Usermode/Applications/init_src/main.c

   1 /*
   2  * Acess2 System Init Task
   3  */
   4 #include <acess/sys.h>
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include "common.h"
   9 #include <ctype.h>
  10
  11 // === CONSTANTS ===
  12 #define DEFAULT_SHELL   "/Acess/SBin/login"
  13 #define INITTAB_FILE    "/Acess/Conf/inittab"
  14
  15 #define ARRAY_SIZE(x)   ((sizeof(x))/(sizeof((x)[0])))
  16
  17 // === PROTOTYPES ===
  18  int    ProcessInittab(const char *Path);
  19 char    *ReadQuotedString(FILE *FP);
  20 char    **ReadCommand(FILE *FP);
  21 void    FreeCommand(char **Command);
  22
  23 tInitProgram    *AllocateProgram(char **Command, enum eProgType Type, size_t ExtraSpace);
  24 void    RespawnProgam(tInitProgram *Program);
  25
  26  int    AddKTerminal(int TerminalSpec, char **Command);
  27  int    AddSerialTerminal(const char *DevPathSegment, const char *ModeStr, char **Command);
  28  int    AddDaemon(char *StdoutPath, char *StderrPath, char **Command);
  29
  30  int    SpawnCommand(int c_stdin, int c_stdout, int c_stderr, char **ArgV);
  31  int    SpawnKTerm(tInitProgram *Program);
  32  int    SpawnSTerm(tInitProgram *Program);
  33  int    SpawnDaemon(tInitProgram *Program);
  34
  35 // === GLOBALS ===
  36 const char      *gsInittabPath = INITTAB_FILE;
  37 tInitProgram    *gpInitPrograms;
  38
  39 // === CODE ===
  40 /**
  41  * \fn int main(int argc, char *argv[])
  42  * \brief Entrypoint
  43  */
  44 int main(int argc, char *argv[])
  45 {
  46         // Parse commandline args
  47         // TODO: cmdline
  48
  49         // TODO: Behave differently if not invoked as first process?
  50
  51         // Begin init process
  52         if( ProcessInittab(gsInittabPath) != 0 )
  53         {
  54                 // No inittab file found, default to:
  55                 _SysDebug("inittab '%s' is invalid, falling back to one VT", gsInittabPath);
  56
  57                 #if 1
  58                 for( ;; )
  59                 {
  60                         int pid = SpawnCommand(0, 1, 1, (char *[]){DEFAULT_SHELL, NULL});
  61                         // TODO: Detect errors
  62                         _SysWaitTID(pid, NULL);
  63                 }
  64                 #else
  65                 return 41;
  66                 #endif
  67         }
  68
  69         // TODO: Implement message watching
  70         for(;;)
  71         {
  72                  int    pid, status;
  73                 pid = _SysWaitTID(-1, &status);
  74                 _SysDebug("PID %i died, looking for respawn entry", pid);
  75         }
  76
  77         return 42;
  78 }
  79
  80 char *ReadQuotedString(FILE *FP)
  81 {
  82         char    ch;
  83
  84         while( isblank(ch = fgetc(FP)) )
  85                 ;
  86
  87         if( ch == '\n' ) {
  88                 return NULL;
  89         }
  90
  91         char    *retstr = NULL;
  92          int    mode = 0;
  93          int    pos = 0, space = 0;
  94         for( ; !feof(FP); ch = fgetc(FP) )
  95         {
  96                  int    skip;
  97                 skip = 1;
  98                 if( mode & 4 ) {
  99                         // Add escaped/special character
 100                         skip = 0;
 101                         mode &= 3;
 102                 }
 103                 else if( mode == 0 )
 104                 {
 105                         if( isspace(ch) ) {
 106                                 fseek(FP, -1, SEEK_CUR);
 107                                 break;
 108                         }
 109                         else if( ch == '\\' )
 110                                 mode |= 4;
 111                         else if( ch == '"' )
 112                                 mode = 1;
 113                         else if( ch == '\'')
 114                                 mode = 2;
 115                         else {
 116                                 // Add character
 117                                 skip = 0;
 118                         }
 119                 }
 120                 // Double-quoted string
