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 0
  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         retstr[pos] = '\0';
 161         return retstr;
 162 }
 163
 164 char **ReadCommand(FILE *FP)
 165 {
 166         const int       space = 8;
 167          int    pos = 0;
 168         char    **ret = malloc(space*sizeof(char*));
 169         char    *arg;
 170         do {
 171                 arg = ReadQuotedString(FP);
 172                 if(arg == NULL)
 173                         break;
 174                 if( pos == space - 1 ) {
 175                         _SysDebug("Too many arguments %i", pos);
 176                         ret[pos] = NULL;
 177                         FreeCommand(ret);
 178                         return NULL;
 179                 }
 180                 ret[pos++] = arg;
 181         } while(arg != NULL);
 182         ret[pos] = NULL;
 183         return ret;
 184 }
 185
 186 void FreeCommand(char **Command)
 187 {
 188         int pos = 0;
 189         while( Command[pos] )
 190         {
 191                 free(Command[pos]);
 192                 pos ++;
 193         }
 194         free(Command);
 195 }
 196
 197 int ProcessInittab(const char *Path)
 198 {
 199         FILE    *fp = fopen(Path, "r");
 200
 201         if( !fp )
 202                 return 1;
 203
 204         while(!feof(fp))
 205         {
 206                 char cmdbuf[64+1];
 207
 208                  int    rv;
 209                 if( (rv = fscanf(fp, "%64s%*[ \t]", &cmdbuf)) != 1 ) {
 210                         _SysDebug("fscanf rv %i != exp 1", rv);
 211                         break;
 212                 }
 213
 214                 // Clear comments
 215                 if( cmdbuf[0] == '#' ) {
 216                         while( !feof(fp) && fgetc(fp) != '\n' )
 217                                 ;
 218                         continue ;
 219                 }
 220                 if( cmdbuf[0] == '\0' ) {
 221                         char    ch = fgetc(fp);
 222                         if( ch != '\n' && ch != -1 ) {
 223                                 fclose(fp);
 224                                 _SysDebug("Unexpected char 0x%x, expecting EOL", ch);
 225                                 return 2;       // Unexpected character?
 226                         }
 227                         continue ;
 228                 }
 229
 230                 // Check commands
 231                 if( strcmp(cmdbuf, "ktty") == 0 ) {
 232                         // ktty <ID> <command...>
 233                         // - Spins off a console on the specified kernel TTY
 234                          int    id = 0;
 235                         if( fscanf(fp, "%d ", &id) != 1 ) {
 236                                 _SysDebug("init[ktty] - TTY ID read failed");
 237                                 goto lineError;
 238                         }
 239                         char    **command = ReadCommand(fp);
 240                         if( !command ) {
 241                                 _SysDebug("init[ktty] - Command read failure");
 242                                 goto lineError;
 243                         }
 244                         AddKTerminal(id, command);
 245                         free(command);
 246                 }
 247                 else if(strcmp(cmdbuf, "stty") == 0 ) {
 248                         // stty <devpath> [78][NOE][012][bB]<baud> <command...>
 249                         char    path_seg[32+1];
 250                         char    modespec[4+6+1];
 251                         if( fscanf(fp, "%32s %6s ", &path_seg, &modespec) != 2 ) {
 252                                 goto lineError;
 253                         }
 254                         char **command = ReadCommand(fp);
 255                         if( !command )
 256                                 goto lineError;
 257                         AddSerialTerminal(path_seg, modespec, command);
 258                 }
 259                 else if(strcmp(cmdbuf, "daemon") == 0 ) {
 260                         // daemon <stdout> <stderr> <command...>
 261                         // - Runs a daemon (respawning) that logs to the specified files
 262                         // - Will append a header whenever the daemon starts
 263                         char    *stdout_path = ReadQuotedString(fp);
 264                         char    *stderr_path = ReadQuotedString(fp);
 265                         char    **command = ReadCommand(fp);
 266
 267                         AddDaemon(stdout_path, stderr_path, command);
 268                 }
 269                 else if(strcmp(cmdbuf, "exec") == 0 ) {
 270                         // exec <command...>
 271                         // - Runs a command and waits for it to complete before continuing
 272                         // - NOTE: No other commands will respawn while this is running
 273                         char **command = ReadCommand(fp);
 274                         if(!command)
 275                                 goto lineError;
 276
 277                         int handles[] = {0, 1, 2};
 278                         int pid = _SysSpawn(command[0], (const char **)command, NULL, 3, handles, NULL);
 279                         int retstatus;
 280                         _SysWaitTID(pid, &retstatus);
 281                         _SysDebug("Command '%s' returned %i", command[0], retstatus);
 282
 283                         FreeCommand(command);
 284                 }
 285                 else {
 286                         // Unknown command.
