62 lines
3.0 KiB
C
62 lines
3.0 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/alg/alg.h"
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#include "libc/bits/safemacros.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/conv/conv.h"
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#include "libc/dce.h"
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#include "libc/log/log.h"
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#include "libc/nt/struct/teb.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/consts/o.h"
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#define kBufSize 1024
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#define kProcStatus "/proc/self/status"
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alignas(16) static const char kGdbPid[] = "TracerPid:\t";
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/**
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* Determines if gdb, strace, windbg, etc. is controlling process.
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* @return non-zero if attached, otherwise 0
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*/
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int IsDebuggerPresent(bool force) {
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int fd, res;
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ssize_t got;
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char buf[1024];
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res = 0;
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if (force || isempty(getenv("HEISENDEBUG"))) {
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if (IsWindows()) {
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res = NtGetPeb()->BeingDebugged;
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} else if (IsLinux()) {
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if ((fd = openat$sysv(AT_FDCWD, kProcStatus, O_RDONLY, 0)) != -1) {
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if ((got = read$sysv(fd, buf, sizeof(buf) - sizeof(kGdbPid))) != -1) {
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buf[got] = '\0';
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res = atoi(firstnonnull(strstr(buf, kGdbPid), kGdbPid) +
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strlen(kGdbPid));
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}
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close$sysv(fd);
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}
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}
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}
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return res;
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}
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