1 /* Copyright (C) 1995-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <errno.h>
19 #include <sys/types.h>
20 #include <sys/ptrace.h>
21 #include <sys/user.h>
22 #include <stdarg.h>
23 #include <signal.h>
24
25 #include <sysdep.h>
26 #include <sys/syscall.h>
27
28 long int
ptrace(enum __ptrace_request request,...)29 ptrace (enum __ptrace_request request, ...)
30 {
31 long int res, ret;
32 va_list ap;
33 pid_t pid;
34 void *addr, *data;
35
36 va_start (ap, request);
37 pid = va_arg (ap, pid_t);
38 addr = va_arg (ap, void *);
39 data = va_arg (ap, void *);
40 va_end (ap);
41
42 if (request > 0 && request < 4)
43 data = &ret;
44
45 res = INLINE_SYSCALL (ptrace, 4, request, pid, addr, data);
46 if (res >= 0 && request > 0 && request < 4)
47 {
48 __set_errno (0);
49 return ret;
50 }
51
52 return res;
53 }
54