 287                         _SysDebug("Unknown command '%s'", cmdbuf);
 288                         goto lineError;
 289                 }
 290                 fscanf(fp, " ");
 291                 continue;
 292         lineError:
 293                 _SysDebug("label lineError: goto'd");
 294                 while( !feof(fp) && fgetc(fp) != '\n' )
 295                         ;
 296                 continue ;
 297         }
 298
 299         fclose(fp);
 300         return 0;
 301 }
 302
 303 tInitProgram *AllocateProgram(char **Command, enum eProgType Type, size_t ExtraSpace)
 304 {
 305         tInitProgram    *ret;
 306
 307         ret = malloc( sizeof(tInitProgram) - sizeof(union uProgTypes) + ExtraSpace );
 308         ret->Next = NULL;
 309         ret->CurrentPID = 0;
 310         ret->Type = Type;
 311         ret->Command = Command;
 312
 313         // Append
 314         ret->Next = gpInitPrograms;
 315         gpInitPrograms = ret;
 316
 317         return ret;
 318 }
 319
 320 void RespawnProgam(tInitProgram *Program)
 321 {
 322          int    rv = 0;
 323         switch(Program->Type)
 324         {
 325         case PT_KTERM:  rv = SpawnKTerm(Program);       break;
 326         case PT_STERM:  rv = SpawnSTerm(Program);       break;
 327         case PT_DAEMON: rv = SpawnDaemon(Program);      break;
 328         default:
 329                 _SysDebug("BUGCHECK - Program Type %i unknown", Program->Type);
 330                 break;
 331         }
 332         if( !rv ) {
 333                 _SysDebug("Respawn failure!");
 334                 // TODO: Remove from list?
 335         }
 336 }
 337
 338 int AddKTerminal(int TerminalID, char **Command)
 339 {
 340         // TODO: Smarter validation
 341         if( TerminalID < 0 || TerminalID > 7 )
 342                 return -1;
 343
 344         tInitProgram    *ent = AllocateProgram(Command, PT_KTERM, sizeof(struct sKTerm));
 345         ent->TypeInfo.KTerm.ID = TerminalID;
 346
 347         RespawnProgam(ent);
 348         return 0;
 349 }
 350
 351 int AddSerialTerminal(const char *DevPathSegment, const char *ModeStr, char **Command)
 352 {
 353         char    dbit, parity, sbit;
 354          int    baud;
 355
 356         // Parse mode string
 357         if( sscanf(ModeStr, "%1[78]%1[NOE]%1[012]%*1[bB]%d", &dbit, &parity, &sbit, &baud) != 5 ) {
 358                 // Oops?
 359                 return -1;
 360         }
 361
 362         // Validate baud rate / build mode word
 363         // TODO: Does baud rate need validation?
