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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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13
libc/sock/recvfrom-nt.c
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@ -24,9 +24,15 @@
#include "libc/nt/winsock.h"
#include "libc/sock/internal.h"
#include "libc/sock/syscall_fd.internal.h"
#include "libc/sysv/consts/msg.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/errfuns.h"
#ifdef __x86_64__
#define _MSG_OOB 1
#define _MSG_PEEK 2
#define _MSG_DONTWAIT 64
struct RecvFromArgs {
const struct iovec *iov;
size_t iovlen;
@ -48,11 +54,14 @@ textwindows ssize_t sys_recvfrom_nt(int fd, const struct iovec *iov,
size_t iovlen, uint32_t flags,
void *opt_out_srcaddr,
uint32_t *opt_inout_srcaddrsize) {
if (flags & ~(_MSG_DONTWAIT | _MSG_OOB | _MSG_PEEK)) return einval();
ssize_t rc;
struct Fd *f = g_fds.p + fd;
sigset_t m = __sig_block();
rc = __winsock_block(f->handle, flags, !!(f->flags & O_NONBLOCK), f->rcvtimeo,
m, sys_recvfrom_nt_start,
bool nonblock = (f->flags & O_NONBLOCK) || (flags & _MSG_DONTWAIT);
flags &= ~_MSG_DONTWAIT;
rc = __winsock_block(f->handle, flags, nonblock, f->rcvtimeo, m,
sys_recvfrom_nt_start,
&(struct RecvFromArgs){iov, iovlen, opt_out_srcaddr,
opt_inout_srcaddrsize});
__sig_unblock(m);