1 /*
2 * Copyright (C) 2008 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 <errno.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <sys/wait.h>
21 #include <unistd.h>
22
23 #include <logwrap/logwrap.h>
24 #include <cutils/klog.h>
25
26 #include "cutils/log.h"
27
fatal(const char * msg)28 void fatal(const char *msg) {
29 fprintf(stderr, "%s", msg);
30 ALOG(LOG_ERROR, "logwrapper", "%s", msg);
31 exit(-1);
32 }
33
usage()34 void usage() {
35 fatal(
36 "Usage: logwrapper [-a] [-d] [-k] BINARY [ARGS ...]\n"
37 "\n"
38 "Forks and executes BINARY ARGS, redirecting stdout and stderr to\n"
39 "the Android logging system. Tag is set to BINARY, priority is\n"
40 "always LOG_INFO.\n"
41 "\n"
42 "-a: Causes logwrapper to do abbreviated logging.\n"
43 " This logs up to the first 4K and last 4K of the command\n"
44 " being run, and logs the output when the command exits\n"
45 "-d: Causes logwrapper to SIGSEGV when BINARY terminates\n"
46 " fault address is set to the status of wait()\n"
47 "-k: Causes logwrapper to log to the kernel log instead of\n"
48 " the Android system log\n");
49 }
50
main(int argc,char * argv[])51 int main(int argc, char* argv[]) {
52 int seg_fault_on_exit = 0;
53 int log_target = LOG_ALOG;
54 bool abbreviated = false;
55 int ch;
56 int status = 0xAAAA;
57 int rc;
58
59 while ((ch = getopt(argc, argv, "adk")) != -1) {
60 switch (ch) {
61 case 'a':
62 abbreviated = true;
63 break;
64 case 'd':
65 seg_fault_on_exit = 1;
66 break;
67 case 'k':
68 log_target = LOG_KLOG;
69 klog_set_level(6);
70 break;
71 case '?':
72 default:
73 usage();
74 }
75 }
76 argc -= optind;
77 argv += optind;
78
79 if (argc < 1) {
80 usage();
81 }
82
83 rc = android_fork_execvp_ext(argc, &argv[0], &status, true,
84 log_target, abbreviated, NULL, NULL, 0);
85 if (!rc) {
86 if (WIFEXITED(status))
87 rc = WEXITSTATUS(status);
88 else
89 rc = -ECHILD;
90 }
91
92 if (seg_fault_on_exit) {
93 uintptr_t fault_address = (uintptr_t) status;
94 *(int *) fault_address = 0; // causes SIGSEGV with fault_address = status
95 }
96
97 return rc;
98 }
99