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zig/lib/std/c.zig
Andrew Kelley 3deda15e21 std.os reorganization, avoiding usingnamespace 
The main purpose of this branch is to explore avoiding the
`usingnamespace` feature of the zig language, specifically with regards
to `std.os` and related functionality.

If this experiment is successful, it will provide a data point on
whether or not it would be practical to entirely remove `usingnamespace`
from the language.

In this commit, `usingnamespace` has been completely eliminated from
the Linux x86_64 compilation path, aside from io_uring.

The behavior tests pass, however that's as far as this branch goes. It is
very breaking, and a lot more work is needed before it could be
considered mergeable. I wanted to put a pull requset up early so that
zig programmers have time to provide feedback.

This is progress towards closing #6600 since it clarifies where the
actual "owner" of each declaration is, and reduces the number of
different ways to import the same declarations.

One of the main organizational strategies used here is to do namespacing
with real namespaces (e.g. structs) rather than by having declarations
share a common prefix (the C strategy). It's no coincidence that
`usingnamespace` has similar semantics to `#include` and becomes much
less necessary when using proper namespaces.
2021-09-01 17:54:06 -07:00

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const std = @import("std");
const builtin = std.builtin;
const page_size = std.mem.page_size;
pub const tokenizer = @import("c/tokenizer.zig");
pub const Token = tokenizer.Token;
pub const Tokenizer = tokenizer.Tokenizer;
test {
_ = tokenizer;
}
pub usingnamespace switch (std.Target.current.os.tag) {
.linux => @import("c/linux.zig"),
.windows => @import("c/windows.zig"),
.macos, .ios, .tvos, .watchos => @import("c/darwin.zig"),
.freebsd, .kfreebsd => @import("c/freebsd.zig"),
.netbsd => @import("c/netbsd.zig"),
.dragonfly => @import("c/dragonfly.zig"),
.openbsd => @import("c/openbsd.zig"),
.haiku => @import("c/haiku.zig"),
.hermit => @import("c/hermit.zig"),
.solaris => @import("c/solaris.zig"),
.fuchsia => @import("c/fuchsia.zig"),
.minix => @import("c/minix.zig"),
.emscripten => @import("c/emscripten.zig"),
.wasi => @import("c/wasi.zig"),
else => struct {},
};
pub fn getErrno(rc: anytype) E {
if (rc == -1) {
return @intToEnum(E, _errno().*);
} else {
return .SUCCESS;
}
}
/// The return type is `type` to force comptime function call execution.
/// TODO: https://github.com/ziglang/zig/issues/425
/// If not linking libc, returns struct{pub const ok = false;}
/// If linking musl libc, returns struct{pub const ok = true;}
/// If linking gnu libc (glibc), the `ok` value will be true if the target
/// version is greater than or equal to `glibc_version`.
/// If linking a libc other than these, returns `false`.
pub fn versionCheck(glibc_version: builtin.Version) type {
return struct {
pub const ok = blk: {
if (!builtin.link_libc) break :blk false;
if (std.Target.current.abi.isMusl()) break :blk true;
if (std.Target.current.isGnuLibC()) {
const ver = std.Target.current.os.version_range.linux.glibc;
const order = ver.order(glibc_version);
break :blk switch (order) {
.gt, .eq => true,
.lt => false,
};
} else {
break :blk false;
}
};
};
}
pub extern "c" var environ: [*:null]?[*:0]u8;
