/bsw@0 21 static int extos_pfilter(lua_State *L) {
jbe/bsw@0 22 int i, result, exit_status, status_pipe_len;
jbe/bsw@0 23 const char *in_buf;
jbe/bsw@0 24 size_t in_len;
jbe/bsw@0 25 size_t in_pos = 0;
jbe/bsw@0 26 const char *filename;
jbe/bsw@0 27 const char *args[EXTOS_EXEC_MAX_ARGS+2];
jbe/bsw@0 28 int pipe_status[2];
jbe/bsw@0 29 int pipe_in[2];
jbe/bsw@0 30 int pipe_out[2];
jbe/bsw@0 31 int pipe_err[2];
jbe/bsw@0 32 pid_t child;
jbe/bsw@0 33 char status_buf[1];
jbe/bsw@0 34 char *out_buf = NULL;
jbe/bsw@0 35 size_t out_len = 1024;
jbe/bsw@0 36 size_t out_pos = 0;
jbe/bsw@0 37 char *err_buf = NULL;
jbe/bsw@0 38 size_t err_len = 1024;
jbe/bsw@0 39 size_t err_pos = 0;
jbe/bsw@0 40 void *old_sigpipe_action;
jbe/bsw@0 41 struct pollfd fds[3];
jbe/bsw@0 42 int in_closed = 0;
jbe/bsw@0 43 int out_closed = 0;
jbe/bsw@0 44 int err_closed = 0;
jbe/bsw@0 45 void *newptr;
jbe/bsw@0 46 char errmsg[EXTOS_MAX_ERRLEN+1];
jbe/bsw@0 47 in_buf = luaL_optlstring(L, 1, "", &in_len);
jbe/bsw@0 48 filename = luaL_checkstring(L, 2);
jbe/bsw@0 49 args[0] = filename;
jbe/bsw@0 50 for (i = 0; i < EXTOS_EXEC_MAX_ARGS; i++) {
jbe/bsw@0 51 if (lua_isnoneornil(L, 3+i)) break;
jbe/bsw@0 52 else args[i+1] = luaL_checkstring(L, 3+i);
jbe/bsw@0 53 }
jbe/bsw@0 54 if (!lua_isnoneornil(L, 3+i)) {
jbe/bsw@0 55 return luaL_error(L, "Too many arguments for pfilter call.");
jbe/bsw@0 56 }
jbe/bsw@0 57 args[i+1] = 0;
jbe/bsw@0 58 // status pipe for internal communication
jbe/bsw@0 59 if (pipe(pipe_status) < 0) {
jbe/bsw@0 60 strerror_r(errno, errmsg, EXTOS_MAX_ERRLEN+1);
jbe/bsw@0 61 goto extos_pfilter_error_A0;
jbe/bsw@0 62 }
jbe/bsw@0 63 // stdin
jbe/bsw@0 64 if (pipe(pipe_in) < 0) {
jbe/bsw@0 65 strerror_r(errno, errmsg, EXTOS_MAX_ERRLEN+1);
jbe/bsw@0 66 goto extos_pfilter_error_A1;
jbe/bsw@0 67 }
jbe/bsw@0 68 if (in_len) {
jbe/bsw@0 69 do result = fcntl(pipe_in[1], F_SETFL, O_NONBLOCK); while (result < 0 && errno == EINTR);
jbe/bsw@0 70 } else {
jbe/bsw@0 71 do result = close(pipe_in[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 72 in_closed = 1;
jbe/bsw@0 73 }
jbe/bsw@0 74 if (result < 0) {
jbe/bsw@0 75 strerror_r(errno, errmsg, EXTOS_MAX_ERRLEN+1);
jbe/bsw@0 76 goto extos_pfilter_error_A2;
jbe/bsw@0 77 }
jbe/bsw@0 78 // stdout
jbe/bsw@0 79 if (pipe(pipe_out) < 0) {
jbe/bsw@0 80 strerror_r(errno, errmsg, EXTOS_MAX_ERRLEN+1);
jbe/bsw@0 81 goto extos_pfilter_error_A2;
jbe/bsw@0 82 }
jbe/bsw@0 83 do result = fcntl(pipe_out[0], F_SETFL, O_NONBLOCK); while (result < 0 && errno == EINTR);
jbe/bsw@0 84 if (result < 0) {
jbe/bsw@0 85 strerror_r(errno, errmsg, EXTOS_MAX_ERRLEN+1);
jbe/bsw@0 86 goto extos_pfilter_error_A3;
jbe/bsw@0 87 }
jbe/bsw@0 88 // stderr
jbe/bsw@0 89 if (pipe(pipe_err) < 0) {
jbe/bsw@0 90 strerror_r(errno, errmsg, EXTOS_MAX_ERRLEN+1);
jbe/bsw@0 91 goto extos_pfilter_error_A3;
jbe/bsw@0 92 }
jbe/bsw@0 93 do result = fcntl(pipe_err[0], F_SETFL, O_NONBLOCK); while (result < 0 && errno == EINTR);
jbe/bsw@0 94 if (result < 0) {
