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