reactos/lib/msvcrt/process/_system.c

   1 /* $Id$
   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
  12 #include "precomp.h"
  13 #include <msvcrt/stdlib.h>
  14 #include <msvcrt/string.h>
  15 #include <msvcrt/process.h>
  16 #include <msvcrt/errno.h>
  17 #include <msvcrt/internal/file.h>
  18
  19 /*
  20  * @implemented
  21  */
  22 int system(const char *command)
  23 {
  24   char *szCmdLine = NULL;
  25   char *szComSpec = NULL;
  26
  27   PROCESS_INFORMATION ProcessInformation;
  28   STARTUPINFOA StartupInfo;
  29   char *s;
  30   BOOL result;
  31
  32   int nStatus;
  33
  34   szComSpec = getenv("COMSPEC");
  35
  36 // system should return 0 if command is null and the shell is found
  37
  38   if (command == NULL) {
  39       if (szComSpec == NULL)
  40         return 0;
  41       else
  42         return -1;
  43     }
  44
  45 // should return 127 or 0 ( MS ) if the shell is not found
  46 // __set_errno(ENOENT);
  47
  48   if (szComSpec == NULL)
  49   {
  50     szComSpec = strdup("cmd.exe");
  51     if (szComSpec == NULL)
  52     {
  53        __set_errno(ENOMEM);
  54        return -1;
  55     }
  56   }
  57
  58   s = max(strchr(szComSpec, '\\'), strchr(szComSpec, '/'));
  59   if (s == NULL)
  60     s = szComSpec;
  61   else
  62     s++;
  63
  64   szCmdLine = malloc(strlen(s) + 4 + strlen(command) + 1);
  65   if (szCmdLine == NULL)
  66   {
  67      free (szComSpec);
  68      __set_errno(ENOMEM);
  69      return -1;
  70   }
  71
  72   strcpy(szCmdLine, s);
  73   s = strrchr(szCmdLine, '.');
  74   if (s)
  75     *s = 0;
  76   strcat(szCmdLine, " /C ");
  77   strcat(szCmdLine, command);
  78
  79 //command file has invalid format ENOEXEC
  80
  81   memset (&StartupInfo, 0, sizeof(StartupInfo));
  82   StartupInfo.cb = sizeof(StartupInfo);
  83   StartupInfo.lpReserved= NULL;
  84   StartupInfo.dwFlags = 0;
  85   StartupInfo.wShowWindow = SW_SHOWDEFAULT;
  86   StartupInfo.lpReserved2 = NULL;
  87   StartupInfo.cbReserved2 = 0;
  88
  89 // According to ansi standards the new process should ignore  SIGINT and SIGQUIT
  90 // In order to disable ctr-c the process is created with CREATE_NEW_PROCESS_GROUP,
  91 // thus SetConsoleCtrlHandler(NULL,TRUE) is made on behalf of the new process.
  92
  93
  94 //SIGCHILD should be blocked aswell
  95
  96   result = CreateProcessA(szComSpec,
  97                           szCmdLine,
  98                           NULL,
  99                           NULL,
 100                           TRUE,
 101                           0,
 102                           NULL,
 103                           NULL,
 104                           &StartupInfo,
 105                           &ProcessInformation);
 106   free(szCmdLine);
 107   free(szComSpec);
 108
 109   if (result == FALSE)
 110   {
 111         _dosmaperr(GetLastError());
 112      return -1;
 113   }
 114
 115   CloseHandle(ProcessInformation.hThread);
 116
 117 // system should wait untill the calling process is finished
 118   _cwait(&nStatus,(int)ProcessInformation.hProcess,0);
 119   CloseHandle(ProcessInformation.hProcess);
 120
 121   return nStatus;
 122 }