_system.c File Reference

#include <precomp.h>
#include <stdlib.h>
#include <string.h>
#include <process.h>

Include dependency graph for _system.c:

Go to the source code of this file.

Functions
int	system (const char *command)
int CDECL	_wsystem (const wchar_t *cmd)

Function Documentation

_wsystem()

int CDECL _wsystem

(

const wchar_t *

cmd

)

Definition at line 119 of file _system.c.

{
    FIXME("_wsystem stub\n");
    return -1;
}

system()

int system

(

const char *

command

)

Definition at line 20 of file _system.c.

{
  char *szCmdLine = NULL;
  char *szComSpec = NULL;
 
  PROCESS_INFORMATION ProcessInformation;
  STARTUPINFOA StartupInfo;
  char *s;
  BOOL result;
 
  int nStatus;
 
  szComSpec = getenv("COMSPEC");
 
// system should return 0 if command is null and the shell is found
 
  if (command == NULL) {
    if (szComSpec == NULL)
      return 0;
    else
      return 1;
  }
 
  if (szComSpec == NULL)
    return -1;
 
// should return 127 or 0 ( MS ) if the shell is not found
// _set_errno(ENOENT);
 
  if (szComSpec == NULL)
  {
    szComSpec = "cmd.exe";
  }
 
  /* split the path from shell command */
  s = max(strrchr(szComSpec, '\\'), strrchr(szComSpec, '/'));
  if (s == NULL)
    s = szComSpec;
  else
    s++;
 
  szCmdLine = malloc(strlen(s) + 4 + strlen(command) + 1);
  if (szCmdLine == NULL)
  {
     _set_errno(ENOMEM);
     return -1;
  }
 
  strcpy(szCmdLine, s);
  s = strrchr(szCmdLine, '.');
  if (s)
    *s = 0;
  strcat(szCmdLine, " /C ");
  strcat(szCmdLine, command);
 
//command file has invalid format ENOEXEC
 
  memset (&StartupInfo, 0, sizeof(StartupInfo));
  StartupInfo.cb = sizeof(StartupInfo);
  StartupInfo.lpReserved= NULL;
  StartupInfo.dwFlags = STARTF_USESHOWWINDOW;
  StartupInfo.wShowWindow = SW_SHOWDEFAULT;
  StartupInfo.lpReserved2 = NULL;
  StartupInfo.cbReserved2 = 0;
 
// According to ansi standards the new process should ignore  SIGINT and SIGQUIT
// In order to disable ctr-c the process is created with CREATE_NEW_PROCESS_GROUP,
// thus SetConsoleCtrlHandler(NULL,TRUE) is made on behalf of the new process.
 
 
//SIGCHILD should be blocked aswell
 
  result = CreateProcessA(szComSpec,
                      szCmdLine,
              NULL,
              NULL,
              TRUE,
              CREATE_NEW_PROCESS_GROUP,
              NULL,
              NULL,
              &StartupInfo,
              &ProcessInformation);
  free(szCmdLine);
 
  if (result == FALSE)
  {
    _dosmaperr(GetLastError());
     return -1;
  }
 
  CloseHandle(ProcessInformation.hThread);
 
// system should wait untill the calling process is finished
  _cwait(&nStatus,(intptr_t)ProcessInformation.hProcess,0);
  CloseHandle(ProcessInformation.hProcess);
 
  return nStatus;
}