1 /* system/debuggerd/utility.c
2 **
3 ** Copyright 2008, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17
18 #include <stddef.h>
19 #include <stdbool.h>
20 #include <stdio.h>
21 #include <string.h>
22 #include <errno.h>
23 #include <unistd.h>
24 #include <signal.h>
25 #include <cutils/logd.h>
26 #include <sys/ptrace.h>
27 #include <sys/wait.h>
28
29 #include "utility.h"
30
31 const int sleep_time_usec = 50000; /* 0.05 seconds */
32 const int max_total_sleep_usec = 10000000; /* 10 seconds */
33
_LOG(log_t * log,bool in_tombstone_only,const char * fmt,...)34 void _LOG(log_t* log, bool in_tombstone_only, const char *fmt, ...) {
35 char buf[512];
36
37 va_list ap;
38 va_start(ap, fmt);
39
40 if (log && log->tfd >= 0) {
41 int len;
42 vsnprintf(buf, sizeof(buf), fmt, ap);
43 len = strlen(buf);
44 write(log->tfd, buf, len);
45 }
46
47 if (!in_tombstone_only && (!log || !log->quiet)) {
48 __android_log_vprint(ANDROID_LOG_INFO, "DEBUG", fmt, ap);
49 }
50 va_end(ap);
51 }
52
wait_for_signal(pid_t tid,int * total_sleep_time_usec)53 int wait_for_signal(pid_t tid, int* total_sleep_time_usec) {
54 for (;;) {
55 int status;
56 pid_t n = waitpid(tid, &status, __WALL | WNOHANG);
57 if (n < 0) {
58 if(errno == EAGAIN) continue;
59 LOG("waitpid failed: %s\n", strerror(errno));
60 return -1;
61 } else if (n > 0) {
62 XLOG("waitpid: n=%d status=%08x\n", n, status);
63 if (WIFSTOPPED(status)) {
64 return WSTOPSIG(status);
65 } else {
66 LOG("unexpected waitpid response: n=%d, status=%08x\n", n, status);
67 return -1;
68 }
69 }
70
71 if (*total_sleep_time_usec > max_total_sleep_usec) {
72 LOG("timed out waiting for tid=%d to die\n", tid);
73 return -1;
74 }
75
76 /* not ready yet */
77 XLOG("not ready yet\n");
78 usleep(sleep_time_usec);
79 *total_sleep_time_usec += sleep_time_usec;
80 }
81 }
82
wait_for_stop(pid_t tid,int * total_sleep_time_usec)83 void wait_for_stop(pid_t tid, int* total_sleep_time_usec) {
84 siginfo_t si;
85 while (TEMP_FAILURE_RETRY(ptrace(PTRACE_GETSIGINFO, tid, 0, &si)) < 0 && errno == ESRCH) {
86 if (*total_sleep_time_usec > max_total_sleep_usec) {
87 LOG("timed out waiting for tid=%d to stop\n", tid);
88 break;
89 }
90
91 usleep(sleep_time_usec);
92 *total_sleep_time_usec += sleep_time_usec;
93 }
94 }
95