jbe/bsw@0 95 strerror_r(errno, errmsg, EXTOS_MAX_ERRLEN+1);
jbe/bsw@0 96 goto extos_pfilter_error_A4;
jbe/bsw@0 97 }
jbe/bsw@0 98 // fork
jbe/bsw@0 99 child = fork();
jbe/bsw@0 100 if (child < 0) {
jbe/bsw@0 101 strerror_r(errno, errmsg, EXTOS_MAX_ERRLEN+1);
jbe/bsw@0 102 goto extos_pfilter_error_A4;
jbe/bsw@0 103 }
jbe/bsw@0 104 // skip error handling
jbe/bsw@0 105 goto extos_pfilter_success_A;
jbe/bsw@0 106 // error handling
jbe/bsw@0 107 extos_pfilter_error_A4:
jbe/bsw@0 108 do result = close(pipe_err[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 109 do result = close(pipe_err[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 110 extos_pfilter_error_A3:
jbe/bsw@0 111 do result = close(pipe_out[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 112 do result = close(pipe_out[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 113 extos_pfilter_error_A2:
jbe/bsw@0 114 do result = close(pipe_in[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 115 do result = close(pipe_in[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 116 extos_pfilter_error_A1:
jbe/bsw@0 117 do result = close(pipe_status[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 118 do result = close(pipe_status[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 119 extos_pfilter_error_A0:
jbe/bsw@0 120 return luaL_error(L, "Unexpected error in pfilter: %s", errmsg);
jbe/bsw@0 121 // end of error handling
jbe/bsw@0 122 extos_pfilter_success_A:
jbe/bsw@0 123 if (child) { // parent
jbe/bsw@0 124 old_sigpipe_action = signal(SIGPIPE, SIG_IGN);
jbe/bsw@0 125 do result = close(pipe_status[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 126 if (result < 0) goto extos_pfilter_error_B;
jbe/bsw@0 127 do result = close(pipe_in[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 128 if (result < 0) goto extos_pfilter_error_B;
jbe/bsw@0 129 do result = close(pipe_out[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 130 if (result < 0) goto extos_pfilter_error_B;
jbe/bsw@0 131 do result = close(pipe_err[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 132 if (result < 0) goto extos_pfilter_error_B;
jbe/bsw@0 133 out_buf = malloc(out_len * sizeof(char));
jbe/bsw@0 134 if (!out_buf) goto extos_pfilter_error_B;
jbe/bsw@0 135 err_buf = malloc(err_len * sizeof(char));
jbe/bsw@0 136 if (!err_buf) goto extos_pfilter_error_B;
jbe/bsw@0 137 while (!in_closed || !out_closed || !err_closed) {
jbe/bsw@0 138 i = 0;
jbe/bsw@0 139 if (!in_closed) {
jbe/bsw@0 140 fds[i].fd = pipe_in[1];
jbe/bsw@0 141 fds[i].events = POLLOUT;
jbe/bsw@0 142 i++;
jbe/bsw@0 143 }
jbe/bsw@0 144 if (!out_closed) {
jbe/bsw@0 145 fds[i].fd = pipe_out[0];
jbe/bsw@0 146 fds[i].events = POLLIN;
jbe/bsw@0 147 i++;
jbe/bsw@0 148 }
jbe/bsw@0 149 if (!err_closed) {
jbe/bsw@0 150 fds[i].fd = pipe_err[0];
jbe/bsw@0 151 fds[i].events = POLLIN;
jbe/bsw@0 152 i++;
jbe/bsw@0 153 }
jbe/bsw@0 154 do result = poll(fds, i, -1); while (result < 0 && errno == EINTR);
jbe/bsw@0 155 if (result < 0) goto extos_pfilter_error_B;
