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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.
66 lines
3.1 KiB
C
66 lines
3.1 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 2022 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/struct/fd.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/strace.internal.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/sock.h"
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#include "libc/sysv/errfuns.h"
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static textwindows int sockatmark_nt(int fd, unsigned long magnum) {
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bool32 res;
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int64_t hand;
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uint32_t bytes;
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if (fd >= g_fds.n) return ebadf();
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if (g_fds.p[fd].kind != kFdSocket) return einval();
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hand = g_fds.p[fd].handle;
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if (WSAIoctl(hand, magnum, 0, 0, &res, sizeof(res), &bytes, 0, 0) == -1) {
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return __winsockerr();
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}
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return !res;
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}
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/**
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* Returns true if out of band data is available on socket for reading.
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*
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* @return 1 if OOB'd, 0 if not, or -1 w/ errno
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* @raise EBADF if `fd` isn't an open file descriptor
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* @raise EINVAL if `fd` isn't an appropriate file descriptor
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*/
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int sockatmark(int fd) {
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int rc;
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unsigned long magnum;
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if (IsLinux()) {
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magnum = 0x8905; // SIOCATMARK (Linux only)
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} else { //
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magnum = 0x40047307; // SIOCATMARK (BSD, Windows)
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}
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if (!IsWindows()) {
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if (sys_ioctl(fd, magnum, &rc) == -1) {
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rc = -1;
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}
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} else {
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rc = sockatmark_nt(fd, magnum);
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}
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STRACE("sockatmark(%d) → %d% m", fd, rc);
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return rc;
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}
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