cosmopolitan/libc/calls/fcntl.c

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/*-*- 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
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#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
*/
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int fcntl(int fd, int cmd, ...) {
va_list va;
unsigned arg;
va_start(va, cmd);
arg = va_arg(va, unsigned);
va_end(va);
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if (!IsWindows()) {
return fcntl$sysv(fd, cmd, arg);
} else {
return fcntl$nt(fd, cmd, arg);
}
}