jbe/bsw@0 156 if (!in_closed) {
jbe/bsw@0 157 do result = write(pipe_in[1], in_buf+in_pos, in_len-in_pos); while (result < 0 && errno == EINTR);
jbe/bsw@0 158 if (result < 0) {
jbe/bsw@0 159 if (errno == EPIPE) {
jbe/bsw@0 160 do result = close(pipe_in[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 161 in_closed = 1;
jbe/bsw@0 162 } else if (errno != EAGAIN) {
jbe/bsw@0 163 goto extos_pfilter_error_B;
jbe/bsw@0 164 }
jbe/bsw@0 165 } else {
jbe/bsw@0 166 in_pos += result;
jbe/bsw@0 167 if (in_pos == in_len) {
jbe/bsw@0 168 do result = close(pipe_in[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 169 in_closed = 1;
jbe/bsw@0 170 }
jbe/bsw@0 171 }
jbe/bsw@0 172 }
jbe/bsw@0 173 if (!out_closed) {
jbe/bsw@0 174 do result = read(pipe_out[0], out_buf+out_pos, out_len-out_pos); while (result < 0 && errno == EINTR);
jbe/bsw@0 175 if (result < 0) {
jbe/bsw@0 176 if (errno != EAGAIN) goto extos_pfilter_error_B;
jbe/bsw@0 177 } else if (result == 0) {
jbe/bsw@0 178 do result = close(pipe_out[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 179 out_closed = 1;
jbe/bsw@0 180 } else {
jbe/bsw@0 181 out_pos += result;
jbe/bsw@0 182 if (out_pos == out_len) {
jbe/bsw@0 183 out_len *= 2;
jbe/bsw@0 184 newptr = realloc(out_buf, out_len * sizeof(char));
jbe/bsw@0 185 if (!newptr) goto extos_pfilter_error_B;
jbe/bsw@0 186 out_buf = newptr;
jbe/bsw@0 187 }
jbe/bsw@0 188 }
jbe/bsw@0 189 }
jbe/bsw@0 190 if (!err_closed) {
jbe/bsw@0 191 do result = read(pipe_err[0], err_buf+err_pos, err_len-err_pos); while (result < 0 && errno == EINTR);
jbe/bsw@0 192 if (result < 0) {
jbe/bsw@0 193 if (errno != EAGAIN) goto extos_pfilter_error_B;
jbe/bsw@0 194 } else if (result == 0) {
jbe/bsw@0 195 do result = close(pipe_err[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 196 err_closed = 1;
jbe/bsw@0 197 } else {
jbe/bsw@0 198 err_pos += result;
jbe/bsw@0 199 if (err_pos == err_len) {
jbe/bsw@0 200 err_len *= 2;
jbe/bsw@0 201 newptr = realloc(err_buf, err_len * sizeof(char));
jbe/bsw@0 202 if (!newptr) goto extos_pfilter_error_B;
jbe/bsw@0 203 err_buf = newptr;
jbe/bsw@0 204 }
jbe/bsw@0 205 }
jbe/bsw@0 206 }
jbe/bsw@0 207 }
jbe/bsw@0 208 lua_pushlstring(L, out_buf, out_pos);
jbe/bsw@0 209 free(out_buf);
jbe/bsw@0 210 out_buf = NULL;
jbe/bsw@0 211 lua_pushlstring(L, err_buf, err_pos);
jbe/bsw@0 212 free(err_buf);
jbe/bsw@0 213 err_buf = NULL;
jbe/bsw@0 214 do result = waitpid(child, &exit_status, 0); while (result < 0 && errno == EINTR);
jbe/bsw@0 215 child = 0;
jbe/bsw@0 216 if (result < 0) goto extos_pfilter_error_B;
jbe/bsw@0 217 do status_pipe_len = read(pipe_status[0], status_buf, 1); while (status_pipe_len < 0 && errno == EINTR);
jbe/bsw@0 218 if (status_pipe_len < 0) goto extos_pfilter_error_B;
jbe/bsw@0 219 do result = close(pipe_status[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 220 signal(SIGPIPE, old_sigpipe_action);
jbe/bsw@0 221 if (status_pipe_len == 0) {
