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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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16
libc/sock/recv-nt.c
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@ -25,8 +25,14 @@
#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_PEEK 2
#define _MSG_WAITALL 8
#define _MSG_DONTWAIT 64
struct RecvArgs {
const struct iovec *iov;
size_t iovlen;
@ -44,11 +50,17 @@ static textwindows int sys_recv_nt_start(int64_t handle,
textwindows ssize_t sys_recv_nt(int fd, const struct iovec *iov, size_t iovlen,
uint32_t flags) {
if (flags & ~(_MSG_DONTWAIT | _MSG_OOB | _MSG_PEEK | _MSG_WAITALL)) {
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_recv_nt_start, &(struct RecvArgs){iov, iovlen});
bool nonblock = !(flags & _MSG_WAITALL) &&
((f->flags & O_NONBLOCK) || (flags & _MSG_DONTWAIT));
flags &= ~_MSG_DONTWAIT;
rc = __winsock_block(f->handle, flags, nonblock, f->rcvtimeo, m,
sys_recv_nt_start, &(struct RecvArgs){iov, iovlen});
__sig_unblock(m);
return rc;
}