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Support non-blocking i/o across platforms

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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.
This commit is contained in:
Justine Tunney 2023-07-23 02:56:47 -07:00
parent 5c9e03e3e0
commit 1d4eb08fa1
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GPG key ID: BE714B4575D6E328
102 changed files with 678 additions and 331 deletions
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3
libc/sock/connect-nt.c
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@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/intrin/bsr.h"
#include "libc/nt/winsock.h"
#include "libc/sock/internal.h"
#include "libc/sock/syscall_fd.internal.h"
@ -29,7 +30,7 @@ textwindows int sys_connect_nt(struct Fd *fd, const void *addr,
sockfd = (struct SockFd *)fd->extra;
_npassert(fd->kind == kFdSocket);
return __winsockblock(
fd->handle, FD_CONNECT_BIT,
fd->handle, _bsr(kNtFdConnect),
WSAConnect(fd->handle, addr, addrsize, NULL, NULL, NULL, NULL),
sockfd->rcvtimeo);
}