jbe/bsw@0 222 if (WIFEXITED(exit_status)) lua_pushinteger(L, WEXITSTATUS(exit_status));
jbe/bsw@0 223 else lua_pushinteger(L, -WTERMSIG(exit_status));
jbe/bsw@0 224 return 3;
jbe/bsw@0 225 } else if (status_buf[0] == 0) {
jbe/bsw@0 226 return luaL_error(L, "Error in pfilter while reopening standard file descriptors in child process.");
jbe/bsw@0 227 } else {
jbe/bsw@0 228 strerror_r(status_buf[0], errmsg, EXTOS_MAX_ERRLEN+1);
jbe/bsw@0 229 lua_pushnil(L);
jbe/bsw@0 230 lua_pushfstring(L, "Could not execute \"%s\": %s", filename, errmsg);
jbe/bsw@0 231 return 2;
jbe/bsw@0 232 }
jbe/bsw@0 233 extos_pfilter_error_B:
jbe/bsw@0 234 signal(SIGPIPE, old_sigpipe_action);
jbe/bsw@0 235 strerror_r(errno, errmsg, EXTOS_MAX_ERRLEN+1);
jbe/bsw@0 236 if (out_buf) free(out_buf);
jbe/bsw@0 237 if (err_buf) free(err_buf);
jbe/bsw@0 238 if (!in_closed) {
jbe/bsw@0 239 do result = close(pipe_in[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 240 }
jbe/bsw@0 241 if (!out_closed) {
jbe/bsw@0 242 do result = close(pipe_out[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 243 }
jbe/bsw@0 244 if (!err_closed) {
jbe/bsw@0 245 do result = close(pipe_err[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 246 }
jbe/bsw@0 247 if (child) do result = waitpid(child, &exit_status, 0); while (result < 0 && errno == EINTR);
jbe/bsw@0 248 return luaL_error(L, "Unexpected error in pfilter: %s", errmsg);
jbe/bsw@0 249 } else { // child
jbe/bsw@0 250 do result = close(pipe_status[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 251 do result = close(pipe_in[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 252 do result = close(pipe_out[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 253 do result = close(0); while (result < 0 && errno == EINTR);
jbe/bsw@0 254 do result = close(1); while (result < 0 && errno == EINTR);
jbe/bsw@0 255 do result = close(2); while (result < 0 && errno == EINTR);
jbe/bsw@0 256 do result = dup(pipe_in[0]); while (result < 0 && errno == EINTR);
jbe/bsw@0 257 if (result != 0) goto extos_pfilter_error_fd_remapping;
jbe/bsw@0 258 do result = dup(pipe_out[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 259 if (result != 1) goto extos_pfilter_error_fd_remapping;
jbe/bsw@0 260 do result = dup(pipe_err[1]); while (result < 0 && errno == EINTR);
jbe/bsw@0 261 if (result != 2) goto extos_pfilter_error_fd_remapping;
jbe/bsw@0 262 execvp(filename, args);
jbe/bsw@0 263 status_buf[0] = errno;
jbe/bsw@0 264 do result = write(pipe_status[1], status_buf, 1); while (result < 0 && errno == EINTR);
jbe/bsw@0 265 _exit(0);
jbe/bsw@0 266 extos_pfilter_error_fd_remapping:
jbe/bsw@0 267 status_buf[0] = 0;
jbe/bsw@0 268 do result = write(pipe_status[1], status_buf, 1); while (result < 0 && errno == EINTR);
jbe/bsw@0 269 _exit(0);
jbe/bsw@0 270 }
jbe/bsw@0 271 }
jbe/bsw@0 272
jbe/bsw@0 273 static int extos_listdir(lua_State *L) {
jbe/bsw@0 274 DIR *dir;
jbe/bsw@0 275 int i = 1;
jbe/bsw@0 276 struct dirent entry_buffer;
jbe/bsw@0 277 struct dirent *entry;
