1dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* system/debuggerd/utility.c
2dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project**
3dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** Copyright 2008, The Android Open Source Project
4dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project**
5dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** Licensed under the Apache License, Version 2.0 (the "License");
6dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** you may not use this file except in compliance with the License.
7dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** You may obtain a copy of the License at
8dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project**
9dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project**     http://www.apache.org/licenses/LICENSE-2.0
10dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project**
11dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** Unless required by applicable law or agreed to in writing, software
12dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** distributed under the License is distributed on an "AS IS" BASIS,
13dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** See the License for the specific language governing permissions and
15dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** limitations under the License.
16dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project*/
17dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project
18053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown#include <stddef.h>
19053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown#include <stdbool.h>
20053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown#include <stdio.h>
21dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <string.h>
22053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown#include <errno.h>
23053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown#include <unistd.h>
24053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown#include <signal.h>
259227bd385504ace739d4451a6c5dc3d777b5bf21Colin Cross#include <log/logd.h>
2613e715b491e876865e752a3a69dd6f347049a488Jeff Brown#include <sys/ptrace.h>
27053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown#include <sys/wait.h>
28ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate#include <arpa/inet.h>
29ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate#include <assert.h>
30dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project
31dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "utility.h"
32dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project
33053b865412d1982ad1dc0e840898d82527deeb99Jeff Brownconst int sleep_time_usec = 50000;         /* 0.05 seconds */
34053b865412d1982ad1dc0e840898d82527deeb99Jeff Brownconst int max_total_sleep_usec = 10000000; /* 10 seconds */
3513e715b491e876865e752a3a69dd6f347049a488Jeff Brown
36ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tatestatic int write_to_am(int fd, const char* buf, int len) {
37ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    int to_write = len;
38ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    while (to_write > 0) {
39ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate        int written = TEMP_FAILURE_RETRY( write(fd, buf + len - to_write, to_write) );
40ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate        if (written < 0) {
41ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate            /* hard failure */
427716aef138e8029357a7b3dc6a73b41f4de4b0adChristopher Tate            LOG("AM write failure (%d / %s)\n", errno, strerror(errno));
43ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate            return -1;
44ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate        }
45ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate        to_write -= written;
46ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    }
47ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    return len;
48ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate}
49ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate
507716aef138e8029357a7b3dc6a73b41f4de4b0adChristopher Tatevoid _LOG(log_t* log, int scopeFlags, const char *fmt, ...) {
5113e715b491e876865e752a3a69dd6f347049a488Jeff Brown    char buf[512];
52ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    bool want_tfd_write;
53ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    bool want_log_write;
54ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    bool want_amfd_write;
557716aef138e8029357a7b3dc6a73b41f4de4b0adChristopher Tate    int len = 0;
5613e715b491e876865e752a3a69dd6f347049a488Jeff Brown
5713e715b491e876865e752a3a69dd6f347049a488Jeff Brown    va_list ap;
5813e715b491e876865e752a3a69dd6f347049a488Jeff Brown    va_start(ap, fmt);
5913e715b491e876865e752a3a69dd6f347049a488Jeff Brown
60ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    // where is the information going to go?
