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2ec413b5a9
poll() and select() now delegate to ppoll() and pselect() for assurances
that both polyfill implementations are correct and well-tested. Poll now
polyfills XNU and BSD quirks re: the hanndling of POLLNVAL and the other
similar status flags. This change resolves a misunderstanding concerning
how select(exceptfds) is intended to map to POLPRI. We now use E2BIG for
bouncing requests that exceed the 64 handle limit on Windows. With pipes
and consoles on Windows our poll impl will now report POLLHUP correctly.
Issues with Windows path generation have been fixed. For example, it was
problematic on Windows to say: posix_spawn_file_actions_addchdir_np("/")
due to the need to un-UNC paths in some additional places. Calling fstat
on UNC style volume path handles will now work. posix_spawn now supports
simulating the opening of /dev/null and other special paths on Windows.
Cosmopolitan no longer defines epoll(). I think wepoll is a nice project
for using epoll() on Windows socket handles. However we need generalized
file descriptor support to make epoll() for Windows work well enough for
inclusion in a C library. It's also not worth having epoll() if we can't
get it to work on XNU and BSD OSes which provide different abstractions.
Even epoll() on Linux isn't that great of an abstraction since it's full
of footguns. Last time I tried to get it to be useful I had little luck.
Considering how long it took to get poll() and select() to be consistent
across platforms, we really have no business claiming to have epoll too.
While it'd be nice to have fully implemented, the only software that use
epoll() are event i/o libraries used by things like nodejs. Event i/o is
not the best paradigm for handling i/o; threads make so much more sense.
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
#ifndef COSMOPOLITAN_LIBC_CALLS_STRUCT_FD_INTERNAL_H_
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#define COSMOPOLITAN_LIBC_CALLS_STRUCT_FD_INTERNAL_H_
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#include "libc/sock/struct/sockaddr.h"
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#include "libc/thread/thread.h"
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COSMOPOLITAN_C_START_
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#define kFdEmpty 0
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#define kFdFile 1
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#define kFdSocket 2
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#define kFdConsole 4
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#define kFdSerial 5
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#define kFdZip 6
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#define kFdEpoll 7 /* epoll() deleted on 2024-09-01 */
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#define kFdReserved 8
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#define kFdDevNull 9
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#define kFdDevRandom 10
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struct CursorShared {
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pthread_mutex_t lock;
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long pointer;
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};
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struct Cursor {
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struct CursorShared *shared;
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_Atomic(int) refs;
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};
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struct Fd {
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char kind;
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bool isbound;
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unsigned flags;
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unsigned mode;
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long handle;
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int family;
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int type;
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int protocol;
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unsigned rcvtimeo; /* millis; 0 means wait forever */
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unsigned sndtimeo; /* millis; 0 means wait forever */
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void *connect_op;
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struct Cursor *cursor;
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struct sockaddr_storage peer;
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};
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struct Fds {
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_Atomic(int) f; /* lowest free slot */
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size_t n;
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struct Fd *p, *e;
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};
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struct Cursor *__cursor_new(void);
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void __cursor_ref(struct Cursor *);
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int __cursor_unref(struct Cursor *);
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void __cursor_lock(struct Cursor *);
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void __cursor_unlock(struct Cursor *);
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COSMOPOLITAN_C_END_
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#endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_FD_INTERNAL_H_ */
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