jbe/bsw@0 278 dir = opendir(luaL_checkstring(L, 1));
jbe/bsw@0 279 if (!dir) {
jbe/bsw@0 280 lua_pushnil(L);
jbe/bsw@0 281 lua_pushliteral(L, "Could not list directory.");
jbe/bsw@0 282 return 2;
jbe/bsw@0 283 }
jbe/bsw@0 284 lua_settop(L, 0);
jbe/bsw@0 285 lua_newtable(L); // 1
jbe/bsw@0 286 while (1) {
jbe/bsw@0 287 readdir_r(dir, &entry_buffer, &entry);
jbe/bsw@0 288 if (!entry) break;
jbe/bsw@0 289 // Linux doesn't have d_namlen
jbe/bsw@0 290 //lua_pushlstring(L, entry->d_name, entry->d_namlen);
jbe/bsw@0 291 lua_pushstring(L, entry->d_name);
jbe/bsw@0 292 lua_rawseti(L, 1, i++);
jbe/bsw@0 293 }
jbe/bsw@0 294 closedir(dir);
jbe/bsw@0 295 return 1;
jbe/bsw@0 296 }
jbe/bsw@0 297
jbe/bsw@0 298 static int extos_crypt(lua_State *L) {
jbe/bsw@0 299 char *key;
jbe/bsw@0 300 char *salt;
jbe/bsw@0 301 char *result;
jbe/bsw@0 302 key = luaL_checkstring(L, 1);
jbe/bsw@0 303 salt = luaL_checkstring(L, 2);
jbe/bsw@0 304 result = crypt(key, salt); // TODO: Call not thread safe
jbe/bsw@0 305 if (result) lua_pushstring(L, result);
jbe/bsw@0 306 else lua_pushnil(L);
jbe/bsw@0 307 return 1;
jbe/bsw@0 308 }
jbe/bsw@0 309
jbe/bsw@0 310 static int extos_hires_time(lua_State *L) {
jbe/bsw@0 311 struct timespec tp;
jbe/bsw@0 312 if (clock_gettime(CLOCK_REALTIME, &tp)) {
jbe/bsw@0 313 return luaL_error(L, "Could not access CLOCK_REALTIME.");
jbe/bsw@0 314 }
jbe/bsw@0 315 lua_pushnumber(L, tp.tv_sec + 0.000000001 * tp.tv_nsec);
jbe/bsw@0 316 return 1;
jbe/bsw@0 317 }
jbe/bsw@0 318
jbe/bsw@0 319 // returns time in seconds since loading the library
jbe/bsw@0 320 static int extos_monotonic_hires_time(lua_State *L) {
jbe/bsw@0 321 struct timespec tp;
jbe/bsw@0 322 if (clock_gettime(CLOCK_MONOTONIC, &tp)) {
jbe/bsw@0 323 return luaL_error(L, "Could not access CLOCK_MONOTONIC.");
jbe/bsw@0 324 }
jbe/bsw@0 325 lua_pushnumber(L,
jbe/bsw@0 326 tp.tv_sec + 0.000000001 * tp.tv_nsec - extos_monotonic_start_time
jbe/bsw@0 327 );
jbe/bsw@0 328 return 1;
jbe/bsw@0 329 }
jbe/bsw@0 330
jbe@64 331 static const struct luaL_Reg extos_module_functions[] = {
jbe@64 332 {"pfilter", extos_pfilter},
jbe@64 333 {"listdir", extos_listdir},
jbe@64 334 {"crypt", extos_crypt},
jbe@64 335 {"hires_time", extos_hires_time},
jbe@64 336 {"monotonic_hires_time", extos_monotonic_hires_time},
jbe@64 337 {NULL, NULL}
jbe@64 338 };
jbe@64 339
jbe/bsw@0 340 int luaopen_extos(lua_State *L) {
jbe/bsw@0 341 {
jbe/bsw@0 342 struct timespec tp;
jbe/bsw@0 343 if (clock_gettime(CLOCK_MONOTONIC, &tp)) {
jbe/bsw@0 344 return luaL_error(L, "Could not access monotonic hires time.");
jbe/bsw@0 345 }
jbe/bsw@0 346 extos_monotonic_start_time = tp.tv_sec + 0.000000001 * tp.tv_nsec;
jbe/bsw@0 347 }
jbe@64 348 #if LUA_VERSION_NUM >= 502
jbe@64 349 lua_newtable(L);
jbe@64 350 luaL_setfuncs(L, extos_module_functions, 0);
jbe@64 351 #else
jbe@70 352 luaL_register(L, lua_tostring(L, 1), extos_module_functions);
jbe@64 353 #endif
jbe@64 354 return 1;
jbe/bsw@0 355 }

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