blob: 5d4055dd5fa46294fdadf4fb28169d8a783da704 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
// Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/
//
// SPDX-License-Identifier: BSD-2-Clause
#include <wasi/api.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
int fcntl(int fildes, int cmd, ...) {
switch (cmd) {
case F_GETFD:
// Act as if the close-on-exec flag is always set.
return FD_CLOEXEC;
case F_SETFD:
// The close-on-exec flag is ignored.
return 0;
case F_GETFL: {
// Obtain the flags and the rights of the descriptor.
__wasi_fdstat_t fds;
__wasi_errno_t error = __wasi_fd_fdstat_get(fildes, &fds);
if (error != 0) {
errno = error;
return -1;
}
// Roughly approximate the access mode by converting the rights.
int oflags = fds.fs_flags;
if ((fds.fs_rights_base &
(__WASI_RIGHTS_FD_READ | __WASI_RIGHTS_FD_READDIR)) != 0) {
if ((fds.fs_rights_base & __WASI_RIGHTS_FD_WRITE) != 0)
oflags |= O_RDWR;
else
oflags |= O_RDONLY;
} else if ((fds.fs_rights_base & __WASI_RIGHTS_FD_WRITE) != 0) {
oflags |= O_WRONLY;
} else {
oflags |= O_SEARCH;
}
return oflags;
}
case F_SETFL: {
// Set new file descriptor flags.
va_list ap;
va_start(ap, cmd);
int flags = va_arg(ap, int);
va_end(ap);
__wasi_fdflags_t fs_flags = flags & 0xfff;
__wasi_errno_t error =
__wasi_fd_fdstat_set_flags(fildes, fs_flags);
if (error != 0) {
errno = error;
return -1;
}
return 0;
}
default:
errno = EINVAL;
return -1;
}
}
|