ref: c0a7fbea1f61b1d77a09d612b85c74fd6c673b7c
dir: /sys/src/ape/lib/bsd/ioctl.c/
/* posix */ #include <sys/types.h> #include <unistd.h> #include <stdlib.h> #include <stdio.h> #include <errno.h> #include <string.h> #include <fcntl.h> #include <sys/stat.h> /* bsd extensions */ #include <sys/uio.h> #include <sys/socket.h> #include <sys/ioctl.h> int ioctl(int fd, unsigned long request, void* arg) { struct stat d; if(request == FIONREAD) { if(fstat(fd, &d) < 0) { errno = EBADF; return -1; } /* this works if the file is buffered somehow */ *(long*)arg = d.st_size; return 0; } else { errno = EINVAL; return -1; } }