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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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17
libc/sock/sendto-nt.c
View file

@ -21,6 +21,7 @@
#include "libc/nt/struct/overlapped.h"
#include "libc/nt/winsock.h"
#include "libc/sock/internal.h"
#include "libc/sock/syscall_fd.internal.h"
#include "libc/sysv/errfuns.h"
textwindows ssize_t sys_sendto_nt(int fd, const struct iovec *iov,
@ -30,15 +31,19 @@ textwindows ssize_t sys_sendto_nt(int fd, const struct iovec *iov,
uint32_t sent = 0;
struct SockFd *sockfd;
struct NtIovec iovnt[16];
struct NtOverlapped overlapped = {.hEvent = WSACreateEvent()};
if (_check_interrupts(true, g_fds.p)) return -1;
if (!WSASendTo(g_fds.p[fd].handle, iovnt, __iovec2nt(iovnt, iov, iovlen),
&sent, flags, opt_in_addr, in_addrsize, &overlapped, NULL)) {
rc = sent;
struct NtOverlapped overlapped = {.hEvent = WSACreateEvent()};
if (!WSASendTo(g_fds.p[fd].handle, iovnt, __iovec2nt(iovnt, iov, iovlen), 0,
flags, opt_in_addr, in_addrsize, &overlapped, NULL)) {
if (WSAGetOverlappedResult(g_fds.p[fd].handle, &overlapped, &sent, false,
&flags)) {
rc = sent;
} else {
rc = -1;
}
} else {
sockfd = (struct SockFd *)g_fds.p[fd].extra;
rc = __wsablock(g_fds.p[fd].handle, &overlapped, &flags, true,
sockfd->sndtimeo);
rc = __wsablock(g_fds.p + fd, &overlapped, &flags, true, sockfd->sndtimeo);
}
WSACloseEvent(overlapped.hEvent);
return rc;