 121                 else if( mode == 1 )
 122                 {
 123                         if( ch == '"' )
 124                                 mode = 0;
 125                         else if( ch == '\\' )
 126                                 mode |= 4;
 127                         else {
 128                                 // Add character
 129                                 skip = 0;
 130                         }
 131                 }
 132                 // Single-quoted string
 133                 else if( mode == 2 )
 134                 {
 135                         if( ch == '\'' )
 136                                 mode = 0;
 137                         else if( ch == '\\' )
 138                                 mode |= 4;
 139                         else {
 140                                 // Add character
 141                                 skip = 0;
 142                         }
 143                 }
 144
 145                 if( !skip )
 146                 {
 147                         if( pos == space ) {
 148                                 space += 32;
 149                                 void *tmp = realloc(retstr, space+1);
 150                                 if( !tmp ) {
 151                                         _SysDebug("ReadQuotedString - realloc(%i) failure", space+1);
 152                                         free(retstr);
 153                                         return NULL;
 154                                 }
 155                                 retstr = tmp;
 156                         }
 157                         retstr[pos++] = ch;
 158                 }
 159         }
 160         if( retstr )
 161                 retstr[pos] = '\0';
 162         return retstr;
 163 }
 164
 165 char **ReadCommand(FILE *FP)
 166 {
 167         const int       space = 8;
 168          int    pos = 0;
 169         char    **ret = malloc(space*sizeof(char*));
 170         char    *arg;
 171         do {
 172                 arg = ReadQuotedString(FP);
 173                 if(arg == NULL)
 174                         break;
 175                 if( pos == space - 1 ) {
 176                         _SysDebug("Too many arguments %i", pos);
 177                         ret[pos] = NULL;
 178                         FreeCommand(ret);
 179                         return NULL;
 180                 }
 181                 ret[pos++] = arg;
 182         } while(arg != NULL);
 183
 184         if( pos == 0 )
 185         {
 186                 free(ret);
 187                 return NULL;
 188         }
 189         ret[pos] = NULL;
 190         return ret;
 191 }
 192
 193 void FreeCommand(char **Command)
 194 {
 195         int pos = 0;
 196         while( Command[pos] )
 197         {
 198                 free(Command[pos]);
 199                 pos ++;
 200         }
 201         free(Command);
 202 }
 203
 204 int ProcessInittab(const char *Path)
 205 {
 206          int    line_num = 0;
 207         FILE    *fp = fopen(Path, "r");
 208
 209         if( !fp )
 210                 return 1;
 211
 212         while(!feof(fp))
 213         {
 214                 char cmdbuf[64+1];
 215
 216                 line_num ++;
 217
 218                  int    rv;
 219                 if( (rv = fscanf(fp, "%64s%*[ \t]", cmdbuf)) != 1 ) {
 220                         _SysDebug("fscanf rv %i != exp 1", rv);
 221                         break;
 222                 }
 223
 224                 // Clear comments
 225                 if( cmdbuf[0] == '#' ) {
 226                         while( !feof(fp) && fgetc(fp) != '\n' )
 227                                 ;
 228                         continue ;
 229                 }
 230                 if( cmdbuf[0] == '\0' ) {
 231                         char    ch = fgetc(fp);
 232                         if( ch != '\n' && ch != -1 ) {
 233                                 fclose(fp);
 234                                 _SysDebug("Unexpected char 0x%x, expecting EOL", ch);
 235                                 return 2;       // Unexpected character?