617716aef138e8029357a7b3dc6a73b41f4de4b0adChristopher Tate    want_tfd_write = log && log->tfd >= 0;
627716aef138e8029357a7b3dc6a73b41f4de4b0adChristopher Tate    want_log_write = IS_AT_FAULT(scopeFlags) && (!log || !log->quiet);
637716aef138e8029357a7b3dc6a73b41f4de4b0adChristopher Tate    want_amfd_write = IS_AT_FAULT(scopeFlags) && !IS_SENSITIVE(scopeFlags) && log && log->amfd >= 0;
64ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate
65ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    // if we're going to need the literal string, generate it once here
66ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    if (want_tfd_write || want_amfd_write) {
6713e715b491e876865e752a3a69dd6f347049a488Jeff Brown        vsnprintf(buf, sizeof(buf), fmt, ap);
6813e715b491e876865e752a3a69dd6f347049a488Jeff Brown        len = strlen(buf);
69ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    }
70ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate
71ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    if (want_tfd_write) {
72053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        write(log->tfd, buf, len);
7313e715b491e876865e752a3a69dd6f347049a488Jeff Brown    }
7413e715b491e876865e752a3a69dd6f347049a488Jeff Brown
75ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate    if (want_log_write) {
76ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate        // whatever goes to logcat also goes to the Activity Manager
7713e715b491e876865e752a3a69dd6f347049a488Jeff Brown        __android_log_vprint(ANDROID_LOG_INFO, "DEBUG", fmt, ap);
78ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate        if (want_amfd_write && len > 0) {
79ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate            int written = write_to_am(log->amfd, buf, len);
80ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate            if (written <= 0) {
81ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate                // timeout or other failure on write; stop informing the activity manager
82ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate                log->amfd = -1;
83ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate            }
84ded2e5acfcf0c705f08577d0ccb720bd5037f4baChristopher Tate        }
8513e715b491e876865e752a3a69dd6f347049a488Jeff Brown    }
86053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown    va_end(ap);
8713e715b491e876865e752a3a69dd6f347049a488Jeff Brown}
88dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project
89053b865412d1982ad1dc0e840898d82527deeb99Jeff Brownint wait_for_signal(pid_t tid, int* total_sleep_time_usec) {
90053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown    for (;;) {
91053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        int status;
92053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        pid_t n = waitpid(tid, &status, __WALL | WNOHANG);
93053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        if (n < 0) {
94053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown            if(errno == EAGAIN) continue;
95053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown            LOG("waitpid failed: %s\n", strerror(errno));
96053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown            return -1;
97053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        } else if (n > 0) {
98053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown            XLOG("waitpid: n=%d status=%08x\n", n, status);
99053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown            if (WIFSTOPPED(status)) {
100053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown                return WSTOPSIG(status);
10113e715b491e876865e752a3a69dd6f347049a488Jeff Brown            } else {
102053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown                LOG("unexpected waitpid response: n=%d, status=%08x\n", n, status);
103053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown                return -1;
10413e715b491e876865e752a3a69dd6f347049a488Jeff Brown            }
10513e715b491e876865e752a3a69dd6f347049a488Jeff Brown        }
10613e715b491e876865e752a3a69dd6f347049a488Jeff Brown
107053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        if (*total_sleep_time_usec > max_total_sleep_usec) {
108053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown            LOG("timed out waiting for tid=%d to die\n", tid);
109053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown            return -1;
11013e715b491e876865e752a3a69dd6f347049a488Jeff Brown        }
11113e715b491e876865e752a3a69dd6f347049a488Jeff Brown
112053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        /* not ready yet */
113053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        XLOG("not ready yet\n");
114053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        usleep(sleep_time_usec);
115053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        *total_sleep_time_usec += sleep_time_usec;
116dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project    }
117dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project}
118136dcc5ce628a1ba600a6818e5cb24d5f15eb016Andy McFadden
119053b865412d1982ad1dc0e840898d82527deeb99Jeff Brownvoid wait_for_stop(pid_t tid, int* total_sleep_time_usec) {
12013e715b491e876865e752a3a69dd6f347049a488Jeff Brown    siginfo_t si;
121053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown    while (TEMP_FAILURE_RETRY(ptrace(PTRACE_GETSIGINFO, tid, 0, &si)) < 0 && errno == ESRCH) {
122053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        if (*total_sleep_time_usec > max_total_sleep_usec) {
123053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown            LOG("timed out waiting for tid=%d to stop\n", tid);
12413e715b491e876865e752a3a69dd6f347049a488Jeff Brown            break;
12513e715b491e876865e752a3a69dd6f347049a488Jeff Brown        }
12613e715b491e876865e752a3a69dd6f347049a488Jeff Brown
127053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        usleep(sleep_time_usec);
128053b865412d1982ad1dc0e840898d82527deeb99Jeff Brown        *total_sleep_time_usec += sleep_time_usec;
129136dcc5ce628a1ba600a6818e5cb24d5f15eb016Andy McFadden    }
130136dcc5ce628a1ba600a6818e5cb24d5f15eb016Andy McFadden}
131