cosmopolitan/libc/calls/fcntl.c

46 lines
2.4 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/dce.h"
/**
* Does things with file descriptor, via re-imagined hourglass api, e.g.
*
* CHECK_NE(-1, fcntl(fd, F_SETFD, FD_CLOEXEC));
*
* @param cmd can be F_{GET,SET}{FD,FL}, etc.
* @param arg can be FD_CLOEXEC, etc. depending
* @return 0 on success, or -1 w/ errno
* @asyncsignalsafe
* @syscall
*/
int fcntl(int fd, int cmd, ...) {
va_list va;
unsigned arg;
va_start(va, cmd);
arg = va_arg(va, unsigned);
va_end(va);
if (!IsWindows()) {
return fcntl$sysv(fd, cmd, arg);
} else {
return fcntl$nt(fd, cmd, arg);
}
}