#include <io.h> int _close(int fd);
This is a direct connection to the MS-DOS close function call, int 0x21, %ah = 0x3e. This function can be hooked by the See section File System Extensions. If you don't want this, you should use See section _dos_close.
Zero if the file was closed, else nonzero.
not ANSI, not POSIX
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