 236                         }
 237                         continue ;
 238                 }
 239
 240                 // Check commands
 241                 if( strcmp(cmdbuf, "ktty") == 0 ) {
 242                         // ktty <ID> <command...>
 243                         // - Spins off a console on the specified kernel TTY
 244                          int    id = 0;
 245                         if( fscanf(fp, "%d ", &id) != 1 ) {
 246                                 _SysDebug("init[ktty] - TTY ID read failed");
 247                                 goto lineError;
 248                         }
 249                         char    **command = ReadCommand(fp);
 250                         if( !command ) {
 251                                 _SysDebug("init[ktty] - Command read failure");
 252                                 goto lineError;
 253                         }
 254                         AddKTerminal(id, command);
 255                         free(command);
 256                 }
 257                 else if(strcmp(cmdbuf, "stty") == 0 ) {
 258                         // stty <devpath> [78][NOE][012][bB]<baud> <command...>
 259                         char    path_seg[32+1];
 260                         char    modespec[4+6+1];
 261                         if( fscanf(fp, "%32s %6s ", path_seg, modespec) != 2 ) {
 262                                 goto lineError;
 263                         }
 264                         char **command = ReadCommand(fp);
 265                         if( !command )
 266                                 goto lineError;
 267                         AddSerialTerminal(path_seg, modespec, command);
 268                 }
 269                 else if(strcmp(cmdbuf, "daemon") == 0 ) {
 270                         // daemon <stdout> <stderr> <command...>
 271                         // - Runs a daemon (respawning) that logs to the specified files
 272                         // - Will append a header whenever the daemon starts
 273                         char    *stdout_path = ReadQuotedString(fp);
 274                         char    *stderr_path = ReadQuotedString(fp);
 275                         char    **command = ReadCommand(fp);
 276
 277                         AddDaemon(stdout_path, stderr_path, command);
 278                 }
 279                 else if(strcmp(cmdbuf, "exec") == 0 ) {
 280                         // exec <command...>
 281                         // - Runs a command and waits for it to complete before continuing
 282                         // - NOTE: No other commands will respawn while this is running
 283                         char **command = ReadCommand(fp);
 284                         if(!command)
 285                                 goto lineError;
 286
 287                         int handles[] = {0, 1, 2};
 288                         int pid = _SysSpawn(command[0], (const char **)command, NULL, 3, handles, NULL);
 289                         int retstatus;
 290                         _SysWaitTID(pid, &retstatus);
 291                         _SysDebug("Command '%s' returned %i", command[0], retstatus);
 292
 293                         FreeCommand(command);
 294                 }
 295                 else {
 296                         // Unknown command.
 297                         _SysDebug("Unknown command '%s'", cmdbuf);
 298                         goto lineError;
 299                 }
 300                 fscanf(fp, " ");
 301                 continue;
 302         lineError:
 303                 _SysDebug("label lineError: goto'd - line %i, cmdbuf='%s'", line_num, cmdbuf);
 304                 while( !feof(fp) && fgetc(fp) != '\n' )
 305                         ;
 306                 continue ;
 307         }
 308
 309         fclose(fp);
 310
 311         if( gpInitPrograms == NULL )
 312                 return 2;
 313
 314         return 0;
 315 }
 316
 317 tInitProgram *AllocateProgram(char **Command, enum eProgType Type, size_t ExtraSpace)
 318 {
 319         tInitProgram    *ret;
 320
 321         ret = malloc( sizeof(tInitProgram) - sizeof(union uProgTypes) + ExtraSpace );
 322         ret->Next = NULL;
 323         ret->CurrentPID = 0;
 324         ret->Type = Type;
 325         ret->Command = Command;
 326
 327         // Append
 328         ret->Next = gpInitPrograms;
 329         gpInitPrograms = ret;
 330
 331         return ret;
 332 }
 333
 334 void RespawnProgam(tInitProgram *Program)
 335 {
 336          int    rv = 0;
 337         switch(Program->Type)
 338         {
 339         case PT_KTERM:  rv = SpawnKTerm(Program);       break;
 340         case PT_STERM:  rv = SpawnSTerm(Program);       break;
 341         case PT_DAEMON: rv = SpawnDaemon(Program);      break;
 342         default:
 343                 _SysDebug("BUGCHECK - Program Type %i unknown", Program->Type);
 344                 break;
 345         }
 346         if( !rv ) {
 347                 _SysDebug("Respawn failure!");
 348                 // TODO: Remove from list?
 349         }
 350 }
 351
 352 int AddKTerminal(int TerminalID, char **Command)
 353 {
 354         // TODO: Smarter validation
 355         if( TerminalID < 0 || TerminalID > 7 )
 356                 return -1;
 357
 358         tInitProgram    *ent = AllocateProgram(Command, PT_KTERM, sizeof(struct sKTerm));
 359         ent->TypeInfo.KTerm.ID = TerminalID;
 360
 361         RespawnProgam(ent);
 362         return 0;
 363 }
 364
 365 int AddSerialTerminal(const char *DevPathSegment, const char *ModeStr, char **Command)
 366 {
 367         char    dbit, parity, sbit;
 368          int    baud;
 369
 370         // Parse mode string
 371         if( sscanf(ModeStr, "%1[78]%1[NOE]%1[012]%*1[bB]%d", &dbit, &parity, &sbit, &baud) != 5 ) {
 372                 // Oops?