pub extern "c" fn fopen(noalias filename: [*:0]const u8, noalias modes: [*:0]const u8) ?*FILE;
pub extern "c" fn fclose(stream: *FILE) c_int;
pub extern "c" fn fwrite(noalias ptr: [*]const u8, size_of_type: usize, item_count: usize, noalias stream: *FILE) usize;
pub extern "c" fn fread(noalias ptr: [*]u8, size_of_type: usize, item_count: usize, noalias stream: *FILE) usize;
pub extern "c" fn printf(format: [*:0]const u8, ...) c_int;
pub extern "c" fn abort() noreturn;
pub extern "c" fn exit(code: c_int) noreturn;
pub extern "c" fn _exit(code: c_int) noreturn;
pub extern "c" fn isatty(fd: fd_t) c_int;
pub extern "c" fn close(fd: fd_t) c_int;
pub extern "c" fn lseek(fd: fd_t, offset: off_t, whence: c_int) off_t;
pub extern "c" fn open(path: [*:0]const u8, oflag: c_uint, ...) c_int;
pub extern "c" fn openat(fd: c_int, path: [*:0]const u8, oflag: c_uint, ...) c_int;
pub extern "c" fn ftruncate(fd: c_int, length: off_t) c_int;
pub extern "c" fn raise(sig: c_int) c_int;
pub extern "c" fn read(fd: fd_t, buf: [*]u8, nbyte: usize) isize;
pub extern "c" fn readv(fd: c_int, iov: [*]const iovec, iovcnt: c_uint) isize;
pub extern "c" fn pread(fd: fd_t, buf: [*]u8, nbyte: usize, offset: off_t) isize;
pub extern "c" fn preadv(fd: c_int, iov: [*]const iovec, iovcnt: c_uint, offset: off_t) isize;
pub extern "c" fn writev(fd: c_int, iov: [*]const iovec_const, iovcnt: c_uint) isize;
pub extern "c" fn pwritev(fd: c_int, iov: [*]const iovec_const, iovcnt: c_uint, offset: off_t) isize;
pub extern "c" fn write(fd: fd_t, buf: [*]const u8, nbyte: usize) isize;
pub extern "c" fn pwrite(fd: fd_t, buf: [*]const u8, nbyte: usize, offset: off_t) isize;
pub extern "c" fn mmap(addr: ?*align(page_size) c_void, len: usize, prot: c_uint, flags: c_uint, fd: fd_t, offset: off_t) *c_void;
pub extern "c" fn munmap(addr: *align(page_size) const c_void, len: usize) c_int;
pub extern "c" fn mprotect(addr: *align(page_size) c_void, len: usize, prot: c_uint) c_int;
pub extern "c" fn link(oldpath: [*:0]const u8, newpath: [*:0]const u8, flags: c_int) c_int;
pub extern "c" fn linkat(oldfd: fd_t, oldpath: [*:0]const u8, newfd: fd_t, newpath: [*:0]const u8, flags: c_int) c_int;
pub extern "c" fn unlink(path: [*:0]const u8) c_int;
pub extern "c" fn unlinkat(dirfd: fd_t, path: [*:0]const u8, flags: c_uint) c_int;
pub extern "c" fn getcwd(buf: [*]u8, size: usize) ?[*]u8;
pub extern "c" fn waitpid(pid: pid_t, stat_loc: ?*c_int, options: c_int) pid_t;
pub extern "c" fn fork() c_int;
pub extern "c" fn access(path: [*:0]const u8, mode: c_uint) c_int;
pub extern "c" fn faccessat(dirfd: fd_t, path: [*:0]const u8, mode: c_uint, flags: c_uint) c_int;
pub extern "c" fn pipe(fds: *[2]fd_t) c_int;
pub extern "c" fn mkdir(path: [*:0]const u8, mode: c_uint) c_int;
pub extern "c" fn mkdirat(dirfd: fd_t, path: [*:0]const u8, mode: u32) c_int;
pub extern "c" fn symlink(existing: [*:0]const u8, new: [*:0]const u8) c_int;
pub extern "c" fn symlinkat(oldpath: [*:0]const u8, newdirfd: fd_t, newpath: [*:0]const u8) c_int;
pub extern "c" fn rename(old: [*:0]const u8, new: [*:0]const u8) c_int;
pub extern "c" fn renameat(olddirfd: fd_t, old: [*:0]const u8, newdirfd: fd_t, new: [*:0]const u8) c_int;
pub extern "c" fn chdir(path: [*:0]const u8) c_int;
pub extern "c" fn fchdir(fd: fd_t) c_int;
pub extern "c" fn execve(path: [*:0]const u8, argv: [*:null]const ?[*:0]const u8, envp: [*:null]const ?[*:0]const u8) c_int;
