mirror of
https://github.com/jart/cosmopolitan.git
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1d4eb08fa1
This change introduces new tests for `O_NONBLOCK` and `SOCK_NONBLOCK` to
confirm that non-blocking i/o is now working on all supported platforms,
including Windows. For example, you can now say on Windows, MacOS, etc.:
socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP);
To create a non-blocking IPv4 TCP socket. Or you can enable non-blocking
i/o on an existing socket / pipe / etc. file descriptor by calling fcntl
fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
This functionality is polyfilled on older Linux kernels too, e.g. RHEL5.
Now that fcntl() support is much better the FIOCLEX / FIONCLEX polyfills
for ioctl() have been removed since they're ugly non-POSIX diameond APIs
This change fixes a weakness in kprintf() that was causing Windows trace
tools to frequently crash.
125 lines
5.2 KiB
C
125 lines
5.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net 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/internal.h"
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#include "libc/calls/state.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/nt/winsock.h"
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#include "libc/sock/internal.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/struct/sockaddr6.h"
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#include "libc/sock/syscall_fd.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/af.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/sock.h"
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union AcceptExAddr {
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union sockaddr_storage_linux addr;
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char buf[sizeof(struct sockaddr_storage) + 16];
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};
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struct AcceptExBuffer {
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union AcceptExAddr local;
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union AcceptExAddr remote;
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};
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static void CopyLinuxSockAddr(const union sockaddr_storage_linux *addr,
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void *out_addr, uint32_t *inout_addrsize) {
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uint32_t insize, outsize;
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if (out_addr && inout_addrsize) {
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if (addr->sa.sa_family == AF_INET) {
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outsize = sizeof(struct sockaddr_in);
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} else if (addr->sa.sa_family == AF_INET6) {
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outsize = sizeof(struct sockaddr_in6);
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} else if (addr->sa.sa_family == AF_UNIX) {
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outsize = sizeof(addr->sun.sun_family) +
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strnlen(addr->sun.sun_path, sizeof(addr->sun.sun_path)) + 1;
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} else {
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outsize = sizeof(union sockaddr_storage_linux);
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}
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insize = *inout_addrsize;
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if (insize) bzero(out_addr, insize);
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outsize = MIN(insize, outsize);
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if (outsize) memcpy(out_addr, addr, outsize);
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*inout_addrsize = outsize;
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}
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}
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textwindows int sys_accept_nt(struct Fd *fd, void *out_addr,
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uint32_t *inout_addrsize, int accept4_flags) {
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int64_t handle;
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int rc, client, oflags;
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uint32_t bytes_received;
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uint32_t completion_flags;
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struct AcceptExBuffer buffer;
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struct SockFd *sockfd, *sockfd2;
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// deliver interrupt instead if any are pending
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if (_check_interrupts(true, g_fds.p)) {
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return -1;
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}
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// creates resources for child socket
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// inherit the listener configuration
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sockfd = (struct SockFd *)fd->extra;
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if (!(sockfd2 = malloc(sizeof(struct SockFd)))) {
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return -1;
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}
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memcpy(sockfd2, sockfd, sizeof(*sockfd));
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if ((handle = WSASocket(sockfd2->family, sockfd2->type, sockfd2->protocol,
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NULL, 0, kNtWsaFlagOverlapped)) == -1) {
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free(sockfd2);
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return __winsockerr();
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}
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// accept network connection
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struct NtOverlapped overlapped = {.hEvent = WSACreateEvent()};
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if (!AcceptEx(fd->handle, handle, &buffer, 0, sizeof(buffer.local),
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sizeof(buffer.remote), &bytes_received, &overlapped)) {
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sockfd = (struct SockFd *)fd->extra;
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if (__wsablock(fd, &overlapped, &completion_flags, true,
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sockfd->rcvtimeo) == -1) {
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WSACloseEvent(overlapped.hEvent);
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__sys_closesocket_nt(handle);
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free(sockfd2);
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return -1;
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}
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}
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WSACloseEvent(overlapped.hEvent);
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// create file descriptor for new socket
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// don't inherit the file open mode bits
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oflags = 0;
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if (accept4_flags & SOCK_CLOEXEC) oflags |= O_CLOEXEC;
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if (accept4_flags & SOCK_NONBLOCK) oflags |= O_NONBLOCK;
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__fds_lock();
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client = __reservefd_unlocked(-1);
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g_fds.p[client].kind = kFdSocket;
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g_fds.p[client].flags = oflags;
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g_fds.p[client].mode = 0140666;
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g_fds.p[client].handle = handle;
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g_fds.p[client].extra = (uintptr_t)sockfd2;
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__fds_unlock();
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// handoff information to caller;
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CopyLinuxSockAddr(&buffer.remote.addr, out_addr, inout_addrsize);
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return client;
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}
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