reactos/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
  12 #include "precomp.h"
  13 #include <msvcrt/stdlib.h>
  14 #include <msvcrt/string.h>
  15 #include <msvcrt/process.h>
  16
  17 /*
  18  * @implemented
  19  */
  20 int system(const char *command)
  21 {
  22         char szCmdLine[MAX_PATH];
  23         char *szComSpec=NULL;
  24
  25
  26         PROCESS_INFORMATION ProcessInformation;
  27         STARTUPINFOA StartupInfo;
  28
  29         int nStatus;
  30
  31         szComSpec = getenv("COMSPEC");
  32
  33 // system should return 0 if command is null and the shell is found
  34
  35         if ( command == NULL ) {
  36                 if ( szComSpec == NULL )
  37                         return 0;
  38                 else
  39                         return -1;
  40         }
  41
  42
  43
  44 // should return 127 or 0 ( MS ) if the shell is not found
  45 // __set_errno(ENOENT);
  46
  47         if ( szComSpec == NULL )
  48                 szComSpec = "cmd.exe";
  49
  50
  51
  52         strcpy(szCmdLine," /C ");
  53
  54         strncat(szCmdLine,command,MAX_PATH-5);
  55
  56 //check for a too long argument E2BIG
  57
  58 //command file has invalid format ENOEXEC
  59
  60
  61         StartupInfo.cb = sizeof(StartupInfo);
  62         StartupInfo.lpReserved= NULL;
  63         StartupInfo.dwFlags = 0;
  64         StartupInfo.wShowWindow = SW_SHOWDEFAULT;
  65         StartupInfo.lpReserved2 = NULL;
  66         StartupInfo.cbReserved2 = 0;
  67
  68 // According to ansi standards the new process should ignore  SIGINT and SIGQUIT
  69 // In order to disable ctr-c the process is created with CREATE_NEW_PROCESS_GROUP,
  70 // thus SetConsoleCtrlHandler(NULL,TRUE) is made on behalf of the new process.
  71
  72
  73 //SIGCHILD should be blocked aswell
  74
  75         if ( CreateProcessA(szComSpec,szCmdLine,NULL,NULL,TRUE,CREATE_NEW_PROCESS_GROUP,NULL,NULL,&StartupInfo,&ProcessInformation) == FALSE) {
  76                 return -1;
  77         }
  78
  79
  80 // system should wait untill the calling process is finished
  81
  82         _cwait(&nStatus,(int)ProcessInformation.hProcess,0);
  83
  84 // free the comspec [ if the COMSPEC == NULL provision is removed
  85         // free(szComSpec);
  86
  87         return nStatus;
  88 }