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// --------------------------------------------------------------------------
//
// File
// Name: LocalProcessStream.cpp
// Purpose: Opens a process, and presents stdin/stdout as a stream.
// Created: 12/3/04
//
// --------------------------------------------------------------------------
#include "Box.h"
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "LocalProcessStream.h"
#include "SocketStream.h"
#include "autogen_ServerException.h"
#include "Utils.h"
#include "MemLeakFindOn.h"
#define MAX_ARGUMENTS 64
// --------------------------------------------------------------------------
//
// Function
// Name: LocalProcessStream(const char *, pid_t &)
// Purpose: Run a new process, and return a stream giving access to it's
// stdin and stdout. Returns the PID of the new process -- this
// must be waited on at some point to avoid zombies.
// Created: 12/3/04
//
// --------------------------------------------------------------------------
std::auto_ptr<IOStream> LocalProcessStream(const char *CommandLine, pid_t &rPidOut)
{
// Split up command
std::vector<std::string> command;
SplitString(std::string(CommandLine), ' ', command);
#ifndef WIN32
// Build arguments
char *args[MAX_ARGUMENTS + 4];
{
int a = 0;
std::vector<std::string>::const_iterator i(command.begin());
while(a < MAX_ARGUMENTS && i != command.end())
{
args[a++] = (char*)(*(i++)).c_str();
}
args[a] = NULL;
}
// Create a socket pair to communicate over.
int sv[2] = {-1,-1};
if(::socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, sv) != 0)
{
THROW_EXCEPTION(ServerException, SocketPairFailed)
}
std::auto_ptr<IOStream> stream(new SocketStream(sv[0]));
// Fork
pid_t pid = 0;
switch(pid = vfork())
{
case -1: // error
::close(sv[0]);
::close(sv[1]);
THROW_EXCEPTION(ServerException, ServerForkError)
break;
case 0: // child
// Close end of the socket not being used
::close(sv[0]);
// Duplicate the file handles to stdin and stdout
if(sv[1] != 0) ::dup2(sv[1], 0);
if(sv[1] != 1) ::dup2(sv[1], 1);
// Close the now redundant socket
if(sv[1] != 0 && sv[1] != 1)
{
::close(sv[1]);
}
// Execute command!
::execv(args[0], args);
::_exit(127); // report error
break;
default:
// just continue...
break;
}
// Close the file descriptor not being used
::close(sv[1]);
// Return the stream object and PID
rPidOut = pid;
return stream;
#else // WIN32
::syslog(LOG_ERR, "vfork not implemented - LocalProcessStream.cpp");
std::auto_ptr<IOStream> stream;
return stream;
#endif // ! WIN32
}
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