pub extern "c" fn dup(fd: fd_t) c_int;
pub extern "c" fn dup2(old_fd: fd_t, new_fd: fd_t) c_int;
pub extern "c" fn readlink(noalias path: [*:0]const u8, noalias buf: [*]u8, bufsize: usize) isize;
pub extern "c" fn readlinkat(dirfd: fd_t, noalias path: [*:0]const u8, noalias buf: [*]u8, bufsize: usize) isize;
pub usingnamespace switch (builtin.os.tag) {
.macos, .ios, .watchos, .tvos => struct {
pub const realpath = @"realpath$DARWIN_EXTSN";
pub const fstatat = _fstatat;
},
else => struct {
pub extern "c" fn realpath(noalias file_name: [*:0]const u8, noalias resolved_name: [*]u8) ?[*:0]u8;
pub extern "c" fn fstatat(dirfd: fd_t, path: [*:0]const u8, stat_buf: *libc_stat, flags: u32) c_int;
},
};
pub extern "c" fn rmdir(path: [*:0]const u8) c_int;
pub extern "c" fn getenv(name: [*:0]const u8) ?[*:0]u8;
pub extern "c" fn sysctl(name: [*]const c_int, namelen: c_uint, oldp: ?*c_void, oldlenp: ?*usize, newp: ?*c_void, newlen: usize) c_int;
pub extern "c" fn sysctlbyname(name: [*:0]const u8, oldp: ?*c_void, oldlenp: ?*usize, newp: ?*c_void, newlen: usize) c_int;
pub extern "c" fn sysctlnametomib(name: [*:0]const u8, mibp: ?*c_int, sizep: ?*usize) c_int;
pub extern "c" fn tcgetattr(fd: fd_t, termios_p: *termios) c_int;
pub extern "c" fn tcsetattr(fd: fd_t, optional_action: TCSA, termios_p: *const termios) c_int;
pub extern "c" fn fcntl(fd: fd_t, cmd: c_int, ...) c_int;
pub extern "c" fn flock(fd: fd_t, operation: c_int) c_int;
pub extern "c" fn ioctl(fd: fd_t, request: c_int, ...) c_int;
pub extern "c" fn uname(buf: *utsname) c_int;
pub extern "c" fn gethostname(name: [*]u8, len: usize) c_int;
pub extern "c" fn shutdown(socket: fd_t, how: c_int) c_int;
pub extern "c" fn bind(socket: fd_t, address: ?*const sockaddr, address_len: socklen_t) c_int;
pub extern "c" fn socketpair(domain: c_uint, sock_type: c_uint, protocol: c_uint, sv: *[2]fd_t) c_int;
pub extern "c" fn listen(sockfd: fd_t, backlog: c_uint) c_int;
pub extern "c" fn getsockname(sockfd: fd_t, noalias addr: *sockaddr, noalias addrlen: *socklen_t) c_int;
pub extern "c" fn getpeername(sockfd: fd_t, noalias addr: *sockaddr, noalias addrlen: *socklen_t) c_int;
pub extern "c" fn connect(sockfd: fd_t, sock_addr: *const sockaddr, addrlen: socklen_t) c_int;
pub extern "c" fn accept(sockfd: fd_t, noalias addr: ?*sockaddr, noalias addrlen: ?*socklen_t) c_int;
pub extern "c" fn accept4(sockfd: fd_t, noalias addr: ?*sockaddr, noalias addrlen: ?*socklen_t, flags: c_uint) c_int;
pub extern "c" fn getsockopt(sockfd: fd_t, level: u32, optname: u32, noalias optval: ?*c_void, noalias optlen: *socklen_t) c_int;
pub extern "c" fn setsockopt(sockfd: fd_t, level: u32, optname: u32, optval: ?*const c_void, optlen: socklen_t) c_int;
pub extern "c" fn send(sockfd: fd_t, buf: *const c_void, len: usize, flags: u32) isize;
pub extern "c" fn sendto(
sockfd: fd_t,
buf: *const c_void,
len: usize,
flags: u32,
dest_addr: ?*const sockaddr,
addrlen: socklen_t,
) isize;
pub extern "c" fn sendmsg(sockfd: fd_t, msg: *const std.x.os.Socket.Message, flags: c_int) isize;
pub extern "c" fn recv(sockfd: fd_t, arg1: ?*c_void, arg2: usize, arg3: c_int) isize;
pub extern "c" fn recvfrom(
sockfd: fd_t,
noalias buf: *c_void,
len: usize,
flags: u32,
noalias src_addr: ?*sockaddr,
noalias addrlen: ?*socklen_t,
) isize;