 373                 return -1;
 374         }
 375
 376         // Validate baud rate / build mode word
 377         // TODO: Does baud rate need validation?
 378         uint32_t        modeword = 0;
 379         modeword |= (dbit == '7' ? 1 : 0) << 0;
 380         modeword |= (parity == 'O' ? 1 : (parity == 'E' ? 2 : 0)) << 1;
 381         modeword |= (sbit - '0') << 3;
 382
 383         // Create info
 384         const char DEVPREFIX[] = "/Devices/";
 385         int pathlen = sizeof(DEVPREFIX) + strlen(DevPathSegment);
 386         tInitProgram    *ent = AllocateProgram(Command, PT_STERM, sizeof(struct sSTerm)+pathlen);
 387         ent->TypeInfo.STerm.FormatBits = modeword;
 388         ent->TypeInfo.STerm.BaudRate = baud;
 389         strcpy(ent->TypeInfo.STerm.Path, DEVPREFIX);
 390         strcat(ent->TypeInfo.STerm.Path, DevPathSegment);
 391
 392         RespawnProgam(ent);
 393         return 0;
 394 }
 395
 396 int AddDaemon(char *StdoutPath, char *StderrPath, char **Command)
 397 {
 398         tInitProgram    *ent = AllocateProgram(Command, PT_DAEMON, sizeof(struct sDaemon));
 399         ent->TypeInfo.Daemon.StdoutPath = StdoutPath;
 400         ent->TypeInfo.Daemon.StderrPath = StderrPath;
 401
 402         RespawnProgam(ent);
 403         return 0;
 404 }
 405
 406 int SpawnCommand(int c_stdin, int c_stdout, int c_stderr, char **ArgV)
 407 {
 408          int    handles[] = {c_stdin, c_stdout, c_stderr};
 409
 410         int rv = _SysSpawn(ArgV[0], (const char **)ArgV, NULL, 3, handles, NULL);
 411
 412         _SysClose(c_stdin);
 413         if( c_stdout != c_stdin )
 414                 _SysClose(c_stdout);
 415         if( c_stderr != c_stdin && c_stderr != c_stdout )
 416                 _SysClose(c_stderr);
 417
 418         return rv;
 419 }
 420
 421 int SpawnKTerm(tInitProgram *Program)
 422 {
 423         const char fmt[] = "/Devices/VTerm/%i";
 424         char    path[sizeof(fmt)];
 425
 426         snprintf(path, sizeof(path), fmt, Program->TypeInfo.KTerm.ID);
 427
 428          int    in = _SysOpen(path, OPENFLAG_READ);
 429          int    out = _SysOpen(path, OPENFLAG_WRITE);
 430
 431         return SpawnCommand(in, out, out, Program->Command);
 432 }
 433
 434 int SpawnSTerm(tInitProgram *Program)
 435 {
 436          int    in = _SysOpen(Program->TypeInfo.STerm.Path, OPENFLAG_READ);
 437          int    out = _SysOpen(Program->TypeInfo.STerm.Path, OPENFLAG_WRITE);
 438
 439         #if 0
 440         if( _SysIOCtl(in, 0, NULL) != DRV_TYPE_SERIAL )
 441         {
 442                 // Oops?
 443                 return -2;
 444         }
 445         _SysIOCtl(in, SERIAL_IOCTL_GETSETBAUD, &Program->TypeInfo.STerm.BaudRate);
 446         _SysIOCtl(in, SERIAL_IOCTL_GETSETFORMAT, &Program->TypeInfo.STerm.FormatBits);
 447         #endif
 448
 449         return SpawnCommand(in, out, out, Program->Command);
 450 }
 451
 452 int SpawnDaemon(tInitProgram *Program)
 453 {
 454          int    in = _SysOpen("/Devices/null", OPENFLAG_READ);
 455          int    out = _SysOpen(Program->TypeInfo.Daemon.StdoutPath, OPENFLAG_WRITE);
 456          int    err = _SysOpen(Program->TypeInfo.Daemon.StderrPath, OPENFLAG_WRITE);
 457
 458         if( in == -1 || out == -1 || err == -1 ) {
 459                 _SysClose(in);
 460                 _SysClose(out);
 461                 _SysClose(err);
 462                 return -2;
 463         }
 464
 465         return SpawnCommand(in, out, err, Program->Command);
 466 }
 467