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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/syscall_fd.internal.h
View file

@ -2,6 +2,7 @@
#define COSMOPOLITAN_LIBC_SOCK_SYSCALL_INTERNAL_H_
#include "libc/calls/struct/fd.internal.h"
#include "libc/calls/struct/iovec.h"
#include "libc/nt/struct/overlapped.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
@ -18,6 +19,8 @@ int sys_shutdown_nt(struct Fd *, int) _Hide;
ssize_t sys_recv_nt(struct Fd *, const struct iovec *, size_t, uint32_t) _Hide;
ssize_t sys_recvfrom_nt(struct Fd *, const struct iovec *, size_t, uint32_t,
void *, uint32_t *) _Hide;
int __wsablock(struct Fd *, struct NtOverlapped *, uint32_t *, bool,
uint32_t) _Hide;
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */