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debuggerd_handler: add and use fatal_errno.

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Bug: none
Test: mma
Change-Id: I24d913abdbe74f9463feda78f7817ca8b92af9cc
This commit is contained in:
Josh Gao 2017-01-31 13:13:46 -08:00
parent 301e7e2cdb
commit 6462bb41e0
1 changed files with 22 additions and 11 deletions
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33
debuggerd/handler/debuggerd_handler.cpp
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@ -67,11 +67,22 @@ static debuggerd_callbacks_t g_callbacks;
static pthread_mutex_t crash_mutex = PTHREAD_MUTEX_INITIALIZER;
// Don't use __libc_fatal because it exits via abort, which might put us back into a signal handler.
#define fatal(...) \
do { \
__libc_format_log(ANDROID_LOG_FATAL, "libc", __VA_ARGS__); \
_exit(1); \
} while (0)
static void __noreturn __printflike(1, 2) fatal(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
__libc_format_log_va_list(ANDROID_LOG_FATAL, "libc", fmt, args);
_exit(1);
}
static void __noreturn __printflike(1, 2) fatal_errno(const char* fmt, ...) {
int err = errno;
va_list args;
va_start(args, fmt);
char buf[4096];
vsnprintf(buf, sizeof(buf), fmt, args);
fatal("%s: %s", buf, strerror(err));
}
/*
* Writes a summary of the signal to the log file. We do this so that, if
@ -192,7 +203,7 @@ static int debuggerd_dispatch_pseudothread(void* arg) {
int pipefds[2];
if (pipe(pipefds) != 0) {
fatal("failed to create pipe");
fatal_errno("failed to create pipe");
}
// Don't use fork(2) to avoid calling pthread_atfork handlers.
@ -209,7 +220,7 @@ static int debuggerd_dispatch_pseudothread(void* arg) {
snprintf(buf, sizeof(buf), "%d", thread_info->crashing_tid);
execl(CRASH_DUMP_PATH, CRASH_DUMP_NAME, buf, nullptr);
fatal("exec failed: %s", strerror(errno));
fatal_errno("exec failed");
} else {
close(pipefds[1]);
char buf[4];
@ -264,7 +275,7 @@ static void resend_signal(siginfo_t* info, bool crash_dump_started) {
if (crash_dump_started || info->si_signo != DEBUGGER_SIGNAL) {
int rc = syscall(SYS_rt_tgsigqueueinfo, getpid(), gettid(), info->si_signo, info);
if (rc != 0) {
fatal("failed to resend signal during crash: %s", strerror(errno));
fatal_errno("failed to resend signal during crash");
}
}
@ -336,7 +347,7 @@ static void debuggerd_signal_handler(int signal_number, siginfo_t* info, void*)
CLONE_THREAD | CLONE_SIGHAND | CLONE_VM | CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID,
&thread_info, nullptr, nullptr, &thread_info.pseudothread_tid);
if (child_pid == -1) {
fatal("failed to spawn debuggerd dispatch thread: %s", strerror(errno));
fatal_errno("failed to spawn debuggerd dispatch thread");
}
// Wait for the child to start...
@ -366,12 +377,12 @@ void debuggerd_init(debuggerd_callbacks_t* callbacks) {
void* thread_stack_allocation =
mmap(nullptr, PAGE_SIZE * 3, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (thread_stack_allocation == MAP_FAILED) {
fatal("failed to allocate debuggerd thread stack");
fatal_errno("failed to allocate debuggerd thread stack");
}
char* stack = static_cast<char*>(thread_stack_allocation) + PAGE_SIZE;
if (mprotect(stack, PAGE_SIZE, PROT_READ | PROT_WRITE) != 0) {
fatal("failed to mprotect debuggerd thread stack");
fatal_errno("failed to mprotect debuggerd thread stack");
}
// Stack grows negatively, set it to the last byte in the page...