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761c6ad615
This change ensures that if a file descriptor for an open disk file gets shared by multiple processes within a process tree, then lseek() changes will be visible across processes, and read() / write() are synchronized. Note this only applies to Windows, because UNIX kernels already do this.
50 lines
1 KiB
C
50 lines
1 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/atomic.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
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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 Cursor {
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pthread_mutex_t lock;
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long pointer;
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};
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struct Fd {
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char kind;
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bool isdup;
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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 *shared;
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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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void __fd_lock(struct Fd *);
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void __fd_unlock(struct Fd *);
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struct Cursor *__cursor_new(void);
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COSMOPOLITAN_C_END_
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#endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_FD_INTERNAL_H_ */
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