1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
// --------------------------------------------------------------------------
//
// 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 "autogen_ServerException.h"
#include "Utils.h"
#ifdef WIN32
#include "FileStream.h"
#else
#include "SocketStream.h"
#endif
#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 its stdin and stdout (stdout and stderr on
// Win32). Returns the PID of the new process -- this
// must be waited on at some point to avoid zombies
// (except on Win32).
// Created: 12/3/04
//
// --------------------------------------------------------------------------
std::auto_ptr<IOStream> LocalProcessStream(const char *CommandLine, pid_t &rPidOut)
{
#ifndef WIN32
// Split up command
std::vector<std::string> command;
SplitString(std::string(CommandLine), ' ', command);
// 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
SECURITY_ATTRIBUTES secAttr;
secAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
secAttr.bInheritHandle = TRUE;
secAttr.lpSecurityDescriptor = NULL;
HANDLE writeInChild, readFromChild;
if(!CreatePipe(&readFromChild, &writeInChild, &secAttr, 0))
{
BOX_ERROR("Failed to CreatePipe for child process: "
GetErrorMessage(GetLastError()));
THROW_EXCEPTION(ServerException, SocketPairFailed)
}
SetHandleInformation(readFromChild, HANDLE_FLAG_INHERIT, 0);
PROCESS_INFORMATION procInfo;
STARTUPINFO startupInfo;
ZeroMemory(&procInfo, sizeof(procInfo));
ZeroMemory(&startupInfo, sizeof(startupInfo));
startupInfo.cb = sizeof(startupInfo);
startupInfo.hStdError = writeInChild;
startupInfo.hStdOutput = writeInChild;
startupInfo.hStdInput = INVALID_HANDLE_VALUE;
startupInfo.dwFlags |= STARTF_USESTDHANDLES;
CHAR* commandLineCopy = (CHAR*)malloc(strlen(CommandLine) + 1);
strcpy(commandLineCopy, CommandLine);
BOOL result = CreateProcess(NULL,
commandLineCopy, // command line
NULL, // process security attributes
NULL, // primary thread security attributes
TRUE, // handles are inherited
0, // creation flags
NULL, // use parent's environment
NULL, // use parent's current directory
&startupInfo, // STARTUPINFO pointer
&procInfo); // receives PROCESS_INFORMATION
free(commandLineCopy);
if(!result)
{
BOX_ERROR("Failed to CreateProcess: '" << CommandLine <<
"': " << GetErrorMessage(GetLastError()));
CloseHandle(writeInChild);
CloseHandle(readFromChild);
THROW_EXCEPTION(ServerException, ServerForkError)
}
CloseHandle(procInfo.hProcess);
CloseHandle(procInfo.hThread);
CloseHandle(writeInChild);
rPidOut = (int)(procInfo.dwProcessId);
std::auto_ptr<IOStream> stream(new FileStream(readFromChild));
return stream;
#endif // ! WIN32
}
|