mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
49 lines
2.8 KiB
C
49 lines
2.8 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"
|
||
#include "libc/intrin/asan.internal.h"
|
||
#include "libc/sock/internal.h"
|
||
#include "libc/sock/sock.h"
|
||
#include "libc/sysv/errfuns.h"
|
||
|
||
/**
|
||
* Waits for something to happen on multiple file descriptors at once.
|
||
*
|
||
* @param fds[𝑖].fd should have been created with SOCK_NONBLOCK passed
|
||
* to socket() or accept4()
|
||
* @param fds[𝑖].events flags can have POLL{IN,OUT,PRI}
|
||
* @param timeout_ms if 0 means don't wait and -1 means wait forever
|
||
* @return number of items fds whose revents field has been set to
|
||
* nonzero to describe its events, or -1 w/ errno
|
||
* @return fds[𝑖].revents flags can have:
|
||
* (fds[𝑖].events & POLL{IN,OUT,PRI,HUP,ERR,NVAL})
|
||
* @asyncsignalsafe
|
||
*/
|
||
int poll(struct pollfd *fds, uint64_t nfds, int32_t timeout_ms) {
|
||
if (IsAsan() && !__asan_is_valid(fds, nfds * sizeof(struct pollfd))) {
|
||
return efault();
|
||
}
|
||
if (!IsWindows()) {
|
||
return sys_poll(fds, nfds, timeout_ms);
|
||
} else {
|
||
return sys_poll_nt(fds, nfds, timeout_ms);
|
||
}
|
||
}
|