source: azure_iot_hub/trunk/musl-1.1.18/src/stdio/fileno.c@ 388

#include "stdio_impl.h"

int fileno(FILE *f)
{
        /* f->fd never changes, but the lock must be obtained and released
         * anyway since this function cannot return while another thread
         * holds the lock. */
        FLOCK(f);
        FUNLOCK(f);
        return f->fd;
}

weak_alias(fileno, fileno_unlocked);