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Put more thought into i/o polyfills

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wait4() is now solid enough to run `make -j100` on Windows. You can now
use MSG_DONTWAIT on Windows. There was a handle leak in accept() that's
been fixed. Our WIN32 overlapped i/o code has been simplified. Priority
class now inherits into subprocesses, so the verynice command will work
and the signal mask will now be inherited by execve() and posix_spawn()
This commit is contained in:
Justine Tunney 2023-11-06 16:38:44 -08:00
parent 736fdb757a
commit e961385e55
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GPG key ID: BE714B4575D6E328
52 changed files with 679 additions and 487 deletions
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11
libc/sock/sendto-nt.c
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@ -25,8 +25,13 @@
#include "libc/sock/internal.h"
#include "libc/sock/syscall_fd.internal.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/errfuns.h"
#ifdef __x86_64__
#define _MSG_OOB 1
#define _MSG_DONTROUTE 4
#define _MSG_DONTWAIT 64
struct SendToArgs {
const struct iovec *iov;
size_t iovlen;
@ -47,12 +52,14 @@ static textwindows int sys_sendto_nt_start(int64_t handle,
textwindows ssize_t sys_sendto_nt(int fd, const struct iovec *iov,
size_t iovlen, uint32_t flags,
void *opt_in_addr, uint32_t in_addrsize) {
if (flags & ~(_MSG_DONTWAIT | _MSG_OOB | _MSG_DONTROUTE)) return einval();
ssize_t rc;
struct Fd *f = g_fds.p + fd;
sigset_t m = __sig_block();
bool nonblock = (f->flags & O_NONBLOCK) || (flags & _MSG_DONTWAIT);
flags &= ~_MSG_DONTWAIT;
rc = __winsock_block(
f->handle, flags, !!(f->flags & O_NONBLOCK), f->sndtimeo, m,
sys_sendto_nt_start,
f->handle, flags, nonblock, f->sndtimeo, m, sys_sendto_nt_start,
&(struct SendToArgs){iov, iovlen, opt_in_addr, in_addrsize});
__sig_unblock(m);
return rc;