pub extern "c" fn recvmsg(sockfd: fd_t, msg: *std.x.os.Socket.Message, flags: c_int) isize;
pub usingnamespace switch (builtin.os.tag) {
.netbsd => struct {
pub const clock_getres = __clock_getres50;
pub const clock_gettime = __clock_gettime50;
pub const fstat = __fstat50;
pub const getdents = __getdents30;
pub const getrusage = __getrusage50;
pub const gettimeofday = __gettimeofday50;
pub const nanosleep = __nanosleep50;
pub const sched_yield = __libc_thr_yield;
pub const sigaction = __sigaction14;
pub const sigaltstack = __sigaltstack14;
pub const sigprocmask = __sigprocmask14;
pub const socket = __socket30;
pub const stat = __stat50;
},
.macos, .ios, .watchos, .tvos => struct {
// XXX: close -> close$NOCANCEL
// XXX: getdirentries -> _getdirentries64
pub extern "c" fn clock_getres(clk_id: c_int, tp: *timespec) c_int;
pub extern "c" fn clock_gettime(clk_id: c_int, tp: *timespec) c_int;
pub const fstat = _fstat;
pub extern "c" fn getrusage(who: c_int, usage: *rusage) c_int;
pub extern "c" fn gettimeofday(noalias tv: ?*timeval, noalias tz: ?*timezone) c_int;
pub extern "c" fn nanosleep(rqtp: *const timespec, rmtp: ?*timespec) c_int;
pub extern "c" fn sched_yield() c_int;
pub extern "c" fn sigaction(sig: c_int, noalias act: ?*const Sigaction, noalias oact: ?*Sigaction) c_int;
pub extern "c" fn sigprocmask(how: c_int, noalias set: ?*const sigset_t, noalias oset: ?*sigset_t) c_int;
pub extern "c" fn socket(domain: c_uint, sock_type: c_uint, protocol: c_uint) c_int;
pub extern "c" fn stat(noalias path: [*:0]const u8, noalias buf: *libc_stat) c_int;
pub extern "c" fn sigfillset(set: ?*sigset_t) void;
pub extern "c" fn alarm(seconds: c_uint) c_uint;
pub extern "c" fn sigwait(set: ?*sigset_t, sig: ?*c_int) c_int;
},
.windows => struct {
// TODO: copied the else case and removed the socket function (because its in ws2_32)
// need to verify which of these is actually supported on windows
pub extern "c" fn clock_getres(clk_id: c_int, tp: *timespec) c_int;
pub extern "c" fn clock_gettime(clk_id: c_int, tp: *timespec) c_int;
pub extern "c" fn fstat(fd: fd_t, buf: *libc_stat) c_int;
pub extern "c" fn getrusage(who: c_int, usage: *rusage) c_int;
pub extern "c" fn gettimeofday(noalias tv: ?*timeval, noalias tz: ?*timezone) c_int;
pub extern "c" fn nanosleep(rqtp: *const timespec, rmtp: ?*timespec) c_int;
pub extern "c" fn sched_yield() c_int;
pub extern "c" fn sigaction(sig: c_int, noalias act: ?*const Sigaction, noalias oact: ?*Sigaction) c_int;
pub extern "c" fn sigprocmask(how: c_int, noalias set: ?*const sigset_t, noalias oset: ?*sigset_t) c_int;
pub extern "c" fn stat(noalias path: [*:0]const u8, noalias buf: *libc_stat) c_int;
pub extern "c" fn sigfillset(set: ?*sigset_t) void;
pub extern "c" fn alarm(seconds: c_uint) c_uint;
pub extern "c" fn sigwait(set: ?*sigset_t, sig: ?*c_int) c_int;
},
else => struct {
pub extern "c" fn clock_getres(clk_id: c_int, tp: *timespec) c_int;
pub extern "c" fn clock_gettime(clk_id: c_int, tp: *timespec) c_int;
pub extern "c" fn fstat(fd: fd_t, buf: *libc_stat) c_int;
pub extern "c" fn getrusage(who: c_int, usage: *rusage) c_int;
pub extern "c" fn gettimeofday(noalias tv: ?*timeval, noalias tz: ?*timezone) c_int;
pub extern "c" fn nanosleep(rqtp: *const timespec, rmtp: ?*timespec) c_int;
pub extern "c" fn sched_yield() c_int;