 364         uint32_t        modeword = 0;
 365         modeword |= (dbit == '7' ? 1 : 0) << 0;
 366         modeword |= (parity == 'O' ? 1 : (parity == 'E' ? 2 : 0)) << 1;
 367         modeword |= (sbit - '0') << 3;
 368
 369         // Create info
 370         const char DEVPREFIX[] = "/Devices/";
 371         int pathlen = sizeof(DEVPREFIX) + strlen(DevPathSegment);
 372         tInitProgram    *ent = AllocateProgram(Command, PT_STERM, sizeof(struct sSTerm)+pathlen);
 373         ent->TypeInfo.STerm.FormatBits = modeword;
 374         ent->TypeInfo.STerm.BaudRate = baud;
 375         strcpy(ent->TypeInfo.STerm.Path, DEVPREFIX);
 376         strcat(ent->TypeInfo.STerm.Path, DevPathSegment);
 377
 378         RespawnProgam(ent);
 379         return 0;
 380 }
 381
 382 int AddDaemon(char *StdoutPath, char *StderrPath, char **Command)
 383 {
 384         tInitProgram    *ent = AllocateProgram(Command, PT_DAEMON, sizeof(struct sDaemon));
 385         ent->TypeInfo.Daemon.StdoutPath = StdoutPath;
 386         ent->TypeInfo.Daemon.StderrPath = StderrPath;
 387
 388         RespawnProgam(ent);
 389         return 0;
 390 }
 391
 392 int SpawnCommand(int c_stdin, int c_stdout, int c_stderr, char **ArgV)
 393 {
 394          int    handles[] = {c_stdin, c_stdout, c_stderr};
 395
 396         int rv = _SysSpawn(ArgV[0], (const char **)ArgV, NULL, 3, handles, NULL);
 397
 398         _SysClose(c_stdin);
 399         if( c_stdout != c_stdin )
 400                 _SysClose(c_stdout);
 401         if( c_stderr != c_stdin && c_stderr != c_stdout )
 402                 _SysClose(c_stderr);
 403
 404         return rv;
 405 }
 406
 407 int SpawnKTerm(tInitProgram *Program)
 408 {
 409         const char fmt[] = "/Devices/VTerm/%i";
 410         char    path[sizeof(fmt)];
 411
 412         snprintf(path, sizeof(path), fmt, Program->TypeInfo.KTerm.ID);
 413
 414          int    in = _SysOpen(path, OPENFLAG_READ);
 415          int    out = _SysOpen(path, OPENFLAG_WRITE);
 416
 417         return SpawnCommand(in, out, out, Program->Command);
 418 }
 419
 420 int SpawnSTerm(tInitProgram *Program)
 421 {
 422          int    in = _SysOpen(Program->TypeInfo.STerm.Path, OPENFLAG_READ);
 423          int    out = _SysOpen(Program->TypeInfo.STerm.Path, OPENFLAG_WRITE);
 424
 425         #if 0
 426         if( _SysIOCtl(in, 0, NULL) != DRV_TYPE_SERIAL )
 427         {
 428                 // Oops?
 429                 return -2;
 430         }
 431         _SysIOCtl(in, SERIAL_IOCTL_GETSETBAUD, &Program->TypeInfo.STerm.BaudRate);
 432         _SysIOCtl(in, SERIAL_IOCTL_GETSETFORMAT, &Program->TypeInfo.STerm.FormatBits);
 433         #endif
 434
 435         return SpawnCommand(in, out, out, Program->Command);
 436 }
 437
 438 int SpawnDaemon(tInitProgram *Program)
 439 {
 440          int    in = _SysOpen("/Devices/null", OPENFLAG_READ);
 441          int    out = _SysOpen(Program->TypeInfo.Daemon.StdoutPath, OPENFLAG_WRITE);
 442          int    err = _SysOpen(Program->TypeInfo.Daemon.StderrPath, OPENFLAG_WRITE);
 443
 444         if( in == -1 || out == -1 || err == -1 ) {
 445                 _SysClose(in);
 446                 _SysClose(out);
 447                 _SysClose(err);
 448                 return -2;
 449         }
 450
 451         return SpawnCommand(in, out, err, Program->Command);
 452 }
 453