1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <stdarg.h>
30 #include <fcntl.h>
31
32 #include "private/bionic_fdtrack.h"
33
34 #if defined(__LP64__)
35
36 extern "C" int __fcntl(int fd, int cmd, ...);
37
fcntl(int fd,int cmd,...)38 int fcntl(int fd, int cmd, ...) {
39 va_list args;
40 va_start(args, cmd);
41
42 // This is a bit sketchy, especially because arg can be an int, but all of our
43 // supported 64-bit ABIs pass arg in a register.
44 void* arg = va_arg(args, void*);
45 va_end(args);
46
47 int rc = __fcntl(fd, cmd, arg);
48 if (cmd == F_DUPFD) {
49 return FDTRACK_CREATE_NAME("F_DUPFD", rc);
50 } else if (cmd == F_DUPFD_CLOEXEC) {
51 return FDTRACK_CREATE_NAME("F_DUPFD_CLOEXEC", rc);
52 }
53 return rc;
54 }
55
56 #else
57
58 extern "C" int __fcntl64(int, int, ...);
59
60 // For fcntl we use the fcntl64 system call to signal that we're using struct flock64.
fcntl(int fd,int cmd,...)61 int fcntl(int fd, int cmd, ...) {
62 va_list ap;
63
64 va_start(ap, cmd);
65 void* arg = va_arg(ap, void*);
66 va_end(ap);
67
68 if (cmd == F_DUPFD) {
69 return FDTRACK_CREATE_NAME("F_DUPFD", __fcntl64(fd, cmd, arg));
70 } else if (cmd == F_DUPFD_CLOEXEC) {
71 return FDTRACK_CREATE_NAME("F_DUPFD_CLOEXEC", __fcntl64(fd, cmd, arg));
72 }
73 return __fcntl64(fd, cmd, arg);
74 }
75
76 #endif
77