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
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131

//! The Unix `fcntl` function is effectively lots of different functions
//! hidden behind a single dynamic dispatch interface. In order to provide
//! a type-safe API, rustix makes them all separate functions so that they
//! can have dedicated static type signatures.

use crate::imp;
use crate::io::{self, OwnedFd};
use imp::fd::{AsFd, RawFd};
use imp::fs::types::{FdFlags, OFlags};

/// `fcntl(fd, F_GETFD)`—Returns a file descriptor's flags.
///
/// # References
///  - [POSIX]
///  - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
#[inline]
#[doc(alias = "F_GETFD")]
pub fn fcntl_getfd<Fd: AsFd>(fd: Fd) -> io::Result<FdFlags> {
    imp::fs::syscalls::fcntl_getfd(fd.as_fd())
}

/// `fcntl(fd, F_SETFD, flags)`—Sets a file descriptor's flags.
///
/// # References
///  - [POSIX]
///  - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
#[inline]
#[doc(alias = "F_SETFD")]
pub fn fcntl_setfd<Fd: AsFd>(fd: Fd, flags: FdFlags) -> io::Result<()> {
    imp::fs::syscalls::fcntl_setfd(fd.as_fd(), flags)
}

/// `fcntl(fd, F_GETFL)`—Returns a file descriptor's access mode and status.
///
/// # References
///  - [POSIX]
///  - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
#[inline]
#[doc(alias = "F_GETFL")]
pub fn fcntl_getfl<Fd: AsFd>(fd: Fd) -> io::Result<OFlags> {
    imp::fs::syscalls::fcntl_getfl(fd.as_fd())
}

/// `fcntl(fd, F_SETFL, flags)`—Sets a file descriptor's status.
///
/// # References
///  - [POSIX]
///  - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
#[inline]
#[doc(alias = "F_SETFL")]
pub fn fcntl_setfl<Fd: AsFd>(fd: Fd, flags: OFlags) -> io::Result<()> {
    imp::fs::syscalls::fcntl_setfl(fd.as_fd(), flags)
}

/// `fcntl(fd, F_GET_SEALS)`
///
/// # References
///  - [Linux]
///
/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
#[cfg(any(
    target_os = "android",
    target_os = "freebsd",
    target_os = "fuchsia",
    target_os = "linux",
))]
#[inline]
#[doc(alias = "F_GET_SEALS")]
pub fn fcntl_get_seals<Fd: AsFd>(fd: Fd) -> io::Result<SealFlags> {
    imp::fs::syscalls::fcntl_get_seals(fd.as_fd())
}

#[cfg(any(
    target_os = "android",
    target_os = "freebsd",
    target_os = "fuchsia",
    target_os = "linux",
))]
pub use imp::fs::types::SealFlags;

/// `fcntl(fd, F_ADD_SEALS)`
///
/// # References
///  - [Linux]
///
/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
#[cfg(any(
    target_os = "android",
    target_os = "freebsd",
    target_os = "fuchsia",
    target_os = "linux",
))]
#[inline]
#[doc(alias = "F_ADD_SEALS")]
pub fn fcntl_add_seals<Fd: AsFd>(fd: Fd, seals: SealFlags) -> io::Result<()> {
    imp::fs::syscalls::fcntl_add_seals(fd.as_fd(), seals)
}

/// `fcntl(fd, F_DUPFD_CLOEXEC)`—Creates a new `OwnedFd` instance, with value
/// at least `min`, that has `O_CLOEXEC` set and that shares the same
/// underlying [file description] as `fd`.
///
/// POSIX guarantees that `F_DUPFD_CLOEXEC` will use the lowest unused file
/// descriptor which is at least `min`, however it is not safe in general to
/// rely on this, as file descriptors may be unexpectedly allocated on other
/// threads or in libraries.
///
/// # References
///  - [POSIX]
///  - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
#[cfg(not(target_os = "wasi"))]
#[inline]
#[doc(alias = "F_DUPFD_CLOEXEC")]
pub fn fcntl_dupfd_cloexec<Fd: AsFd>(fd: Fd, min: RawFd) -> io::Result<OwnedFd> {
    imp::fs::syscalls::fcntl_dupfd_cloexec(fd.as_fd(), min)
}