lib/crtdll/process/_system.c

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS system libraries
   4  * FILE:        lib/crtdll/process/system.c
   5  * PURPOSE:     Excutes a shell command
   6  * PROGRAMER:   Boudewijn Dekker
   7  * UPDATE HISTORY:
   8  *              04/03/99: Created
   9  */
  10 #include <windows.h>
  11 #include <crtdll/stdlib.h>
  12 #include <crtdll/string.h>
  13 #include <crtdll/process.h>
  14
  15 int system(const char *command)
  16 {
  17         char szCmdLine[MAX_PATH];
  18         char *szComSpec=NULL;
  19
  20
  21         PROCESS_INFORMATION ProcessInformation;
  22         STARTUPINFO StartupInfo;
  23
  24         int nStatus;
  25
  26         szComSpec = getenv("COMSPEC");
  27
  28 // system should return 0 if command is null and the shell is found
  29
  30         if ( command == NULL ) {
  31                 if ( szComSpec == NULL )
  32                         return 0;
  33                 else
  34                         return -1;
  35         }
  36
  37
  38
  39 // should return 127 or 0 ( MS ) if the shell is not found
  40 // __set_errno(ENOENT);
  41
  42         if ( szComSpec == NULL )
  43                 szComSpec = "cmd.exe";
  44
  45
  46
  47         strcpy(szCmdLine," /C ");
  48
  49         strncat(szCmdLine,command,MAX_PATH-5);
  50
  51 //check for a too long argument E2BIG
  52
  53 //command file has invalid format ENOEXEC
  54
  55
  56         StartupInfo.cb = sizeof(STARTUPINFO);
  57         StartupInfo.lpReserved= NULL;
  58         StartupInfo.dwFlags = 0;
  59         StartupInfo.wShowWindow = SW_SHOWDEFAULT;
  60         StartupInfo.lpReserved2 = NULL;
  61         StartupInfo.cbReserved2 = 0;
  62
  63 // According to ansi standards the new process should ignore  SIGINT and SIGQUIT
  64 // In order to disable ctr-c the process is created with CREATE_NEW_PROCESS_GROUP,
  65 // thus SetConsoleCtrlHandler(NULL,TRUE) is made on behalf of the new process.
  66
  67
  68 //SIGCHILD should be blocked aswell
  69
  70         if ( CreateProcessA(szComSpec,szCmdLine,NULL,NULL,TRUE,CREATE_NEW_PROCESS_GROUP,NULL,NULL,&StartupInfo,&ProcessInformation) == FALSE) {
  71                 return -1;
  72         }
  73
  74
  75 // system should wait untill the calling process is finished
  76
  77         _cwait(&nStatus,(int)ProcessInformation.hProcess,0);
  78
  79 // free the comspec [ if the COMSPEC == NULL provision is removed
  80         // free(szComSpec);
  81
  82         return nStatus;
  83 }