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 /*
  17  * @implemented
  18  */
  19 int system(const char *command)
  20 {
  21         char szCmdLine[MAX_PATH];
  22         char *szComSpec=NULL;
  23
  24
  25         PROCESS_INFORMATION ProcessInformation;
  26         STARTUPINFOA StartupInfo;
  27
  28         int nStatus;
  29
  30         szComSpec = getenv("COMSPEC");
  31
  32 // system should return 0 if command is null and the shell is found
  33
  34         if ( command == NULL ) {
  35                 if ( szComSpec == NULL )
  36                         return 0;
  37                 else
  38                         return -1;
  39         }
  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                 szComSpec = "cmd.exe";
  48
  49
  50
  51         strcpy(szCmdLine," /C ");
  52
  53         strncat(szCmdLine,command,MAX_PATH-5);
  54
  55 //check for a too long argument E2BIG
  56
  57 //command file has invalid format ENOEXEC
  58
  59
  60         StartupInfo.cb = sizeof(StartupInfo);
  61         StartupInfo.lpReserved= NULL;
  62         StartupInfo.dwFlags = 0;
  63         StartupInfo.wShowWindow = SW_SHOWDEFAULT;
  64         StartupInfo.lpReserved2 = NULL;
  65         StartupInfo.cbReserved2 = 0;
  66
  67 // According to ansi standards the new process should ignore  SIGINT and SIGQUIT
  68 // In order to disable ctr-c the process is created with CREATE_NEW_PROCESS_GROUP,
  69 // thus SetConsoleCtrlHandler(NULL,TRUE) is made on behalf of the new process.
  70
  71
  72 //SIGCHILD should be blocked aswell
  73
  74         if ( CreateProcessA(szComSpec,szCmdLine,NULL,NULL,TRUE,CREATE_NEW_PROCESS_GROUP,NULL,NULL,&StartupInfo,&ProcessInformation) == FALSE) {
  75                 return -1;
  76         }
  77
  78
  79 // system should wait untill the calling process is finished
  80
  81         _cwait(&nStatus,(int)ProcessInformation.hProcess,0);
  82
  83 // free the comspec [ if the COMSPEC == NULL provision is removed
  84         // free(szComSpec);
  85
  86         return nStatus;
  87 }