1 /**************************************************************************
3 * Copyright 2010-2011 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 **************************************************************************/
38 #if defined(__linux__)
39 #include <linux/limits.h> // PATH_MAX
43 #include <sys/syslimits.h> // PATH_MAX
44 #include <mach-o/dyld.h>
48 #warning PATH_MAX undefined
53 #include "os_string.hpp"
63 size_t size = PATH_MAX;
64 char *buf = path.buf(size);
66 // http://stackoverflow.com/questions/1023306/finding-current-executables-path-without-proc-self-exe
69 if (_NSGetExecutablePath(buf, &len) != 0) {
76 len = readlink("/proc/self/exe", buf, size - 1);
78 // /proc/self/exe is not available on setuid processes, so fallback to
79 // /proc/self/cmdline.
80 int fd = open("/proc/self/cmdline", O_RDONLY);
82 len = read(fd, buf, size - 1);
87 snprintf(buf, size, "%i", (int)getpid());
100 size_t size = PATH_MAX;
101 char *buf = path.buf(size);
111 String::exists(void) const
116 err = stat(str(), &st);
121 if (!S_ISREG(st.st_mode))
127 int execute(char * const * args)
132 execvp(args[0], args);
133 fprintf(stderr, "error: failed to execute %s\n", args[0]);
138 fprintf(stderr, "error: failed to fork\n");
142 waitpid(pid, &status, 0);
147 static volatile bool logging = false;
150 log(const char *format, ...)
154 va_start(ap, format);
156 vfprintf(stderr, format, ap);
168 static void (*gCallback)(void) = NULL;
170 #define NUM_SIGNALS 16
172 struct sigaction old_actions[NUM_SIGNALS];
177 * - http://sourceware.org/git/?p=glibc.git;a=blob;f=debug/segfault.c
178 * - http://ggi.cvs.sourceforge.net/viewvc/ggi/ggi-core/libgg/gg/cleanup.c?view=markup
181 signalHandler(int sig, siginfo_t *info, void *context)
184 * There are several signals that can happen when logging to stdout/stderr.
185 * For example, SIGPIPE will be emitted if stderr is a pipe with no
186 * readers. Therefore ignore any signal while logging by returning
187 * immediately, to prevent deadlocks.
193 static int recursion_count = 0;
195 log("apitrace: warning: caught signal %i\n", sig);
197 if (recursion_count) {
198 log("apitrace: warning: recursion handling signal %i\n", sig);
207 struct sigaction *old_action;
208 if (sig >= NUM_SIGNALS) {
209 /* This should never happen */
210 log("error: unexpected signal %i\n", sig);
213 old_action = &old_actions[sig];
215 if (old_action->sa_flags & SA_SIGINFO) {
216 // Handler is in sa_sigaction
217 old_action->sa_sigaction(sig, info, context);
219 if (old_action->sa_handler == SIG_DFL) {
220 log("apitrace: info: taking default action for signal %i\n", sig);
223 struct sigaction dfl_action;
224 dfl_action.sa_handler = SIG_DFL;
225 sigemptyset (&dfl_action.sa_mask);
226 dfl_action.sa_flags = 0;
227 sigaction(sig, &dfl_action, NULL);
233 } else if (old_action->sa_handler == SIG_IGN) {
236 /* dispatch to handler */
237 old_action->sa_handler(sig);
243 setExceptionCallback(void (*callback)(void))
247 gCallback = callback;
249 struct sigaction new_action;
250 new_action.sa_sigaction = signalHandler;
251 sigemptyset(&new_action.sa_mask);
252 new_action.sa_flags = SA_SIGINFO | SA_RESTART;
255 for (int sig = 1; sig < NUM_SIGNALS; ++sig) {
256 // SIGKILL and SIGSTOP can't be handled.
257 if (sig == SIGKILL || sig == SIGSTOP) {
262 * SIGPIPE can be emitted when writing to stderr that is redirected
263 * to a pipe without readers. It is also very unlikely to ocurr
264 * inside graphics APIs, and most applications where it can occur
265 * normally already ignore it. In summary, it is unlikely that a
266 * SIGPIPE will cause abnormal termination, which it is likely that
267 * intercepting here will cause problems, so simple don't intercept
270 if (sig == SIGPIPE) {
274 if (sigaction(sig, NULL, &old_actions[sig]) >= 0) {
275 sigaction(sig, &new_action, NULL);
282 resetExceptionCallback(void)