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
|
#include "rsync.h"
/**
* Create a child connected to use on stdin/stdout.
*
* This is derived from CVS code
*
* Note that in the child STDIN is set to blocking and STDOUT
* is set to non-blocking. This is necessary as rsh relies on stdin being blocking
* and ssh relies on stdout being non-blocking
*
* If blocking_io is set then use blocking io on both fds. That can be
* used to cope with badly broken rsh implementations like the one on
* Solaris.
**/
pid_t piped_child(char **command, int *f_in, int *f_out)
{
pid_t pid;
int to_child_pipe[2];
int from_child_pipe[2];
extern int blocking_io;
if (verbose >= 2) {
print_child_argv(command);
}
if (fd_pair(to_child_pipe) < 0 || fd_pair(from_child_pipe) < 0) {
rprintf(FERROR, "pipe: %s\n", strerror(errno));
exit_cleanup(RERR_IPC);
}
pid = do_fork();
if (pid == -1) {
rprintf(FERROR, "fork: %s\n", strerror(errno));
exit_cleanup(RERR_IPC);
}
if (pid == 0) {
extern int orig_umask;
if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 ||
close(to_child_pipe[1]) < 0 ||
close(from_child_pipe[0]) < 0 ||
dup2(from_child_pipe[1], STDOUT_FILENO) < 0) {
rprintf(FERROR, "Failed to dup/close : %s\n",
strerror(errno));
exit_cleanup(RERR_IPC);
}
if (to_child_pipe[0] != STDIN_FILENO)
close(to_child_pipe[0]);
if (from_child_pipe[1] != STDOUT_FILENO)
close(from_child_pipe[1]);
umask(orig_umask);
set_blocking(STDIN_FILENO);
if (blocking_io) {
set_blocking(STDOUT_FILENO);
}
execvp(command[0], command);
rprintf(FERROR, "Failed to exec %s : %s\n",
command[0], strerror(errno));
exit_cleanup(RERR_IPC);
}
if (close(from_child_pipe[1]) < 0 || close(to_child_pipe[0]) < 0) {
rprintf(FERROR, "Failed to close : %s\n", strerror(errno));
exit_cleanup(RERR_IPC);
}
*f_in = from_child_pipe[0];
*f_out = to_child_pipe[1];
return pid;
}
pid_t local_child(int argc, char **argv,int *f_in,int *f_out,
int (*child_main)(int, char **))
{
pid_t pid;
int to_child_pipe[2];
int from_child_pipe[2];
extern int read_batch; /* dw */
if (fd_pair(to_child_pipe) < 0 ||
fd_pair(from_child_pipe) < 0) {
rprintf(FERROR,"pipe: %s\n",strerror(errno));
exit_cleanup(RERR_IPC);
}
pid = do_fork();
if (pid == -1) {
rprintf(FERROR,"fork: %s\n",strerror(errno));
exit_cleanup(RERR_IPC);
}
if (pid == 0) {
extern int am_sender;
extern int am_server;
am_sender = read_batch ? 0 : !am_sender;
am_server = 1;
if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 ||
close(to_child_pipe[1]) < 0 ||
close(from_child_pipe[0]) < 0 ||
dup2(from_child_pipe[1], STDOUT_FILENO) < 0) {
rprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno));
exit_cleanup(RERR_IPC);
}
if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]);
if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]);
child_main(argc, argv);
}
if (close(from_child_pipe[1]) < 0 ||
close(to_child_pipe[0]) < 0) {
rprintf(FERROR,"Failed to close : %s\n",strerror(errno));
exit_cleanup(RERR_IPC);
}
*f_in = from_child_pipe[0];
*f_out = to_child_pipe[1];
return pid;
}
|
