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// $Id: Spawn.cpp 80826 2008-03-04 14:51:23Z wotte $
#include "ace/OS_NS_stdio.h"
#include "ace/OS_NS_fcntl.h"
#include "ace/OS_NS_pwd.h"
#include "ace/os_include/os_pwd.h"
#include "ace/OS_NS_stdlib.h"
#include "ace/OS_NS_string.h"
#include "ace/OS_NS_unistd.h"
#include "ace/OS_NS_pwd.h"
#include "ace/Process.h"
#include "ace/Log_Msg.h"
// Listing 1 code/ch10
class Manager : public ACE_Process
{
public:
Manager (const ACE_TCHAR* program_name)
{
ACE_TRACE ("Manager::Manager");
ACE_OS::strcpy (programName_, program_name);
}
int doWork (void)
{
ACE_TRACE ("Manager::doWork");
// Spawn the new process; prepare() hook is called first.
ACE_Process_Options options;
pid_t pid = this->spawn (options);
if (pid == ACE_INVALID_PID)
ACE_ERROR_RETURN((LM_ERROR, ACE_TEXT ("%p\n"),
ACE_TEXT ("spawn")), -1);
// Wait forever for my child to exit.
if (this->wait () == -1)
ACE_ERROR_RETURN ((LM_ERROR, ACE_TEXT ("%p\n"),
ACE_TEXT ("wait")), -1);
// Dump whatever happened.
this->dumpRun ();
return 0;
}
// Listing 1
private:
// Listing 3 code/ch10
int dumpRun (void)
{
ACE_TRACE ("Manager::dumpRun");
if (ACE_OS::lseek (this->outputfd_, 0, SEEK_SET) == -1)
ACE_ERROR_RETURN ((LM_ERROR, ACE_TEXT ("%p\n"),
ACE_TEXT ("lseek")), -1);
char buf[1024];
ssize_t length = 0;
// Read the contents of the error stream written
// by the child and print it out.
while ((length = ACE_OS::read (this->outputfd_,
buf, sizeof(buf)-1)) > 0)
{
buf[length] = 0;
ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("%C\n"), buf));
}
ACE_OS::close (this->outputfd_);
return 0;
}
// Listing 3
// Listing 2 code/ch10
// prepare() is inherited from ACE_Process.
int prepare (ACE_Process_Options &options)
{
ACE_TRACE ("Manager::prepare");
options.command_line (ACE_TEXT ("%s 1"), this->programName_);
if (this->setStdHandles (options) == -1 ||
this->setEnvVariable (options) == -1)
return -1;
#if !defined (ACE_WIN32) && !defined (ACE_LACKS_PWD_FUNCTIONS)
return this->setUserID (options);
#else
return 0;
#endif
}
int setStdHandles (ACE_Process_Options &options)
{
ACE_TRACE ("Manager::setStdHandles");
ACE_OS::unlink ("output.dat");
this->outputfd_ =
ACE_OS::open ("output.dat", O_RDWR | O_CREAT);
return options.set_handles
(ACE_STDIN, ACE_STDOUT, this->outputfd_);
}
int setEnvVariable (ACE_Process_Options &options)
{
ACE_TRACE ("Manager::setEnvVariables");
return options.setenv
(ACE_TEXT ("PRIVATE_VAR=/that/seems/to/be/it"));
}
// Listing 2
#if !defined (ACE_LACKS_PWD_FUNCTIONS)
// Listing 10 code/ch10
int setUserID (ACE_Process_Options &options)
{
ACE_TRACE ("Manager::setUserID");
passwd* pw = ACE_OS::getpwnam ("nobody");
if (pw == 0)
return -1;
options.seteuid (pw->pw_uid);
return 0;
}
// Listing 10
#endif /* !ACE_LACKS_PWD_FUNCTIONS */
private:
ACE_HANDLE outputfd_;
ACE_TCHAR programName_[256];
};
// Listing 4 code/ch10
class Slave
{
public:
Slave ()
{
ACE_TRACE ("Slave::Slave");
}
int doWork (void)
{
ACE_TRACE ("Slave::doWork");
ACE_DEBUG ((LM_INFO,
ACE_TEXT ("(%P) started at %T, parent is %d\n"),
ACE_OS::getppid ()));
this->showWho ();
ACE_DEBUG ((LM_INFO,
ACE_TEXT ("(%P) the private environment is %s\n"),
ACE_OS::getenv ("PRIVATE_VAR")));
ACE_TCHAR str[128];
ACE_OS::sprintf (str, ACE_TEXT ("(%d) Enter your command\n"),
static_cast<int>(ACE_OS::getpid ()));
ACE_OS::write (ACE_STDOUT, str, ACE_OS::strlen (str));
this->readLine (str);
ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("(%P) Executed: %C\n"),
str));
return 0;
}
// Listing 4
void showWho (void)
{
ACE_TRACE ("Slave::showWho");
#if !defined (ACE_LACKS_PWD_FUNCTIONS)
passwd *pw = ::getpwuid (ACE_OS::geteuid ());
ACE_DEBUG ((LM_INFO,
ACE_TEXT ("(%P) Running this process as:%s\n"),
pw->pw_name));
#endif
}
ACE_TCHAR* readLine (ACE_TCHAR* str)
{
ACE_TRACE ("Slave::readLine");
int i = 0;
while (true)
{
ssize_t retval = ACE_OS::read (ACE_STDIN, &str[i], 1);
if (retval > 0)
{
if (str[i] == '\n')
{
str[++i] = 0;
return str;
}
i++;
}
else
return str;
}
}
};
// Listing 0 code/ch10
int ACE_TMAIN (int argc, ACE_TCHAR *argv[])
{
if (argc > 1) // Slave mode
{
Slave s;
return s.doWork ();
}
// Else, Master mode
Manager m (argv[0]);
return m.doWork ();
}
// Listing 0
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