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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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102 changed files with 678 additions and 331 deletions
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8
libc/calls/fixupnewfd.c
View file

@ -26,9 +26,15 @@
// Applies file descriptor fixups on XNU or old Linux.
// See __fixupnewsockfd() for socket file descriptors.
int __fixupnewfd(int fd, int flags) {
int file_mode;
if (fd != -1) {
if (flags & O_CLOEXEC) {
_npassert(!__sys_fcntl(fd, F_SETFD, FD_CLOEXEC));
_unassert((file_mode = __sys_fcntl(fd, F_GETFD)) != -1);
_unassert(!__sys_fcntl(fd, F_SETFD, file_mode | FD_CLOEXEC));
}
if (flags & O_NONBLOCK) {
_unassert((file_mode = __sys_fcntl(fd, F_GETFL)) != -1);
_unassert(!__sys_fcntl(fd, F_SETFL, file_mode | O_NONBLOCK));
}
}
return fd;