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https://github.com/jart/cosmopolitan.git
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e142124730
Our old code wasn't working with projects like Qt that call connect() in O_NONBLOCK mode multiple times. This change overhauls connect() to use a simpler WSAConnect() API and follows the same pattern as cosmo accept(). This change also reduces the binary footprint of read(), which no longer needs to depend on our enormous clock_gettime() function.
83 lines
4 KiB
C
83 lines
4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/cp.internal.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/fds.h"
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#include "libc/intrin/strace.h"
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#include "libc/sock/internal.h"
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#include "libc/sock/sock.h"
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#include "libc/sock/struct/sockaddr.h"
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#include "libc/sock/struct/sockaddr.internal.h"
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#include "libc/sock/syscall_fd.internal.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Connects socket to remote end.
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*
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* When `fd` is in `O_NONBLOCK` mode, this raises `EINPROGRESS`. To wait
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* for establishment poll() function may be called using `POLLOUT`. Then
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* `SO_ERROR` may be used to check for errors.
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*
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* Connectionless sockets, e.g. UDP, can be connected too. The benefit
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* is not needing to specify the remote address on each send. It also
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* means getsockname() can be called to retrieve routing details.
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*
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* On Linux, your `SO_SNDTIMEO` will timeout connect(). Other OSes (i.e.
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* Windows, MacOS, and BSDs) do not support this and will block forever.
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*
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* On Windows, when this function blocks, there may be a 10 millisecond
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* delay on the handling of signals or thread cancelation.
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*
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* @return 0 on success or -1 w/ errno
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* @raise EINPROGRESS if `O_NONBLOCK` and connecting process initiated
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* @raise EALREADY if a `O_NONBLOCK` connecting already in flight
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* @raise EADDRINUSE if local address is already in use
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* @raise EINTR if a signal handler was called instead
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* @raise ENETUNREACH if network is unreachable
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* @raise ETIMEDOUT if connection timed out
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* @raise EISCONN if already connected
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* @cancelationpoint
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* @asyncsignalsafe
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* @restartable (unless SO_RCVTIMEO)
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*/
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int connect(int fd, const struct sockaddr *addr, uint32_t addrsize) {
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int rc;
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BEGIN_CANCELATION_POINT;
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if (addr) {
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if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
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rc = enotsock();
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} else if (!IsWindows()) {
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rc = sys_connect(fd, addr, addrsize);
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} else if (!__isfdopen(fd)) {
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rc = ebadf();
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} else if (__isfdkind(fd, kFdSocket)) {
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rc = sys_connect_nt(&g_fds.p[fd], addr, addrsize);
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} else {
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rc = enotsock();
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}
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} else {
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rc = efault();
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}
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END_CANCELATION_POINT;
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STRACE("connect(%d, %s) → %d% lm", fd, DescribeSockaddr(addr, addrsize), rc);
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return rc;
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}
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