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#include <atomic.h> // for LIBC_LOCK, LIBC_UNLOCK
#include <errno.h> // for EBADF, errno
#include <libc.h> // for __IMPL
#include <stdio.h> // for FILE, fileno
int fileno(FILE *stream)
{
int fd;
LIBC_LOCK(__IMPL(stream)->lock);
fd = __IMPL(stream)->fd;
LIBC_UNLOCK(__IMPL(stream)->lock);
if (fd < 0) {
errno = EBADF;
return -1;
}
return fd;
}
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