133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include "linker.h"
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#include <sys/socket.h>
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#include <sys/un.h>
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void notify_gdb_of_libraries();
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#define RETRY_ON_EINTR(ret,cond) \
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do { \
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ret = (cond); \
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} while (ret < 0 && errno == EINTR)
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static int socket_abstract_client(const char *name, int type)
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{
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struct sockaddr_un addr;
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size_t namelen;
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socklen_t alen;
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int s, err;
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namelen = strlen(name);
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// Test with length +1 for the *initial* '\0'.
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if ((namelen + 1) > sizeof(addr.sun_path)) {
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errno = EINVAL;
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return -1;
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}
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/* This is used for abstract socket namespace, we need
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* an initial '\0' at the start of the Unix socket path.
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*
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* Note: The path in this case is *not* supposed to be
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* '\0'-terminated. ("man 7 unix" for the gory details.)
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*/
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memset (&addr, 0, sizeof addr);
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addr.sun_family = AF_LOCAL;
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addr.sun_path[0] = 0;
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memcpy(addr.sun_path + 1, name, namelen);
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alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1;
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s = socket(AF_LOCAL, type, 0);
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if(s < 0) return -1;
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RETRY_ON_EINTR(err,connect(s, (struct sockaddr *) &addr, alen));
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if (err < 0) {
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close(s);
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s = -1;
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}
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return s;
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}
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void debugger_signal_handler(int n)
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{
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unsigned tid;
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int s;
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/* avoid picking up GC interrupts */
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signal(SIGUSR1, SIG_IGN);
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tid = gettid();
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s = socket_abstract_client("android:debuggerd", SOCK_STREAM);
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if(s >= 0) {
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/* debugger knows our pid from the credentials on the
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* local socket but we need to tell it our tid. It
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* is paranoid and will verify that we are giving a tid
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* that's actually in our process
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*/
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int ret;
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RETRY_ON_EINTR(ret, write(s, &tid, sizeof(unsigned)));
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if (ret == sizeof(unsigned)) {
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/* if the write failed, there is no point to read on
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* the file descriptor. */
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RETRY_ON_EINTR(ret, read(s, &tid, 1));
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notify_gdb_of_libraries();
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}
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close(s);
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}
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/* remove our net so we fault for real when we return */
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signal(n, SIG_IGN);
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}
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void debugger_init()
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{
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signal(SIGILL, debugger_signal_handler);
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signal(SIGABRT, debugger_signal_handler);
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signal(SIGBUS, debugger_signal_handler);
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signal(SIGFPE, debugger_signal_handler);
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signal(SIGSEGV, debugger_signal_handler);
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signal(SIGSTKFLT, debugger_signal_handler);
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signal(SIGPIPE, debugger_signal_handler);
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}
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