pub extern "c" fn sigaction(sig: c_int, noalias act: ?*const Sigaction, noalias oact: ?*Sigaction) c_int;
pub extern "c" fn sigprocmask(how: c_int, noalias set: ?*const sigset_t, noalias oset: ?*sigset_t) c_int;
pub extern "c" fn socket(domain: c_uint, sock_type: c_uint, protocol: c_uint) c_int;
pub extern "c" fn stat(noalias path: [*:0]const u8, noalias buf: *libc_stat) c_int;
pub extern "c" fn sigfillset(set: ?*sigset_t) void;
pub extern "c" fn alarm(seconds: c_uint) c_uint;
pub extern "c" fn sigwait(set: ?*sigset_t, sig: ?*c_int) c_int;
},
};
pub extern "c" fn kill(pid: pid_t, sig: c_int) c_int;
pub extern "c" fn getdirentries(fd: fd_t, buf_ptr: [*]u8, nbytes: usize, basep: *i64) isize;
pub extern "c" fn setuid(uid: uid_t) c_int;
pub extern "c" fn setgid(gid: gid_t) c_int;
pub extern "c" fn seteuid(euid: uid_t) c_int;
pub extern "c" fn setegid(egid: gid_t) c_int;
pub extern "c" fn setreuid(ruid: uid_t, euid: uid_t) c_int;
pub extern "c" fn setregid(rgid: gid_t, egid: gid_t) c_int;
pub extern "c" fn setresuid(ruid: uid_t, euid: uid_t, suid: uid_t) c_int;
pub extern "c" fn setresgid(rgid: gid_t, egid: gid_t, sgid: gid_t) c_int;
pub extern "c" fn malloc(usize) ?*c_void;
pub extern "c" fn realloc(?*c_void, usize) ?*c_void;
pub extern "c" fn free(?*c_void) void;
pub extern "c" fn futimes(fd: fd_t, times: *[2]timeval) c_int;
pub extern "c" fn utimes(path: [*:0]const u8, times: *[2]timeval) c_int;
pub extern "c" fn utimensat(dirfd: fd_t, pathname: [*:0]const u8, times: *[2]timespec, flags: u32) c_int;
pub extern "c" fn futimens(fd: fd_t, times: *const [2]timespec) c_int;
pub extern "c" fn pthread_create(noalias newthread: *pthread_t, noalias attr: ?*const pthread_attr_t, start_routine: fn (?*c_void) callconv(.C) ?*c_void, noalias arg: ?*c_void) E;
pub extern "c" fn pthread_attr_init(attr: *pthread_attr_t) E;
pub extern "c" fn pthread_attr_setstack(attr: *pthread_attr_t, stackaddr: *c_void, stacksize: usize) E;
pub extern "c" fn pthread_attr_setstacksize(attr: *pthread_attr_t, stacksize: usize) E;
pub extern "c" fn pthread_attr_setguardsize(attr: *pthread_attr_t, guardsize: usize) E;
pub extern "c" fn pthread_attr_destroy(attr: *pthread_attr_t) E;
pub extern "c" fn pthread_self() pthread_t;
pub extern "c" fn pthread_join(thread: pthread_t, arg_return: ?*?*c_void) E;
pub extern "c" fn pthread_detach(thread: pthread_t) E;
pub extern "c" fn pthread_atfork(
prepare: ?fn () callconv(.C) void,
parent: ?fn () callconv(.C) void,
child: ?fn () callconv(.C) void,
) c_int;
pub extern "c" fn pthread_key_create(key: *pthread_key_t, destructor: ?fn (value: *c_void) callconv(.C) void) E;
pub extern "c" fn pthread_key_delete(key: pthread_key_t) E;
pub extern "c" fn pthread_getspecific(key: pthread_key_t) ?*c_void;
pub extern "c" fn pthread_setspecific(key: pthread_key_t, value: ?*c_void) c_int;
pub extern "c" fn sem_init(sem: *sem_t, pshared: c_int, value: c_uint) c_int;
pub extern "c" fn sem_destroy(sem: *sem_t) c_int;
pub extern "c" fn sem_post(sem: *sem_t) c_int;
pub extern "c" fn sem_wait(sem: *sem_t) c_int;
pub extern "c" fn sem_trywait(sem: *sem_t) c_int;
pub extern "c" fn sem_timedwait(sem: *sem_t, abs_timeout: *const timespec) c_int;
pub extern "c" fn sem_getvalue(sem: *sem_t, sval: *c_int) c_int;
pub extern "c" fn kqueue() c_int;
pub extern "c" fn kevent(
kq: c_int,
changelist: [*]const Kevent,
nchanges: c_int,
eventlist: [*]Kevent,
