1 /*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <cutils/zygote.h>
18
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <unistd.h>
22 #include <errno.h>
23 #include <sys/types.h>
24 #include <sys/wait.h>
25 #include <signal.h>
26
27 #ifndef NELEM
28 # define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))
29 #endif
30
31 // pid of child process
32 static pid_t g_pid = -1;
33
signal_forwarder(int signal,siginfo_t * si,void * context)34 static void signal_forwarder (int signal, siginfo_t *si, void *context)
35 {
36 if (g_pid >= 0) {
37 kill(g_pid, signal);
38 }
39 }
40
post_run_func(int pid)41 static void post_run_func (int pid) {
42 int my_pgid;
43 int spawned_pgid;
44 int i;
45 int err;
46
47 g_pid = pid;
48
49 my_pgid = getpgid(0);
50 if (my_pgid < 0) {
51 perror ("error with getpgid()");
52 exit (-1);
53 }
54
55 spawned_pgid = getpgid(pid);
56 if (spawned_pgid < 0) {
57 perror ("error with getpgid()");
58 exit (-1);
59 }
60
61 if (my_pgid != spawned_pgid) {
62 // The zygote was unable to move this process into our pgid
63 // We have to forward signals
64
65 int forward_signals[]
66 = {SIGHUP, SIGINT, SIGTERM, SIGWINCH,
67 SIGTSTP, SIGTTIN, SIGTTOU, SIGCONT};
68
69 struct sigaction sa;
70 memset(&sa, 0, sizeof(sa));
71
72 sa.sa_sigaction = signal_forwarder;
73 sa.sa_flags = SA_SIGINFO;
74
75 for (i = 0; i < NELEM(forward_signals); i++) {
76 err = sigaction(forward_signals[i], &sa, NULL);
77 if (err < 0) {
78 perror ("unexpected error");
79 exit (-1);
80 }
81 }
82 }
83 }
84
usage(const char * argv0)85 static void usage(const char *argv0) {
86 fprintf(stderr,"Usage: %s [--help] [-classpath <classpath>] \n"
87 "\t[additional zygote args] fully.qualified.java.ClassName [args]\n", argv0);
88 fprintf(stderr, "\nRequests a new Dalvik VM instance to be spawned from the zygote\n"
89 "process. stdin, stdout, and stderr are hooked up. This process remains\n"
90 "while the spawned VM instance is alive and forwards some signals.\n"
91 "The exit code of the spawned VM instance is dropped.\n");
92 }
93
main(int argc,const char ** argv)94 int main (int argc, const char **argv) {
95 int err;
96
97 if (argc > 1 && 0 == strcmp(argv[1], "--help")) {
98 usage(argv[0]);
99 exit(0);
100 }
101
102 err = zygote_run_wait(argc - 1, argv + 1, post_run_func);
103
104 if (err < 0) {
105 fprintf(stderr, "%s error: no zygote process found\n", argv[0]);
106 exit(-1);
107 }
108 exit(0);
109 }
110