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
|
/**
* ======================== legal notice ======================
*
* File: CommandReader.cc
* Created: 30. Juli 2012, 06:42
* Author: <a href="mailto:geronimo013@gmx.de">Geronimo</a>
* Project: libIO: classes for files, filesystem and input/output
*
* CMP - compound media player
*
* is a client/server mediaplayer intended to play any media from any workstation
* without the need to export or mount shares. cmps is an easy to use backend
* with a (ready to use) HTML-interface. Additionally the backend supports
* authentication via HTTP-digest authorization.
* cmpc is a client with vdr-like osd-menues.
*
* Copyright (c) 2012 Reinhard Mantey, some rights reserved!
* published under Creative Commons by-sa
* For details see http://creativecommons.org/licenses/by-sa/3.0/
*
* The cmp project's homepage is at http://projects.vdr-developer.org/projects/cmp
*
* --------------------------------------------------------------
*/
#include <CommandReader.h>
#include <Logging.h>
#include <stdarg.h>
#include <errno.h>
#include <wait.h>
int cCommandReader::fdMax = 0;
cCommandReader::cCommandReader(const char *cmd)
: pid(-1)
{
args.push_back(cmd);
}
cCommandReader::~cCommandReader()
{
Close();
}
void cCommandReader::AddCommandParameter(const char* Param)
{
args.push_back(Param);
}
void cCommandReader::Close(void)
{
int status = 0;
if (!fdMax) fdMax = getdtablesize();
if (fd > 0 && fd < fdMax) close(fd);
fd = -1;
if (pid != waitpid(pid, &status, 0))
esyslog("ERROR: failed to wait for child #%d - error #%d", pid, errno);
pid = -1;
}
bool cCommandReader::Open(void)
{
enum { FDRead, FDWrite };
int child2Parent[2] = {0};
if (pipe(child2Parent)) {
esyslog("ERROR: failed to create child2Parent-pipe #%d", errno);
return false;
}
switch ((pid = fork())) {
case -1:
esyslog("fork failed");
close(child2Parent[0]);
close(child2Parent[1]);
return false;
case 0: { /* child */
const char *cmdArgs[args.size() + 1];
for (size_t i=0; i < args.size(); ++i) {
cmdArgs[i] = args[i].c_str();
}
cmdArgs[args.size()] = 0;
if (dup2(child2Parent[FDWrite], STDOUT_FILENO) < 0) {
esyslog("ERROR: failed to create childs stdout #%d", errno);
exit(-1);
}
if (dup2(child2Parent[FDWrite], STDERR_FILENO) < 0) {
esyslog("ERROR: failed to create childs stderr #%d", errno);
exit(-1);
}
if (close(child2Parent[FDRead])) {
esyslog("ERROR: failed to close childs read-end of the pipe #%d", errno);
exit(-1);
}
execv(args[0].c_str(), (char *const*) cmdArgs);
esyslog("should never be reached! #1");
exit(-1);
} break;
default: { /* parent */
if (close(child2Parent[FDWrite])) {
esyslog("ERROR: failed to close write end from parent side!");
exit(-1);
}
fd = child2Parent[FDRead];
return true;
}
}
esyslog("should never be reached! #2");
close(child2Parent[0]);
close(child2Parent[1]);
return false;
}
|
