1 /*
2 * Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without modification,
5 * are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright notice, this list of
8 * conditions and the following disclaimer.
9 *
10 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
11 * of conditions and the following disclaimer in the documentation and/or other materials
12 * provided with the distribution.
13 *
14 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
15 * to endorse or promote products derived from this software without specific prior written
16 * permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 /****************************************************************************
32 * Included Files
33 ****************************************************************************/
34 #include "fs/file.h"
35 #include "fs/fd_table.h"
36 #include "fs/fs_operation.h"
37 #include "sys/types.h"
38 #include "sys/uio.h"
39
40 /****************************************************************************
41 * Private Functions
42 ****************************************************************************/
FcntlDupFd(int procfd,int leastFd)43 static int FcntlDupFd(int procfd, int leastFd)
44 {
45 int sysfd = GetAssociatedSystemFd(procfd);
46 if ((sysfd < 0) || (sysfd >= CONFIG_NFILE_DESCRIPTORS)) {
47 return -EBADF;
48 }
49
50 if (CheckProcessFd(leastFd) != OK) {
51 return -EINVAL;
52 }
53
54 int dupFd = AllocLowestProcessFd(leastFd);
55 if (dupFd < 0) {
56 return -EMFILE;
57 }
58
59 files_refer(sysfd);
60 AssociateSystemFd(dupFd, sysfd);
61
62 return dupFd;
63 }
64
65 /****************************************************************************
66 * Public Functions
67 ****************************************************************************/
VfsFcntl(int procfd,int cmd,...)68 int VfsFcntl(int procfd, int cmd, ...)
69 {
70 va_list ap;
71 int ret = 0;
72
73 va_start(ap, cmd);
74 switch (cmd) {
75 case F_DUPFD:
76 {
77 int arg = va_arg(ap, int);
78 ret = FcntlDupFd(procfd, arg);
79 }
80 break;
81 case F_GETFD:
82 {
83 bool isCloexec = CheckCloexecFlag(procfd);
84 ret = isCloexec ? FD_CLOEXEC : 0;
85 }
86 break;
87 case F_SETFD:
88 {
89 int oflags = va_arg(ap, int);
90 if (oflags & FD_CLOEXEC) {
91 SetCloexecFlag(procfd);
92 } else {
93 ClearCloexecFlag(procfd);
94 }
95 }
96 break;
97 default:
98 ret = CONTINE_NUTTX_FCNTL;
99 break;
100 }
101
102 va_end(ap);
103 return ret;
104 }
105