nevents: c_int,
timeout: ?*const timespec,
) c_int;
pub extern "c" fn getaddrinfo(
noalias node: ?[*:0]const u8,
noalias service: ?[*:0]const u8,
noalias hints: ?*const addrinfo,
noalias res: **addrinfo,
) EAI;
pub extern "c" fn freeaddrinfo(res: *addrinfo) void;
pub extern "c" fn getnameinfo(
noalias addr: *const sockaddr,
addrlen: socklen_t,
noalias host: [*]u8,
hostlen: socklen_t,
noalias serv: [*]u8,
servlen: socklen_t,
flags: u32,
) EAI;
pub extern "c" fn gai_strerror(errcode: EAI) [*:0]const u8;
pub extern "c" fn poll(fds: [*]pollfd, nfds: nfds_t, timeout: c_int) c_int;
pub extern "c" fn ppoll(fds: [*]pollfd, nfds: nfds_t, timeout: ?*const timespec, sigmask: ?*const sigset_t) c_int;
pub extern "c" fn dn_expand(
msg: [*:0]const u8,
eomorig: [*:0]const u8,
comp_dn: [*:0]const u8,
exp_dn: [*:0]u8,
length: c_int,
) c_int;
pub const PTHREAD_MUTEX_INITIALIZER = pthread_mutex_t{};
pub extern "c" fn pthread_mutex_lock(mutex: *pthread_mutex_t) E;
pub extern "c" fn pthread_mutex_unlock(mutex: *pthread_mutex_t) E;
pub extern "c" fn pthread_mutex_trylock(mutex: *pthread_mutex_t) E;
pub extern "c" fn pthread_mutex_destroy(mutex: *pthread_mutex_t) E;
pub const PTHREAD_COND_INITIALIZER = pthread_cond_t{};
pub extern "c" fn pthread_cond_wait(noalias cond: *pthread_cond_t, noalias mutex: *pthread_mutex_t) E;
pub extern "c" fn pthread_cond_timedwait(noalias cond: *pthread_cond_t, noalias mutex: *pthread_mutex_t, noalias abstime: *const timespec) E;
pub extern "c" fn pthread_cond_signal(cond: *pthread_cond_t) E;
pub extern "c" fn pthread_cond_broadcast(cond: *pthread_cond_t) E;
pub extern "c" fn pthread_cond_destroy(cond: *pthread_cond_t) E;
pub extern "c" fn pthread_rwlock_destroy(rwl: *pthread_rwlock_t) callconv(.C) E;
pub extern "c" fn pthread_rwlock_rdlock(rwl: *pthread_rwlock_t) callconv(.C) E;
pub extern "c" fn pthread_rwlock_wrlock(rwl: *pthread_rwlock_t) callconv(.C) E;
pub extern "c" fn pthread_rwlock_tryrdlock(rwl: *pthread_rwlock_t) callconv(.C) E;
pub extern "c" fn pthread_rwlock_trywrlock(rwl: *pthread_rwlock_t) callconv(.C) E;
pub extern "c" fn pthread_rwlock_unlock(rwl: *pthread_rwlock_t) callconv(.C) E;
pub const pthread_t = *opaque {};
pub const FILE = opaque {};
pub extern "c" fn dlopen(path: [*:0]const u8, mode: c_int) ?*c_void;
pub extern "c" fn dlclose(handle: *c_void) c_int;
pub extern "c" fn dlsym(handle: ?*c_void, symbol: [*:0]const u8) ?*c_void;
pub extern "c" fn sync() void;
pub extern "c" fn syncfs(fd: c_int) c_int;
pub extern "c" fn fsync(fd: c_int) c_int;
pub extern "c" fn fdatasync(fd: c_int) c_int;
pub extern "c" fn prctl(option: c_int, ...) c_int;
pub extern "c" fn getrlimit(resource: rlimit_resource, rlim: *rlimit) c_int;
pub extern "c" fn setrlimit(resource: rlimit_resource, rlim: *const rlimit) c_int;
pub extern "c" fn fmemopen(noalias buf: ?*c_void, size: usize, noalias mode: [*:0]const u8) ?*FILE;
pub extern "c" fn syslog(priority: c_int, message: [*:0]const u8, ...) void;
pub extern "c" fn openlog(ident: [*:0]const u8, logopt: c_int, facility: c_int) void;
pub extern "c" fn closelog() void;
pub extern "c" fn setlogmask(maskpri: c_int) c_int;
pub const max_align_t = if (std.Target.current.abi == .msvc)
f64
else if (std.Target.current.isDarwin())
c_longdouble
else
extern struct {
a: c_longlong,
b: c_longdouble,
};
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