139 lines
2.3 KiB
C
139 lines
2.3 KiB
C
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// SPDX-License-Identifier: LGPL-3.0-or-later
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/**
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* \file sys/dbg_unix.c
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*
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* Implements debugging utilities for Unix platforms.
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*
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* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
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* \author Lorenzo Cogotti
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*/
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#include "sys/dbg.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef __GNUC__
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#include <execinfo.h>
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#endif
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Boolean Sys_IsDebuggerPresent(void)
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{
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#ifdef __linux__
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// Read process status file
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char buf[4096];
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int fd = open("/proc/self/status", O_RDONLY);
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if (fd < 0)
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return FALSE;
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ssize_t n = read(fd, buf, sizeof(buf) - 1);
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close(fd);
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if (n < 0)
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return FALSE;
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buf[n] = '\0';
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const char *tracer = "TracerPid:\t";
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const char *pos = strstr(buf, tracer);
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if (!pos)
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return FALSE;
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pos += strlen(tracer);
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pid_t pid = atol(pos);
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return pid > 0;
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#else
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// TODO MacOS, BSD via sysctl()
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// http://developer.apple.com/qa/qa2004/qa1361.html
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// https://github.com/chromium/chromium/blob/master/base/debug/debugger_posix.cc
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return FALSE;
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#endif
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}
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size_t Sys_GetBacktrace(void **dest, size_t n)
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{
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USED(dest);
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USED(n);
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#ifdef __GNUC__
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if (n > (size_t) (INT_MAX - 1))
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n = INT_MAX - 1;
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void **trace = (void **) alloca(sizeof(*trace) * (n + 1));
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int res = backtrace(trace, n + 1);
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if (res > 0) {
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// Exclude ourselves from the trace
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res--;
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memcpy(dest, trace + 1, res * sizeof(*dest));
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return res;
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}
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#endif
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return 0;
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}
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void *Sys_GetCaller(void)
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{
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#ifdef __GNUC__
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void *trace[3]; // ourselves, caller, caller's caller
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int n = backtrace(trace, ARRAY_SIZE(trace));
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if (n == ARRAY_SIZE(trace))
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return trace[2];
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#endif
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return NULL;
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}
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char *Sys_GetSymbolName(void *sym)
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{
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USED(sym);
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#ifdef __GNUC__
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static THREAD_LOCAL char buf[128];
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char **names = backtrace_symbols(&sym, 1);
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if (names) {
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size_t n = strlen(names[0]);
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if (n > sizeof(buf) - 1) {
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// Truncate symbol
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n = sizeof(buf) - 4;
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memcpy(buf, names[0], n);
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buf[n+0] = '.'; buf[n+1] = '.'; buf[n+2] = '.';
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buf[n+3] = '\0';
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} else {
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memcpy(buf, names[0], n + 1);
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}
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free(names);
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return buf;
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}
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#endif
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return NULL;
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}
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void Sys_DumpBacktrace(ConHn hn, void **trace, size_t n)
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{
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USED(hn);
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USED(trace);
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USED(n);
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#ifdef __GNUC__
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backtrace_symbols_fd(trace, MIN(n, (size_t) INT_MAX), hn);
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#endif
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}
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