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
132
133
134
135
136
137
138
139
140
141
//! 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.
//!
//! `fcntl` functions which are not specific to files or directories live in
//! the [`io`] module instead.
//!
//! [`io`]: crate::io

use crate::{backend, io};
use backend::fd::{AsFd, OwnedFd, RawFd};

pub use backend::io::types::FdFlags;

/// `fcntl(fd, F_GETFD)`—Returns a file descriptor's flags.
///
/// # References
///  - [POSIX]
///  - [Linux]
///  - [Apple]
///  - [FreeBSD]
///  - [NetBSD]
///  - [OpenBSD]
///  - [DragonFly BSD]
///  - [illumos]
///  - [glibc]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=fcntl&sektion=2
/// [NetBSD]: https://man.netbsd.org/fcntl.2
/// [OpenBSD]: https://man.openbsd.org/fcntl.2
/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=fcntl&section=2
/// [illumos]: https://illumos.org/man/2/fcntl
/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Control-Operations.html#index-fcntl-function
#[inline]
#[doc(alias = "F_GETFD")]
pub fn fcntl_getfd<Fd: AsFd>(fd: Fd) -> io::Result<FdFlags> {
    backend::io::syscalls::fcntl_getfd(fd.as_fd())
}

/// `fcntl(fd, F_SETFD, flags)`—Sets a file descriptor's flags.
///
/// # References
///  - [POSIX]
///  - [Linux]
///  - [Apple]
///  - [FreeBSD]
///  - [NetBSD]
///  - [OpenBSD]
///  - [DragonFly BSD]
///  - [illumos]
///  - [glibc]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=fcntl&sektion=2
/// [NetBSD]: https://man.netbsd.org/fcntl.2
/// [OpenBSD]: https://man.openbsd.org/fcntl.2
/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=fcntl&section=2
/// [illumos]: https://illumos.org/man/2/fcntl
/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Control-Operations.html#index-fcntl-function
#[inline]
#[doc(alias = "F_SETFD")]
pub fn fcntl_setfd<Fd: AsFd>(fd: Fd, flags: FdFlags) -> io::Result<()> {
    backend::io::syscalls::fcntl_setfd(fd.as_fd(), flags)
}

/// `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]
///  - [Apple]
///  - [FreeBSD]
///  - [NetBSD]
///  - [OpenBSD]
///  - [DragonFly BSD]
///  - [illumos]
///  - [glibc]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=fcntl&sektion=2
/// [NetBSD]: https://man.netbsd.org/fcntl.2
/// [OpenBSD]: https://man.openbsd.org/fcntl.2
/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=fcntl&section=2
/// [illumos]: https://illumos.org/man/2/fcntl
/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Control-Operations.html#index-fcntl-function
#[cfg(not(any(target_os = "espidf", target_os = "wasi")))]
#[inline]
#[doc(alias = "F_DUPFD_CLOEXEC")]
pub fn fcntl_dupfd_cloexec<Fd: AsFd>(fd: Fd, min: RawFd) -> io::Result<OwnedFd> {
    backend::io::syscalls::fcntl_dupfd_cloexec(fd.as_fd(), min)
}

/// `fcntl(fd, F_DUPFD)`—Creates a new `OwnedFd` instance, with value at
/// least `min`, that shares the same underlying [file description] as `fd`.
///
/// POSIX guarantees that `F_DUPFD` 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]
///  - [Apple]
///  - [FreeBSD]
///  - [NetBSD]
///  - [OpenBSD]
///  - [DragonFly BSD]
///  - [illumos]
///  - [glibc]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fcntl.html
/// [Linux]: https://man7.org/linux/man-pages/man2/fcntl.2.html
/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/fcntl.2.html
/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=fcntl&sektion=2
/// [NetBSD]: https://man.netbsd.org/fcntl.2
/// [OpenBSD]: https://man.openbsd.org/fcntl.2
/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=fcntl&section=2
/// [illumos]: https://illumos.org/man/2/fcntl
/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Control-Operations.html#index-fcntl-function
#[cfg(target_os = "espidf")]
#[inline]
#[doc(alias = "F_DUPFD")]
pub fn fcntl_dupfd<Fd: AsFd>(fd: Fd, min: RawFd) -> io::Result<OwnedFd> {
    backend::io::syscalls::fcntl_dupfd(fd.as_fd(), min)
}