reactos/lib/msvcrt/process/_system.c

   1 /* $Id: _system.c,v 1.5 2002/11/24 18:42:23 robd Exp $
   2  *
   3  * COPYRIGHT:   See COPYING in the top level directory
   4  * PROJECT:     ReactOS system libraries
   5  * FILE:        lib/msvcrt/process/system.c
   6  * PURPOSE:     Excutes a shell command
   7  * PROGRAMER:   Boudewijn Dekker
   8  * UPDATE HISTORY:
   9  *              04/03/99: Created
  10  */
  11 #include <windows.h>
  12 #include <msvcrt/stdlib.h>
  13 #include <msvcrt/string.h>
  14 #include <msvcrt/process.h>
  15 #include <msvcrt/errno.h>
  16
  17 int system(const char *command)
  18 {
  19   char *szCmdLine = NULL;
  20   char *szComSpec = NULL;
  21
  22   PROCESS_INFORMATION ProcessInformation;
  23   STARTUPINFO StartupInfo;
  24   char *s;
  25   BOOL result;
  26
  27   int nStatus;
  28
  29   szComSpec = getenv("COMSPEC");
  30
  31 // system should return 0 if command is null and the shell is found
  32
  33   if (command == NULL) {
  34       if (szComSpec == NULL)
  35         return 0;
  36       else
  37       {
  38         free(szComSpec);
  39         return -1;
  40       }
  41     }
  42
  43 // should return 127 or 0 ( MS ) if the shell is not found
  44 // __set_errno(ENOENT);
  45
  46   if (szComSpec == NULL)
  47   {
  48     szComSpec = strdup("cmd.exe");
  49     if (szComSpec == NULL)
  50     {
  51        __set_errno(ENOMEM);
  52        return -1;
  53     }
  54   }
  55
  56   s = max(strchr(szComSpec, '\\'), strchr(szComSpec, '/'));
  57   if (s == NULL)
  58     s = szComSpec;
  59   else
  60     s++;
  61
  62   szCmdLine = malloc(strlen(s) + 4 + strlen(command) + 1);
  63   if (szCmdLine == NULL)
  64   {
  65      free (szComSpec);
  66      __set_errno(ENOMEM);
  67      return -1;
  68   }
  69
  70   strcpy(szCmdLine, s);
  71   s = strrchr(szCmdLine, '.');
  72   if (s)
  73     *s = 0;
  74   strcat(szCmdLine, " /C ");
  75   strcat(szCmdLine, command);
  76
  77 //command file has invalid format ENOEXEC
  78
  79   memset (&StartupInfo, 0, sizeof(STARTUPINFO));
  80   StartupInfo.cb = sizeof(STARTUPINFO);
  81   StartupInfo.lpReserved= NULL;
  82   StartupInfo.dwFlags = 0;
  83   StartupInfo.wShowWindow = SW_SHOWDEFAULT;
  84   StartupInfo.lpReserved2 = NULL;
  85   StartupInfo.cbReserved2 = 0;
  86
  87 // According to ansi standards the new process should ignore  SIGINT and SIGQUIT
  88 // In order to disable ctr-c the process is created with CREATE_NEW_PROCESS_GROUP,
  89 // thus SetConsoleCtrlHandler(NULL,TRUE) is made on behalf of the new process.
  90
  91
  92 //SIGCHILD should be blocked aswell
  93
  94   result = CreateProcessA(szComSpec,
  95                           szCmdLine,
  96                           NULL,
  97                           NULL,
  98                           TRUE,
  99                           0,
 100                           NULL,
 101                           NULL,
 102                           &StartupInfo,
 103                           &ProcessInformation);
 104   free(szCmdLine);
 105   free(szComSpec);
 106
 107   if (result == FALSE)
 108   {
 109      __set_errno(ENOEXEC);
 110      return -1;
 111   }
 112
 113   CloseHandle(ProcessInformation.hThread);
 114
 115 // system should wait untill the calling process is finished
 116   _cwait(&nStatus,(int)ProcessInformation.hProcess,0);
 117   CloseHandle(ProcessInformation.hProcess);
 118
 119   return nStatus;
 120 }