mirror of
https://github.com/jart/cosmopolitan.git
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69 lines
3.2 KiB
C
69 lines
3.2 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/cp.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/getenv.internal.h"
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#include "libc/intrin/promises.internal.h"
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#include "libc/log/libfatal.internal.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/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 kPid "TracerPid:\t"
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static textwindows dontasan bool IsBeingDebugged(void) {
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return !!NtGetPeb()->BeingDebugged;
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}
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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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/* asan runtime depends on this function */
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ssize_t got;
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int e, fd, res;
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char *p, buf[1024];
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if (!force && IsGenuineBlink()) return 0;
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if (!force && __getenv(environ, "HEISENDEBUG").s) return 0;
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if (IsWindows()) return IsBeingDebugged();
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if (__isworker) return false;
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if (!PLEDGED(RPATH)) return false;
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res = 0;
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e = errno;
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BEGIN_CANCELLATION_POINT;
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if ((fd = __sys_openat(AT_FDCWD, "/proc/self/status", O_RDONLY, 0)) >= 0) {
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if ((got = sys_read(fd, buf, sizeof(buf) - 1)) > 0) {
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buf[got] = '\0';
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if ((p = __strstr(buf, kPid))) {
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p += sizeof(kPid) - 1;
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res = __atoul(p);
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}
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}
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sys_close(fd);
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}
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END_CANCELLATION_POINT;
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errno = e;
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return res;
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}
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