lib/crtdll/process/_system.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:   See COPYING in the top level directory
   4  * PROJECT:     ReactOS system libraries
   5  * FILE:        lib/crtdll/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
  16 int system(const char *command)
  17 {
  18         char szCmdLine[MAX_PATH];
  19         char *szComSpec=NULL;
  20
  21
  22         PROCESS_INFORMATION ProcessInformation;
  23         STARTUPINFO StartupInfo;
  24
  25         int nStatus;
  26
  27         szComSpec = getenv("COMSPEC");
  28
  29 // system should return 0 if command is null and the shell is found
  30
  31         if ( command == NULL ) {
  32                 if ( szComSpec == NULL )
  33                         return 0;
  34                 else
  35                         return -1;
  36         }
  37
  38
  39
  40 // should return 127 or 0 ( MS ) if the shell is not found
  41 // __set_errno(ENOENT);
  42
  43         if ( szComSpec == NULL )
  44                 szComSpec = "cmd.exe";
  45
  46
  47
  48         strcpy(szCmdLine," /C ");
  49
  50         strncat(szCmdLine,command,MAX_PATH-5);
  51
  52 //check for a too long argument E2BIG
  53
  54 //command file has invalid format ENOEXEC
  55
  56
  57         StartupInfo.cb = sizeof(STARTUPINFO);
  58         StartupInfo.lpReserved= NULL;
  59         StartupInfo.dwFlags = 0;
  60         StartupInfo.wShowWindow = SW_SHOWDEFAULT;
  61         StartupInfo.lpReserved2 = NULL;
  62         StartupInfo.cbReserved2 = 0;
  63
  64 // According to ansi standards the new process should ignore  SIGINT and SIGQUIT
  65 // In order to disable ctr-c the process is created with CREATE_NEW_PROCESS_GROUP,
  66 // thus SetConsoleCtrlHandler(NULL,TRUE) is made on behalf of the new process.
  67
  68
  69 //SIGCHILD should be blocked aswell
  70
  71         if ( CreateProcessA(szComSpec,szCmdLine,NULL,NULL,TRUE,CREATE_NEW_PROCESS_GROUP,NULL,NULL,&StartupInfo,&ProcessInformation) == FALSE) {
  72                 return -1;
  73         }
  74
  75
  76 // system should wait untill the calling process is finished
  77
  78         _cwait(&nStatus,(int)ProcessInformation.hProcess,0);
  79
  80 // free the comspec [ if the COMSPEC == NULL provision is removed
  81         // free(szComSpec);
  82
  83         return nStatus;
  84 }