131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/* system/debuggerd/utility.c
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**
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** Copyright 2008, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <signal.h>
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#include <cutils/logd.h>
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#include <sys/ptrace.h>
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#include <sys/wait.h>
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#include <arpa/inet.h>
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#include <assert.h>
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#include "utility.h"
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const int sleep_time_usec = 50000; /* 0.05 seconds */
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const int max_total_sleep_usec = 10000000; /* 10 seconds */
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static int write_to_am(int fd, const char* buf, int len) {
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int to_write = len;
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while (to_write > 0) {
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int written = TEMP_FAILURE_RETRY( write(fd, buf + len - to_write, to_write) );
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if (written < 0) {
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/* hard failure */
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LOG("AM write failure (%d / %s)\n", errno, strerror(errno));
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return -1;
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}
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to_write -= written;
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}
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return len;
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}
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void _LOG(log_t* log, int scopeFlags, const char *fmt, ...) {
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char buf[512];
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bool want_tfd_write;
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bool want_log_write;
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bool want_amfd_write;
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int len = 0;
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va_list ap;
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va_start(ap, fmt);
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// where is the information going to go?
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want_tfd_write = log && log->tfd >= 0;
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want_log_write = IS_AT_FAULT(scopeFlags) && (!log || !log->quiet);
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want_amfd_write = IS_AT_FAULT(scopeFlags) && !IS_SENSITIVE(scopeFlags) && log && log->amfd >= 0;
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// if we're going to need the literal string, generate it once here
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if (want_tfd_write || want_amfd_write) {
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vsnprintf(buf, sizeof(buf), fmt, ap);
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len = strlen(buf);
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}
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if (want_tfd_write) {
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write(log->tfd, buf, len);
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}
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if (want_log_write) {
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// whatever goes to logcat also goes to the Activity Manager
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__android_log_vprint(ANDROID_LOG_INFO, "DEBUG", fmt, ap);
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if (want_amfd_write && len > 0) {
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int written = write_to_am(log->amfd, buf, len);
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if (written <= 0) {
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// timeout or other failure on write; stop informing the activity manager
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log->amfd = -1;
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}
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}
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}
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va_end(ap);
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}
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int wait_for_signal(pid_t tid, int* total_sleep_time_usec) {
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for (;;) {
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int status;
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pid_t n = waitpid(tid, &status, __WALL | WNOHANG);
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if (n < 0) {
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if(errno == EAGAIN) continue;
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LOG("waitpid failed: %s\n", strerror(errno));
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return -1;
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} else if (n > 0) {
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XLOG("waitpid: n=%d status=%08x\n", n, status);
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if (WIFSTOPPED(status)) {
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return WSTOPSIG(status);
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} else {
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LOG("unexpected waitpid response: n=%d, status=%08x\n", n, status);
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return -1;
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}
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}
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if (*total_sleep_time_usec > max_total_sleep_usec) {
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LOG("timed out waiting for tid=%d to die\n", tid);
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return -1;
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}
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/* not ready yet */
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XLOG("not ready yet\n");
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usleep(sleep_time_usec);
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*total_sleep_time_usec += sleep_time_usec;
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}
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}
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void wait_for_stop(pid_t tid, int* total_sleep_time_usec) {
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siginfo_t si;
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while (TEMP_FAILURE_RETRY(ptrace(PTRACE_GETSIGINFO, tid, 0, &si)) < 0 && errno == ESRCH) {
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if (*total_sleep_time_usec > max_total_sleep_usec) {
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LOG("timed out waiting for tid=%d to stop\n", tid);
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break;
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}
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usleep(sleep_time_usec);
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*total_sleep_time_usec += sleep_time_usec;
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}
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}
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