cosmopolitan/libc/calls/isdebuggerpresent.c

65 lines
3.1 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/alg/alg.h"
#include "libc/bits/safemacros.internal.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/conv/conv.h"
#include "libc/dce.h"
#include "libc/log/log.h"
#include "libc/nexgen32e/vendor.internal.h"
#include "libc/nt/struct/teb.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/consts/o.h"
#define kBufSize 1024
#define kProcStatus "/proc/self/status"
alignas(16) static const char kGdbPid[] = "TracerPid:\t";
/**
* Determines if gdb, strace, windbg, etc. is controlling process.
* @return non-zero if attached, otherwise 0
*/
int IsDebuggerPresent(bool force) {
int fd, res;
ssize_t got;
char buf[1024];
res = 0;
if (!force) {
if (getenv("HEISENDEBUG")) return false;
if (IsGenuineCosmo()) return false;
}
if (IsWindows()) {
res = NtGetPeb()->BeingDebugged;
} else if (IsLinux()) {
if ((fd = openat$sysv(AT_FDCWD, kProcStatus, O_RDONLY, 0)) != -1) {
if ((got = read$sysv(fd, buf, sizeof(buf) - sizeof(kGdbPid))) != -1) {
buf[got] = '\0';
res =
atoi(firstnonnull(strstr(buf, kGdbPid), kGdbPid) + strlen(kGdbPid));
}
close$sysv(fd);
}
}
return res;
}