#include <sys/fsext.h> __FSEXT_Function *__FSEXT_get_function(int _fd);
This function is part of the section File System Extensions. It is used internal to libc.a to redirect I/O requests to the appropriate extensions.
not ANSI, not POSIX
_read(int fd, void *buf, int len) { __FSEXT_Function *func = __FSEXT_get_function(fd); if (func) { int rv; if (func(__FSEXT_read, &rv, &fd)) return rv; } /* rest of read() */ }
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