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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/* process.c
*
* Copyright (C) 2008 Till Kamppeter <till.kamppeter@gmail.com>
* Copyright (C) 2008 Lars Uebernickel <larsuebernickel@gmx.de>
*
* This file is part of foomatic-rip.
*
* Foomatic-rip is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Foomatic-rip is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "foomaticrip.h"
#include "process.h"
#include <unistd.h>
#include "util.h"
#include <sys/wait.h>
#include <errno.h>
#include <stdlib.h>
int kidgeneration = 0;
struct process {
char name[64];
pid_t pid;
int isgroup;
};
#define MAX_CHILDS 4
struct process procs[MAX_CHILDS] = {
{ "", -1, 0 },
{ "", -1, 0 },
{ "", -1, 0 },
{ "", -1, 0 }
};
void add_process(const char *name, int pid, int isgroup)
{
int i;
for (i = 0; i < MAX_CHILDS; i++) {
if (procs[i].pid == -1) {
strlcpy(procs[i].name, name, 64);
procs[i].pid = pid;
procs[i].isgroup = isgroup;
return;
}
}
rip_die(EXIT_PRNERR_NORETRY_BAD_SETTINGS, "Didn't think there would be that many child processes... Exiting.\n");
}
int find_process(int pid)
{
int i;
for (i = 0; i < MAX_CHILDS; i++)
if (procs[i].pid == pid)
return i;
return -1;
}
void clear_proc_list()
{
int i;
for (i = 0; i < MAX_CHILDS; i++)
procs[i].pid = -1;
}
void kill_all_processes()
{
int i;
for (i = 0; i < MAX_CHILDS; i++) {
if (procs[i].pid == -1)
continue;
_log("Killing %s\n", procs[i].name);
kill(procs[i].isgroup ? -procs[i].pid : procs[i].pid, 15);
sleep(1 << (3 - kidgeneration));
kill(procs[i].isgroup ? -procs[i].pid : procs[i].pid, 9);
}
clear_proc_list();
}
static int _start_process(const char *name,
int (*proc_func)(FILE *, FILE *, void *),
void *user_arg, FILE **pipe_in, FILE **pipe_out,
int createprocessgroup)
{
pid_t pid;
int pfdin[2], pfdout[2];
int ret;
FILE *in, *out;
if (pipe_in)
pipe(pfdin);
if (pipe_out)
pipe(pfdout);
_log("Starting process \"%s\" (generation %d)\n", name, kidgeneration +1);
pid = fork();
if (pid < 0) {
_log("Could not fork for %s\n", name);
if (pipe_in) {
close(pfdin[0]);
close(pfdin[1]);
}
if (pipe_out) {
close(pfdout[0]);
close(pfdout[1]);
}
return -1;
}
if (pid == 0) { /* Child */
if (pipe_in) {
close(pfdin[1]);
in = fdopen(pfdin[0], "r");
}
else
in = NULL;
if (pipe_out) {
close(pfdout[0]);
out = fdopen(pfdout[1], "w");
}
else
out = NULL;
if (createprocessgroup)
setpgid(0, 0);
kidgeneration++;
/* The subprocess list is only valid for the parent. Clear it. */
clear_proc_list();
ret = proc_func(in, out, user_arg);
exit(ret);
}
/* Parent */
if (pipe_in) {
close(pfdin[0]);
*pipe_in = fdopen(pfdin[1], "w");
if (!*pipe_in)
_log("fdopen: %s\n", strerror(errno));
}
if (pipe_out) {
close(pfdout[1]);
*pipe_out = fdopen(pfdout[0], "r");
if (!*pipe_out)
_log("fdopen: %s\n", strerror(errno));
}
/* Add the child process to the list of open processes (to be able to kill
* them in case of a signal. */
add_process(name, pid, createprocessgroup);
return pid;
}
int exec_command(FILE *in, FILE *out, void *cmd)
{
if (in && dup2(fileno(in), fileno(stdin)) < 0)
rip_die(EXIT_PRNERR_NORETRY_BAD_SETTINGS, "%s: Could not dup stdin\n", (const char *)cmd);
if (out && dup2(fileno(out), fileno(stdout)) < 0)
rip_die(EXIT_PRNERR_NORETRY_BAD_SETTINGS, "%s: Could not dup stdout\n", (const char *)cmd);
execl(get_modern_shell(), get_modern_shell(), "-c", (const char *)cmd, (char *)NULL);
_log("Error: Executing \"%s -c %s\" failed (%s).\n", get_modern_shell(), (const char *)cmd, strerror(errno));
return EXIT_PRNERR_NORETRY_BAD_SETTINGS;
}
int start_system_process(const char *name, const char *command, FILE **fdin, FILE **fdout)
{
return _start_process(name, exec_command, (void*)command, fdin, fdout, 1);
}
int start_process(const char *name, int (*proc_func)(FILE *, FILE *, void *), void *user_arg, FILE **fdin, FILE **fdout)
{
return _start_process(name, proc_func, user_arg, fdin, fdout, 0);
}
int wait_for_process(int pid)
{
int i;
int status;
i = find_process(pid);
if (i < 0) {
_log("No such process \"%d\"", pid);
return -1;
}
waitpid(procs[i].pid, &status, 0);
if (WIFEXITED(status))
_log("%s exited with status %d\n", procs[i].name, WEXITSTATUS(status));
else if (WIFSIGNALED(status))
_log("%s received signal %d\n", procs[i].name, WTERMSIG(status));
/* remove from process list */
procs[i].pid = -1;
return status;
}
int run_system_process(const char *name, const char *command)
{
int pid = start_system_process(name, command, NULL, NULL);
return wait_for_process(pid);
}
|
